hoval brochure

Technical Data

INDUSTRIAL STEAMBOILERS

THD-U E

THSD-I E

Conservation of energy, protection ofthe environment.

HovalContents

1-10 500 - 4000kg/hTHD-U E Industrial Steam Boiler for Gas and Oil Firing

Section 1

2-12 2000 - 20000kg/hTHSD-I E Industrial Steam Boiler for Gas and Oil Firing

Section 2

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THD-U EIndustrial Steam Boiler for Oil and Gas Firing

Description

Hoval

Design, Quality & Construction

The Hoval high output steam boilers

are constructed from high quality steel

and are distinguished by their solid,

robust and flexible design. The Hoval

boiler combines ease of operation and

maintenance with optimal efficiency.

The boiler is designed with all

necessary inspection doors and is

constructed for gas or oil firing.

Construction and production is

according to EN12953, the Pressure

Equipment Directive 97/23/EG and CE

marked. An independent authorised

institution carries out quality approval

at our factory. The ISO 9001

certification and internal quality control

ensures excellent performance and

longevity of service. The client receives

an economical, environmentally friendly

compact unit, supplied ready for

installation.

THD-UE Steam Boiler

The THD-UE is a three-pass flame

tube/flue gas tube boiler with

reverse flame tube and an inner fully

water-cooled reversal chamber with

finned tube wall. The boiler consists of

a cylindrical shell, two endplates,

gusset stay supports, the reverse flame

tube with finned tube wall and single

pass dimpled flue gas tubes - which

increase the heat transfer (Hoval

patent), with low gas side resistance.

The boiler is completely electrically

welded and provided with all required

inspection openings.

The spacious flame tube with low

thermal heat release results in excellent

combustion and low emissions.

Large water content and steam space

provides steady state operation.

• Efficiency of up to 89% and up to

94.5% with economiser can be

achieved.

• Standard design

pressures of

11 and 14 barg are

available. Higher

pressures can be

manufactured on

request.

Thermal Insulation

The boiler is fully

insulated with

100 mm mineral wool

insulation. The casing is made of 1mm

thick stucco aluminum plate with

neatly trimmed connections and cut-

outs. The flue gas collector is also

thermally insulated.

Valves, Fittings & Sockets

• Water level regulation and water

level control

• Water level indicator (reflex type)

• Pressure switch for pressure

regulation and supervision

• Pressure gauge

• Main steam valve

• Safety valve(s)

• Feed pump, strainer and valves

• Manual tds

• Manual double valved

blowdown/drain

Boiler assembly

2 Heavy construction boiler

base supports

1 Instrument tube placed either on

the right (standard) or on the left

1 Flue gas collector with integrated

horizontal flue gas connection,

cleaning door and integrated

relief flap

1 Boiler door for burner mounting,

thermal insulated and designed

gas proof, placed on left and

right hinges for the flue

gas side cleaning of boiler

1 Internal feed water distribution pipe

1 Data plate

1 Low water mark

1 Internal steam dryer

1 Flue gas tube cleaning kit

Control Panel

The control panel is equipped with the

required controls and indicators for

control and supervision of the boiler

and burner. Control switches, indicator

lights and alarm signals are provided.

The control panel is supplied to match

the burner to be used.

Feed Water Quality

Boiler water quality has to be

respected. Detailed information can be

found in the appendix.

Also available

- Access ladder and platform

- Second feed water pump

- Second safety valve

- Modulating feedwater control

- Automatic tds blowdown

- Water sample cooler

- Automatic timed bottom blowdown

- Removable cladding sections

- Economiser

- Customised control panel

- Remote system monitoring and

controls

- Variable speed motor controls

- Hotwell and blowdown vessels

- Termed maintenance contracts

1-1

Hoval

HovalTHD-U EIndustrial Steam Boiler for Gas and Oil Firing

Technical data

THD-U E without and with economiser 500-1500

Technical data boiler without economiser (based on 10 barg working pressure)

Model 500 650 800 1000 1200 1500

Steam rating kg/h 500 650 800 1000 1200 1500

Operating output kW 326 423 521 651 781 977

Working pressure barg 10 10 10 10 10 10

Heating surface load (nominal capacity) kg/m2 66,3 61,4 64,0 64,7 61,5 61,5

Heating surface flue gas side (complete)* m2 7,54 10,58 12,50 15,45 19,50 24,40*For heating surface water side approximately +15%

Boiler efficiency minimum % 88,0 88,0 88,0 88,0 88,0 88,0

Pressure drop flue gas side mbar 3,5 3,6 3,9 4,0 4,4 4,5

Water content operating litres 600 910 960 970 1178 1386

Water content full litres 790 1076 1240 1332 1470 1965

Model 500 650 800 1000 1200 1500

Additional output with economiser kW 24 29 32 42 47 52

Boiler efficiency with economiser % 94,0 94,0 94,0 94,0 94,0 94,0

Pressure drop flue side including economiser mbar 6,5 6,6 6,9 7,0 7,4 7,5

Flue gas temperature after economiser °C 140 140 140 140 140 140

1-2

Technical data boiler with economiser (based on 10 barg working pressure)

Model 500 650 800 1000 1200 1500

Oil calorific value kJ/kg 42,700 42,700 42,700 42,700 42,700 42,700

Fuel consumption at full capacity kg/h 31 40 50 62 75 93

Wet flue gas volume at 2,7% O2 Nm3/h 433 550 677 846 1016 1269

Dry flue gas volume at 3% O2 Nm3/h 390 495 610 762 914 1143

Fuel heat input without economiser kW 377 479 591 736 882 1102

Fuel heat input with economiser kW 347 451 555 694 833 1041

Flue gas temperature °C 140 140 140 140 140 140

Technical data Diesel Oil (35 secs)

Model 500 650 800 1000 1200 1500

Natural gas calorific value kJ/Nm3 36,000 36,000 36,000 36,000 36,000 36,000

Fuel consumption at full capacity Nm3/h 35 45 56 69 83 104

Wet flue gas volume at 2,4% O2 Nm3/h 431 547 673 842 1010 1262

Dry flue gas volume at 3% O2 Nm3/h 368 467 575 719 863 1079

Fuel heat input without economiser kW 377 479 590 737 888 1110

Fuel heat input with economiser kW 347 451 555 694 833 1041

Flue gas temperature °C 140 140 140 140 140 140

Technical data Natural gas

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HovalTHD-U EIndustrial Steam Boiler for Oil and Gas Firing

Technical data

THD-U E without and with economiser 2000-4000

Technical data boiler without economiser (based on 10 barg working pressure)

Model 2000 2500 3000 3500 4000

Steam rating kg/h 2000 2500 3000 3500 4000

Output kW 1303 1628 1953 2279 2605

Working pressure barg 10 10 10 10 10

Heating surface load (nominal capacity) kg/m2 63,0 58,2 57,6 58,8 58,9

Heating surface flue gas side (complete)* m2 31,74 42,93 52,10 59,50 67,90*For heating surface water side approximately +15%

Boiler efficiency minimum % 88,0 88,0 88,0 88,0 88,0

Pressure drop flue gas side mbar 5,2 5,3 5,8 6,1 6,8

Water content operating litres 2000 2575 2894 3240 3540

Water content full litres 2550 3500 3840 4270 4525

Model 2000 2500 3000 3500 4000

Additional output with economiser kW 69 82 105 134 165

Boiler efficiency with economiser % 94,0 94,0 94,0 94,0 94,0

Pressure drop flue side mbar 8,2 8,3 8,8 9,1 9,8

Flue gas temperature after economiser °C 140 140 140 140 140

Technical data boiler with economiser (based on 10 barg working pressure)

Model 2000 2500 3000 3500 4000

Oil EL calorific value kJ/kg 42,700 42,700 42,700 42,700 42,700

Fuel consumption at full capacity kg/h 124 155 186 217 249

Wet flue gas volume at 2,7% O2 Nm3/h 1693 2116 2539 2962 3385

Dry flue gas volume at 3% O2 Nm3/h 1524 1905 2286 2667 3048

Fuel heat input without economiser kW 1473 1846 2211 2580 2948

Fuel heat input with economiser kW 1388 1735 2082 2428 2776

Flue gas temperature °C 140 140 140 140 140


Model 2000 2500 3000 3500 4000

Natural gas calorific value kJ/Nm3 36,000 36,000 36,000 36,000 36,000

Fuel consumption at full capacity Nm3/h 138 184 208 243 278

Wet flue gas volume at 2,4% O2 Nm3/h 1683 2104 2552 2946 3366

Dry flue gas volume at 3% O2 Nm3/h 1483 1798 2157 2517 2876

Fuel heat input without economiser kW 1476 1843 2211 2580 2948

Fuel heat input with economiser kW 1388 1735 2082 2429 2776

Flue gas temperature °C 140 140 140 140 140

Technical data fuel Natural gas

1-3


Technical data

THD-U E 500-4000

Dimensions and weights

1-4

Model 500 650 800 1000 1200 1500

Boiler length with insulation, without burner mm 2260 2460 2560 2760 2760 3340

Boiler length with Eco and insulation, mm 3300 3500 3550 3700 3700 4280

without burner

Boiler width with insulation, with pump mm 1760 1850 1950 1950 2030 2050

Boiler height with insulation, with fittings mm 1870 1960 2060 2060 2140 2160

Insulation thickness mm 100 100 100 100 100 100

Flue gas outlet diameter1 mm 200 200 250 300 300 300

Minimum draft tube length mm 350 350 350 350 350 350

Transport weight at 10 bar kg 2100 2300 2600 2900 3200 3400

Operating weight flooded at 10 bar kg 3100 3500 4200 4600 5000 5800

Manhole size mm 420x320 420x320 420x320 420x320 420x320 420x320

quantity no. 1 1 1 1 1 1

Inspection port size mm 80 80 80 80 80 80

quantity no. 2 2 2 2 2 2

Model 2000 2500 3000 3500 4000

Boiler length with insulation, with burner mm 3810 3910 3910 4210 4410

Boiler length with Eco and insulation, mm 4900 4900 4900 5200 5400

without burner

Boiler width with insulation, with pump mm 2100 2350 2500 2550 2550

Boiler height with insulation, with fittings mm 2210 2460 2560 2640 2640

Insulation thickness mm 100 100 100 100 100

Flue gas outlet diameter1 mm 350 450 450 450 450

Minimum draft tube length mm 350 350 350 350 350

Transport weight at 10 bar kg 4000 5000 6000 7000 8000

Operating weight flooded at 10 bar kg 6500 8900 10400 12000 13400

Manhole size mm 420x320 420x320 420x320 420x320 420x320

quantity no. 1 1 1 1 1

Inspection port size mm 80 80 80 80 80

quantity no. 2 2 2 2 2

1 Ducting and chimney diameters to be sized for site application.

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Hoval

1-5

Flame Tube View

Fin

Tube

Reverse Flame Tube

THD-U EIndustrial Steam Boiler for Gas and Oil Firing

Design features

Three Pass Reverse Design

Fin Tube Wall


Dimensions

THD-U E without economiser

1 Boiler

2 Boiler base

3 Hinged front door

4 Flue gas outlet

5 Explosion/cleaning door (flue side)

6 Inspection opening (waterside)

7 Instrument assembly

8 tds shut off valve

9 Steam shut off valve

10 Safety valve(s)

11 Water level gauges

12 Water level control

13 Water level alarms

14 Feed water inlet pipework

15 Feed water valve(s)1

16 Bottom blow down ball valve

17 Pressure stats

18 Feed water pump(s)1

19 Electrical control panel

20 Burner2

21 Flame viewing point

L

2260

2460

2560

2760

2760

3340

3810

3910

3910

4210

4410

B

1760

1850

1950

1950

2030

2050

2100

2350

2500

2550

2550

B2

1625

1675

1775

1775

1875

1875

1975

2075

2225

2225

2225

B3

1460

1550

1650

1650

1730

1750

1800

2050

2150

2200

2200

H

1870

1960

2060

2060

2140

2160

2210

2460

2560

2640

2640

H2

805

850

900

900

940

950

975

1100

1150

1175

1175

H4

673

700

735

735

760

770

771

877

882

945

945

D

1210

1300

1400

1400

1480

1500

1550

1800

1900

1950

1950

L1

1300

1500

1500

1500

1500

2200

2500

2500

2500

2800

3000

B1

850

900

1000

1000

1100

1100

1200

1300

1450

1450

1450

H1

1470

1560

1660

1660

1740

1760

1810

2060

2160

2210

2210

D1

200

200

250

300

300

300

350

450

450

450

450

THD-U EModel

500

650

800

1000

1200

1500

2000

2500

3000

3500

4000

Main dimensions Boiler base Flue gasconnection3

1 Optional 2nd feed water pump.2 Burner shown is monoblock type.3 Ducting and chimney diameters to be sized for site application.

Dimensions incl. 100 mm insulation thickness.

Transport dimensions for pressure level 11 bar.

Design pressure 11 and 14 bar (overpressure).

Higher pressures available on request.

1-6

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Hoval

1-7


Technical data

THD-U E with economiser

1 Boiler

2 Boiler base

3 Hinged front door

4 Flue gas outlet


6 Inspection opening (waterside)




10 Safety valve(s)





15 Feed water valve(s)1


17 Pressure stats

18 Feed water pump(s)1


20 Burner2

21 Flame viewing point

22 Economiser4

L

3300

3500

3550

3700

3700

4280

4900

4900

4900

5200

5400

B

1760

1850

1950

1950

2030

2050

2100

2350

2500

2550

2550

B2

1625

1675

1775

1775

1875

1875

1975

2075

2225

2225

2225

B3

1460

1550

1650

1650

1730

1750

1800

2050

2150

2200

2200

H

1870

1960

2060

2060

2140

2160

2210

2460

2560

2640

2640

H1

1470

1560

1660

1660

1740

1760

1810

2060

2160

2210

2210

H2

805

850

900

900

940

950

975

1100

1150

1175

1175

H4

673

700

735

735

760

770

771

877

882

945

945

D

1210

1300

1400

1400

1480

1500

1550

1800

1900

1950

1950

L1

1300

1500

1500

1500

1500

2200

2500

2500

2500

2800

3000

B1

850

900

1000

1000

1100

1100

1200

1300

1450

1450

1450

H3

805

850

900

900

940

950

975

1100

1150

1175

1175

D1

200

200

250

300

300

300

350

450

450

450

450

THD-U EModel

500

650

800

1000

1200

1500

2000

2500

3000

3500

4000


1 Optional 2nd feed water pump.2 Burner shown is monoblock type.3 Ducting and chimney diameters to be sized for site application.4 Economiser can be positioned vertically.

Dimensions incl. 100 mm insulation thickness.


*Add 100mm to H1 for crane hooks.

Design pressure 11 and 14 bar (overpressure).

Higher pressures available on request.

Hoval

1-8

To facilitate installation andmaintenance the stated clearancesshould be met. Drawing indicates righthand (standard) hinged door.

Minimal space refers to boiler.Depending on equipment (accessories)the minimal space needs to bereviewed according to local codes.

Positioning

- No air pollution throughhalogenated hydrocarbon(contained e.g. sprays, paints, solvents and cleaners)

- No large amounts of dust- No high atmospheric humidity- Frost-resistant and well ventilated- Boiler to be installed and

positioned in a weatherproof, non-hazardous and safe classified area.

Otherwise damage to the installationmay occur.

The boiler may only be installed inrooms where air pollution throughhalogenated hydrocarbon can occur ifsufficient measures are taken ensuringthe supply of unpolluted combustionair.

Boiler room dimensions can bereduced by the fitting of a shutter dooror knockout panel.

Model

THD-U E a (mm)

500

1850

650

2050

800

2050

1000

2050

1200

2050

1500

2750

2000

3050

2500

3050

Model

THD-U E a (mm)

3000

3050

3500

3350

4000

3550

*300mm+ burner overall length (consider pivoting range/pivoting side)**Consider control panel, pump(s) assembly***Flame tube length for tube witdrawal and cleaning


Technical data

Installation

a ***

* 1200Minimum

** 1200Minimum

500 Minimum

500 Minimum

Hoval

1-9


Engineering

Rules and regulations

The following rules and regulations

have to be respected:

- Hoval technical information and

installation guide

- Fire protection regulations

- National regulations concerning

permission, installation and operation of

boiler appliances. Boiler appliances

have to be installed according to

national laws and regulations and

accessory requirements.

- Besides the national and local

regulations the project specific

circumstances of the boiler supplier

have to be considered for every

application.

Water treatment/water quality

- The quality of the boiler water has to be

guaranteed according to Hoval technical

information and national guidelines.

- Hoval boilers may only be operated with

treated water. The national regulations

for the treatment of water apply for the

values to be maintained.

- Required water quality: see page 1-10.

- The water quality has to be checked

daily.

Planning, operation and

maintenance

- The heating of the feed water and the

degassing takes place in the feed water

tank (hot well).

- To increase the efficiency, especially for

natural gas operation, an economiser

can be added to pre-heat the feed

water.

- Pumps (especially horizontal rotary

pumps and warm water/condensate

pumps, NPSH pumps) need to be

installed with the necessary flow and

return pipework according to

requirements. The installation has to be

completely free of tension (anti-

vibration proof).

- Feedwater tank height must satisfy the

feed pump NPSH requirement.

- National and local rules and regulations

have to be considered for the fuel

supply. Fuel filters are highly

recommended

- The operation and water analysis data

is to be recorded daily in the operation

booklet.

- Safety valve, condensate and blowdown

connections must discharge to a safe

place.

- Filters and strainers have to be cleaned

periodically, especially if installed in

front of control devices.

- The drain of the tds, blow down,

drainage, etc has to be safely

discharged into a blowdown vessel.

- All heating components and pipework

are to be insulated in order to reduce

radiation losses.

Combustion air

- The supply of combustion air must be

guaranteed for a safe and economic

operation. There must be no possibility

of the air supply being shut off.

- Ventilation of the boiler house has to

also be provided.

- In the installation room no negative

pressure larger than 3 N/m2 is allowed.

To adhere to this demand, plan a free

area for the air supply opening of at

least 200 cm2, plus 2 cm2 per KW

output. The aspect ratio for rectangular

openings should not be more than 1.5 :1.

If the opening is louvered ensure

the free area is sufficient. National laws

have to be respected.

- Boiler houses have to be fitted with

relevant fresh air supply openings or

ducted system.

- Gas boilers are not to be installed in

rooms where halogen compounds occur

which can enter the combustion air.

Noise level reduction

The following measures for noise level

reduction are possible:

- Solid construction of boiler room

walls, ceiling and floor, installation

of silencer in fresh air supply, noise

insulation for support and bracket

of pipes.

- Installation of acoustic shroud for

the burner.

- A substantial part of the sound caused

in the combustion chamber and in the

top heating surfaces is radiated from

the flue outlet as sound transmitted by

air. In addition to this, resonance

features, depending on chimney

dimensioning and inlet, may occur

which are triggered by the oscillation of

the combustion process. These sounds

can be reduced by burner-lateral

measures, e.g. changes of flame

geometry, atomisation characteristics or

fuel throughput.

- Flue gas attenuators cause a substantial

sound level reduction. These should

usually be tuned at low frequencies of

60 - 250 Hz. Flue gas attenuators

function according to the principle of

sound absorption. The kinetic energy of

the exhaust gases is reduced by friction

requiring an increase in chimney draft in

the flue system. This has to be

considered for burner sizing. The

connection piece from the boiler to the

flue gas sound absorber has to be

gastight.

- The necessary space requirement of

approximately 1 m for the later

installation of a flue gas attenuator

should already be included when

planning.

Chimney/flue gas system

- A properly designed chimney/flue

arrangement must be provided to

match each particular application.

- To achieve a smooth discharge of the

exhaust gases from the boiler into the

chimney, the flue connection is

recommended to enter the chimney at

approximately 30-45°.

- From a length of greater than 1 m

thermal insulation is necessary.

- Adequate provision should be made to

drain off condensate from the base of

the chimney ensuring condensate does

not run back into the boiler smokebox.

Hoval

1-10


Boiler and feed water specifications for steam boiler plants

Feed water specifications for natural circulating boilers

Boiler water specifications for natural circulating boilers

Working pressure bar <1 >1 < 22 >22 < 68

Properties colourless, clear, free from suspended matter and foam

pH-value at 25°C > 9 > 9 >9

Sum of alkaline earth elements (Ca + Mg)1 mmol/l < 0,02 < 0,02 < 0,01

°dH < 0,112 < 0,112 < 0,056

Conductivity at 25°C µS/cm see guidelines for boiler water specifications only

Oxygen (O2) mg/l < 0,1 < 0,02 < 0,02

Carbon dioxide (CO2) dissolved mg/l < 25 < 25 < 25

Iron (Fe), total mg/l - < 0,05 < 0,03

Copper (Cu), total mg/l - < 0,01 0,005

Silicate acid (SiO2) mg/l see guidelines for boiler water only

Consumption of Potassium permanganate mg/l < 10 < 10 < 10

Oil, fat mg/l < 3 < 1 < 1

1 Noted in the past at °dH, changing factor: 1 mmol/l = 5,6 °dH (German hardness).

It is not necessary to make continuous control of the following parameters: Conductivity, Oxygen (O2), Carbon dioxide (CO2)

dissolved, Iron (Fe), total, Copper (Cu), total, Silicate (SiO2), Consumption of Potassium permanganate, Oil, fat.



pH-value at 25°C 10,5-12 10,5-12 10-11,8


°dH < 0,112 < 0,112 < 0,056

Conductivity at 25°C µS/cm < 5000* < 5000* < 2000*

Acid capacity KS 8,23 (p-value) mmol/l 1-12 1-12 0,5-6


Iron (Fe), total mg/l - < 0,05 < 0,03

Silicate acid (SiO2) mg/l < 150 < 100 < 50

Phosphate (P2O4)4 mg/l 10-20 5-10 5-10

Sodium sulphate (Na2SO3)4 mg/l 5-10 5-10 3-5

(Polyamide)5 mg/l (3-5) (3-5) --

1 Take care to maintain the allowed value of acid capacity - at this point the allowed conductivity has to be lower on many

plants; for water level electrodes minimum conductivity > 5 µS/cm2 Noted in the past at °dH, changing factor: 1 mmol/l = 5,6 °dH (German hardness)3 Noted in the past as p-value, changing factor: KS 8,2 = 1 according p-value = 14 Measurements only necessary if dosing chemicals are used which contains these values5 It is recommended to use Amine (film producing) only instead of other dosing chemicals for boilers which have a small

heating load and up to maximum 16 bar working pressure. Because of the danger of foam production overdosing is not

permitted!

Boiler water quality to comply with BS2486.It is not necessary to make continuous control of the following parameters: Silicate (SiO2)

Important note: Hoval recommend that a water treatment specialist is employed to advise on each application and to carry

out routine monitoring of the feed and boiler water to ensure it remains within specification.

Hoval

1-11

Industrial steam and hot water boilers

Boiler plant total supply package

Hoval can design and supply all components for the boiler plant room including in-house manufacture of the

Steam or Hot Water Boiler, Hotwells (Feedwater Tanks), Blowdown Vessels, Deaerators and Economisers

where appropriate.

HovalIndustrial steam and hot water boilers

Design of steam boiler plant

1-12

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ION

THSD-I EIndustrial Steam Boiler for Gas and Oil Firing

Description

Hoval

Design, Quality & Construction

The Hoval high output steam boilers

are constructed from high quality steel

and are distinguished by their solid,

robust and flexible design. The Hoval

boiler combines ease of operation and

maintenance with optimal efficiency.

The boiler is designed with all

necessary inspection doors and is

constructed for gas or oil firing.

Construction and production is

according to EN12593, the Pressure

Equipment Directive 97/23/EG and CE

marked. An independent authorised

institution carries out quality approval

at our factory. The ISO 9001

certification and internal quality control

ensures excellent performance and

longevity of service. The client receives

an economical, environmentally friendly

compact unit, supplied ready for

installation

THSD-IE Steam Boiler

The THSD-IE is a three-pass flame

tube/flue gas tube boiler with

an inner fully water-cooled reversal

chamber with finned tube wall. The

boiler consists of a cylindrical shell, two

endplates, gusset stay supports, flame

tube, gas reversal chamber with

water cooled finned tube wall and two

tube bank gas passes with low gas

side resistance. The boiler is

completely electrically welded and

provided with all required inspection

openings.

The spacious flame tube with low

thermal heat release results in excellent

combustion and low emissions.

Large water content and steam space

provides steady state operation.

• Efficiency of up to 91% and up to

95% with economiser can be

achieved.

• Standard design

pressures of

10,13,16 and 20 barg

are available. Higher

pressures can be

manufactured on

request.

Thermal Insulation

The boiler is fully

insulated with

120 mm mineral wool

insulation. The casing is made of 1mm

thick stucco aluminum plate with neatly

trimmed connections and cut-outs. The

flue gas collector is also thermally

insulated.

Valves, Fittings & Sockets

• Water level regulation and water

level control

• Water level indicator (reflex type)

• Pressure switch for pressure

regulation and supervision

• Pressure gauge

• Main steam valve

• Safety valve(s)

• Feed pump, strainer and valves

• Manual tds

• Manual-double valve

blowdown/drain

Boiler assembly

2 Heavy construction boiler

base supports

1 Instrument tube placed either on

the right (standard) or on the left

1 Flue gas collector with integrated

horizontal flue gas connection,

cleaning door and integrated

relief flap

1 Boiler door for burner mounting,

thermal insulated and designed

gas proof, placed on left and

right hinges for the flue

gas side cleaning of boiler

1 Internal feed water distribution pipe

1 Data plate

1 Low water mark

1 Internal steam dryer

1 Flue gas tube cleaning kit

Control Panel

The control panel is equipped with the

required controls and indicators for

control and supervision of the boiler

and burner. Control switches, indicator

lights and alarm signals are provided.

The control panel is supplied to match

the burner to be used.

Feed Water Quality

Boiler water quality has to be

respected. Detailed information can be

found in the appendix.

Also available

- Access ladder and platform

- Second feed water pump

- Second safety valve

- Modulating feedwater control

- Automatic tds blowdown

- Water sample cooler

- Automatic timed bottom blowdown

- Removable cladding sections

- Economiser

- Customised control panel

- Remote system monitoring and

controls

- Variable speed motor controls

- Hotwell and blowdown vessels

- Termed maintenance contracts

2-1

HovalTHSD-I EIndustrial Steam Boiler for Gas and Oil Firing

Technical data

THSD-I E 2000-8000

Technical data without economiser

Model 2000 2500 3000 4000 5000 6000 8000

Steam output kg/h 2000 2500 3000 4000 5000 6000 8000Operating output at 10 barg kW 1304 1630 1956 2608 3260 3912 5216

at 13 barg kW 1308 1635 1963 2617 3271 3925 5234at 16 barg kW 1311 1639 1967 2623 3278 3934 5246

Boiler efficiency Natural gas at 10 barg % 89,8 90,0 89,7 89,9 90,2 90,4 89,7at 13 barg % 89,3 89,5 89,2 89,4 89,7 90,0 89,2at 16 barg % 89,0 89,1 89,9 89,0 89,3 89,5 89,0

Boiler efficiency at 10 barg % 90,2 90,1 89,8 89,9 90,2 90,4 89,7Diesel Oil (35 secs) at 13 barg % 89,7 89,6 89,3 89,4 89,7 90,0 89,2

at 16 barg % 89,3 89,2 89,0 89,0 89,3 89,5 89,0

Flue gas resistance mbar 9,0 9,0 10,0 10,0 10,0 10,0 10,0

Model 2000 2500 3000 4000 5000 6000 8000

Additional operating output at 10 barg kW 62 79 102 131 154 175 272with economiser at 13 barg kW 68 88 116 144 171 194 299

at 16 barg kW 74 95 120 156 186 213 315

Boiler efficiency with economiser % 94,4 94,4 94,4 94,4 94,4 94,4 94,4Flue gas resistance of economiser mbar 2.5 2.5 2.5 2.5 2.5 2.5 2.5

Flue gas temperature after economiser °C 140 140 140 140 140 140 140

Technical data with integral economiser, fuel natural gas and low sulphur fuel oil

2-2

Model 2000 2500 3000 4000 5000 6000 8000

Natural gas calorific value kJ/Nm3 36000 36000 36000 36000 36000 36000 36000

Fuel consumption at at 10 barg Nm3/h 145,3 181,1 220,7 290,3 361,7 432,9 581,9full capacity at 13 barg Nm3/h 146,7 182,7 222,7 292,9 364,9 436,5 587,1

at 16 barg Nm3/h 147,7 184,0 224,2 294,9 367,5 439,8 583,6

Flue gas volume, at 10 barg Nm3/h 1688 2018 2458 3234 4030 4822 6482excess air @10% at 13 barg Nm3/h 1701 2036 2481 3263 4066 4863 6540

at 16 barg Nm3/h 1414 2050 2498 3285 4094 4899 6501

Fuel heat input at 10 barg kW 1453 1811 2181 2902 3614 4327 5815at 13 barg kW 1465 1826 2201 2928 3647 4361 5868at 16 barg kW 1476 1839 2215 2948 3671 4396 5901

Technical data Natural Gas

Model 2000 2500 3000 4000 5000 6000 8000

Diesel Oil calorific value kJ/kg 42700 42700 42700 42700 42700 42700 42700

Fuel consumption at at 10 barg kg/h 121,9 152,6 183,8 244,6 304,9 364,9 490,3full capacity at 13 barg kg/h 123,0 154,0 185,4 246,8 307,6 368,0 494,7

at 16 barg kg/h 123,9 155,1 186,7 284,5 309,8 370,8 491,8

Flue gas volume, at 10 barg Nm3/h 1647 2061 2482 3304 4117 4928 6621excess air @12% at 13 barg Nm3/h 1661 2080 2504 3333 4154 4970 6680

at 16 barg Nm3/h 1673 2094 2522 3365 4183 5007 6641

Fuel heat input at 10 barg kW 1446 1810 2179 2900 3614 4327 5815at 13 barg kW 1458 1825 2199 2926 3647 4361 5868at 16 barg kW 1468 1838 2213 2947 3671 4396 5894



Technical data

THSD-I E 10000-20000

Technical data without economiser

Model 10000 12000 14000 16000 18000 20000

Steam rating kg/h 10000 12000 14000 16000 18000 20000Operating output at 10 barg kW 6520 7824 9128 10432 11736 13040

at 13 barg kW 6542 7850 9159 10467 11776 13084at 16 barg kW 6557 7868 9180 10491 11802 13114

Boiler efficiency Natural gas at 10 barg % 89,9 89,8 89,8 89,9 89,6 89,9at 13 barg % 89,4 89,5 89,4 89,4 89,2 89,4at 16 barg % 89,2 89,1 89,0 89,0 89,0 89,0

Boiler efficiency at 10 barg % 89,9 89,89 89,9 89,8 89,7 89,9Diesel Oil (35 secs) at 13 barg % 89,4 89,5 89,5 89,5 89,2 89,4

at 16 barg % 89,1 89,0 89,0 89,0 89,0 89,0

Flue gas resistance mbar 11,0 10,0 10,0 10,0 11,0 11,0

Model 10000 12000 14000 16000 18000 20000

Additional operating output at 10 barg kW 326 399 465 522 622 652with economiser at 13 barg kW 366 432 513 586 686 732

at 16 barg kW 382 464 557 637 716 796

Boiler efficiency with economiser % 94,4 94,4 94,4 94,4 94,4 94,4Flue gas resistance of economiser mbar 2,5 2,5 2,5 3,0 3,0 3,0

Flue gas temperature after economiser °C 140 140 140 140 140 140

Technical data with integral economiser, fuel natural gas and low sulphur fuel oil

2-3

Model 10000 12000 14000 16000 18000 20000

Natural gas calorific value kJ/Nm3 36000 36000 36000 36000 36000 36000

Fuel consumption related at 10 barg Nm3/h 725,7 871,4 1016,7 1162,1 1310,0 1451,5at 13 barg Nm3/h 732,2 877,4 1024,6 1171,1 1320,1 1464,5at 16 barg Nm3/h 728,0 883,6 1031,7 1179,3 1329,4 1474,7

Flue gas volume, at 10 barg Nm3/h 8084 9707 11327 12946 14594 16170excess air @10% at 13 barg Nm3/h 8156 9774 11414 13046 14706 16315

at 16 barg Nm3/h 8110 9843 11494 13137 14809 16429

Fuel heat input at 10 barg kW 7253 8713 10165 11604 13098 14505at 13 barg kW 7318 8771 10245 11708 13020 14635at 16 barg kW 7351 8831 10315 11788 13291 14735

Technical data Natural Gas

Model 10000 12000 14000 16000 18000 20000

Diesel Oil calorific value kJ/kg 42700 42700 42700 42700 42700 42700

Fuel consumption related at 10 barg kg/h 611,5 734,3 856,8 979,3 1103,8 1223,2at 13 barg kg/h 617,0 739,5 863,5 987,0 1112,4 1234,2at 16 barg kg/h 613,6 744,7 869,7 994,0 1120,3 1245,9

Flue gas volume, at 10 barg Nm3/h 8259 9916 11571 13226 14907 16520excess air @12% at 13 barg Nm3/h 8333 9987 11662 13329 15023 16667

at 16 barg Nm3/h 8287 10057 11745 13424 15129 16756

Fuel heat input at 10 barg kW 7253 8703 10154 11617 13084 14505at 13 barg kW 7318 8771 10234 11695 13202 14635at 16 barg kW 7359 8860 10338 11788 13291 14735



Technical data

THSD-I E 2000-8000


2-4

Model 2000 2500 3000 4000 5000 6000 8000

Boiler length with insulation, without burner,

without economiser mm 3750 3950 4150 4500 4950 5150 5650

Boiler length with economiser,

without insulation, without burner mm 4700 4900 5100 5450 5900 6100 6600

Boiler width with insulation, with pump mm 2450 2550 2600 2700 2800 2900 3100

Boiler height with insulation, with fittings mm 2700 2800 2850 3075 3250 3400 3650

Insulation thickness mm 120 120 120 120 120 120 120

Flue gas outlet diameter (ducting, and mm 350 450 450 550 550 650 650

chimney diameters to be sized for site application

Heating surface flue gas side (complete)* m2 47,4 57,3 65,9 88,4 108,3 129,2 169,7

*For heating surface water side approximately +15%

Water content operating litres 2750 4350 4850 5850 7200 8200 10000

flooded litres 4600 5450 6000 7250 9000 10300 12500

Transport weight without at 10 barg kg 5000 6000 7000 8000 9500 11000 14500

burner and without Economiser at 13 barg kg 5500 6500 7500 8500 10500 12000 15500

including accessories at 16 barg kg 6000 7000 8000 9500 11500 13500 16500

Manhole (size) mm 420 x 420 x 420 x 420 x 420 x 420 x 420 x

320 320 320 320 320 320 320

(quantity) 1 1 1 1 1 1 1

Inspection opening (size) mm 220 x 220 x 220 x 220 x 220 x 220 x 220 x

150 150 150 150 150 150 150

(quantity) 2 2 2 2 2 2 2

Design features

Three Pass Conventional Design

Flame Tube


Technical data

THSD-I E 10000-20000


Model 10000 12000 14000 16000 18000 20000

Boiler length with insulation, without burner,

without economiser mm 6150 6550 6850 7150 7350 7850

Boiler length with economiser,

without insulation, without burner mm 7050 7450 7750 8050 8250 8750

Boiler width with insulation, with pump mm 3300 3400 3600 3700 3800 3900

Boiler height with insulation, with fittings mm 3925 4125 4350 4425 4625 4725

Insulation thickness mm 120 120 120 120 120 120

Flue gas outlet diameter mm 800 850 950 1000 1000 1000

chimney diameters to be sized for site application

Heating surface flue gas side (complete)* m2 211,8 284,5 324,9 381,3 410,7 467,6

*For heating surface water side approximately +15%

Water content operating litres 14200 15900 17600 20000 23000 24250

flooded litres 18000 20350 22700 25000 29200 31400

Transport weight without at 10 barg kg 17500 21500 25000 28000 30000 33000

burner and without Economiser at 13 barg kg 18500 21500 26000 29000 31000 35000

including accessories at 16 barg kg 19500 24000 28000 31000 35000 39000

Manhole (size) mm 420 x 420 x 420 x 420 x 420 x 420 x

320 320 320 320 320 320

(quantity) 1 1 1 1 1 1

Inspection opening (size) mm 220 x 220 x 220 x 220 x 220 x 220 x

150 150 150 150 150 150

(quantity) 2 2 2 2 2 2

2-5

Construction View

Mounting of the Fin

tube wall

Second pass

Third pass

Hoval

Model 2000 2500 3000 4000 5000 6000 8000

1 Flue gas tube cleaning equipment YES YES YES YES YES YES YES

1 Main steam valve 10 barg DN80 DN80 DN100 DN100 DN100 DN125 DN15013 barg DN65 DN80 DN80 DN100 DN100 DN100 DN12516 barg DN65 DN65 DN80 DN80 DN100 DN100 DN125

1 Vent valve DN25 DN25 DN25 DN25 DN25 DN25 DN25

2 Safety valves* 10 barg DN25/40 DN25/40 DN32/50 DN32/50 DN32/50 DN40/65 DN40/6513 barg DN25/40 DN25/40 DN25/40 DN32/50 DN32/50 DN32/50 DN40/6516 barg DN25/40 DN25/40 DN25/40 DN25/40 DN32/50 DN32/50 DN32/50

2 Isolation valves DN20 DN20 DN20 DN20 DN20 DN20 DN20

2 Reflection indicators fixing centre (mm) 420 420 420 420 420 420 420

1 Blow down sight glass drain (screwed) 1/2" 1/2" 1/2" 1/2" 1/2" 1/2" 1/2"

1 Desalting shut off valve DN15 DN15 DN15 DN15 DN15 DN15 DN15

1 Blow down shut off valve DN40 DN40 DN40 DN40 DN40 DN40 DN40

1 Blow down ball valve DN40 DN40 DN40 DN40 DN40 DN40 DN40

1 Pressure gauge with three-way valve (screwed) 1/2" 1/2" 1/2" 1/2" 1/2" 1/2" 1/2"

Water level control type

1 Feed water valve DN25 DN32 DN32 DN32 DN40 DN40 DN50

1 Feed water non-return valve/anti syphon valve DN25 DN32 DN32 DN32 DN40 DN40 DN50

1 Strainer pump (suction side) DN40 DN50 DN50 DN50 DN65 DN65 DN80

1 Ball valve pump (suction side) DN40 DN50 DN50 DN50 DN65 DN65 DN80

1 Pressure gauge (pump) withshut off valve (screwed) 1/4" 1/4" 1/4" 1/4" 1/4" 1/4" 1/4"

1 Feed water pump 10 barg CR CR CR CR CR CR CRMotor rating kW 2.2 2.2 3.0 4.0 4.0 5.5 5.5



*Safety valve number and size to be advised at contract stage subject to set pressure requirement.


Technical data

THSD-I E 2000-8000

Fittings

2-6

ON/OFF


Technical data

THSD-I E 10000-20000

Fittings

Model 10000 12000 14000 16000 18000 20000

1 Flue gas tube cleaning equipment YES YES YES YES YES YES

1 Main steam valve 10 barg DN150 DN200 DN200 DN200 DN200 DN250

13 barg DN150 DN150 DN200 DN200 DN200 DN200

16 barg DN125 DN150 DN150 DN150 DN200 DN200

1 Vent valve DN25 DN25 DN25 DN25 DN25 DN25

2 Safety valve* 10 barg DN50/80 DN50/80 DN65/100 DN65/100 DN65/100 DN65/100

13 barg DN40/65 DN50/80 DN50/80 DN65/100 DN65/100 DN65/100

16 barg DN40/65 DN40/65 DN50/80 DN50/80 DN50/80 DN65/100

2 Isolation valve DN20 DN20 DN20 DN20 DN20 DN20

2 Reflection indicators fixing centre (mm) M=420 M=420 M=420 M=420 M=420 M=420

1 Blow down sight glass drain (screwed) 1/2" 1/2" 1/2" 1/2" 1/2" 1/2"

1 tds shut off valve DN15 DN15 DN15 DN15 DN15 DN15

1 Blow down shut off valve DN40 DN40 DN40 DN40 DN40 DN40

1 Blow down ball valve DN40 DN40 DN40 DN40 DN40 DN40

1 Pressure gauge with three-way valve 1/2" 1/2" 1/2" 1/2" 1/2" 1/2"

Water level control type

1 Feed water valve DN50 DN50 DN65 DN80 DN80 DN80

1 Feed water non-return valve/anti syphon valve DN50 DN50 DN65 DN80 DN80 DN80

1 Strainer pump (suction side) DN80 DN80 DN100 DN125 DN125 DN125

1 Ball valve pump (suction side) DN 80 DN 80 DN100 DN125 DN125 DN125

1 Pressure gauge (pump) with shut off valve 1/4" 1/4" 1/4" 1/4" 1/4" 1/4"

1 Feed water pump 10 barg CR CR CR CR CR CR

Motor rating kW 11.0 11.0 11.0 11.0 15.0 15.0


Motor rating kW 11.0 11.0 15.0 15.0 18.5 18.5


Motor rating kW 15.0 15.0 18.5 18.5 18.5 22.0

*Safety valve number and size to be advised at contract stage subject to set pressure requirement.

2-7

MODULATING


Technical data

THSD-I E without economiser

1 Boiler

2 Boiler base

3 Front reversal chamber

Hinged front door

4 Flue gas outlet


6 Inspection openings (water side)




10 Safety valve(s)




14 Feed water inlet

15 Feed water valve(s)


17 Pressure stats

18 Feed water pump(s)


20 Burner5

21 Vent valve

22 Condensate drainage

23 Flame viewing port

L

3750

3950

4150

4500

4950

5150

5650

6150

6550

6850

7150

7350

7850

B

2450

2550

2600

2700

2800

2900

3100

3300

3400

3600

3700

3800

3900

H

2700

2800

2850

3075

3250

3400

3650

3925

4125

4350

4425

4625

4725

H1

2250

2350

2400

2550

2650

2800

2925

3200

3300

3500

3600

3700

3800

H2

1175

1225

1250

1350

1400

1450

1550

1700

1750

1850

1900

1950

2000

D

1990

2090

2140

2240

2340

2440

2640

2840

2940

3140

3240

3340

3440

L3

300

300

300

300

300

300

300

350

350

350

350

350

350

L4

700

700

700

700

700

700

700

850

850

850

850

850

850

L1

2300

2500

2700

3000

3400

3600

4100

4500

5000

5000

5500

5500

6000

L2

400

400

400

400

400

400

400

475

475

475

475

475

475

B1

1175

1225

1250

1350

1400

1450

1550

1700

1750

1850

1900

1950

2000

B2

160

160

160

160

160

160

160

200

200

200

200

200

200

H3

1750

1825

1850

1950

2000

2100

2200

2350

2400

2500

2550

2650

2700

D1

350

450

450

550

550

650

650

800

850

950

1000

1000

1000

THSD-I EModel

2000

2500

3000

4000

5000

6000

8000

10000

12000

14000

16000

18000

20000


1 up to THSD-I E (4000) 100mm less2 up to THSD-I E (4000) 200mm less3 up to THSD-I E (4000) 100mm less, from THSD-I E (12000) 100mm more4 up to THSD-I E (4000) 200mm less, from THSD-I E (12000) 100mm more5 Burner shown is monobloc type. Width/height may alter with fabricated

wind box type burner.6 Ducting and chimney diameters to be sized for site application

Pos. 14 up to THSD-I E (4000) 400mm less

Dimensions incl. 120 mm insulation thickness

Design pressure 10, 13 and 16 bar

(overpressure)

Other models available for different working

pressures.


Add 100mm to H1 for crane hooks.

2-8


Technical data

THSD-I E with economiser - subject to local site alterations

1 Boiler

2 Boiler base

3 Front reversal chamber

Hinged front door

4 Flue gas outlet


6 Inspection openings (water side)

7 Tube assembly



10 Safety valve(s)





15 Feed water valve(s)


17 Pressure stats

18 Feed water pump(s)


20 Burner

21 Vent valve

22 Condensate drainage

24 Economiser7

L

4700

4900

5100

5450

5900

6100

6600

7050

7450

7750

8050

8250

8750

B

2450

2550

2600

2700

2800

2900

3100

3300

3400

3600

3700

3800

3900

H

2700

2800

2850

3075

3250

3400

3650

3925

4125

4350

4425

4625

4725

H1

2250

2350

2400

2550

2650

2800

2925

3200

3300

3500

3600

3700

3800

H2

1175

1225

1250

1350

1400

1450

1550

1700

1750

1850

1900

1950

2000

D

1990

2090

2140

2240

2340

2440

2640

2840

2940

3140

3240

3340

3440

L3

300

300

300

300

300

300

300

350

350

350

350

350

350

L4

700

700

700

700

700

700

700

850

850

850

850

850

850

L1

2300

2500

2700

3000

3400

3600

4100

4500

5000

5000

5500

5500

6000

L2

400

400

400

400

400

400

400

475

475

475

475

475

475

B1

1175

1225

1250

1350

1400

1450

1550

1700

1750

1850

1900

1950

2000

B2

160

160

160

160

160

160

160

200

200

200

200

200

200

H3

1750

1825

1850

1950

2000

2100

2200

2350

2400

2500

2550

2650

2700

D1

350

450

450

550

550

650

650

800

850

950

1000

1000

1000

THSD-I EModel

2000

2500

3000

4000

5000

6000

8000

10000

12000

14000

16000

18000

20000


1 up to THSD-I E (4000) 100mm less2 up to THSD-I E (4000) 200mm less3 up to THSD-I E (4000) 100mm less, from THSD-I E (12000) 100mm more4 up to THSD-I E (4000) 200mm less, from THSD-I E (12000) 100mm more

Pos. 14 up to THSD-I E (4000) 400mm less5 Burner shown is monobloc type. Width/height may alter with fabricated

wind box type burner6 Ducting and chimney diameters to be sized for site application7 Economiser can be positioned vertically.

Dimensions incl. 120 mm insulation thickness

Design pressure 10, 13 and 16 bar

(overpressure)

Other models available for different working

pressures.


Add 100mm to H1 for crane hooks.

2-9

Hoval

To facilitate installation andmaintenance the stated clearancesshould be met. Drawing indicates righthand (standard) hinged door

Minimal space refers to boiler.Depending on equipment (accessories)the minimal space needs to bereviewed according to local codes.

Positioning

- No air pollution throughhalogenated hydrocarbon(contained e.g. sprays, paints, solvents and cleaners)

- No large amounts of dust- No high atmospheric humidity- Frost-resistant, dust free and well

ventilated- Boiler to be installed and

positioned in a weatherproof, non-hazardous and safe classified area.

Otherwise damage to the installationmay occur.

The boiler may only be installed inrooms where air pollution throughhalogenated hydrocarbon can occur ifsufficient measures are taken ensuringthe supply of unpolluted combustionair.

Boiler room dimensions can bereduced by the fitting of a shutter dooror knockout panel.

Model

THSD-I E a (mm)

2000

2800

2500

3000

3000

3200

4000

3550

5000

4000

6000

4200

8000

4700

10000

5100

Model

THSD-I E a (mm)

12000

5500

14000

5800

16000

6100

18000

6300

20000

6800

*300mm+ burner overall length (consider pivoting range/pivoting side)**Consider control panel, pump(s) assembly***Flame tube length for tube withdrawal/cleaning


Technical data

Typical Installation

2-10

a ***

* 1200Minimum

** 1200Minimum

500 Minimum

500 Minimum


Engineering

Rules and regulations

The following rules and regulations

have to be respected:

- Hoval technical information and

installation guide

- Fire protection regulations

- National regulations concerning

permission, installation and operation of

boiler appliances. Boiler appliances

have to be installed according to

national laws and regulations and

accessory requirements.

- Besides the national and local

regulations the project specific

circumstances of the boiler supplier

have to be considered for every

application.

Water treatment/water quality

- The quality of the boiler water has to be

guaranteed according to Hoval technical

information and national guidelines.

- Hoval boilers may only be operated with

treated water. The national regulations

for the treatment of water apply for the

values to be maintained.

- Required water quality: see page 2-12.

- The water quality has to be checked

daily.

Planning, operation and

maintenance

- The heating of the feed water and the

degassing takes place in the feed water

tank (hot well).

- To increase the efficiency, especially for

natural gas operation, an economiser

can be added to pre-heat the feed

water.

- Pumps (especially horizontal rotary

pumps and warm water/condensate

pumps, NPSH pumps) need to be

installed with the necessary flow and

return pipework according to

requirements. The installation has to be

completely free of tension (anti-

vibration proof).

- Feedwater tank height must satisfy the

feed pump NPSH requirement.

- National and local rules and regulations

have to be considered for the fuel

supply. Fuel filters are highly

recommended

- The operation and water analysis data

is to be recorded daily in the operation

booklet.

- Safety valve, condensate and blowdown

connections must discharge to a safe

place.

- Filters and strainers have to be cleaned

periodically, especially if installed in

front of control devices.

- The drain of the tds, blow down,

drainage, etc has to be safely

discharged into a blowdown vessel.

- All heating components and pipework

are to be insulated in order to reduce

radiation losses.

Combustion air

- The supply of combustion air must be

guaranteed for a safe and economic

operation. There must be no possibility

of the air supply being shut off.

- Ventilation of the boiler house has to

also be provided.

- In the installation room no negative

pressure larger than 3 N/m2 is allowed.

To adhere to this demand, plan a free

area for the air supply opening of at

least 200 cm2, plus 2 cm2 per KW

output. The aspect ratio for rectangular

openings should not be more than 1.5 :1.

If the opening is louvered ensure

the free area is sufficient. National laws

have to be respected.

- Boiler houses have to be fitted with

relevant fresh air supply openings or

ducted system.

- Gas boilers are not to be installed in

rooms where halogen compounds occur

which can enter the combustion air.

Noise level reduction

The following measures for noise level

reduction are possible:

- Solid construction of boiler room

walls, ceiling and floor, installation

of silencer in fresh air supply, noise

insulation for support and bracket

of pipes.

- Installation of acoustic shroud for

the burner.

- A substantial part of the sound caused

in the combustion chamber and in the

top heating surfaces is radiated from

the flue outlet as sound transmitted by

air. In addition to this, resonance

features, depending on chimney

dimensioning and inlet, may occur

which are triggered by the oscillation of

the combustion process. These sounds

can be reduced by burner-lateral

measures, e.g. changes of flame

geometry, atomisation characteristics or

fuel throughput.

- Flue gas attenuators cause a substantial

sound level reduction. These should

usually be tuned at low frequencies of

60 - 250 Hz. Flue gas attenuators

function according to the principle of

sound absorption. The kinetic energy of

the exhaust gases is reduced by friction

requiring an increase in chimney draft in

the flue system. This has to be

considered for burner sizing. The

connection piece from the boiler to the

flue gas sound absorber has to be

gastight.

- The necessary space requirement of

approximately 1 m for the later

installation of a flue gas attenuator

should already be included when

planning.

Chimney/flue gas system

- A properly designed chimney/flue

arrangement must be provided to

match each particular application.

- To achieve a smooth discharge of the

exhaust gases from the boiler into the

chimney, the flue connection is

recommended to enter the chimney at

approximately 30-45°.

- From a length of greater than 1 m

thermal insulation is necessary.

- Adequate provision should be made to

drain off condensate from the base of

the chimney ensuring condensate does

not run back into the boiler smokebox.

2-11


Boiler and feed water specifications for steam boiler plants

Feed water specifications for natural circulating boilers

Boiler water specifications for natural circulating boilers



pH-value at 25°C > 9 > 9 >9


°dH < 0,112 < 0,112 < 0,056

Conductivity at 25°C µS/cm see guidelines for boiler water specifications only

Oxygen (O2) mg/l < 0,1 < 0,02 < 0,02


Iron (Fe), total mg/l - < 0,05 < 0,03

Copper (Cu), total mg/l - < 0,01 0,005

Silicate acid (SiO2) mg/l see guidelines for boiler water only

Consumption of Potassium permanganate mg/l < 10 < 10 < 10

Oil, fat mg/l < 3 < 1 < 1

1 Noted in the past at °dH, changing factor: 1 mmol/l = 5,6 °dH (German hardness).

It is not necessary to make continuous control of the following parameters: Conductivity, Oxygen (O2), Carbon dioxide (CO2)

dissolved, Iron (Fe), total, Copper (Cu), total, Silicate (SiO2), Consumption of Potassium permanganate, Oil, fat.



pH-value at 25°C 10,5-12 10,5-12 10-11,8


°dH < 0,112 < 0,112 < 0,056

Conductivity at 25°C µS/cm < 5000* < 5000* < 2000*

Acid capacity KS 8,23 (p-value) mmol/l 1-12 1-12 0,5-6


Iron (Fe), total mg/l - < 0,05 < 0,03

Silicate acid (SiO2) mg/l < 150 < 100 < 50

Phosphate (P2O4)4 mg/l 10-20 5-10 5-10

Sodium sulphate (Na2SO3)4 mg/l 5-10 5-10 3-5

(Polyamide)5 mg/l (3-5) (3-5) --

1 Take care to maintain the allowed value of acid capacity - at this point the allowed conductivity has to be lower on many

plants; for water level electrodes minimum conductivity > 5 µS/cm2 Noted in the past at °dH, changing factor: 1 mmol/l = 5,6 °dH (German hardness)3 Noted in the past as p-value, changing factor: KS 8,2 = 1 according p-value = 14 Measurements only necessary if dosing chemicals are used which contains these values5 It is recommended to use Amine (film producing) only instead of other dosing chemicals for boilers which have a small

heating load and up to maximum 16 bar working pressure. Because of the danger of foam production overdosing is not

permitted!

Boiler water quality to comply with BS2486.It is not necessary to make continuous control of the following parameters: Silicate (SiO2)

Important note: Hoval recommend that a water treatment specialist is employed to advise on each application and to carry

out routine monitoring of the feed and boiler water to ensure it remains within specification.

2-12

Hoval LimitedNorthgateNewarkNottinghamshire NG24 1JN

Tel: 01636 672711

Fax: 01636 673532

[email protected]

www.hoval.co.uk

Hoval ExportAustrasse 70, 9490 VaduzPrincipality of Liechtenstein

Tel: +423 399 2400

Fax: +423 399 2618

[email protected]

www.hoval.com

Hoval follows a policy of continued improvement and reserves the right to change specifications without notice.All dimensions are approximate.

5080

By Appointment toHer Majesty The Queen

Boiler Manufacturers & EngineersHoval Limited, Newark

hoval brochure

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