boiler specification with mountings

7/30/2019 Boiler specification with mountings

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BOILER & STEAM UTILITYSYSTEM


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Boiler Construction

As per IBR regulations 1950.

Heating surface area- 148 m2

Water holding capacity- 12 m2

Overall length- 5.5 m

Shell diameter- 2.4 m

Corrugated furnace diameter- 1.12 m


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Material of construction

Shell & furnace plates- SA 515/516 Gr 70 CS

pressure vessel plates for medium & high

temperature service.

Plain & stay tubes- confirming to BS 3059

Valve body _ carbon steel WCB with flanged

end connections.

Fusible plug- Alloy comprising of Tin, Lead &

antimony


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Boiler mountings

Water gauge glasses mountings- consists ofsteam side cock & water side cock, levelglass, protector & drain lines.

Pressure gauge- Bourdon pressure gauge10 dia. dial with a range: 0-25 Kg/cm2

Safety valves 40 x 80: spring loaded fulllift safety relief valve- 2 Nos.

Feed check valve- plate type mounted onfeed pump discharge

Main steam stop valve- Globe typemounted on boiler drum


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Mountings Continued .

Blow down valveParallel sliding type

mounted at bottom line from boiler

Air vent valve- Globe type mounted on top ofboiler drum

Fusible plug- 2 Nos. of small welded fitting

filled with low melting temperature alloy, onemounted on reverting chamber another at end

plate on top of smoke tubes at 2nd 3rd passjunction chamber.

Man hole- mounted on top of shell

Mud hole- at bottom of shell.


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Accessories continued . Oil preheating unit- Dual operated

with electrical & steam oil pre_heaterwith shell & tube type heat exchanger

Oil pre_filter- Bucket type filter witha standby

Burner assembly- pressure jet typeburner with auto regulatingarrangement to meet loadrequirement.

Modulating unit- Step less modulatingunit with a turn down ratio of 4:1regulating the air fuel requirement ofvarious load requirement


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Instrumentation & safety cut

offs

Extra low water level in drumcut offby Mobrey unit

High pressure switch- Sensing the steampressure inside the boiler and trips thefiring at the set pressure.

Flame failure sensor- a photo cell unitmounted on the burner assembly, cut offthe fuel supply in absence of no flame

High flu gas temperature- cut off

Low oil temperature- cut off Flue gas outlet damper closed- cut off

by limit switch


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Fuel oil Specification

Furnace oil confirming to IS 1593-1988 grade MV-2

Calorific value9600 Kcal/ Kg (approx)

Kinematic viscosity @ 15o C -125180 cSt.

Kinematic viscosity @ 100o C


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Water Quality RequirementAs per IS 10392-1982Feed water requirement:-

Total hardness 10 mg/l max

pH value- 8.5 to 9.5

Dissolved oxygen- .1 mg/l max.

Boiler water requirement:- Total hardness Not detectable

pH value- 11.0 to 12.0

Total alkalinity- 700 mg/l max.

Caustic alkalinity- 350 mg/l max. Residual sodium sulphite 3050 mg/l

Phosphates as (PO4)20-40 mg/l

boiler specification with mountings

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