jc drygas seal

8/7/2019 jc drygas seal

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TYPE 2800 & 280 0E WORLDS FIRST GAS LUBRICATED, NON-CONTACTING PUMP SEALS

s Zero Emissions

s Easy to Install

s

Lower Total Life Costs


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FUGITIVE PUMP EMISSIONS ARE CONTAINED SAFELY

THROUGHOUT THE LONG LI FE OF YOUR JOHN CRANE SEAL.

s Highest reliability in sealing volatile fluids

s Positive sealing of high purity fluids with virtually no process contamination

s No damage to pump from corrosive fluids leakage

s Zero emissions to atmosphere

s Simple to install

s Pump cavitation and dry-running does not affect seal performance

Over 5 Million Hours of Type 2800 Operational Experience on Pumps Worldwide

As the world leader in spiral groove technology, John Crane has more than 1,000 Type

2800 Series spiral groove seals in use in over 50 countries. The unique technology of

the Type 2800 Series is the reason why.

John Cranes

gas lubricated,

non-contacting

Type 280 0

Series Seals


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Unique Spiral Groove Technology

Patented John Crane spiral grooves are machined into the mating ring faces. A pressur-

ized suitable inert gas is injected between the seals. As the shaft rotates, gas flows into

the tip of the spiral groove and is compressed at the sealing dam, the ungrooved portion

of the mating ring. At the sealing dam, gas is expanded. The resultant film pressure gives

an opening force greater than the closing force, thus separating the faces. The Type 2800

spiral groove continues to operate, even if barrier gas pressure is momentarily lost, main-

taining the gas film between the barrier gas and the process.

As a result of this unique technology, you achieve zero emissions, plus:

s MTBPM extended up to 10 times. Several chemical companies have documented that their

Mean Time Between Planned Maintenance (MTBPM) has expanded by more than

2,000% with Type 2800 seals on difficult applications.

s

Lower repair costs. Because theres no contact, the seal faces do

not wear. And that can mean a seal life of up to five years.

s Lower energy costs. Type 2800 Series Seal uses 10%

of the energy of a typical liquid lubricated dual

seal. Your savings are even greater compared

with a sealless pump. A typical magnetic drive

pump consumes up to three times more

power than a wet seal system.

s

No need for water. Because theres no con-

tact, theres no heat generation, so theres

no need to cool seals with water. You elimi-

nate water treatment costs.


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John Cranes

gas lubricated,

non-contacting

Type 280 0

Series Seals

FAST PAYBACKCUSTOMERS DOCUMENT A COMPLETE RETURN

ON INVESTMENT IN JUST 3 TO 6 MONTHS!

Type 2800 & 2800E Seals are designed for a long life of five years. During this time, seal

repairs and maintenance costs are reduced or eliminated.

Type 2800 & 2800ESeals Cost Less than Conventional Liquid Lubricated Dual Seal Systems

Type 2800

Contain Seal Costs.

With a seal life of five years,

you save substantial repair

and replacement costs.

Eliminate Water Costs.

Since you dont need water

to flush seals, you dont have

water treatment costs.

Contain Fugitive Emissions.You get 100% containment

zero leakage of process

emissions to the atmosphere.

Reduce System Costs.

This barrier system cost is

significantly less than a typi-

cal wet seal support system.

Reduce Equipment Costs.

Upgrade existing pumps for

compliance with current and

future emission standards

without the need for replac-

ing your existing pumps.Contain Energy Costs.

Energy consumption is

less than 10% of a wet

dual system.

Achieve Reverse Pressure

Capability. In the event of

upset conditions, this feature

prevents process fluid from

escaping, thus maintaining

seal integrity.

*Based on savings at GEPlastics, Mount Vernon, IN ** Larger seal size *** There is a one time cost for the gas panel, which is US$900/563

Type 2800 E

Conventional Liquid

Lubricated Seal Type 2800 Series Seal

Initial Cost US$5,000/3,125 US$6,000/3,750**

Energy Consumption US$3,000/1,875 US$135/84

Cooling Water Cost US$1,750/1,094

Nitrogen Cost US$2/1

Pump Maintenance US$300/188 US$300/188

First year cost per pump* US$10,050/6,282 US$6,437/4,023* **

Second year cost per pump US$5, 050/3, 157 US$437/273


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Broadest Operating Ranges

Type 2800 seals cover a wide range of performance capabilities:

Temperature -40F to +500F/-40C to +260C

Pressure To 300 psig/21 barg

Speed To 5,000 fpm/25 m/s

Type 2800 Series Seals Give You Proven Performance

John Crane proprietary computer programsCSTEDYSM and CTRANSSMassure optimal

design of critical components for peak performance, and accurately predict that perfor-

mance. The prediction is based on analysis of the combined effects of pressure, tempera-

ture, fluid sealed and friction on the distortion, and temperature distribution.

Full Compliance Without Costly, Time-Consuming Monitoring

Type 2800 Series Seals comply with air pollution and international environmental require-

ments. Spiral groove technology prevents emissions; there is no need for costly, time-con-

suming emission monitoring.

Magnetic Drive Pumps Become Obsolete

With Type 2800 Seals, you dont need inefficient mag drive pumps. By eliminating sealless

pumps, you eliminate:

s expensive operation due to losses in magnetic couplings,

s

maintenance problems due to fluids that are poor lubri-cants, abrasive or corrosive, affecting sleeve bearing life,

s liquid flashing in the drive area that can result in dry-run-

ning the bearing with catastrophic pump failure,

s pump intolerance to system upsets or off-curve operation, and

s expensive repair that often includes taking the pumps out of service.

The John Crane Type 2800 & 2800E yield longer MTBPM and lower operating costs,

resulting in overall lower life cycle costs.

Comparison of Cost of Alte rnative Technologies(The double liquid lubricated mechanical seal is the basis for comparison.)

1. Based on 10 years. 2. Installation costs include the pump, motor and coupling in case of a long coupled pump, the seal, and barrier and monitoring systems, Plan 53 for

wet seal and nitrogen system for gas seals. 3. Operating cost includes electricity, emission, and cooling water/nitrogen consumption where applicable. 4. In summary, the

major advantage of a Type 2800 Series Seal is the greatly improved MTBR and its lower total life costs.

1 4 4 6 7 8 1 11 1 4 3 1 75 2 07 2 40 ( p si )

70 71 71 71 71 71 71 71 (F)

Double Liquid Lubri- Sealless Pumpcated Mechanical Seal Mag Drive Type 2800 Series

Installation Costs 100 80-175 90-110

Operating Costs 100 110-150 40-90

Cost of Single Repair 100 175-200 105-150

Mean Time Between Repair 100 100-250 200-350

Total Life Costs 100 125-130 65-90


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John Cranes

gas lubricated,

non-contacting

Type 280 0

Series Seals

ALL YOU NEED IS READILY AVAILABLE, LOW-COST BARRIER GAS.

The barrier gas required in a Type 2800 system is any suitable, clean dry gas supplied to

the seal at 20 to 30 psig/1.5 to 2.0 barg above the process pressure.

Suitable gases are highly economical plant nitrogen, bottled nitrogen or plant instrument

air, and no forced circulation is required.

Type 2800 barrier gas consumption is typically just 0.05 to 0.5 SCFH/25 to 240 ml/hr.

Type 2800 Barrier Consumption

B

arrierGasConsumption(Nml/min)

BarrierGasConsumption(SCFM)

PROCESS

(barg)

(psig)

ATMOSPHERE

0

0.01

0.02

0.03

0.04

0.05

0.06

0.07

0.08

0

0 50 100 150 200 250 300

20151050

283

566

849

1132

1415

1698

1981

2264

15.0 m/s

12.5 m/s

5.0 m/s

2.5 m/s

Notes:

1. Data based on single seal arrangement

2. Consumption based on ambient temperature and

atmospheric pressure

3. Flow indicated by flowmeter at gas inlet is compressed

gas and therefore considerably less

Example: Seal Diameter 50 mm (2 in.)

*Correction Factor 12.7 mm

Calculation: 50 + 12.7 = 62.7 : 62.7 x 3.14 x

3600 (rpm variable)= 708 :

708= 11.8 m/s = Nml/min

*Correction Factor is the mean face diameter.

1000 (constant) 60

Proven Control Is Simplified

To ensure maximum reliability of your Type 2800 or 2800E Seal, John Crane provides

a range of compact, easy-to-install barrier gas control systems. Designed specifically to

interface with Type 2800 Seals, these systems:

s regulate barrier gas flow and pressure to

dry-running seals,

s filter barrier supply gas,

s monitor seal performance,

s prevent back flow of process fluid into the panel

by way of a check valve,

s have an optional pressure switch that provides

a signal for an alarm in the event of supply

pressure loss, and

s have an optional flow switch that provides a

signal for an alarm in the event of high barrier

gas flow to the seal.

System Components

1) Filter/coalescing element

2) Pressure regulator

3) Pressure gauge

4) Flow meter

5) Check valve

6) Ball valve

7) Pressure switch (optional)

8) Flow switch (optional)

1

2

3 47

6

5

Barrier Gas Enclosed Unit

Barrier Gas Panel


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John CraneNorth AmericaMorton Grove, Illinois USAPhone: 708-967-2400Fax: 708-967-3915

1-800-SEALING

1995 John Crane International. Patent #5,375,853ISO 9001 Certified

John CraneEurope, Asia, AfricaSlough, UKPhone: 44-1753-224000Fax: 44-1753-224224

John CraneAsia PacificSingaporePhone: 65-222-9161Fax: 65-223-5035

John CraneSouth AmericaSao Paulo, BrazilPhone: 55-11-536-9355Fax: 55-11-536-0454

John Crane International

Engineered Sealing Systems

Bulletin No. B-2800-APrinted 5/95

If the products featured will be used in a potentially dangerous and/or hazardous process, your John Crane representative should be consultedprior to their selection and use. In the interest of continuous development, John Crane Companies reserve the right to alter designs andspecifications without prior notice.

PUT THE WORLDS MOST ADVANCED GAS LUBRICATED

SEAL DESIGN TO WORK FOR YOU.

Type 2800 Seals are made for:

s All ANSI pumps, standard and enlarged bore

s

DIN pumpss API pumps

s Various other pumps and blowers.

Type 2800 Seals serve this partial list of representative fluids:

Acetic anhydride

Acrylonitrile

Alkyl resins

Anhydrous cyclohexane

Benzene

Benzene toluene

Bisphenol acetate

Butadiene

Dichlorobutadiene

Dichloroethane

Ethyl chloride

Ethyl hexanol bottoms

Formaldehyde

Gasoline

Glacial acrylic acid

Hydrocarbon

Kerosene

LPG

LatexMethanol

Molten chemical tar

Nitric acid

Organic acid

Phenol

Plastic pigment

Propane/butane

Propane with caustic

Recycle gas

Sanotherm 59

Slurry water

Sodium carbonate

Spent methanol & chemical

Styrene

Sugar solutions

Therminol

Therminol #59

Toluene diisocyanate

Wastewater/hydrocarbon

Wet gas

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