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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