John Crane 502
John Crane 502
John Crane 502
Maxim
40mm
um Pr
essur
300
es
200
50mm 15 60mm 68mm 10 5 0 70 160 Minimum Pressures 80 180 90 200 100 220 110 120 130 260 140 280 150 300
100
240 Temperature
PV Multiplier Factors
Selection Considerations Sealed Fluid Lubricity Face and Seat Materials Petrol, Kerosene or better Water, Aqueous Solutions, Lighter Hydrocarbons (s.g. 0.65) Carbon v. Sintered Silicon Carbide or Silicon Carbide Converted Graphite v. Sintered Silicon Carbide Tungsten Carbide v. Tungsten Carbide Carbon v. Aluminium Oxide or Austenitic Cast Iron Sintered Silicon Carbide v. Sintered Silicon Carbide up to 80C /175F Above 80C to 120C/175F to 250F Above 120C to 180C/250F to 355F Above 180C to 230C/355F to 445F up to 1800rpm Above 1800 to 3600 rpm Multiplier Factors x 1.00 x 0.75 Example for Determining PV Limits: Seal: 45mm diameter Type 502 Product: Water Face and seat material: Carbon graphite v. aluminium oxide Operating temperature: +10C/50F Operating speed: 1750 rpm x 0.80 x 0.60 x 0.60 x 0.50 x 1.00 x 0.90 x 0.80 x 0.65 x 1.00 x 0.85 Using Pressure/Velocity (PV) Limits table, the maximum pressure would be 28 bar g/400 psig. From PV Multiplier Factors table, apply the multiplier factors for the specific service requirements: 28 bar g/400 psig x 0.75 x 0.60 x 1.00 x 1.00 = 12.6 bar g/189 psig Therefore for the example given the maximum operating pressure is 12.6 bar g/180 psig.
Speed
502
Elastomer Bellows Seal
Middle East, Africa, Asia Dubai, United Arab Emirates Tel: 971-4-3438940 Fax: 971-4-3438970
North America Morton Grove, Illinois USA 1-800-SEALING Tel: 1-847-967-2400 Fax: 1-847-967-3915
For your nearest John Crane facility, please contact one of the locations above. If the products featured will be used in a potentially dangerous and/or hazardous process, your John Crane representative should be consulted prior to their selection and use. In the interest of continuous development, John Crane Companies reserve the right to alter designs and specifications without prior notice. It is dangerous to smoke while handling products made from PTFE. Old and new PTFE products must not be incinerated. 2002 John Crane Print 03/02
www.johncrane.com
ISO 9001, ISO 14001, ISO/TS 16949 Certified. Details available on request.
S-502/Eng
502
502
Elastomer Bellows Seal
Industries Served Chemical Processing Conveyor and Industrial Equipment Cryogenics Food Processing Gas Compression Industrial Blowers and Fans Marine Mixers and Agitators Nuclear Service Offshore Oil and Refinery Paint and Ink Petrochemical Processing Pharmaceutical Pipeline Power Generation Pulp and Paper Water Systems Wastewater Treatment Water Desalination
Applications
The Type 502 is a full convolution elastomeric bellows seal designed for confined spaces and limited gland depths. Self-aligning feature compensates for excessive shaft end play and run-out.
Fluids
Paints and Inks Water Weak Acids
Industries include chemical processing, food processing, gas compression, marine, nuclear service, offshore, oil & refinery, paint & ink, petrochemical processing, pharmaceutical, pipeline, power generation, pulp and paper, wastewater, water desalination, water systems. All types of rotary equipment, pumps, marine, mixers, agitators, blowers, fans and compressors in a variety of service applications. Supplied completely assembled for fast installation and field repairable. Complies with DIN 24960, ISO 3069, and BS.5257:1975.
Design Features/Benefits
Fast Installation Completely assembled one-piece design for fast installation. Unitised Design Unitised design incorporates positive retainer/key drive from bellows. Non-Clogging, Single Coil Spring Provides greater dependability than multiple spring designs. Will not be affected by build-up of solids. Compact Design Full convolution elastomeric bellows seal designed for confined spaces and limited gland depths. Self-aligning feature compensates for excessive shaft end play and run-out.
Operating conditions
Temperature: -40C to +205C/ -40F to +400F depending on materials used Pressures: up to 40 bar g/580 psig Speed: up to 13 m/s/2500 fpm
502
Elastomer Bellows Seal
Type 502 Typical Arrangement/Dimensional Data (mm)
IMPELLER BOSS SPACER, SHAFT SHOULDER OR CIRCLIP, OR ABUTMENT RING (NOT SUPPLIED) CIRCULATION CONNECTION BREAK EDGE X
10
1.5MM RADIUS For ease of installation, the lead-in edge of the shaft or sleeve should be chamfered as shown. D3 D4 MIN. BORE L3 *Recommended chamfer lengths: D10.05 SHAFT OR SLEEVE DIA. Seal Sizes 14 to 68 mm 70 to 100 mm Dim. X 3 mm 8 mm
The working length for both single, L1K, and double, 2 x L1K, Type 502 seals conforms to DIN 24960 without special spacer pieces being needed.
Pressure (psig)
Carbon Graphite or Silicon Carbide 600 Converted Graphite vs. Silicon Carbide 500 or Tungsten Carbide at 1450 to 1740 rpm
To determine the maximum pressure for the size of Type 502 seal required, multiply the pressure obtained from this table by the appropriate factors given in PV Multiplier Factors table. The maximum operating pressures shown apply under the following conditions: carbon graphite face/primary ring running against a silicon carbide or tungsten carbide seat/mating ring up to 1800 rpm, with a lubricating sealed fluid up to 80C/175F.
502
Elastomer Bellows Seal
Speed Limits
Shaft Speed (rpm) 6000 5000 4000 3000 2000 1000 0 0 0 Stationary Seat arrangement Rotating Seal and Stationary Seat Maximum Face Velocity 13 m/s/2500 fpm Stationary Seal and Rotating Seat (For speeds above the limits shown, consult John Crane)
Rotating seals may be used at speeds up to 4000 rpm according to seal size. Above the limit shown, it is necessary to stationary mount the seal unit and use a rotating seat. This would necessitate a special arrangement and would not conform to DIN 24960.
20 1
40
60 2 Seal Size
80 3
For hydrocarbon duties the limit is +120C/250F. For water duties the temperature should not exceed +135C/275F. For water or steam duties the limit is +150C/300F.
Material Availability
SEAL COMPONENTS Description Bellows Seat 0-Ring Face Retainer/Spring/Drive Ring Assembly (Metal Parts Set) Securing Ring (BC Seat) BO Seat* BC Seat* Abutment Ring Setscrews MATERIALS Standard Nitrile Fluorocarbon Ethylene Propylene Silicon Carbide Converted Graphite Resin Impregnated Carbon Graphite 316 Stainless Steel Options
Austenitic Cast Iron (Ni-Resist) Aluminium Oxide Ceramic 316 Stainless Steel
*Seat types BP or BD can be used for applications requiring a secured and/or pinned seat, with PTFE, exfoliated graphite or elastomer seat ring. Optional parts: not supplied unless specially ordered.
502
Elastomer Bellows Seal
Criteria for Installation
Shaft/Sleeve Surface Finish Limits 0.8 to 1.2 m Ra Fine Machined 0.1mm/ 0.004 in. 0.08mm/ 0.003 in. See Housing Squarness to Shaft table
Ovality/Out-of-Roundness
1000
4000
100
120 mm 100 mm
80
80 mm
60
60 mm
40
20
40 mm 20 mm
0 0
10 100 200
20
30