S-1/1B-A

1/1B
ELASTOMER BELLOWS SEAL
Applications Non-Concurrent Operating

1/1B
Type 1 seals are specified in more Conditions
original equipment than any other seal
from any manufacturer. They have the ■
Temperatures: - 40˚C to + 205˚C/
highest success rate of any seal of their - 40˚F to + 400˚F
type, and are suitable for a wide range (depending on
materials used)
of service conditions: from water to
steam to chemicals and corrosive ■ Pressures: 1: 29 bar g/
materials. 425 psig
■ For use in pumps, mixers, blenders, 1B: 82 bar g/
agitators, refrigeration compressors, 1200 psig
blowers, fans and other rotary shaft ■ Speeds: See Chart 8 for speed
equipment.
requirements
■ For pulp and paper, petrochemical,
food processing, wastewater
treatment, chemical processing,
power generation and other
demanding applications.
■
Both Type 1 and 1B can be repaired in
the field to minimize replacement cost,
downtime and lost revenue.

INCH RANGE
 1/1B
ELASTOMER BELLOWS SEAL
Design Features

Mechanical Drive Self-Aligning Special Balancing

The drive band’s notch design Automatic adjustment compen- For higher pressure applica-
eliminates over-stressing of the sates for abnormal shaft end play tions, greater operating speeds
elastomer bellows. Bellows slip run out, primary ring wear and and less wear.
is eliminated. The shaft and equipment tolerances.
sleeve are protected from wear.

Non-Clogging, Single Coil Spring Low Drive Torque

Provides greater dependability than The design of the seal and material
multiple spring designs. Will not be selection creates a low level of breakout
affected by build-up of solids. torque which improves performance
and reliability for fractional horsepower
motors.
 1/1B
ELASTOMER BELLOWS SEAL
Ty p i c a l A r r a n g e m e n t / D i m e n s i o n a l D a t a

Ty p e 1

D4
MIN. BORE D3 1/32"
SEAL O.D. MIN.
L5
± .031"

L38
L3 D1
± .031" ± .002"
SHAFT DIA.
Type 1 with Spring Adapter

Set Screw
Collar Option

C h a r t 1 . Ty p e 1 D i m e n s i o n a l D a t a C h a r t 2 . Ty p e 1 B D i m e n s i o n a l D a t a
(Inches) (Inches)
Seal Seal
Size Size
(inches) D1 D3 D4 L3 L5 L38 (inches) D1 D3 D4 L3 L65
1.000 1.000 1.500 1.750 1.562 1.687 .375 1.000 1.000 1.500 1.750 1.875 .343
1.125 1.125 1.625 1.875 1.625 1.750 .375 1.125 1.125 1.625 1.875 1.937 .343
1.250 1.250 1.812 2.000 1.625 1.750 .375 1.250 1.250 1.812 2.062 1.937 .343
1.375 1.375 1.875 2.125 1.687 1.750 .375 1.375 1.375 1.875 2.125 2.000 .343
1.500 1.500 2.000 2.250 1.687 1.750 .375 1.500 1.500 2.000 2.250 2.000 .343
1.625 1.625 2.250 2.500 2.000 2.000 .375 1.625 1.625 2.250 2.500 2.375 .437
1.750 1.750 2.375 2.625 2.000 2.000 .375 1.750 1.750 2.375 2.625 2.375 .437
1.875 1.875 2.500 2.750 2.125 2.125 .375 1.875 1.875 2.500 2.750 2.500 .437
2.000 2.000 2.625 2.937 2.125 2.125 .375 2.000 2.000 2.625 2.937 2.500 .437
2.125 2.125 2.812 3.125 2.375 2.375 .500 2.125 2.125 2.812 3.125 2.750 .500
2.250 2.250 2.937 3.250 2.375 2.375 .500 2.250 2.250 2.937 3.250 2.750 .500
2.375 2.375 3.062 3.375 2.500 2.500 .500 2.375 2.375 3.062 3.375 2.875 .500
2.500 2.500 3.187 3.500 2.500 2.500 .500 2.500 2.500 3.187 3.500 2.875 .500
2.625 2.625 3.375 3.750 2.750 2.750 .500 2.625 2.625 3.375 3.750 3.125 .562
2.750 2.750 3.500 3.875 2.750 2.750 .500 2.750 2.750 3.500 3.875 3.125 .562
2.875 2.875 3.625 4.000 2.875 2.875 .500 2.875 2.875 3.625 4.000 3.250 .562
3.000 3.000 3.750 4.187 2.875 2.875 .500 3.000 3.000 3.750 4.187 3.250 .562
3.125 3.125 4.000 4.437 3.125 3.125 .500 3.125 3.125 4.000 4.437 3.500 .625
3.250 3.250 4.125 4.562 3.125 3.125 .500 3.250 3.250 4.125 4.562 3.500 .625
3.375 3.375 4.250 4.687 3.125 3.125 .500 3.375 3.375 4.250 4.687 3.500 .625
3.500 3.500 4.375 4.812 3.125 3.125 .500 3.500 3.500 4.375 4.812 3.500 .625
3.625 3.625 4.500 4.937 3.250 3.250 .562 3.625 3.625 4.500 4.937 3.625 .625
3.750 3.750 4.625 5.062 3.250 3.250 .562 3.750 3.750 4.625 5.062 3.625 .625
3.875 3.875 4.750 5.187 3.375 3.375 .562 3.875 3.875 4.750 5.187 3.750 .625
4.000 4.000 4.875 5.312 3.375 3.375 .562 4.000 4.000 4.875 5.312 3.750 .625

Ty p e 1 B
.125"

High Pressure 20°

D3 Mating Ring
SEAL O.D. Support For ease of installation, the lead-
D4 in edge of shaft or sleeve should
MIN. BORE L65 be chamfered as shown.

D1
± .002"
SHAFT DIA. L3
± .031"
 1/1B
ELASTOMER BELLOWS SEAL
Chart 3. Pressure/Velocity (PV) Limits

A. Lubricating Liquids B. Non-Lubricating Liquids

Pressure (psig) Pressure (bar g) Pressure (psig) Pressure (bar g)

1200 83 1200 83

1100 76 1100 76

1000 69 1000 69
900 62 900 62
800 58 800 58

700 48 700 48
600 41 600 41
500 34 500 34
400 28 400 28
300 21 300 21
200 200
14 14
100 100
7 7

0 1 2 3 4 5 6 (inches) 0 1 2 3 4 5 6 (inches)

0 25 50 75 100 125 150 (mm) 0 25 50 75 100 125 150 (mm)

Seal Size Seal Size

Type 1B - Carbon vs. Silicon Carbide To determine the maximum pressure for the size of Type 1 or 1B Seal
1800, 3600 rpm required, multiply the maximum pressure from Charts 3A and 3B by the
factors in Chart 4 to obtain the maximum operating pressure.
Type 1B - Carbon vs. Ceramic 1. Lubricating liquid is defined as having lubricating properties of gasoline
1800 rpm or better. Non-lubricating liquid is defined as having lubricating proper-
Type 1B - Carbon vs. Ceramic ties of water or worse.
3600 rpm 2. Pressure capabilities to 83 bar g/1200 psig are based on lubricating oil
service, carbon vs. silicon carbide, and high pressure mating ring sup-
Type 1 - Carbon vs. Silicon Carbide port.
1800, 3600 rpm
Type 1 - Carbon vs. Ceramic
1800 rpm
Type 1 - Carbon vs. Ceramic
3600 rpm

Chart 4. Multiplier Factors

Example for Determining PV Limits:
Multiplier
Selection Considerations Seal: 76 mm/3 inches diameter Type 1B
Factor
Product: Water
Speed Up to 3600 rpm x 1.00 Face material: Carbon vs. Ceramic
Above 3600 rpm Temperature: 93°C/200°F
** Shaft speed: 1800 rpm
Sealed Fluid Below 79°C/175°F x 1.00
Using Chart 3B, the maximum pressure would be 440 psig/30 bar g.
Temperature Above 79°C to 121°C/175°F to 250°F x 0.90
From table of multipliers (Chart 4), apply the multipliers for the
Above 121°C to 177°C/250°F to 350°F x 0.80
Above 177°C/350°F x 0.65 specific service requirements to determine the maximum operating
pressure for this application.
600 x 1 x .67 x 1 = 402 psig/28 bar g
The maximum operating pressure of this 2 inch Type 1B seal
is 396 psig.
** Multiplier = 3600/new speed
Example: If new speed = 4000 rpm, Multiplier = 3600/4000 = .90 440 x 0.9 = 396 psig/27 bar g
 1/1B
ELASTOMER BELLOWS SEAL

Chart 5. Hydrostatic Pressure C h a r t 6 . B r e a k o u t ( S t a r t i n g ) To r q u e

Limits Consumption for Seal

Pressure (psig) Pressure (bar g) +50 1-50 Viscosity in cSt 1 2-50 +50
2000 135 90 6.0 4.0 9.0
Type 1B

Water & Medium Hydrocarbons

80 8.0
120 120 5.0

Medium Hydrocarbons
70

Heavy Hydrocarbons

Heavy Hydrocarbons
3.0
1500 100 100
60 4.0 6.0
80 50

Water
Type 1 80 4.0" 3.0 2.0
1000 60 40 3.5" 4.0
60 30 2.0
40 3.0" 2.5"
20 1.0
40 1.0 2.0
500 20 10 2.0"
20 1.5"
0 0 1.0" 0 0 0
0 100 200 300 400
0 0 Breakout Torque Power (HP) Required
0 1 2 3 4 5 (Inches) (ft/lbs) Fluid Pressure (psig) 1800 rpm

0 25 50 75 100 125 (mm)

Seal Size

Chart 8.Speed Limits for

C h a r t 7 . E l a s t o m e r Te m p e r a t u r e L i m i t s Coil Springs
Compound Temperature
Speed (rpm)
(°C) -100 0 100 200 300 400 500
Buna-N – 40°C to +107°C 6000 Stationary seal
– 40°F to + 225°F Welded end
coil spring head
5000
Fluoro- – 29°C to + 205°C Welded
elastomer – 20°F to + 400°F 4000 end coil
Standard spring and
adapter
Ethylene – 45°C to +150°C 3000 spring

Propylene – 49°F to + 300°F 2000 Welded end

coil spring
Neoprene – 40°C to +100°C 1000
– 40°F to + 212°F
0
(°F) -50 0 50 100 150 200 250 (Inches) 0 1 2 3 4 5 6
Shaft Size
Coil spring requirements for rotating Type 1 and 1B
seal heads with standard stuffing box diameter.

Chart 9. Recommendations for Viscous Chart 10. Criteria for

Fluids Installation

Special Seal Limits

Double Seal 50,000 15,000
1.000” to 3.125” dia.
Hard Face
63 Ra
Standard Seal Surface Finish
3.125” dia. & up.
32 Ra
Out of Roundness 0.05 mm/
15,000 3,000 (Shaft) 0.002”

5,000 1,000 Axial Float ±0.13mm/

Allowance 0.005”
Values in Values in
SSU cSt

cSt = Centistokes (cSt x 4.62 = ssu)

SSU = Saybolt Seconds Universal
 1/1B
ELASTOMER BELLOWS SEAL
Chart 11. Material of Construction

Seal Secondary Secondary Primary Ring Hardware Mating Ring Mechanical Loading
Component Sealing Sealing Retainer, Device
Materials Element Element for Disc, Drive Band, Springs
Bellows Mating Rings Spring Holder
Buna-N Carbon 316 Stainless Steel 316 Stainless Steel
Standard

Fluoroelastomer
Ethylene Propylene
Neoprene
Materials

Ethylene Propylene Carbon Monel Monel

Nuclear Service Nuclear Service
Options

20 CB-3 SS 20 CB-3 SS
Alloy 20 Alloy 20
Aflas* Tungsten Carbide

Solid Silicon Carbide

* Aflas is a registered trademark of Asahi Glass Co., Ltd.

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In the interest of continuous development, John Crane Companies reserve the right to alter designs and specifications without prior notice.

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