Flexible Rubber Pipe Connectors
3150, 3250 and 2150, 2250
UNAFLEX® "SUPER-QUIET" Flexible Rubber Pipe Connectors are designed with molded 
rubber flanged ends with bolt holes that accommodate standard steel flanges. They are furnished with or without helical wire reinforcement. Special tubes can be compounded to meet unique service conditions in either suction or discharge applications.
Percentage of Reduction of Vibration Input with Frequency and Pressure as Compared to Steel Pipe |
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| Center Freq. Hz | 8" I.D. X 24" F-F Vibration Joint |
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| 10 PSIG | 50 PSIG | 80 PSIG | |
| 440 | 87% | 91% | 93% |
| 68 | 95% | 96% | 99% |
| 125 | 98% | 99% | 99% |
| 250 | 96% | 97% | 99% |
| 500 | 91% | 93% | 94% |
| 1000 | 82% | 91% | 96% |
| 2000 | 99% | 99% | 99% |
| 4000 | 99% | 99% | 99% |
| 8000 | 97% | 97% | 98% |
Example: If a steel piping system had a major vibration frequency of 1,000 Hz at 50 PSIG and and 8" rubber expansion joint was installed in the pipeline, the percentage of reduction of vibration would be 96%
Note: Above data taken from Fluid Sealing Association Handbook.
| Specify Unaflex Flexible Connectors | ||
STYLE 3150 |
150# W.P. 250# W.P. 150# W.P. 250# W.P. |
180ºF 180ºF 250ºF 250ºF |
Joint Size N.D. (in.) |
Face-to-Face |
Style 3150 (Conforms to ANSI 150# Drilling) |
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Min (in.) |
Max (in.) |
Ring I.D. (in.) |
Flange |
Bolt Circle Diam (in.) |
Bolt Holes |
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Diam. (in.) |
Thickness (in.) |
No. |
Diam. (in.) |
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| 1 1/2 | 12 | 24 | 2-7/8 | 5 | 11/16 | 3-7/8 | 4 | 5/8 |
| 2 | 12 | 24 | 3-5/8 | 6 | 11/16 | 3-3/4 | 4 | 3/4 |
| 3 | 12 | 36 | 4-5/8 | 7-1/2 | 27/32 | 6 | 4 | 3/4 |
| 4 | 12 | 36 | 5-7/8 | 9 | 27/32 | 7-1/2 | 8 | 3/4 |
| 5 | 12 | 36 | 6-7/8 | 10 | 15/16 | 8-1/2 | 8 | 7/8 |
| 6 | 18 | 36 | 7-7/8 | 11 | 31/32 | 9-1/2 | 8 | 7/8 |
| 8 | 24 | 48 | 9-7/8 | 13-1/2 | 31/32 | 11-3/4 | 8 | 7/8 |
| 10 | 24 | 48 | 12-1/8 | 16 | 1-3/16 | 14-1/4 | 12 | 1 |
| 12 | 24 | 48 | 14-1/2 | 19 | 1-7/32 | 17 | 12 | 1 |
Style 3250 (Conforms to ANSI 300# Drilling) |
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Ring I.D. (in.) |
Flange |
Bolt Circle Diam (in.) |
Bolt Holes |
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Diam. (in.) |
Thickness (in.) |
No. |
Diam. (in.) |
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| 2-7/8 | 6-1/8 | 23/32 | 4-1/2 | 4 | 7/8 |
| 3-5/8 | 6-1/2 | 23/32 | 5 | 8 | 3/4 |
| 4-5/8 | 8-1/4 | 27/32 | 6-5/8 | 8 | 7/8 |
| 5-7/8 | 10 | 7/8 | 7-7/8 | 8 | 7/8 |
| 6-7/8 | 11 | 15/16 | 9-1/4 | 8 | 7/8 |
| 7-7/8 | 12-1/2 | 15/16 | 10-5/8 | 12 | 7/8 |
| 9-7/8 | 15 | 1-1/16 | 13 | 12 | 1 |
| 12-1/8 | 17-1/2 | 1-11/32 | 15-1/4 | 16 | 1-1/8 |
| 14-1/2 | 20-1/2 | 1-11/32 | 17-3/4 | 16 | 1-1/4 |
Unaflex® "Super-Quite" Styles 2150 and 2250 Flexible Rubber Pipe Connectors are specially designed lengths of rubber pipe with factory attached
ferrules for pipes and other connections involving standard IPT. They eliminate vibration between pump and pipe line either for suction or discharge.
For Working Pressures to 150 PSI |
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| For Water Service to 180°F | For Water Service from 180 to 250°F Max | |
| Ferruled Coupling | 2150 | 2150 H.T. |
| Flanged End | 3150 | 3150 H.T. |
For Working Pressures to 250 PSI |
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| For Water Service to 180°F | For Water Service from 180 to 250°F Max | |
| Ferruled Coupling | 2250 | 2250 H.T. |
| Flanged End | 3250 | 3250 H.T. |
| Pipe Size I.D. (in.) | Standard Overall Length (in.) | Pipe Size I.D. (in.) | Standard Overall Length (in.) |
| 3/4 | 12 | 2 | 24 |
| 1 | 18 | 2-1/2 | 24 |
| 1-1/4 | 18 | 3 | 36 |
| 1-1/2 | 18 | 4 | 36 |