Flexible Rubber Connectors and Serpent Hose

Flexible Pipe Connector

Styles 3150 and 3250

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
Compared to Steel Pipe

Center Freq. Hz 8" I.D. X 24" F-F
Vibration Joint
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%

This series is manufactured with integral PTFE and elastomeric flanges to accommodate standard, metric or special drilled flanged.

PTFE or FEP can be provided for the tube to meet unique service conditions. Carbon steel retaining rings are required for installation. Beaded ends are also available.

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
STYLE 3250
STYLE 3150HT
STYLE 3250HT

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)

Min (in.)

Max (in.)

Ring I.D. (in.)

Flange

Bolt Circle Diam (in.)

Bolt Holes

Diam. (in.)

Thickness (in.)

No.

Diam. (in.)

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 4-3/4 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)

Ring I.D. (in.)

Flange

Bolt Circle Diam (in.)

Bolt Holes

Diam. (in.)

Thickness (in.)

No.

Diam. (in.)

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

For Working Pressures to 150 PSI

  For Water Service to 180°F For Water Service from 180 to 250°F Max
Flanged End 3150 3150 H.T.

For Working Pressures to 250 PSI

  For Water Service to 180°F For Water Service from 180 to 250°F Max
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

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