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03:36 PM
Dresser Style 31 line caps close off sections of a line during construction and testing, and cap dead ends left for future branch connections. Each cap is made from Style 38 coupling parts: a convex dished steel head is welded into one end of the middle ring, one follower is welded to the cap, and only one gasket is needed.
Application: Closing, testing and capping plain-end cast and ductile iron pipe.
Included: the cap body with welded head and follower, one loose follower, one gasket, bolts and nuts, and the 1 in vent plug.
Pipe prepared before install: a clean, round plain pipe end where the gasket seats.
Thrust blocking, by others: Dresser requires anchorage or blocking that holds the full end thrust of the line pressure before the cap is pressurized.
Covered for 12 months from the date of purchase under Dresser’s published warranty terms.
150 PSI MAOP in every size; Dresser builds higher ratings per application. The allowable pressure on a job also depends on the pipe, its condition, the service and the workmanship.
| Followers | AISI C1012 or ASME SA36 |
| Middle ring | ASTM A513, ASTM A635 or ASME SA675 GR60 |
| Bolts | AWWA C111 / ANSI A21.11 |
| Gasket | Grade 27 Buna-S standard |
| Coating | Fusion-bonded epoxy; RED-D shopcoat optional |
Source: Dresser Style 31 submittal, 2021.
| Nominal | Pipe OD (in) | Middle ring (in) |
|---|---|---|
| 2 | 2.500 | .187 x 5 |
| 3 | 3.800 | .188 x 5 |
| 3 | 3.960 | .203 x 5 |
| 4 | 4.800 | .229 x 5 |
| 4 | 5.000 | .229 x 5 |
| 6 | 6.900 | 1/4 x 5 |
| 6 | 7.100 | 1/4 x 5 |
| 8 | 9.050 | 1/4 x 5 |
| 8 | 9.300 | 1/4 x 5 |
| 10 | 11.100 | 3/8 x 7 |
| 10 | 11.400 | 3/8 x 7 |
| 12 | 13.200 | 3/8 x 7 |
| 12 | 13.500 | 3/8 x 7 |
| 14 | 15.300 | 3/8 x 7 |
| 16 | 17.400 | 3/8 x 7 |
| 18 | 19.920 | 3/8 x 7 |
| 20 | 21.600 | 3/8 x 7 |
| 20 | 22.060 | 3/8 x 7 |
| 24 | 25.800 | 3/8 x 7 |
Dresser Style 31 data sheet and 2021 submittal.
Source: Dresser Gas Product Selection Guide (NGS-DPS-015), product warnings.
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