— FM APPROVED · FM 1613
Alwasail Back-Up Rings FM Approved
For stub ends · PP-coated steel and steel
| SDR | Type | Nominal size (mm) | Rated pressure | Notes | |
|---|---|---|---|---|---|
| bar | psi | ||||
| — | PP-coated steel | 50, 63, 75, 90, 110, 125, 140, 160, 180, 200, 225, 250, 280, 315, 355, 400, 450 | 13 | 185 | b, c |
| — | Steel | 355, 400, 450, 500, 560, 630 | 13 | 185 | — |
b The manufacturer’s butt fusion welding instructions must be strictly followed to make a proper joint.
c Fittings are manufactured to ISO 4427.
Approval is subject to satisfactory field performance, continuing surveillance audits and strict conformity to the constructions shown in the FM Approval Guide. Check the current listing at www.approvalguide.com.
FM Approved · PR475941 · 2026 Edition
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