Get in touch with Welong Company
API 10D Minimum Restoring Force Reference
API Spec 10D minimum restoring force is defined at 67% standoff for bow-spring centralizers. Pick a casing size to see the published minimum our bow springs are built to meet or exceed.
Minimum restoring force at 67% standoff (API Spec 10D)
Request restoring-force test data →
| Casing size | Min restoring force (67% standoff) |
|---|---|
| 3½ in (89 mm) | 396 lbf (1,761 N) |
| 8⅝ in (219 mm) | 1,440 lbf (6,405 N) |
| 20 in (508 mm) | 1,880 lbf (8,363 N) |
Values per the API Spec 10D restoring-force framework. Intermediate casing sizes carry their own API 10D minimums — ask Welong for the full size table. Restoring force is measured with load accuracy within 5% and displacement within 0.8 mm (1/32 in).
