Hinged non-welded bow spring centralizer
› It is consists of bows, end collar with hinges and hinge pins. The formed bows are attached the end collar using rivets onto the hinged end collars. And the centralizers use hinged pins to secure the end collars together around the casing.
› The hinged designs is convenient for assemble and storage. When assembles, just place the two assembled haves on the pipe and insert the pins in the end collar hinge. Unassembled centralizers are packed and stored in compact package, which can reduce transporting and storage space and costs.
› Hinged non-welded bow spring casing centralizer is a simple, low cost spring design which can performs well in both vertical and slightly deviated wells as the bow springs are slightly larger than the wellbore.
› Combines the highest restoring force with the lowest starting force at all bow heights.
› The bows are heat treated in special furnace to ensure centralizers to provide the best centralization as well as help in faster running of casing.
› The bows angles are available in a range to accommodate any well profiles.
› Available in single bow or double bow design.
› Available in sizes 4-1/2" to 20" and special sizes are also available
Hinged centralizer parameter:
| Non welded centralizer specification(mm) |
| Bow type |
Hoop ring internal diameter(d) |
Hoop ring wall thickness(t) |
Hoop ring height(h) |
Total length(l) |
Max. O. D. Size |
Bow spring(n) |
| Double bow |
142-148 |
3-5 |
90-120 |
650±50 |
225±5 |
5 |
| Double bow |
181-186 |
3-5 |
90-120 |
650±50 |
255±5 |
6 |
| Single bow |
181-186 |
3-5 |
90-120 |
650±50 |
235±5 |
6 |
| Single bow |
223-228 |
3-5 |
90-120 |
650±50 |
330±5 |
8 |
| Single bow |
250-255 |
3-5 |
90-120 |
650±50 |
330±5 |
8 |
| Single bow |
274-276 |
3-5 |
90-120 |
650±50 |
330±5 |
9 |
| Single bow |
342-347 |
3-5 |
90-120 |
650±50 |
450±5 |
11 |
| Single bow |
476±1 |
3-5 |
90-120 |
600±50 |
610±5 |
12 |
| Single bow |
510±1 |
3-5 |
90-120 |
600±50 |
660±5 |
12 |
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