API Certified Small Parts Seating Nipple Oilfield Pump Parts
Small Parts in Rod Pump Description
There are seven major components for downhole rod pumps: standing and traveling valves, plunger, barrel, seating assembly, pull tube or valve rod (for insert pump), and the fittings that hold the assembled pump together. The most common of these components and the final types of assembled pumps are covered by American Petroleum Institute (API) Specification 11AX.
Technical Specifications of Pump Plungers
| Model | Part No. | API No. | Mark |
| P21A | P21A-106(XX)-L | P21-106 | Plunger, Pin End,
One Piece |
| P21A-125(XX)-L | P21-125 |
| P21A-150(XX)-L | P21-150 |
| P21A-175(XX)-L | P21-175 |
| P21A-200(XX)-L | P21-200 |
| P21A-225(XX)-L | P21-225 |
| P21A-250(XX)-L | P21-250 |
| P21I | P21I-106(XX)-L | P21-106 | Plunger, Pin End,
One Piece, inclined plane |
| P21I-125(XX)-L | P21-125 |
| P21I-150(XX)-L | P21-150 |
| P21I-175(XX)-L | P21-175 |
| P21I-200(XX)-L | P21-200 |
| P21I-225(XX)-L | P21-225 |
| P21I-250(XX)-L | P21-250 |
| P21I-275(XX)-L | P21-275 |
| P21I-325(XX)-L | — |
| P21I-375(XX)-L | P21-375 |
| P22 | P22-125(XX)-L | P22-125 | Plunger,
Assembled |
| P22-150(XX)-L | P22-150 |
| P22-175(XX)-L | P22-175 |
| P22-200(XX)-L | P22-200 |
| P22-225(XX)-L | P22-225 |
| P22-250(XX)-L | P22-250 |
| P22-275(XX)-L | P22-275 |
| P23 | P23-175(XX)-L | P23-175 | Plunger,
Box End |
| P23-225(XX)-L | P23-225 |
| P23-275(XX)-L | P23-275 |
| P23-375(XX)-L | P23-375 |
Materials selection
API Spec. 11AX was modified to add not only new sizes and types of pumps with new quality, inspection, and tolerance requirements, but also standardized, widely used pump-component materials. Various material descriptions, their API identification symbol, surface condition, base core hardness, base material, and base-material minimum yield strength for plated barrels, are shown in Table A of Spec. 11AX. Similar tables in Spec. 11AX (B through I) are incorporated for case-hardened barrels, nonhardened barrels, balls and seats, cages, pull tubes, valve rods, fittings, seating cups, spray-metal plungers, and plated plungers. These changes have incorporated the prior information in API RP 11AR[2] and the NACE International MR 01-76[3] for materials to be used in most production environments.
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