The API 11AX Tubing Pump is a downhole tubing pump designed to meet the American Petroleum Institute (API) Spec 11AX standard. As the production element placed at the bottom of the oil wells, it operates as the lower subsystem component of oil well pumping systems.
This specification encompasses the formulation of detailed design features and interchangeability provisions for downhole rod pump assemblies, accessories, and parts, which in turn guarantee the uniformity and dependability of the pump body. Besides, compatibility with the associated wellbores and rods of the pump has also been considered in the design to meet the standards of global oilfield operations.
| Model specifications | Plunger length (m) | Pump barrel length (m) |
| API 11AX-28 | 0.6-1.2 | 1.5-2.1 |
| API 11AX-56 | 0.9-1.5 | 2.1-3.0 |
| API 11AX-83 | 1.2-2.0 | 2.5-3.5 |
| API 11AX-108 | 1.5-2.5 | 3.0-4.0 |
| Parameter | Description |
| Model | API 11AX Tubing Pump, available in various sizes |
| Pump Diameter Range | 125, 150, 175, 225, 275, 325, 375, 425 mm (common standard diameters) |
| Barrel Length | 6–32 ft (optional), varies with pump diameter |
| Plunger Stroke Range | 4–26 ft (typical design) |
| Tubing Connection Size | 2″, 2 7/8″, 3 1/2″, 4″, etc. |
| Sucker Rod Specification | CYG16 / CYG19 / CYG22 / CYG25 (depends on pump diameter) |
| Pump Constant | 40.948–482.904 d/ft³ (varies with pump diameter) |
This product is fully and accurately manufactured to conform to the dimensional and material specifications for subsurface sucker rod pump assemblies, components, and fittings as specified in API SPEC 11AX. The latest issue of this standard is the 13th Edition including the 2019 Supplement and the 2023 Errata.
The standard clearly requires:
Both pump bodies and internal parts should comply with uniform requirements for geometric dimensions and mechanical properties to guarantee interchangeability and standardization;
It does not cover installation, operation, or maintenance instructions of uniquely designed parts (for such guidelines, please see the API 11AR Recommended Practice).
1. Surface treatment of the pump barrel, plunger, and valve parts could be hard chrome plating, nickel-based alloy spray welding, or carbonitriding to improve their resistance to wear and corrosion.
2. Fully compliant with all the dimensional and specification requirements of the current API 11AX standard, so that oil production equipment worldwide is interchangeable, spare parts etc. by compatibility that will help a rapid replacement and maintenance in the engineering projects.
3. Service life extension with the use of high-strength materials coupled with upgraded surface treatments can significantly lengthen the lifetimes of major pumping components by 1 to 3 times, resulting in fewer repairs and less downtime, and improved operational and economic efficiencies.
The main parts of an API 11AX Tubing Pump are:
1. Pump Barrel
2. Plunger
3. Inlet and Outlet Valve Assemblies
4. Drive Interface and Connecting Rod Components
All these parts are made very precisely, and their sizes are strictly controlled to ensure they meet the API 11AX standards. This guarantees the reliability and efficiency of the downhole pumping system.
Besides, these pumps are perfect choice for:
Traditional and deep-well oil pumping systems
Highly abrasive environments for oil-bearing formations
Oil production equipment that needs API interchangeability standards compliance
Engineering projects where procurement of pump components is done strictly following API specifications
Tieling Dongsheng Petroleum Machinery Co., Ltd. was founded in 2000 and it is situated in Tieling City, Liaoning Province. The firm occupies a facility of more than 20,000 sq.m. and has a solid background of 26 years in the R&D as well as production of petroleum machinery. At present, it employs 96 people of whom 20 are professional engineers and technical staff. The company aims at worldwide distribution of quality oil pumps and other equipment used by oilfields.
Core Certifications: We obtained the American Petroleum Institute (API) 11AX accreditation (Certificate No.: 11AX-0118) and also certified with ISO 14001 Environmental Management System, High-Tech Enterprise certification and Intellectual Property Management System.
Quality Assurance: A comprehensive "Rod Pump Quality Certificate" as well as quality inspection reports may be delivered together with the product. We have a professional physical and chemical laboratory which is well capable of not only Rockwell and Vickers hardness testing but also plunger outer diameter measurement, coating thickness measurement, and more than 45,000 other physical and chemical analyses. Besides, video footage of the inspection process can be provided to clients upon their request.
Our factory is capable of producing 20,000 units (or sets) of petroleum machinery equipment annually, and our extensive customization capabilities allow us to offer OEM/ODM services.
Precision Equipment: CNC lathes, electroplating production lines, long-plunger spray-welding machines, hydraulic straightening machines, honing machines, cylindrical grinding machines, and a specialized tubular processing workshop are among our high-tech equipment.
Technical Advantages: We provide specialized plunger pump solutions for corrosive oil wells and high-precision techniques for manufacturing pump barrels.
Our products have been used extensively in several major domestic and international energy projects, which is why we enjoy a good reputation in the industry:
International Cooperation: We have long-term partnerships with internationally recognized oilfield service companies such as SLB (Schlumberger) and Weatherford, supplying them with customized rod pump solutions. Our products are also exported to the United States, Canada, Romania, India, and Indonesia.
Domestic Market: Among our clients are the main domestic energy companies such as CNPC, Sinopec, ZPEC, and CSSC. We provide our products and services to the oilfields in Liaohe, Daqing, Changqing, and Shengli.
Packaging Standards: For equipment packaging, we use export-grade, heavily reinforced wooden crates to keep the items safe and intact even after long-distance sea and land transport.
Lead Time: The regular time for making and delivering an order is 8–10 weeks.
Shipping Methods: In addition to sea shipping, we are capable of land and combined multimodal transport, covering all the main global ports.
Warranty Commitment: We give our products a quality warranty for a standard period (exact details are decided according to product type). Besides defects, our after-sales technical support can also be relied on for any needs.
Sample Service: If you need samples for testing and evaluation, we can send them to you (you need to pay for the shipping costs).
