This article is written for API 6A Studded Adapter Flange used in oilfield API 6A high-pressure flowline, wellhead and manifold service. The product should be confirmed by its real oilfield service position, not only by a short catalogue name. For API oilfield equipment, the useful specification combines pressure rating, nominal size, end connection, service condition, material or seal requirements, and inspection documents.
The API 6A studded adapter flange, also known as a studded integral adapter, is mainly used for assembly and connection of high-pressure manifolds and related high-pressure flow-control equipment. It is an important pressure-containing connection component in pup joint systems. Available structural forms include API 6A Flanged Adapter, API 6A Flanged Tee, API 6A Flanged Cross, and API 6A Flanged Five-Way Cross. Specifications range from 2 1/16" to 5 1/8", and rated working pressure ranges from 5,000 psi (35 MPa) to 15,000 psi. It is suitable for standard-temperature, low-temperature, and H₂S service environments.
Products are manufactured strictly according to API Spec 6A, with Material Class EE. The adapter blank is forged from alloy steel, and sealing grooves are precision-machined by CNC equipment for reliable sealing performance. Specification dimensions at each connection end can be customized according to field manifold systems and matching requirements.
Engineering, purchasing and field teams should confirm the same technical information before production. This avoids repeated clarification and reduces the risk of supplying a part that cannot be installed.
Key points to confirm
For API 6A Studded Adapter Flange, we normally recommend confirming the following items before quotation, production or replacement.
- Applicable standard or project requirement: API 6A.
- Working pressure, test pressure, nominal size and bore requirement.
- End connection type, mating equipment, flow direction and installation space.
- Service condition such as standard service, NACE sour service or low-temperature service.
- Required documents such as MTC, pressure test report, NDT report and third-party inspection.
Field use and inspection
API 6A Studded Adapter Flange should be checked as part of the complete high-pressure system. Sealing surfaces must be protected, connections should be clean before make-up, and the product should not be forced into alignment by side load, hammering or pulling. If leakage, abnormal operation or pressure-test instability occurs, the model, pressure, medium, photos and test conditions should be recorded for technical review.
Information for quotation
For new projects, please provide the line layout, operating pressure, medium, temperature, connection standard and document requirements. For replacement work, old-part photos, nameplate or body markings, end-connection close-ups and installation position help us confirm the correct API 6A Studded Adapter Flange quickly.