In international surface well-testing terminology, the function shown on this page is normally described as a well-test flowhead or surface test tree. It is installed at the top of a temporary test string, supports the suspended string load and provides well-isolation, flow-wing and kill/circulation paths.
The local catalogue labels “Top-Pull” and “Bottom-Pull” should be treated as configuration identifiers, not literal industry-standard product classes. Confirm the handling/lift sub, swivel, master-valve position, outlet orientation and lower-sub connection from the approved assembly drawing.
Rated working pressure ranges from 6,000 psi (42 MPa) to 15,000 psi. Specifications/models include 2 in, 2½ in, and 3 in, with special specifications available according to field wellhead size and operating requirements. Service conditions include standard and sour service. For sour service, wetted metallic materials must be selected for the stated H2S partial pressure, pH, chloride concentration and temperature in accordance with NACE MR0175/ISO 15156.
In field layouts, the first question is where the component sits in the pressure path and what equipment it must connect to. The answer affects connection direction, pressure class, access for operation and future maintenance.
Key points to confirm
For a well-test flowhead, confirm the following items before quotation, production or replacement.
- Applicable project/product specification and any API Spec 6A requirements for the documented valves or interfaces; do not infer complete-assembly Monogram status from the company license.
- Working pressure, test pressure, nominal size and bore requirement.
- End connection type, mating equipment, flow direction and installation space.
- Service condition: standard, low-temperature or sour service; for sour service, provide the environmental limits needed for NACE MR0175/ISO 15156 material selection.
- Required documents such as MTC, pressure test report, NDT report and third-party inspection.
Field use and inspection
The flowhead must be assessed as part of the complete surface well-test string. Verify suspended load, pressure, temperature, bending load and connection compatibility; protect sealing surfaces and do not force the assembly into alignment. Record any leakage, abnormal valve operation or pressure-test instability for engineering review.
Information for quotation
For new projects, provide the well-test string arrangement, suspended load, working pressure, medium, temperature, outlet and lower-sub connections, valve actuation and documentation requirements. For replacement work, supply the existing nameplate, body markings, connection details and approved arrangement drawing.