【Major Equipment in the Chemical Engineering Sector】The low-temperature internal and external pressure cyclic testing of underwater valves from 477 to 2020 was successfully completed, with DNV.GL serving as an observer
Thread Content
The last edit to this post was made by Desert Fish on 2022-8-7 at 10:27. The low-temperature internal and external pressure composite cycle test for underwater valves was successfully completed, with DNV.GL acting as an observer. On November 26, 2020, the Underwater Equipment Laboratory of the Marine Equipment Quality Inspection Center (hereinafter referred to as the “Laboratory”) successfully carried out the low-temperature internal and external pressure composite cycle test on 2-inch hydraulic valves used in shallow-water offshore production trees. This test utilized a low-temperature and high-pressure testing system developed in-house by the laboratory, and was carried out in strict accordance with API SPEC 17D \"Design and Operation of Subsea Production Systems – Subsea Wellhead and Tree Equipment\", under the supervision of DNV.GL.
@Fish in the desert, underwater valves – why are low-temperature tests necessary?
A development project for a gas field complex in China’s South China Sea requires the construction of a new set of subsea manifolds. The main valves in these manifolds are of large size, for which subsea ball valves are generally used, while gate valves are typically chosen for the branch valves in the manifolds. For the underwater manifold branches of this project, 8 sets of 152.4 mm (6 in) underwater gate valves are required, while 2 sets of 203.2 mm (8 in) underwater ball valves are needed for the main pipes. All of these valves operate at a water depth of 142 m, have a design life of 20 years, are rated at PSL 3G, meet the PR2 performance requirements specified in API 6A, use HH grade materials, and have a design temperature range of class P (–29 to +82 °C). The design pressure rating for the underwater gate valves is 41.37 MPa (6,000 psi), and both the underwater gate valves and ball valves are operated using ROVs (underwater robots).
Your in-depth discussions are the best support