How about the development and application of API standard safety valve? - 3

Release time:

2024-04-13

The nominal size of the pilot safety valve is 1-8in (25-200mm). There are 14 kinds of (DT) channel diameter (d = 69.5-146mm), 21 kinds of specifications, 6 kinds of pound pressure class (150-2500lb), and temperature range of - 268-260 ℃.

There are many specifications and varieties of API standard safety valves, so it is convenient to select safety valves with reasonable specifications.

C temperature pressure stage. API standard safety valve determines the flow passage area according to the required displacement calculation, and then determines the appropriate pressure level according to the temperature range corresponding to the flow passage area and the maximum allowable set pressure.

D material. The valve disc, valve seat and guide parts shall be made of corrosion-resistant materials and meet the temperature and service conditions. Select suitable valve body, bonnet and spring materials according to applicable temperature. Body and bonnet materials may be different, but must meet the minimum pressure temperature requirements. The minimum grades of valve body, bonnet and spring materials are specified in the standard.

E manufacturer and test device requirements. The process equipment, test equipment and quality control procedures of the manufacturer can ensure the performance consistency of the safety valve produced. Safety valve performance test device and container shall be of sufficient size and capacity.

F transportation and installation. The safety valve shall be provided with a protective cover (plug) during transportation. Pressure loss of the inlet pipe of the safety valve △ P ≤ 3% p

(3) There are many problems in the process of product manufacturing due to the differences between the production of safety valve according to API standard and the production of safety valve according to JB. For example, the structure design is unreasonable, the material selection is improper, the setting pressure is too high or the actual discharge does not meet the requirements.

In order to fully understand, be familiar with and master the relevant contents and requirements of API standard (ASME Code), it is necessary to conduct in-depth study on API standard safety valve to show its characteristics and advancement. The main research of API standard safety valve includes experimental research and modeling research.

1) Performance test study:

A test device. In order to test and study the performance and displacement of safety valve, the full performance test device of safety valve is built according to the requirements of ASME PTC 25 pressure relief device performance test code. The test device is mainly composed of large flow air compressor, air storage tank, flow regulating valve, control valve, test vessel and station, flowmeter, pressure sensor, temperature sensor, displacement sensor, computer data acquisition and processing system, etc.

There are three test stations in the test device. The maximum test valve diameter is bin (200mm), the maximum test pressure is 23mpa, and the maximum test flow is 100t / h (air). The volume of the test vessel in the test station is 4.5m3, 1.5m3 and 0.014 m3 respectively

In order to better compare the effect of the capacity of the test device on the performance of the safety valve, a test device with a volume of 0.5m was built.