How about the development and application of API standard safety valve? - 2

Release time:

2024-04-11

3) Basic requirements:

A. flow area (code), inlet and outlet diameter, pressure level (pound level), basic materials, pressure temperature range and inlet and outlet installation dimensions of safety valve shall be in accordance with API Std 526.

B. the allowable deviation of the set pressure (P) of the safety valve is related to the set pressure. When p < 0.5MPa, the allowable deviation is ± 0.015MPa; when p > 0.5MPa, the allowable deviation is ± 3% p.

C. The design and manufacture of safety valve shall be in accordance with ASME Boiler and pressure vessel code. Its basic conditions include mechanical action, material selection, inspection of manufacturing and assembly, product test, design, welding and other aspects of the manufacturer and assembly plant.

Such as the requirements for the structural design and material selection of valve disc, valve seat, spring, guide sleeve and lifting device, the requirements for the manufacturing, test equipment and quality control procedures of the manufacturer and assembly plant, such as the requirements for the strength and air tightness test of pressure parts, the requirements for the test device, container and test method, etc.

D. the discharge capacity verification test of pressure relief valve marked with ASME Boiler and pressure vessel code section shall be conducted under the pressure not exceeding 10% of opening pressure or 0.02MPa.

4) Article features:

A rule. API standard has complete and comprehensive basic requirements for structure design, displacement calculation, specification, pressure level, material, manufacturing, test, transportation, installation, use, inspection and maintenance of safety valve.

API RP 520 / 576 introduces the structure and characteristics of various types of safety valves.

Part 1 of API RP 520 lists the calculation method of the required flow channel area under the displacement of various fluid media (gas, water vapor, liquid and two-phase flow), and gives the relevant correction coefficient.

API Std 526 specifies various specifications, pressure levels and basic material requirements for 14 kinds of runner diameters (throat diameters) under different temperatures and pressures, and stipulates that corresponding manufacturing and test requirements of ASME code must be implemented.

API Std 527 specifies the sealing test methods and requirements for pressure reducing valves.

Part I of API RP 520 lists some requirements for installation.

Inspection and maintenance requirements for pressure relief devices are listed in API RP 576.

ASME PTC 25 provides standards for test devices, test methods and test reports of pressure relief devices.

B specification and variety. There are many specifications and varieties of API standard safety valves.

The nominal size of spring loaded safety valve is 1-8in (25-200mm), there are 14 kinds of (DT) channel diameter (d = 69.5-146mm), 25 kinds of specifications, 6 kinds of pound pressure class (150-2500lb °), and temperature range of - 268-538 ℃.