12242-89 Safety Valve Performance Testing Method
Safety valves are components of pressure vessels that are designed to limit or control the pressure within a system. To ensure these safety valves are reliable and meet safety standards, it is important that they undergo performance testing.
In 1989, the Chinese Ministry of Machinery Industry issued the standard GB 12242-89, which details the methods to be used when performance testing safety valves. This document outlines the tests to be conducted, as well as the equipment and processes required to carry out the tests.
The GB 12242-89 standard divides the performance testing of safety valves into three categories. The first is a dimension test, which is used to ascertain whether the safety valve conforms to the specified requirements. This test looks at the basic valve design parameters such as diameter, lift, and dome height. Accurate valve designs are essential for proper operation and safety.
The second category is the pressure lift test. This test is used to measure the opening and closing pressure of the valve, as well as its maximum flow capacity. According to this standard, all valves must be tested at a pressure greater than or equal to the operating pressure. The opening and closing pressures are also tested while the valve is in both the open and closed positions.
The third category is the hydrostatic test. This test is used to check for any leaks in the valve and to ensure that the pressure can be maintained. A safety valve must remain shut at certain levels of pressure, and the hydrostatic test helps to verify this.
In conclusion, GB 12242-89 is a standard which details the methods by which a safety valve should be performance tested to ensure it meets specified requirements and operates correctly. As part of the performance test, the valve is inspected for its dimensions, tested for its lift characteristics, and a hydrostatic test is conducted. These tests help to confirm the reliability and safety of the safety valve.
