How about the development and application of API standard safety valve? - 1

Release time:

2024-04-09

A: introduce the specification and characteristics of API (American Petroleum Institute) standard safety valve, discuss the research work on performance test and flow field simulation in the development of the product, and put forward suggestions for popularization and application.

(1) The safety valve in our country is designed and manufactured according to the mechanical industry standard. Since the 1970s, with the rapid development of China's reform and opening up and national economy, a large number of petroleum, chemical, energy, metallurgical and textile devices and equipment have been imported from abroad, and a large number of foreign safety valves have been imported at random. Most of these safety valves are designed, manufactured, tested and accepted in accordance with API standards. Compared with JB safety valve, API standard safety valve has obvious characteristics and advancement, so in recent years, some enterprises require that the safety valve installed on the equipment and pipeline with inflammable, explosive, harmful or toxic medium should be selected as API standard safety valve. In order to meet the requirements of various devices for safety valves, the API standard safety valves are discussed and studied.

(2) Characteristics

1) Relevant standards: common standards and specifications related to API standard safety are as follows.

API RP 520 sizing, selection and installation of pressure relief devices in refineries

Part 1 dimensions and selection

Part 2 installation

API Std 526 steel flanged relief valve

API Std 527 tightness of relief valve seat

Inspection of pressure relief device in API RP 576

ASME Boiler and pressure vessel code, Section VIII

Volume I pressure relief device of pressure vessel

ASME PTC 25 pressure relief devices - performance test code

2) Terminology: some terms in API standard are inconsistent with Chinese idioms, so it is explained.

A pressure relief device. The pressure reducing device is to prevent the process system or pressure vessel from exceeding the predetermined pressure value due to the increase of fluid pressure during accident or abnormal working conditions. The common ones are spring loaded pressure reducing valve, pilot operated pressure reducing valve and bursting disc, etc.

B pressure relief valve. The pressure reducing valve is a pressure reducing device. When the system is over pressure, the valve opens. When the system pressure returns to normal, the valve closes, so as to prevent the continuous outflow of medium. Common safety valve, pressure reducing valve, safety relief valve, pilot safety valve, etc.

C safety valve. Safety valve is a kind of pressure relief valve driven by static inlet pressure and characterized by quick opening or sudden jumping. It is applied to compressible fluids.

D relief valve. The pressure reducing valve is a pressure reducing valve driven by the static inlet pressure. Its opening is usually proportional to the pressure rise over the pressure. It shall be used for incompressible fluids.

E safety relief valve. Safety relief valve is a kind of relief valve which is used as safety valve or pressure reducing valve according to the application situation.