Safety valve airtightness

It is generally impossible to determine. However, some companies use a venting method after the safety valve and before the manual valve in order to easily determine whether there is internal leakage in the safety valve. For testing, close the safety valve and open the manual valve to allow air to flow for assessment.

When airtight, it is not required that the safety valve be in use; both the inlet and outlet valves must be opened

This post was last edited by li*nji on 2015-8-8 at 14:16. Please refer to http://wenku.baidu.com/link?url= ... vrpeYkcqH--ZpTzH_nS. As a safety device for pressurized equipment such as pressure vessels, pressure pipelines, and boilers, safety valves must be inspected regularly in accordance with relevant regulations. The regular inspection of safety valves is divided into two types: online inspection and testing, and offline inspection and calibration. Online inspection and testing refers to the inspection and testing of safety valves while they are in operation. The purpose of online testing of safety valves is to quickly and simply determine their set pressure and their partial operation performance, rather than to prove that all their performance characteristics comply with standards and specifications. 1. Principle of online testing: Online testing of safety valves is divided into three methods depending on the source of force that triggers the valve’s operation: testing is carried out using the protected system and its pressure ； Tests were conducted using an auxiliary opening device. ] Online testing of safety valves on offshore oil production facilities generally employs an online testing method that uses auxiliary opening devices for testing. An online tester is an on-line testing device used for testing, calibrating, and setting safety valves; various types of online testers have been developed in China to date.

During calibration, the safety valve has been tested for leaks; external leaks can be detected using airtightness and liquid leak detection methods, while internal leaks are more difficult to detect at this stage

Isn’t it not allowed to operate the safety valve during equipment pressure testing? Our type of equipment operates at low pressure, and steam is generally used for pressure testing; internal leakage can cause an increase in the temperature downstream of the valve. The safety valve can be disconnected at any time to reset the pressure.

Here’s a good suggestion: add a temperature display on the back side of the safety valve; a remote transmission system would be ideal. It’s not possible to determine whether there is an internal leak in the safety valve during pressure testing, but if such a leak occurs during operation, the temperature will be the first indicator of it. Don’t rely on the inspection agencies, as they only deal with adjusting the setting pressure. If there is an internal leak, you’ll need to inform them separately, and it will cost extra money

Safety valves have all been tested for leakage during calibration! If a leak occurs, re-calibration is required

Leak detection when airtight! This inlet side can be pressurized for inspection from the equipment side; the back end is more complicated, as it is necessary to close the boundary valve of the flare main pipe. This valve is too large to operate easily, and once the flare main pipe is pressurized, it is necessary to check the safety valves of each vent However, due to the frequent calibration and disassembly of safety valves, air tightness can no longer be ensured in the long term; it mainly depends on the skill of the workers!