I have a few questions regarding the airtightness test of the system that I still haven’t figured out; I’d like to ask everyone for advice

Airtightness checking refers to verifying whether there are any leaks in the system before driving; the pressure is set at its maximum operating level, but this is not a pressure test

Check whether all processes in a system are fully connected, and whether there are any valves that have been accidentally opened, responding with the system being in operational status

Also, after maintenance, check the system’s sealing condition

The design pressure is generally higher than the operating pressure, but during airtightness testing, it is sometimes tested at 1.2 to 1.5 times the design pressure; different pipelines require different testing methods

The pressure resistance testing of pipes involves two methods: hydrostatic testing and pneumatic testing. Depending on the grade of the pipe – GC1/GC2/GC3 – a pressure equal to 1.2 or 1.5 times the design pressure must be applied, and this pressure must be maintained for a certain period of time. . . All of these are stipulated by this special inspection.

First, let’s take a look at which standard you are following According to ASME B31.3 standard, it is roughly as follows: 1. Is the test pressure the design pressure or the maximum operating pressure? If it is the design pressure, then the setting pressure of the safety valve is the design pressure, and in this case the safety valve needs to be removed. If it is the maximum operating pressure, then there is no need to remove the safety valve. The water pressure is 1.5 times the design pressure, and the air pressure is 1.1 times the design pressure. Safety valves belong to the category of instruments and cannot be used in pressure tests. The safety valve installed during pressure testing is not permanent; it is temporary. 2. If the above issues are resolved, a leak test is conducted on the pipes and equipment together; which pressure should be used as the standard—the design pressure or the maximum operating pressure? Article 345.4.3 If pipes and equipment are connected together and the test pressure for the pipes is not higher than that of the equipment, they may be tested together. If the test pressure of the equipment is lower than that of the pipeline, the owner’s signature approval is required; in such cases, the test pressure of the equipment can be used, provided that it is not less than 77% of the pipeline’s test pressure. 3. Do the vent lines and condensate drainage lines need to undergo a gas-tightness test? Both of these systems are connected to the atmosphere in the end, and they have already been tested for strength. Are there any on-site connection ports? If there is, it still needs to be done so as to feel at ease.

This post was last edited by xlxuiin on 2016-12-19 at 10:32. 1. The airtightness test is carried out at the design pressure； The major regulations state that \"a leak test is generally carried out with all safety accessories in place\" (at this time, the set pressure of the safety valve is higher than the design pressure but lower than the maximum allowable operating pressure). 2. Same as 1. 3. Not required

It is a airtightness test, not a pressure test.

Test at the system’s maximum operating pressure.