Questions about pressure testing

It was during the airtightness test, right? ? When conducting a gas-tightness test, we usually install the safety valve and the burst disc. There are generally two approaches: one is to set it at a pressure of -0.05 MPa, which is the pressure at which the safety valve activates; the other is to block the outlet of the safety valve with a plug in order to achieve an airtight pressure.

It should be noted that during the airtightness test, the safety accessories should generally be fully installed, as specified in Article 102 of the Pressure Vessel Regulations; the airtightness test pressure is equal to the design pressure. Pneumatic testing is not equipped with safety accessories.

For equipment, the pressure used in the airtightness test is the design pressure of the equipment; the opening pressure of the safety valve should not be higher than the design pressure of the equipment, and the sealing test pressure for the safety valve should be greater than the highest operating pressure of the equipment

When conducting a gas-tightness test on a container, safety valves are generally not installed. For pressure vessels undergoing such tests, Article 102 of the Pressure Vessel Regulations requires that all safety accessories be in place. However, during the explanation of these regulations, it was stated that for pressure vessels equipped with safety accessories, this requirement is not mandatory; in other words, safety valves can be omitted when performing a gas-tightness test on vessels that already have such accessories.

Note that Article 102 of the regulations states “Generally, it should be.” . . ”So we just play it by the rules a little loosely, not following them strictly: lol. But it must be said that writing it this way is inappropriate. This post was last edited by zhjun on 2009-3-6 at 10:06.]

During pressure testing, safety valves and burst discs must be isolated and cannot be used during the test

It seems that a pressure test does not require the installation of all safety accessories such as safety valves

What’s the difference from not having it? It’s just a perfunctory standard

During the pressure test, it is sealed with a blind flange; generally, no safety valve is installed, and one is added after the installation is completed.

During the airtightness test, the safety valve interface on the equipment is sealed with a plug; no safety valve is connected, and the airtightness test pressure is the same as the design pressure； In heat exchangers, when the pressure on the tube side is higher than that on the shell side, only the shell side is subjected to a gas-tightness test. :victory:

Check the regulatory requirements: Article 146 states that when only one safety valve is installed on a fixed-pressure vessel, its opening pressure Pz shall not be greater than the vessel’s design pressure P. Additionally, the sealing test pressure Pt of this safety valve must be greater than the vessel’s maximum operating pressure Pw; that is, Pz ≤ P and Pt > Pw. When multiple safety valves are installed on a fixed-pressure vessel, the opening pressure of one of these valves shall not exceed the vessel’s design pressure, while the opening pressures of the other valves can be increased appropriately, but not beyond 1.05 times the design pressure. In our manufacturing plant, when testing equipment under pressure, we increase the starting pressure by an appropriate amount, to a level not exceeding 1.05 times the normal pressure; this is done to ensure the requirements for equipment pressure testing – first testing at a higher pressure and then determining the design pressure

In our manufacturing plant, when testing equipment under pressure, we increase the starting pressure to a level of 1.05 times or less; this is done to ensure proper testing of the equipment. The testing pressure is determined first, and then the design pressure is considered – in fact, 1.5 times the design pressure is used as the starting pressure!