Expansion joints should be used for pressure pipes of what pressure

It has little to do with stress!

Take a look at the articles of our company's technicians, and you will understand.

When the elongation of the pipe reaches what is the need to add bellows expansion joints?

1.The maximum length of the straight pipe section that is allowed without corrugation compensator is 33m for civil buildings and 42m for industrial buildings. If the pipe diameter is small, (the pipe elongation is 40mm and 50mm, respectively).

The part of the pipeline that can be naturally compensated should be determined first, and the rest is the part where the pipeline compensator should be installed.

2.To calculate the elongation of this part, if a long one is to set up multiple corrugated expansion joints, attention should be paid to the uniform setting; And a fixed bracket is arranged in the middle of the two metal compensators.

3.When choosing, pay attention not only to the model or code, but to provide the manufacturer with detailed data about the pipeline, which is designed and produced by the manufacturer to ensure the service life or quality. Bellows expansion joint is a special pipeline equipment, and it is necessary to choose qualified manufacturers or well-known brand products when purchasing to avoid accidents.

For more information: Hebei Rongsheng pipeline equipment****.

The expansion joint of the pipeline installation has little to do with the pressure of the pipeline, mainly depending on the temperature of the medium, if the temperature of the medium is not much different from the outdoor temperature, it does not need to be installed, if the temperature difference changes greatly, it must be installed.

The use of expansion joints should consider the pressure, temperature, medium, and length of the compensation pipeline, fixing the bracket, and the layout of the guide bracket.

The use of expansion joints has little to do with the pressure of the pipeline, mainly the expansion and contraction of the pipeline when it is subjected to external stress.

Pressure pipeline refers to the working pressure greater than or equal to 1 kg, the original nominal diameter is greater than or equal to 25mm (TSG D0001-2009 Article 2), and now the nominal diameter of the pipeline is greater than or equal to 50mm (GB T Article).

Answer]: B pipeline system pressure test, the pipe wall under pressure, if there is an expansion joint on the pipeline can be drafted, then the tung can be pulled apart, then set up a temporary limb beam device to prevent accidents, after the pressure test is qualified, remove the temporary restraint device. Therefore, choose B.

Answer]: C The test point involved in this question is the use of the compensator. In the ancillary equipment of the gas pipeline network, the compensator is used as a device to eliminate the expansion and contraction stress of the pipe section, and Biyou is often used for the overhead pipeline tracking source and the pipeline that needs to be purged by steam.

The correct answer is: option B.

Answer analysis: When the pipeline system is tested for pressure, the pipeline is subjected to pressure, and the test pressure is greater than the normal operating pressure. If there is an expansion joint on the pipeline, it may be damaged by over-expansion and contraction of the expansion joint beyond the limit range during the pressure test, and a temporary restraint device is required to prevent such accidents.

After the pressure test is qualified, the temporary restraint device should be removed.

c Answer Analysis:

When the piping system is subjected to pressure test, the pipeline is subjected to pressure, and the test pressure is greater than the normal operating pressure. If there is an expansion joint on the pipeline, it may be damaged by the over-expansion of the open ridge of the expansion joint beyond the limit during the pressure test, and a temporary restraint device needs to be set up to prevent such accidents. After the pressure test is qualified, the temporary restraint device should be removed.