Can expansion joints be installed on steam pipelines?

It is said that steam pipelines using expansion joints are prone to leakage

It can be used. Stainless steel bellows expansion joints are commonly used

An expansion joint is a device used to absorb the thermal expansion and contraction of piping systems caused by thermal stress. During normal operation, steam pipelines are affected by temperature changes. Therefore, installing expansion joints can effectively reduce the stress caused by thermal expansion in the piping system and ensure its safety. However, whether expansion joints are needed on the steam pipeline must be determined based on specific circumstances. Based on the situation you described, the steam pipeline has a large diameter, there is limited space in the existing pipe tray, and the thermal stress is high; these factors can lead to significant thermal expansion issues in the piping system. If the issue of thermal expansion is not taken into account during the design of a piping system, it may result in stresses within the system exceeding the designed limits, thereby posing a potential threat to the safety of the piping system. Therefore, in this case, in accordance with relevant codes and standards, it is recommended that you consider designing a proper expansion joint scheme to reduce the stress on the piping system and enhance its safety. Ultimately, whether or not to install expansion joints requires reference to relevant codes and standards, as well as a comprehensive evaluation and decision-making based on the specific circumstances. It is recommended that you consult relevant professionals based on the specific circumstances to ensure the safety and reliability of the steam pipeline system. .

The π-type expansion joints installed on the pipe tray for our company’s steam pipelines have not shown any signs of leakage so far

A slewing compensator can be installed to handle high stress.

Bellows expansion joints pose a risk of leakage; it is recommended to use π-type expansion joints or rotary compensators instead

Most commonly, U-shaped bends are installed at regular intervals along the steam pipeline tray, with the pipes bent parallel to each other, and the pipe supports in the straight sections are sliding supports. For details, see GB/T 16749-2018

Given that the space available in the existing pipe gallery is no longer sufficient, it is recommended to install pipe supports or separate pipe racks on the ground to support the steam pipelines. In this way, the thermal stress issue you mentioned should not have an impact on the existing pipe gallery. I would appreciate some guidance regarding why the bellows expansion joints mentioned by the following speakers carry a risk of leakage. Additionally, can π-type expansion joints or rotary compensators completely replace bellows expansion joints? What are their respective advantages and disadvantages?

It is quite common to install bellows expansion joints in steam pipelines.