When multiple ASME boilers are connected in parallel, is it necessary to install check valves at the outlets?
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As the title suggests, I saw in the B31.1 specification, as shown in the screenshot, that it seems to be required for all ASME implementations; I’ve never seen such a requirement in China.
According to ASME B31.1 standards, when multiple boilers operate in parallel, a check valve (also known as a non-return valve) is typically installed at the outlet of each boiler. This is done primarily to prevent high-pressure steam or water from flowing back from one boiler to another, especially when one of the boilers is shut down or under maintenance. Check valves ensure the safe operation of the system by preventing accidents and equipment damage caused by the backflow of steam or hot water. Although practices in different countries may vary due to differences in specific design, operating conditions, or historical traditions, according to ASME standards, it is recommended to install check valves when multiple boilers are operated in parallel, in order to meet internationally accepted safety standards. If such practices are not seen in your environment, it may be necessary to discuss further with designers or engineers whether adjustments or improvements should be made in accordance with ASME standards. .
Indeed, I haven’t encountered anyone in my country who does this; it’s probably due to differences.