TSG11-2020 5.1.12 Steam boiler safety valves: The exhaust pipes of two separate safety valves must not be connected to each other. ”
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According to \"TSG11-2020 5.1.12\", the exhaust pipes of two independent safety valves on a steam boiler’s safety valve system must not be connected. Does \"independent safety valves\" refer to safety valves with different set pressures? If there are two safety valves with the same pressure setting, does this rule still apply? Or, in cases where originally one safety valve was designed to be primary and the other standby, but now I’ve put both into service; in such cases, the diameter of the outlet piping has been increased. May I connect them together?
According to the provisions of 5.1.12 in TSG11-2020, the exhaust pipes of two independent safety valves shall not be connected. Among them, “independent safety valves” refer to two safety valves installed on the boiler that operate independently; they can be safety valves with different set pressures or safety valves with the same set pressure. Therefore, regardless of the type of safety valves, as long as they are two separate safety valves, their exhaust pipes cannot be connected. Even if both backup safety valves are in use and the diameter of the outlet pipeline has been increased, their exhaust pipes cannot be connected together. .
Well, I asked about the design today, and you are absolutely right – it was also taken into account that there are no manual valves at the outlets of the boiler safety valves; as a result, this makes it impossible to inspect or maintain the other valves as well