I have found in a gas turbine power plant a long run of a 24" pipe supplying water-based fire protection systems supported via cradled non-guided supports, welded to the bottom of the pipe itself. The shoe base plates are placed on support beams, without any slide assemblies in between.
I normally use to design the European code EN 12845, where you can read "supports shall completely surround the pipe and shall not be welded to the pipe or fittings".
Is this permitted in NFPA 13 environments?
I would be glad if you could share your thoughts about this, thanks in advance.
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