fully with the fitting and must not be too long nor too short.
All screwed joints must be made with best quality hemp and
graphite compound. Flanged joints must be machine faced
and ground or made with graphited asbestos jointing gaskets
or rings. Some welding of joints on heating mains in trenches
and in the boiler room, pump room and other fully accessible
positions will be allowed where this method will benefit the
installation without jeopardising the easy renewal of sections
of the pipework during future maintenance work. Welded
joints will be allowed when indicated in the Supplementary
Specification.
Valves ...
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