Regarding the shrinkage of the pipe to be installed
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The operating procedures state that it is necessary to check the contraction of the vertical pipe during shutdown – how do I do this? Can someone teach me?
Generally, for plug valves in a cold state, remember the scale when they are first installed; once the temperature rises to normal levels, note that scale again to see what the difference is.
Compare the scale indicating the fully closed state of the plug valve at the start of operation with the scale indicating its fully closed state after shutdown.