In any Piping material specification first the pipe are specified with their appropriate schedule and other information. In case of the piping components/fittings the schedule/thickness column is sometimes filled with a value of 'M'. What is the meaning of this 'M'?
Does it mean that the schedule of this component/fitting is the same as the schedule of the corresponding size of pipe? or does the 'M' means, that the thickness is medium?
I am confused between these two explanations given by different people. Please help...
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