pipe on the plan. Other line symbols identify thehave smaller inside diameters because their wallproposed use of the pipes. The size of the requiredthickness is greater. Piping over 12 in. in diameterpiping should also be noted alongside each routeis referred to by its outside diameter (O.D.).of the plan. Piping up to 12 in. in diameter isreferred to by its nominal size, which isFitting Symbolsapproximately equal to the inside diameter (I.D.).The exact inside diameter depends on theThe pipe-fitting symbols shown in figure 8-29classification of the pipe. Heavy types of pipingare the basic line symbols used for pipes, inFigure 8-29.-Pipe-fitting symbols.8-22
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