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Spool sizes are selected depending on the size and pressure rating of the pipe to optimize the quantity on the spool. The most common spool sizes used are: 144-in. (366-cm) flange with 104-in. (264-cm) core, 168-in. (427-cm) flange with 115-in. (292-cm) core, and 192-in. (488-cm) flange with 115-in. (292-cm) core.
