poorfatjames
Active Member
um...Is the standard 3/8" tube refer to inner or outer diameter?
pfj
pfj
beer4breakfast said:I discovered while shopping at Home Depot that they had tubing that specified the size both ways.
Nate said:I also worked with tubing for over ten years and almost all of it was referenced by OD. Sometimes you'd see some by ID but, generally speaking, tubing was OD and pipe was ID. One reason for referencing tubing by OD is because compression fittings are sized to fit OVER the tubing... the OD is the critical dimension. Piping systems on the other hand, are usually more flow rate critical. Flow calculations are based on the ID size of the pipe therefore making ID the critical dimension.
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