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Old 04-24-2011, 11:12 AM
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how to measure pipe/tubing

i just wanted to make sure i had this correct
you measure pipe I.D.
and tubing O.D.
and what is electrical conduit considered, pipe or tube??

thanks,matt

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Old 04-24-2011, 12:56 PM
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That's right Matt, and pipe ID is nominal, which means it's close and not necessarily right on size. Tubing should measure within a few thou of its size. I don't know about conduit, sorry.
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Old 04-24-2011, 01:17 PM
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I've got some 1" galv. steel conduit in the shop. Measures 1" ID and about 1.16" OD.
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Old 05-21-2011, 02:30 PM
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Just some additional info:

Pipe is for conveyance (flowing liquids, gases, etc.), so the I.D. is important.

Tubing is for structures- O.D. and wall thickness as needed for weight capacity.

For instance, you might have a pipeline constructed with, uh... pipe that has the proper I.D. and wall thickness for what it's carrying and this pipeline is supported off the ground by a tubing structure that has the needed O.D. and wall thickness to handle the anticipated weight.

Conduit (electrical) is sized by I.D. since the inside volume determines maximum number of wires and their gauge(s) and is considered pipe.
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Old 06-03-2011, 07:50 AM
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Quote:
Originally Posted by qubit
Just some additional info:

Pipe is for conveyance (flowing liquids, gases, etc.), so the I.D. is important.

Tubing is for structures- O.D. and wall thickness as needed for weight capacity.

For instance, you might have a pipeline constructed with, uh... pipe that has the proper I.D. and wall thickness for what it's carrying and this pipeline is supported off the ground by a tubing structure that has the needed O.D. and wall thickness to handle the anticipated weight.

Conduit (electrical) is sized by I.D. since the inside volume determines maximum number of wires and their gauge(s) and is considered pipe.
Not true. Pipe i.d. decreases as wall thickness increases.



Tubing is also for conveyance of materials.
Think copper tubing or stainless tubing for instrumentation or steel tubing for brakelines, etc.
Tubing's O.D. is its size and again it's I.D. decreases with wall thickness.

Structural tubing is used for just that - structure.
Whether round ,rectangular, or square it's O.D.'s are its size.
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Old 06-03-2011, 07:57 AM
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conduit sizes

conduit, EMT Is tubing and has a standard OD. heavy wall conduit has thicker wall but the OD is the same so all the fittings can interchange.
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