Non standard pipe dimensions 2

[Muud]

On our old water test rig, the SS316L pipelines dimensions seem a bit strange to me. It's an "antique" system so no documentation is available. So I measured the ID & OD using a caliper which came out to be:

OD = 52.32mm
ID = 49.56mm
Thickness (OD - ID) = 2.76mm

From the standard pipe schedule charts, the closest match is DN50 or NPS2 with dimensions as follows:

OD = 60.3mm
SCH 10s Wall thickness = 2.77mm
ID (OD- 2x thickness) = 57.53mm

Apart from wall thickness, the diameters have a big difference. Perhaps it a non standard pipe. However, the non-scheduled sizes that I could find online start from an NPS of 3 inches(80mm).

I need to buy new pipes so I wonder how can I specify the right size as the standard dimension don't match with the existing one?

 

[LittleInch]

I think you need to search for "tubing" rather than pipe. They have a different set of dimension compared to "pipe".

That looks very much like a 2"/ 50mm ID as a standard.

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

 

[TBP]

Anybody working with pipe should have one of these. There are 2 scales on the caliper function - one for nominal steel pipe OD, and the other for actual OD. They resolve SO many discussions...

https://oregonrule.com/orc/product/pipe-caliper-clear-plastic/

 

[EdStainless]

This looks like 2" tube to me. The wall would be 12ga.

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P.E. Metallurgy, consulting work welcomed

 

[Muud]

Yes indeed it matches the 2" tubing dimensions. My earlier understanding of "tubings" was only quite small dia tubes but looks like they exist in much bigger sizes as well. So I wonder what exactly distinguishes the tubing from a pipe? Is it just a matter of different set of standard dimensions? Also is the concept of schedule applicable to tubings as well?


@TBP it looks useful but I don't think they can be used for tubings also.

 

[EdStainless]

Tubing is ordered as OD and wall, with the wall thicknesses usually corresponding to nominal gage thicknesses.
Tube specs are usually stricter than pipe specs in tolerance (wall is +/-10%) and testing.
We make SS tube up through 6" OD (we used to make up to 12"). It is usually lighter wall than pipe also.
Pipe is ordered to nominal pipe sizes and schedules, and then you go look up what size it really is.

= = = = = = = = = = = = = = = = = = = =
P.E. Metallurgy, consulting work welcomed

 

[Muud]

Thanks for explaining the difference