HX tube min thickness
HX tube min thickness
(OP)
Good day all,
Currently I have a heat exchanger which heats incoming air (via straight finned tubes) using steam.
Tubeside on steam, and air on the shellside.
Looking at the design code, it is designed to ASME 8 Div.1 for which the tube is specified as 1 inch and 1/16" thick.
Now for the design of 75 psi and 600F, this thickness should be sufficient for the carbon steel tubes however my knowledge of the code would indicate that for air/steam service the min. thickness of the tube should be 3/32 (0.094) inches.
Strangely now if this is correct, then my exchanger should not have a U stamp as it currently does.
Am I correct in my interpretation of the code wrt to this ?
[Note that the drawings do not indicate TEMA or similar]
Currently I have a heat exchanger which heats incoming air (via straight finned tubes) using steam.
Tubeside on steam, and air on the shellside.
Looking at the design code, it is designed to ASME 8 Div.1 for which the tube is specified as 1 inch and 1/16" thick.
Now for the design of 75 psi and 600F, this thickness should be sufficient for the carbon steel tubes however my knowledge of the code would indicate that for air/steam service the min. thickness of the tube should be 3/32 (0.094) inches.
Strangely now if this is correct, then my exchanger should not have a U stamp as it currently does.
Am I correct in my interpretation of the code wrt to this ?
[Note that the drawings do not indicate TEMA or similar]





RE: HX tube min thickness
RE: HX tube min thickness
Why would you say that?
Regards,
Mike
The problem with sloppy work is that the supply FAR EXCEEDS the demand
RE: HX tube min thickness
This is what I was reading as follows:
Which I took to mean that the thickness should be a min of 3/32 inches.
I was under the impression that if the thickness isn't the minimum code [the U-1A form also has completely different nominal thickness as well], then it would not be an ASME designed vessel. Unless the U-stamp is different (my knowledge on these things is a bit limited, trying to learn/understand better here).
RE: HX tube min thickness
For various services and materials there are sometimes minimum wall thickness requirements.
Get to know the Code.
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P.E. Metallurgy, Plymouth Tube
RE: HX tube min thickness
Is it correct to then say that a shell is not the same as tube ? (As I have seen the shells under internal pressure used to calculate "tubes under internal pressure")
RE: HX tube min thickness
RE: HX tube min thickness