6 inch pipe spool heat exchanger U-stamp requirements? 1

[Mawclaw]

Hello!

I usually work with valves and other accessories but have a heat exchanger project that I cannot avoid. Reading through our copy of the ASME codes it seems that a small shell and tube made of 6 inch pipe spool and a single pass tube bundle would not need to be stamped. Is this a correct reading of the scope of section VIII?

The max operating pressure would be 150 PSIG sat. steam (365F) on shell side and city water 50-80 PSI on tube side. Total volume 2.6 gallons.

Would this design be exempt in every state? It also seems to be qualified for a UM stamp. Are there any benefits (other than slight cost saving) of UM over straight U?

Sorry for these basic questions! I usually let subcontractors handle the vessels but in this case it would be nice to just order them from out of the country.

Bonus question! Can a vessel be U-stamped with JIS 10K flanges?


Thanks so much for everyone's time and knowledge!

 

[SnTMan]

Mawclaw, assuming Div. 1, it appears to me you can exempt your vessel based on diameter, per U-1(C)(2)(i), without regard to design or operating conditions.

You'd have to check requirements for each state to confirm exemptions, the NBIC is a place to start.

Bonus question: Yes if they 1) are made from listed material and 2) can by proven by Code calculations, i.e. Appendix 2.

Regards,

Mike

The problem with sloppy work is that the supply FAR EXCEEDS the demand

 

[XL83NL]

I love bonuses!

 

[david339933]

Assuming the 6" pipe is heavier than Sch 40 and little or no CA.

 

[SnTMan]

david339933, agreed, that'd be 6" max in corroded condition.

The problem with sloppy work is that the supply FAR EXCEEDS the demand