Pressure Vessel Pipe Spool 5

[KevinNZ]

A customer is installing a custom pipe spool within a piping system, simple flanged 'spool' as below. Different material (thicker and higher allowable stress) to the piping. The problem is they require the spool to be designed as a pressure vessel (ASME VIII-1) rather than a pipe spool. Now as the piping designer how do we show the 'nozzle'/body loads from the piping are OK to the vessel code? Any shortcuts? Can we just say the piping stress will be higher than the spool and piping calculations are no less conservative than ASME vessel calculations?

The spool/vessel designer is not being supplied any piping loads, so we will not be getting the calculations from them.

Trying our best to convince the customer to change to the piping code and we just include the spool in the piping stress model.

 

[jt1234]

Too bad that you guys are not doing enough or seeing enough. I do agree that this small pipe spool shall be treated as piping code, B31.1 or B31.3. However , it can also be treated as vessel if client insists so, just pay more money to have someone to run the required code calculations. Client is not going to gain any extra benefit by doing so, but they pay the money so keep them happy.
We have so many small pipe with specific internals and service, nothing wrong with Div. 1 as I have said.

 

[Heaviside1925]

jt1234 is 100% correct. There is nothing prohibitive in using XIII for this purpose. All that those quotes communicate, is that there is nothing requiring the use of XIII for this usage, which is the stated purpose of the code as communicated in the paragraph prior.

 

[DekDee]

This is similar to our current project.
Coils for Fired Heaters are specifically excluded from ASME B31.3 but the Contractor is Designing, Fabricating and Inspecting in accordance with B31.3 (with Clients approval)

 

[Christine74]

If you are willing to spend the money you could literally have your kitchen sink be designed, fabricated, and stamped in accordance with ASME Section VIII.


-Christine

 

[r6155]

In similar situations I add in the respective documents "NOTE: By client requirements (client name)"

Regards