Application of BPV code for pressures exceeding 3000 psi 1

[napalm2007]

I was reviewing section U-1 to understand the range of applicability for the BPV code. I came across the following paragraph:

"U-1(d) The rules of this Division have been formulated on the basis of design principles and construction practices applicable to vessels designed for pressures not exceeding 3000 psi, deviations from and additions to these rules usually are necessary to meet the requirements of design principles and construction practices for these higher pressures."

The question is to what deviations and additions are they refering? In my case I have potential operating pressures of 5000 psi. Is the BPV codes still applicable?

 

[jte]

napalm-

Yes, Section VIII is still applicable. You have your choice of Divisions:
Div. 1: As you noted, additional work and design details may be necessary. This is something you need an experienced PV engineer to sort out. Not unusual to see Div. 2 design details and calc's used with Div. 1 stresses for a Div. 1 vessel where Div. 1 does not provide details or is otherwise not applicable.
Div. 2: Alternate rules which will likely result in a less expensive vessel. This Division will require more engineering and design effort as well as more shop effort on the QA/QC side.
Div. 3: Primarily intended for pressures higher than yours, but you could use this Division. Limited number of engineers and shops familiar with this Division. More restrictions on the materials selection and even more effort on the engineering and design and QA/QC.

jt

 

[vesselguy]

Just off the top of my head but the addition and deviations it refers to, in the case of your > 3000 psi design, are, but not limted to:
1. additional NDE
2. If SPOT RT, then you might want to use the acceptance criteria for FULL RT to accept the indications.
3. impose FEA for design of certain components such as a nozzles and use Div.2 Appendix 4 stress classifications but use Sa for Sm.

just some example. Hope that helped you.