B31.1 SV Nozzle Design

Hello all!

I'll try to be brief but would like to introduce myself. I am Bob Goodwin and the Quality Mgr. for a medium size pipe / vessel fabricator in OH. My company decided early on in its history not to be involved in design functions however we are an ASME stamp holder and from time to time I am called upon by necessity to fulfill that function. With that said I sure do need help occasionally but as I have about 23 years experience in the business, I'm sure there will be items I can contribute also.

And now for my current issue. We were awarded a project to fabricate two replacement sections for 18" main steam lines at a local fossil fuel plant. These two straight pieces will be supplied with nozzles for safety valve relocation and are in the B31.1 BEP side of the code break. I originally told our Estimator that we could do this project as I did not know we were going to be responsible for creating the design. I am comfortable with reinforcement and internal pressure calculations however I have been told that the nozzle design must also be adequate for 6000 psi moment of thrust from valve discharge. My two questions are as follows:

1. Will working through the directives of Appendix II provide the solutions I need?
2. I use Computer Eng. products for Sec. VIII calculations however they do not have a product for boiler codes. Would the PipingOffice spreadsheet provide the calculations for external forces?

If anyone would have these answers or can point me to another direction I would be so grateful.

Thanks in advance,
Bob Received on Tue Feb 13 11:15:00 2007