Hi,

I have to calculate an FRP piping system as per B31.3

I have LTHS = 147 Mp

For UKOOA code the allowable stress is:

Hoop Stress: LTHS x f1

As B31.3 chapter VII A302.3.3 for FRP pipes the allowable stress for sustained case is given in ASTM D3839 or Appendix A of AWWA C950.

I checked the astm D3839 but I didn't find nothing about HDB or LTHS
I have the AWWA C950 but without APPENDIX A

Any one can tell me how to calculate the allowable stress for FRP pipe as per B31.3 using LTHS???

Best regards,