I have a PCCP pipeline profile drawing showing pipeline pressure class as 100-6, 150-10, etc. I understand the first number is a pressure class. As in 100-6 means 100 psi pipe. But what does the second number mean - 6?
Does anyone have any experience in designing/sizing the control rods for the expansion joints indicated in the picture below? I have zero thrust blocks/anchors in the piping system except where the pipe emerges from the ground on the suction header and goes back below ground on discharge header...