we are building a hydrotesting chamber, the steel plate will be a sheild wall. if something goes wrong in pressure testing the steel plate should withstand the pressure without deforming, i am stuck in how to calculate the thickness applicable to withstand it. hydrotesting pressure is 25,000 psi , need a formula to calculate this. example if a 20inch material pipe,union,bolt etc, comes direct contact with the plate how much thickness should it be to hold it without leaving the chamber.plate details are below. steel grade : SPHC width(mm) : 1219 -flat plate yield strngth: 249 uts : 346 pressure : 25,000psi holding period : aprrox. 10 min in 2 stages how to calculate what thickness of plate should be used.