The re-rating for an operating temperature at 85 C (185 F) for 3-inch SCH 80 370 psi at 73f/23c 45WA 9102  2M FS10  SD25  ASTM F441 19914 POTABLE NSF-- which is a CPVC material is approximately 90 psig. Use of the proposed pipe at 85 C and 100 psig would be above its rated pressure.