Here in our Petroleum Refinery we have some doubts about listed valves (or fittings) on the fire fighting piping systems.
Please according with NFPA updated criteria, which material is recommended for “Fire fighting pipe systems and accessories like gate valves installed at the firefighting pump discharge?.
We have requested valve vendors to provide new valves and all they propose ASTM A536 valves type instead a single Carbon Steel valve. Also we request RF type flanges for install in our existing RF pipes but they only provide FF type flanges.
Please could you explain this more clearly?.