What is the difference between a Safety Relief Valve manufactured to ASME I vs. ASME VIII as far as deign and function?

I want to operate a 900# ANSI valve up to say 2500 psi. This valve is normally limited to 2160 psi case pressure. The valve is WxW in both through conduit and horizontal swing check configurations.

We currently have a pnumatic system, with a solenoid being energized/de-energized at given time intervals.

pnuematic- air operated actuator. The plant needs a reliable source of compressed air, usually a with min pressure of 80 psig at the inlet to the valve positioner.

Knowledge have about material choices for resisting erosion damage from fluids that are also corrosive? Since erosion resistance typically has an inverse relationship to corrosion resistance.

Offer a rule of thumb to estimate the life cycle of steam valves? We are considering substituting A217 WC6 (1-1/4 Cr - 1/2 Mo) for A217 WC9 (2-1/4 Cr - 1/2 Mo)

What differences can I expect in results from running the ISA S75.02 valve capacity tests (compressible - air) under vacuum (e.g. downstream “blowing engines”) versus pressurized (e.g. upstream air

They're trying to rationalize the internal work order program and, whit that, the possible inputs for Customer reference data: Project name, type of Industry, plant Location, Engineering and End-User