What is the maximum inlet size of a welded or flanged PSV?

The maximum inlet size of a welded or flanged Pressure Safety Valve (PSV) is defined by industry standards, which typically limit the sizes for practical and safety reasons. A flanged or welded PSV can effectively handle pressures and flow rates that larger valves could not, making the specifications critical for their application.

In this context, 4.5 inches serves as a commonly accepted maximum size for some welded or flanged PSVs in many codes and regulations, such as those outlined by standards bodies like the American Society of Mechanical Engineers (ASME). This size ensures that the valve can adequately perform its function of relieving excess pressure from the system while maintaining reliability and safety.

Options that exceed this measurement do not align with the typical standards for welded or flanged PSVs, as they would necessitate different construction and operational considerations. Thus, 4.5 inches solidly meets the requirements laid out in guidelines governing the construction and use of PSVs, making it the appropriate choice in this scenario.