What is the relief capacity of a safety valve for a low pressure boiler under 30 psig?

The relief capacity of a safety valve for a low pressure boiler under 30 psig is established to ensure adequate protection against overpressure conditions. This capacity is mandated to be set at 20% above the maximum allowable working pressure (MAWP). This means if a boiler is operating at a pressure below 30 psig, the safety valve is designed to open when the pressure exceeds the MAWP by 20%, effectively preventing the boiler from reaching unsafe conditions that could lead to equipment failure or dangerous situations. This standard is crucial for maintaining the safe operation of low pressure boilers and is outlined in regulatory guidelines to ensure consistent and reliable safety measures in the industry.