Spring loaded safety valves should have a total combined relieving capacity of what percentage of the boiler's max designed capacity?

Spring loaded safety valves are crucial for the safe operation of high-pressure boilers as they are designed to prevent excessive pressure from building up within the boiler system. The correct standard practice is that the total combined relieving capacity of these safety valves should be equal to 100% of the boiler's maximum designed capacity.

This ensures that in the event of an overpressure situation, the safety valves can relieve all the excess pressure that may build up, maintaining the safety of the boiler and preventing potentially hazardous situations such as explosions or equipment failure. A relief capacity that matches the maximum capacity of the boiler ensures that it can handle unexpected increases in pressure without compromising safety.

It is important to note that exceeding 100% capacity might provide an additional safety margin, as in some cases, a margin of 125% is recommended for certain applications, but the standard requirement for general safety is based on the 100% threshold to directly match the maximum designed capacity.