What is a key difference between low pressure and high pressure safety relief valves?

A key difference between low pressure and high pressure safety relief valves is the method by which they discharge excess pressure. Low pressure safety relief valves are designed to relieve pressure by discharging to a drain, which helps to safely manage any liquid that may be present in low-pressure systems. This is often necessary in processes where the fluid being handled can be harmful or needs to be collected for reprocessing.

In contrast, high pressure safety relief valves are typically designed to vent to the atmosphere, which allows steam or gas to escape safely into the air. This is essential in high pressure systems where the release of gases is common, and venting to the atmosphere provides a way to handle steam or vapor without risking contamination or handling challenges.

Recognizing this difference is crucial for ensuring safe operation in various boiler systems, as using the incorrect type of relief valve could lead to dangerous situations such as overpressure conditions or equipment failure. The design and application of the safety relief valve are fundamental in maintaining safety and compliance with industry standards.