Spence safety relief valves are also found on commercial and industrial equipment such as steam boilers, pressure reducing stations, unfired steam pressure vessels or lines, and OEM equipment. The handbook was developed for engineers, facility managers and buyers. It includes system design, sizing guidelines, application information, excerpts from ASME Codes I, IV, and VIII, and a safety and relief valve cross reference chart that will allow the user to select the correct safety relief valve for their application.