E Safety Pressure Relief Valves

Section 215 Section 215.TABLE E  Safety Pressure Relief Valves a)         The rate of discharge shall be stamped on the safety relief valve in cubic feet of air per minute at: 1)         60 degrees F., 2)         14.7 pounds per square inch absolute, and 3)         120 percent of the stamped start-to-discharge setting. b)         Safety pressure relief valves in systems utilizing air compressors for the transfer of nitrogen fertilizer solutions shall have a minimum rate of discharge in cubic feet per minute of air of 120 percent of the compressor manufacturer's maximum rated capacity. c)         Safety pressure relief valves in systems utilizing pumps for transfer of nitrogen fertilizer solutions shall have a minimum rate of discharge of 120 percent of the liquid inflow rate.  This can be computed as follows:  Liquid pump maximum rated capacity in GPM times 0.16 equals vapor flow in CFM.