Dry Back room of Gas Station On riser: Perform a full flood trip test on the dry system. The purpose of completing a trip test for a dry pipe valve, be it a partial test or a full test, it to ensure that the system will operate. The full trip test of a dry pipe system allows for a comparative assessment of the water delivery time that can reveal significant delays in the system operation. NFPA 25 (13.4.5.2.2) Dry pipe valves should be trip tested in the spring to allow time before the onset of cold weather for all water that entered the system or condensation to drain to low points or back to the valve. NFPA 25 (13.4.5.2.2.2) Every three years and whenever the system is altered, the dry pipe valve shall be trip tested with the control valve fully open and the quick-opening device, if provided, in service.