Dry Pipe Valve Trip Test: What It Is and Who Performs It

FLOW does not perform dry pipe valve trip tests. A trip test is sprinkler system work, and FLOW does not test or work on sprinkler systems. We test manual standpipes and fire hydrants. This post explains what a trip test is so you know what to ask for, and who to ask. If you are looking for a flow or pressure test on a standpipe or a hydrant, start with standpipe flow tests or fire hydrant flow tests.

What a dry pipe valve trip test is

A dry pipe sprinkler system holds pressurized air or nitrogen in the piping instead of water, which keeps water from freezing in unheated spaces such as warehouses and parking structures. When a sprinkler head opens, the air pressure drops, the dry pipe valve trips, and water flows into the piping. A trip test simulates that sequence on purpose by reducing the air pressure until the valve trips, then checking how the valve and the system respond, including how long water takes to reach the inspector's test connection.

NFPA 25 (2020 edition) covers dry pipe valve testing as part of sprinkler system inspection, testing, and maintenance. The standard sets a partial-flow trip test on a shorter interval and a full-flow trip test on a longer one. Confirm the exact intervals, procedures, and acceptable trip times against the edition your AHJ has adopted.

Who performs it

Trip tests are performed by a licensed fire protection firm that inspects, tests, and maintains sprinkler systems. The work involves the valve trim, air supply, accelerators, and the sprinkler piping itself, which is outside the water-side scope FLOW works in. If your building has a dry pipe system, your sprinkler contractor is the right firm to ask about that test.

What FLOW tests instead

• Manual standpipe flow tests, with the pumper truck pumping into the fire department connection (standpipe flow tests).
• Hydrostatic pressure tests of standpipe piping (hydrostatic pressure tests).
• Fire hydrant flow tests and the annual private hydrant flush (fire hydrant flow tests).
• Flushing of private hydrants and standpipe piping (pipe flushing).

For these tests FLOW provides the field data and produces and sends the test report. If a building has both a standpipe and a sprinkler system, the two jobs can be split: your sprinkler contractor handles the sprinkler side, and FLOW handles the standpipe and hydrant side. Request a quote or contact us to schedule the water-side work.