A contractor in our area was running a hydro test which I failed because the gauge they were using was not labeled for water. I would like some thoughts on this. I know it's not in the code books, but considered the books left it up to the AHJ. Also their gauge was 600 psi which makes it hard to see a 5# change in pressure, I told them they needed 400 psi gauge max. Thanks to all for your reply.
Take a look at NFPA13 2007ed. 8.17.3.3 This section requires that all system gauges be listed. You can require them to use a listed sprinkler gauge for testing. The riser should have a listed gauge on it already. If they have isolated the section they are testing, they should be using a listed gauge in the test rig. You will find that the listed sprinkler gauges do not exceed 300PSI.
The gauge shall also be recently calibrated. You have every right as the AHJ to request gauges that can be accurately read to determine the continuity of the sprinkler system. Also, witness the bleed down of the system to insure the gauge is not broken, locked in at 200 psi, etc. I have had broken gauges used on tests a time or two.
Gauges should be marked for the system your using them on. ie water, air, etc.. They should be UL listed. Gauges, if not calibrated frequently should be replaced annually (Every five years as I was told by a Fire Systems Tech).
