Potter Releasing Systems - Manual (Page 43)

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Quarterly be investigated immediately to determine its cause. The effect that the
(continued) drop in pressure will have on the sprinkler system operation should also be
determined to assure that the system will perform satisfactorily.
Wet Pipe System:
Test water flow alarms.
Test alarms by opening the inspector’s test connection. This simulates
the flow of water from one sprinkler head and will activate the water
motor alarm as well as the flow switch or pressure switch. (When freezing
weather prohibits using the inspector’s test, the alarm by-pass connection can
be used. However, use of the alarm by-pass does not test the operation
of the valve clapper and is not considered as good a test as using the
inspector’s test connection.)
Dry Pipe System:
Test low air pressure alarm.
This test is conducted as follows:
1. Close the water supply valve so the system will not be accidentally
tripped.
2. Slowly release air from the system by gently opening the inspector’s
test valve.
3. The low air pressure alarm should sound when the pressure drops to that
recommended by the manufacturer. Do not allow pressure to drop
sufficiently to trip the dry pipe valve.
4. After the test, make sure that the air supply valve is open and that the
system air pressure has returned to normal, then reopen the water
supply valve.
Test water flow alarm.
Open the alarm by-pass valve. Use of the inspector’s test connection is
not desirable as it will cause the dry pipe valve to trip.
Semi-Annually Deluge Sprinkler System:
Test the fire detection system for proper operation. See Chapter 1 for
additional information.
Preaction Sprinkler System:
Test the fire detection system for proper operation. See Chapter 1 for
additional information.
Annually Wet Pipe Sprinkler Systems:
Test the freezing point of antifreeze solutions if used. This is done by
measuring the specific gravity with a hydrometer. (Refer to Tables 2-2a
and 2-2b on pages 35 and 36 for typical hydrometer readings.) Adjust the
solution as necessary to maintain the freezing point of the solution below
the estimated minimum temperature.
Dry Pipe Sprinkler Systems:
Trip test the dry pipe valve.
Before the trip test, the main drain valve should be fully opened and
the water supply flushed out until the water flows clean. If a hydrant is
located on the system supply, it should be flushed before the main drain
is flushed. This flushing will help to reduce the amount of debris getting
into the dry pipe system. Each dry pipe valve, including
quick opening devices if provided, should be trip tested. This test should