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NOTE: This is an unformatted excerpt from our online fire protection training library.

Automatic Sprinkler Inspection, Testing & Maintenance

Dry-pipe valves

Dry-pipe valves require the following additional tests:
The local system waterflow water motor gong must be tested quarterly by flowing water through the alarm test by-pass line to the waterflow alarm.  An electronic flow or pressure switch is tested semi-annually.
The priming water level is tested This test really amounts to a verification that the priming water level is not too high or too low. But, to do the test, the valve on the priming water line must be operated.quarterly by slowly opening the priming water level test valve located at the priming water level as marked And explained in the manufacturer's documentation.on the casting of the dry pipe valve.
Allow water to flow from this priming water level test valve until air begins to discharge, then quickly close the valve.
If air begins to dischage immediately upon opening the priming water level test valve, you will need to add priming water through the priming water cup and chamber until you restore the priming water to the proper level. An annual trip test must be conducted by closing the control valve until it is nearly fully closed. If a QOD is providedAdditionally, the QOD requires a quarterly trip test. The QOD is isolated from the dry pipe valve, and system pressure is bled. Within a couple of psi drop, the QOD should trip. Take the QOD apart peer manufacturers instructions, reset it, and open the system valve to allow the pressure to build in the QOD. Then, open the QOD discharge valve to return it to service., it is tested along with the dry pipe valve.
Bleed This can be done using the inspector's test connection, or any other convenient drain in the system.air from the system until the dry-pipe valve trips.
As soon as the valve trips the control valve is fully closed to prevent water from filling all the piping. Drain out any water that may have entered the piping, remove the cover, inspect the interior of the valve, and, if all is in good order, close the valve and reset it. Once every 3 years the system must be subjected to a full flow trip testThere is one distinct purpose to this test, and, contrary to popular belief, it has nothing to do with "flushing the system out". This is because, when the inspector's test connection is opened, the water takes only one path from the riser to the connection. there will be very little effect on any of the piping not in that path. So, why every three years does the system have to flow water to the test connection?? Time. NFPA 13 requires that the valve trip and water exit the test connection in a set period of time. Every three years, this is measured and recorded to determine if there are any changes in the delivery time. by opening the test connection, tripping the dry-pipe valve, allowing water to fill the system piping, and discharging from the end test connection.  If a QOD is provided, it is tested along with the dry pipe valve. Low air pressure and low enclosure temperature signaling devices, if provided, are required to be tested annuallyThe low temperature switch test is required at the beginning of the heating season.. Once every three (3) years, the dry pipe system has to be tested for air leakage.  This can be done in one of two ways. A two (2) hour pressure test with the system pressure at forty (40) psi.  If the system loses three (3) psi or more, the leaks have to be addressed. With the system at normal pressure, and the compressor or air system shut off, the low pressure alarm cannot activate in the following two (2) hour period.  If the low pressure signal activates, the leaks have to be addressed.   
NOTE: This is an unformatted excerpt from our online fire protection training library.

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