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Hand hose to be used for fire protection only may be attached to sprinkler pipes. The pipe and valve supplying the hose shall be not less than one inch and not larger than one and one-half inch. The hose shall not be larger than one and one-half inch. The nozzle orifice shall not be larger than one-half inch except that an adjustable spray nozzle may be used. Hand hose shall not be connected to pipe less than two and one-half inches unless the system has been hydraulically designed to include the water discharged from the hose at the point where the hose is connected to the system. Hand hose shall not be connected to a dry system.
(Prior code § 91-26; Amend Coun. J. 10-30-96, p. 31216, § 1)
All piping shall be protected against corrosion. Sprinkler heads located in places where subject to corrosion shall be especially designed or protected against such corrosion.
Where pipe is used underground, the pipe shall be protected against corrosion.
(Prior code § 91-28; Amend Coun. J. 10-30-96, p. 31216, § 1)
A test pipe of not less than one inch diameter, with a smooth bore corrosion resistant outlet giving a flow equivalent to one sprinkler of a type having the smallest orifice installed in the system, shall be provided on wet sprinkler systems. This test pipe shall be connected to the end of the most remote branch line at the highest level of the system. There shall be a separate test pipe for each system. A test valve, which is not exposed to freezing, shall be provided to allow use of the connection.
A test pipe as provided above shall be installed in each dry sprinkler system. The test valve shall be equipped with a brass plug or a nipple and cap.
(Prior code § 91-29; Amend Coun. J. 10-30-96, p. 31216, § 1)
In high-rise buildings the test pipe for a sprinkler system may be placed at the water flow switch or the valve controlling the sprinklers for an individual floor or portion of a floor. The test connection shall be a listed sight test connection utilizing an orifice equivalent to a sprinkler of a type having the smallest orifice used in the system. The test connection shall terminate at a drain capable of accepting full flow of one sprinkler under system pressure.
(Added Coun. J. 10-30-96, p. 31216, § 1)
A dry pipe system shall be permitted only where heat is not adequate to prevent freezing of water in all or sections of a system. If the sprinklers in such unheated spaces are 25 percent or less of the total number of sprinklers required on a system having a total of 100 or more sprinklers, only such 25 percent or less shall be on the dry system and the remainder shall be on the wet system.
The dry pipe system shall be isolated from the water supplies (or from the wet portion of the system, if a combined wet and dry pipe system) by a dry pipe valve located at an accessible point as near as practicable to the dry system, adequately protected against mechanical injury and freezing.
(Prior code § 91-30; Amend Coun. J. 10-30-96, p. 31216, § 1)
No more than 500 sprinklers shall be controlled by one dry pipe valve. The capacities given below for various sizes of pipe shall be used to calculate the capacity of a system.
Capacity Per Foot of Pipe | ||
Diameter | Gallons | |
Schedule 40 | Schedule 10 | |
Capacity Per Foot of Pipe | ||
Diameter | Gallons | |
Schedule 40 | Schedule 10 | |
1 in. | .045 | .049 |
1 1/4 in. | .078 | .085 |
1 1/2 in. | .106 | .115 |
2 in. | .174 | .190 |
2 1/2 in. | .248 | .283 |
3 in. | .383 | .433 |
3 1/2 in. | .513 | .576 |
4 in. | .660 | .740 |
5 in. | 1.040 | 1.144 |
6 in. | 1.501 | 1.649 |
8 in. | 2.66 | 2.776 |
Gridded dry pipe systems shall not be permitted.
(Prior code § 91-31; Amend Coun. J. 10-30-96, p. 31216, § 1)
Dry pipe valves controlling systems having a capacity of more than 500 gallons shall be provided with a quick opening device. The quick opening device shall be located as close as possible to the dry pipe valve while providing protection to the restriction orifice and other operating parts against submergence in water resulting from system drainage or priming. A soft disc globe or angle valve shall be installed in the connection between the dry pipe valve and the quick opening device. A check valve shall be provided also in the connection between quick opening device and the intermediate chamber of the dry pipe valve to prevent the escape of water if the dry valve should trip with the quick opening device disconnected. If the quick opening device requires a pressure feedback from the intermediate chamber, a valve type that will clearly indicate whether it is opened or closed shall be permitted in place of the check valve.
(Prior code § 91-32; Amend Coun. J. 10-30-96, p. 31216, § 1)
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