13-56 INSTALLATION OF SPRINKLER SYSTEMS
N 8-2-3-6-3 Calculations of water delivery time shall be based on 8.2.4.2 The quick-opening device shall be located as close as
the time interval between the following: practical to the dry pipe valve.
(1) Calculated point in time when the selected most remote 8.2.4.3 To protect the restriction orifice and other operating
sprinkler(s) open parts of the quick-opening device against submergence, the
(2) Calculated point in time when pressure at the most connection to the riser shall be above the point at which water
remote sprinkler reaches or surpasses and maintains the (priming water and back drainage) is expected when the dry
design pressure pipe valve and quick-opening device are set, except where
8.2.3.6.4 For dry pipe systems protecting dwelling unit design features of the particular quick-opening device make
portions of any occupancy, the sprinklers in the dwelling unit these requirements unnecessary.
shall have a maximum water delivery time of 15 seconds to the 8.2.4.4 Where a valve is installed in the connection between a
single most remote sprinkler. dry pipe sprinkler riser and a quick-opening device, it shall be
� 8.2.3. 7* Manifold Test Connection.
an indicating-type valve that is sealed, locked, or electrically
supervised in the open position.
N 8.2.3.7.1 System size shall be such that initial water discharge 8.2.4.5 A check valve shall be installed between the quick
from the system trip test connection or manifold outlets is not opening device and the intermediate chamber of the dry pipe
more than the maximum time of water delivery specified in valve, where the quick-opening device requires protection
Table 8.2.3.6.1, starting at normal air pressure on the system against submergence after system operation.
and at the time of fully opened test connection.
8.2.4.6 If the quick-opening device requires pressure feedback
8.2.3.7.2 When flow is from four sprinklers, the test manifold
shall be arranged to simulate two sprinklers on the most from the intermediate chamber, a valve type that will clearly
remote sprinkler branch line and two sprinklers on the next indicate whether it is opened or closed shall be permitted in
adjacent branch line. place of that check valve.
8.2.4.7 Where a valve is utilized in accordance with 8.2.4.6, the
8.2.3.7.3 When flow is from three sprinklers, the test manifold
shall be arranged to simulate two sprinklers on the most valve shall be constructed so that it can be locked or sealed in
remote branch line and one sprinkler on the next adjacent the open position.
branch line. 8.2.4.8 Antiflooding Device.
8.2.3.7.4 When flow is from two sprinklers, the test manifold 8.2.4.8.1 Unless the requirements of 8.2.4.8.2 are met, a listed
shall be arranged to simulate two sprinklers on the most antiflooding device shall be installed in the connection
remote branch line. between the dry pipe sprinkler riser and the quick-opening
8.2.3.7.5 When flow is from one sprinkler, the test manifold
device.
shall be installed as per the requirements for a trip test connec 8.2.4.8.2 A listed antiflooding device shall not be required
tion in accordance with 16.14.2. where the quick-opening device has built-in antiflooding
8.2.3.7.6 A system meeting the requirements of this section
design features or the quick-opening device is listed or
shall not be required to also meet the requirements of 8.2.3.2 approved without the use of an antiflooding device.
or 8.2.3.5. 8.2.5* Location and Protection of Dry Pipe Valve.
8.2.3.8 Dry pipe systems with water delivery times other than 8.2.5.1 * General. The dry pipe valve and supply pipe shall be
8.2.3.2, 8.2.3.5, and 8.2.3.7 shall be acceptable where listed by a protected against freezing and mechanical injury.
nationally recognized testing laboratory. 8.2.5.2 Valve Rooms.
8.2.3.9 Dry Pipe System Subdivision. Unless installed in a
heated enclosure, check valves shall not be used to subdivide 8.2.5.2.1Valve rooms shall be lighted and heated.
the dry pipe systems. 8.2.5.2.2 The source of heat shall be of a permanently instal
8.2.3.9.1 When check valves are used to subdivide dry pipe led type.
systems in accordance with 8.2.3.9, a hole Ys in. (3 mm) in 8.2.5.2.3 Heat tape shall not be used in lieu of heated valve
diameter shall be drilled in the clapper of each check valve to enclosures to protect the dry pipe valve and supply pipe against
permit equalization of air pressure among the various parts of freezing.
the system.
8.2.5.3 Supply. The supply for the sprinkler in the dry pipe
8.2.3.9.2 Where auxiliary drains are not provided for each valve enclosure shall be either from the dry side of the system
subdivided section, an approved indicating drain valve super or from a wet pipe sprinkler system that protects the area
vised in the closed position in accordance with 16.9.3.3, where the dry pipe valve is located.
connected to a bypass around each check valve, shall be provi
ded as a means for draining the system. 8.2.5.4 High Water Level Protection.
8.2.3. 10 Gridded dry pipe systems shall not be installed. 8.2.5.4.1 Where it is possible to reseat the dry valve after actua
8.2.4 Quick-Opening Devices.
tion without first draining the system, a high water level device
in accordance with 8.2.5.4.3 shall be provided.
8.2.4.1 A listed quick-opening device shall be permitted to 8.2.5.4.2 Differential Dry Pipe Valve. Protection against accu
help meet the requirements of 8.2.3.2, 8.2.3.5, 8.2.3.7, or mulation of water above the clapper shall be provided for
8.2.3.8. differential dry pipe valves in accordance with 8.2.5.4.3.
2022 Edition Shaded text = Revisions. Ll = Text deletions and figure/table revisions. • = Section deletions. N = New material.
