SECTION 4 – SYSTEM DESIGN
UL EX3470 ULC EX3470
PAGE 4-68 REV. 11 2014-SEP-01
R-102 Restaurant Fire Suppression Manual
DISTRIBUTION PIPING REQUIREMENTS (Continued)
Distribution Piping Requirements – 6.0 Gallon Manifolded
System
As an option to piping two 3.0 gallon tanks separately, two 3.0
gallon tanks can be manifolded together to share a common
agent distribution line. Only 3.0 gallon tanks connected to the
same regulator can be manifolded. The following requirements
must be met when manifolding:
1. All piping must be 3/8 in. Schedule 40.
2. See Figure 4-136 for tank connections.
3. The length of supply line piping between the start of the rst
branch line and the start of the last branch line must not
exceed 24 ft (7.3 m). See Figure 4-135. When the supply
line is split, the combined total of both legs of the supply
line (from the start of the rst branch line to the start of the
last branch line) must not exceed 24 ft (7.3 m).
4. The combined length of all branch lines must not exceed
36 ft (10.9 m). See Figure 4-135.
5. A maximum of 22 ow numbers are allowed.
6. The requirements of the following table must not be
exceeded.
FIGURE 4-135
000267
6.0 GALLON SYSTEM
Duct Plenum Appliance
Requirements Supply Line Branch Line Branch Line Branch Line
Pipe Size 3/8 in. 3/8 in. 3/8 in. 3/8 in.
Maximum Length 32 ft 8 ft 4 ft 12 ft
(9.7 m) (2.4 m) (1.2 m) (3.6 m)
Maximum Rise 6 ft 4 ft 2 ft 2 ft
(1.8 m) (1.2 m) (0.6 m) (0.6 m)
Maximum 90° 8 4 4 6
Elbows
Maximum Tees 2 2 2 4
Maximum Flow 22 4 2 4
Numbers
LENGTH OF PIPING MUST NOT EXCEED 24 FT.
(7.3 m) FROM START OF FIRST BRANCH LINE
TO START OF LAST BRANCH LINE
START OF LAST
BRANCH LINE
2W
NOZZLES
1N
NOZZLE
1N
NOZZLE
1N
NOZZLE
1N
NOZZLE
2 FLOW APPLIANCE NOZZLE
(BRANCH LINES IN BOLD)
COMBINED LENGTH MUST NOT EXCEED 36 FT (10.9 m)
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