Reliable Automatic Sprinkler Co., Inc.,
103 Fairview Park Drive, Elmsford, New York 10523
Model DDX-LP N2-Blast
®
PrePaK
™
Low Pressure Dry Pipe System
2” (50mm), 2-1/2” (65mm),
3” (80mm), 4”(100mm)
Bulle
tin 737 January 2021
Bulletin 737 January 2021
Instructions for
Installation, Operation,
Care and Maintenance
Low Pressure Dry Pipe System
8 psi - 24 psi (0.6 bar - 1.7 bar)
System Air/Nitrogen Pressure
General Description
The Reliable Model DDX-LP PrePaK system with integrated
nitrogen generation (Sizes 2” (50mm), 2½” (65 mm), 3” (80
mm) and 4” (100 mm)) is a completely self-contained, super-
vised dry pipe system that can be readily installed within a floor
space of less than 7 ft
2
(0.65 m
2
). Refer to Fig. 1 for cabinet
dimensions. Installation of the DDX-LP PrePaK system requires
just three piping connections: the water supply, the sprinkler
system and the drain. Reference locations of these piping con-
nections are shown in Fig. 1. Independent electrical supplies
are required for the optional system air compressor (115 or 220
VAC) and the nitrogen generator (115 VAC).
Full assembly drawings for the units are available on the Reli-
able Automatic Sprinkler Company website (www.reliablesprin-
kler.com).
The Reliable Model DDX-LP N2-Blast
®
PrePaK system incor-
porates a South-Tek Systems FPS-900 pressure swing adsorp-
tion N2-Blast
®
nitrogen generator, complete with independent
air compressor, nitrogen storage tank, and control system. The
nitrogen generator is completely wired, tested, and integrated
with the Model DDX-LP PrePaK system, and supplies 98% pure
nitrogen to the piping network to limit electrochemical, galvanic,
and micro-biologically influenced corrosion (MIC). Operation
and maintenance information can be found in this bulletin as
well as the South-Tek Systems website (www.southteksystems.
com).
The heart of the Reliable Model DDX-LP PrePaK system is
the Model DDX-LP Dry Pipe Valve. The Reliable Model DDX-
LP Dry Pipe Valve is a hydraulically operated, mechanical valve
designed for use as a primary control valve in a low pressure
dry pipe valve system. The trim set used with the Model DDX-
LP Dry Pipe Valve contains the Reliable Model LP Dry Pilot Ac-
tuator releasing device. This Actuator allows the system air or
nitrogen pressure to be considerably less than the water supply
pressure (see Table A). The following benefits are a direct result
of lower air pressure:
1. In refrigerated area systems, lower air pressure decreases
the possibility of ice plugs that could impede or prevent
the flow of water to fire sprinkler heads in the event of fire.
Note:
N2-Blast
®
and Blast-off
®
are registered trademarks of South-Tek Systems, LLC.
Summary of Contents for N2-Blast DDX-LP PrePaK
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