3
Pipe Network Installation
This section provides a simple guide to pipe installation and should contain all the information required for simple
installations based on the standard configurations shown in Section 3.9 on page 17.
Use appropriate CPVC pipe with sampling point holes drilled along its length. The pipe run is terminated with an end
cap that may have a sampling hole drilled in its center.
The position of each individual sampling point should be in accordance with the rules for the positioning of point
detectors. It is important to note that the concentration of smoke on an individual sample point will be diluted by the
clean air from the other sampling points.
3.1
Pipe Specification
CVPC Pipes
For compliance, the pipe should have a nominal outer diameter (OD) of 1.05 in. (26.7 mm). The sample pipe is
normally supplied in boxes of 15 ft (4.57 m) lengths and is cut as required and joined by solvent welded sockets
(permanent), or socket unions (removable). Refer to Table 1-1 on page 1 for ordering information.
The pipe shall be orange and be marked with descriptions such as "CAUTION - Smoke detector sampling tube - Do
not disturb" as required by NFPA 72.
Note:
The VPR-SD1 inlet port is tapered to allow a push fit of the sampling pipe. The pipe should be cut squarely to
ensure a good, airtight seal. Solvent adhesive should not be used for this joint. Using adhesive on the inlet
and outlet port connections will void the warranty of the detector enclosure.
Use pipe cutting shears or a wheel type plastic tube cutter to cut pipes to the required length as per the sampling
network design. Ensure that cuts are square.
Flexible Tubes
Flexible tubes may be used in duct applications or in places where conventional pipes cannot be easily installed. It is
recommended that 3/4" (19mm) OD, 1/2" (12.7mm) ID Polyethylene flexible piping is used with an adapter to enable
connection into the inlet port of the detector enclosure. Flexible tubing is available in 50 ft (15 m) and 25 ft (7.5m)
coils. Refer to Section 3.10.1 on page 23 for ordering information.
3.2
Fixings
The normal fixing methods are pipe clips, saddle clamps or even tie wraps. Fixing centers are typically 5 ft (1.5 m)
apart.
Hochiki America Corporation
FireNET Vapor VPR-SD1 Product Guide
www.hochiki.com
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