VESDA by Xtralis VESDA VLI Product Guide
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4 Pipe Network Design
The Pipe Network should be designed by trained personnel, and verified using the ASPIRE2
software.
4.1 Design Considerations
The following points should be considered when designing a pipe network for the VLI detector:
l The detector requires a minimum total airflow of 40 liters per minute, and a minimum of 20
liters per minute per pipe.
Refer to the VESDA Pipe Network Design Guide for best design practices.
4.2 Installation Considerations
The following points should be considered when installing sampling pipe:
l minimize flexing in sampling pipes by supporting the pipe every 1.5m (5ft) or less, or at a
distance described in local codes and standards.
l evenly arrange the sampling pipe network over return air grilles.
l sampling pipe fits firmly into the tapered detector port, DO NOT glue this connection.
l allow sufficient movement at the detector to permit pipe removal for maintenance.
l keep the exhaust pipe as short as possible to minimize airflow resistance in the pipe.
l pipe ends must be made smooth for bonding.
l sampling holes must be drilled in line and perpendicular to the pipe.
l sample holes must be clear of rough edges and debris.
l pipes are free of debris.
l all joints must be bonded except the endcaps and pipes entering the detector.
Notes:
l In protected areas sampling holes should face into the direction of airflow, or point downwards
in static airflow situations.
l Keep the sampling holes evenly spaced.
l For code-specific information, see Codes and Standards Information for Air Sampling Smoke
Detection on page iii.
Refer to the Pipe Network Installation Guide for best installation practices.
4.3 Inlet Pipes
The VLI detector supports up to four sampling pipes.
The inlets in the pipe inlet manifold are tapered such that they receive both 25 mm (1 in) or IPS 3/4
inch outer diameter pipes.
Each air inlet port allows maximum insertion of the sampling pipe to a depth of 15 mm. (0.60 in). This
prevents the sampling pipes from damaging the flow sensors. While connecting the detector to the
pipe network:
l Ensure a minimum length of 500mm (19.7in) of straight pipe before terminating the pipes at
the air inlet ports of the detector.
l Square off and de-burr the end of the sampling air pipes, ensuring the pipes are free from
debris.
l Determine the Air Inlet Ports to be used. Refer to Table 4-1 below for details.
l Remove the plugs from only those Air Inlet Ports intended for use.
l Insert the pipes into the pipe inlet(s) ensuring a firm fit.
Note: DO NOT glue the inlet pipes to the pipe inlet manifold.
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