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VESDA by Xtralis
3
Air Sampling Pipe Network
The detector uses two linear pipes of up to 6 m (20 ft) or two branched pipes of up to 9 m (30ft) to cover a
maximum of 100 m² (1000 ft²). Short pipes can be used to suit the installation.
3.1
Installation Considerations
The following points should be considered when installing sampling pipe:
Minimize flexing in sampling pipes by supporting the pipe every 1.5 m (5 ft) or less, or at a distance
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described in local codes and standards.
Sampling pipe fits firmly into the tapered detector port, DO NOT glue this connection.
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Allow sufficient movement at the detector to permit pipe removal for maintenance.
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Pipe ends must be made smooth for bonding.
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Sampling holes must be drilled in line and perpendicular to the pipe.
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Sample holes must be clear of rough edges and debris.
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Ensure that all sampling holes are from within a single space (not physically different areas separated by
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walls).
Ensure that there is no pressure differential between sampling holes and exhaust ports.
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Pipes are free of debris.
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All joints must be glued except the pipes entering the detector.
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Notes:
Sampling holes should face into the direction of airflow, or point downwards in static airflow situations.
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For return air sampling refer to the notes in Section 3.4 on page 12.
For code-specific information, see Codes and Standards Information for Air Sampling Smoke Detection
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on page iii.
3.2
Pipe Inlets
The VESDA VLQ detector supports two sampling pipes. Both pipes must be connected for proper detector
operation.
The air inlet ports are tapered such that they accommodate both 25 mm (1 in) or IPS ¾ inch (1.05 in outer
diameter) pipes. Each air inlet port allows maximum insertion of the sampling pipe to a depth of 15 mm (0.60
in).
While connecting the detector to the pipe network:
Square off and de-burr the end of the sampling air pipes, ensuring the pipes are free from debris.
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Insert the pipes into the pipe inlet(s) ensuring a firm fit.
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Note:
DO NOT glue the pipes to the pipe inlets.
3.3
Exhaust Air
Air is expelled from the detector via the filter and after the detection chamber into the area where the detector
is located. Refer to Figure 2-2 on page 6.
There should be no pressure differential between the sampling holes and the exhaust ports.
www.xtralis.com
VESDA VLQ Product Guide
11
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