Pipe Network Design And Installation; Design Considerations; Installation Considerations; Pipe Inlets - VESDA -E VES-A00-P Product Manual

3

Pipe Network Design and Installation

The Pipe Network should be designed by trained personnel, and verified using the ASPIRE software.
3.1

Design Considerations

The following points should be considered when designing a pipe network for the VES-A00-P detector:
At all times the detector requires a minimum total airflow of 20 liters per minute, and 15 liters per minute
l
per pipe for multi-pipe systems. It is highly recommended that pipe flows be set to at least 20% higher
than required minimums.
For other than single pipe installations, it is preferred to use a total detector flow rate of at least 50 l/min.
l
Verify the design using the ASPIRE software. If required, use higher aspirator speed setting to meet this
limit.
For single pipe installations, the pipe flow rate should be at least 40 liters per minute. Verify the design
l
using the ASPIRE software. If required, use a higher aspirator speed setting to meet this limit.
Avoid using exhaust pipes unless there is a substantial pressure differential between the detector and the
l
area being sampled by the pipe network. In this case the exhaust pipe needs to go back to the sampled
area. Refer to Section 3.4. for further information.
Refer to the VESDA Pipe Network Design Guide for best design practices.
3.2

Installation Considerations

The following points should be considered when installing sampling pipe:
Minimize flexing in sampling pipes by supporting the pipe every 1.5m (5ft) or less, or at a distance
l
described in local codes and standards.
Evenly arrange the sampling pipe network over return air grilles.
l
The 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
Sampling holes must be clear of rough edges and debris.
l
Pipes are free of debris.
l
All joints must be bonded except the end caps and pipes entering the detector.
l
Notes:
Sampling holes should be angled between 30° and 45° into the direction of airflow, or point downwards in
l
static airflow situations.
Keep the sampling holes evenly spaced.
l
For code-specific information, see Codes and Standards Information for Air Sampling Smoke Detection
l
on page iii.
Refer to the VESDA Pipe Network Installation Guide for best installation practices.
3.3

Pipe Inlets

The air inlet ports in the pipe inlet manifold are tapered such that they accommodate both 25 mm OD pipe or
IPS 3/4 inch pipe (1.05 inch OD).
Each air inlet port allows maximum insertion of the sampling pipe to a depth of 23mm for 25 mm OD pipe or
11.5mm for IPS 3/4 inch pipe (1.05 inch OD). While connecting the detector to the pipe network:
Ensure a minimum length of 500 mm (20 in) of straight pipe before terminating the pipes at the air inlet
l
ports of the detector.
Square off and de-burr the end of the sampling air pipes, ensuring the pipes are free from debris.
l
Determine the pipe inlet ports to be used. Refer to Table 3-1 below for details.
l
Remove the plugs from only those pipe inlet ports intended for use. To remove the plug, place a large
l
www.xtralis.com
VESDA-E VES-A00-P Product Guide
15