LaserFOCUS VLF-500 Product Guide VESDA
®
16
1.4 Sampling Pipe Network Design
The VESDA LaserFOCUS supports a number of pre-engineered pipe network designs to simplify
installation. The pre-engineered pipe networks have been designed with pressure, flow and
transport time considerations. They have been verified and are shown below. For setup details
refer to the VESDA System Design Manual.
The pre-engineered designs assume the following constraints:
1. There must be no mixing of open hole and capillary tubes in a pipe network design. All
sampling points must be of the same type.
2. All sampling points must be evenly spaced in a pipe network design.
3. Branched designs must use the same number of sampling points along each branch.
4. Open hole designs must use the same size hole throughout the design.
5. Capillary tube designs must use the same size and length of capillary tube throughout the
design.
6. The distance from the detector to the first sampling point must be 1 to 2 times the distance
between sampling points. For example, if the sampling points are 4 meters apart, then the
distance from the detector to the first sampling point must be between 4 and 8 meters.
Given the constraints detailed above, the pre-engineered pipe network designs will provide:
For alternate or complex pipe network designs including end caps with sampling holes use the
ASPIRE2 pipe modeling software to verify pipe performance. For code-specific information, see
Codes and Standards Information for Air Sampling Smoke Detection on page iv.
Parameter Value
Transport times
less than 60 seconds for open holes
less than 90 seconds for capillary tubes
Suction pressure greater than or equal to 25 Pa across holes and capillary tubes
Detector pressure greater than 70 Pa
Flow rate 12 - 24 L/min
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