VESDA VLF-500 Product Guide VESDA by Xtralis
20 www.xtralis.com
3.1 Single Pipe Network
The table below shows the appropriate hole sizes for pre-engineered designs for a single pipe set up.
Single Pipe Network – max. length 50 m (150 ft.)
Sampling
holes
ID 21 mm Pipe IPS ¾ in. Pipe
Open Hole Open Hole 5.2
mm Capillary*
with 5 mm hole
Open Hole 3/8 inch
Capillary* with
1/8 inch hole
Hole Size (mm) Length (m) Hole Size (in.) Length (ft.)
5 4.0 – 5.0 0 – 1.8 0 – 12
6 3.5 – 4.5 0.3 – 1.8 0 – 12
7 3.5 – 4.0 0.5 – 2.0 0 – 12
8 3.5 – 4.0 0.8 – 2.2 0 – 12
9-24* Use ASPIRE to calculate hole sizes in this range*
Table 3-1: Single pipe hole numbers and sizes
*For code-specific information, refer to Codes and Standards Information for Air Sampling Smoke Detection on page iii.
The set up below shows a single pipe arrangement with 4 sampling holes and a fitted end cap without a
sampling hole.
Legend
A Smoke Detector B Sampling Hole C End cap (no hole)
Figure 3-1: Open hole, single pipe
The set up below shows a single pipe arrangement with 6 capillary drop pipes and a fitted end cap without a
sampling hole.
Legend
A Smoke Detector B Capillary Tube C End cap (no hole)
Figure 3-2: Capillary tubes, single pipe
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