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
