VESDA by Xtralis
VESDA VLF-500 Product Guide
www.xtralis.com
21
3.2
Branched Pipe Network
The table below shows the appropriate hole sizes for pre-engineered designs for a branched pipe set up.
Branched Pipe Network –
(2 branches)
max. length 30 m (90 ft.)
max. distance from detector to branch 5 m (15 ft.)
Sampling
Holes per
Branch
pipe
ID 21 mm Pipe
IPS ¾ in. Pipe
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.)
3
3.5 – 5.5
0 – 2.0
0 – 12
4
3.0 – 5.0
0 – 3.0
0 – 12
5
3.0 – 4.0
0 – 3.0
0 – 12
6
3.0 – 4.0
0.2 – 3.0
0 – 12
7-12*
Use ASPIRE to calculate hole sizes in this range*
Table 3-2: Branched 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 branched pipe arrangement with 5 sampling holes per branch and fitted end caps
without sampling holes.
Legend
A
Smoke Detector
B
Sampling Hole
C
End cap (no hole)
Figure 3-3: Open hole, branched pipe
The set up below shows a branched pipe arrangement with 3 capillary drop pipes per branch and fitted end
caps without sampling holes.
Legend
A
Smoke Detector
B
Capillary Tube
C
End cap (no hole)
Figure 3-4: Capillary pipes, branched pipe
