LaserFOCUS VLF-500 Product Guide VESDA
®
18
The set up below shows a single pipe arrangement with 6 capillary drop pipes and a fitted end
cap without a sampling hole.
Figure 18 - Capillary tubes, single pipe
Branched pipe network
The table below shows the appropriate hole sizes for pre-engineered designs for a branched
pipe set up.
Table 4 - Branched pipe hole numbers and sizes
*For code-specific information, see Codes and Standards Information for Air Sampling Smoke
Detection on page iv.
Branched Pipe Network –
(2 branches)
max. length 30 m (90ft.)
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
in. Capillary*
with
1
/
8
in. hole
Hole Size (mm) Length (m) Hole Size (in.) Length (ft.)
3 3.5 – 5.5 0 – 2.0
5
/
32
–
7
/
32
0 – 12
4 3.0 – 5.0 0 – 3.0
1
/
8
–
3
/
16
0 – 12
5 3.0 – 4.0 0 – 3.0
1
/
8
–
5
/
32
0 – 12
6* 3.0 – 4.0 0.2 – 3.0
1
/
8
–
5
/
32
0 – 12
7-12* Use ASPIRE2 to calculate hole sizes in this range*
C
B
A
Legend
A Smoke detector B Capillary tube C End cap (no hole)