VESDA Pipe Network Design Guide
VESDA by Xtralis
32
www.xtralis.com
6.2
Detector Parameters
Different detectors in the VESDA range have different characteristics. The pipe network design parameters
for each of these detectors may vary according to site conditions and requirements. The parameters for
VESDA detectors are given below.
Parameters
VLF-250
VLF-500
VESDA VLC VESDA VLP VESDA VLS
VESDA VLI
ASPIRE2 support
Yes
Yes
Yes
Yes
Yes
Yes
Maximum area covered
250 m²
(2,500 sq.ft)
500 m²
(5,000 sq.ft)
800 m²
(8,000 sq.ft)
2,000 m²
(21,500 sq.ft)
2,000 m²
(21,500 sq.ft)
2,000 m²
(21,500 sq.ft)
Maximum number of Pipes
1
(2 branches)
1
(2 branches)
1
(2 branches)
4
(8 branches)
4
(8 branches)
4
(8 branches)
Maximum aggregate length
25 m
(80 ft)
50m
(150ft)
80 m
(260 ft)
200 m
(650 ft)
200 m
(650 ft)
360 m
(1,200 ft)
Maximum length for each pipe
N/A
N/A
N/A
100 m
(325 ft)
100 m
(325 ft)
90 m
(300 ft)
Maximum branch length
15 m (50 ft)
30m (90ft)
50 m (164 ft)
N/A
N/A
N/A
Maximum sampling holes per pipe
(including end cap hole)
12
24
20
25
25
16
Maximum sampling holes per branch
(including end cap hole)
6
12
20
Aggregate
max 25
Aggregate
max 25
Aggregate
max 16
Maximum length of capillaries
4 m (13 ft) for
small bore
(5.2 mm)
tube and 8 m
(26 ft) drop
pipes.
4 m (13 ft) for
small bore
(5.2 mm)
tube and 8 m
(26 ft) drop
pipes.
4 m (13 ft) for
small bore
(5.2 mm)
tube and 8 m
(26 ft) drop
pipes.
4 m (13 ft) for
small bore
(5.2 mm)
tube and 8 m
(26 ft) drop
pipes.
4 m (13 ft) for
small bore
(5.2 mm)
tube and 8 m
(26 ft) drop
pipes.
4 m (13 ft) for
small bore
(5.2 mm) tube
and 8 m (26
ft) drop pipes.
Aspirator speed:
Fixed
Fixed
Fixed
Variable
Variable
Variable
Minimum system air flow
12
liters/minute
12
liters/minute
20
liters/minute
20
liters/minute
20
liters/minute
40
liters/minute
Minimum air flow per pipe
N/A
N/A
N/A
15
liters/minute
15
liters/minute
20
liters/minute
Minimum sector pressure
65 Pa
65 Pa
70 Pa
70 Pa
70 Pa
70 Pa
Table 6-1: VESDA detector parameters
The parameters given above are for a typical pipe network. Site conditions and requirements will dictate the
final parameters for each site. The aggregate pipe length can exceed the published values, provided the
minimum pressure at each sampling point is at least 25 pascals. It is recommended that transport time for the
network is maintained at 60 seconds or less and hole balance and hole share be at least 70% (use ASPIRE2
to calculate these values). These values may be relaxed subject to local fire codes and conditions. Exceeding
the guidelines listed in this manual is allowable if the ASPIRE2 software approves the design.
These pipe lengths represent best practice for systems with single pipe runs on each port (no branching).
Longer and/or more complex pipe arrangements are also possible and must be verified using ASPIRE2 to
ensure transport time and system balance requirements are met.
Содержание VESDA VLC-505
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