M200-102-01
11
I56-6576-001
APPENDIX B - PRACTICAL PIPE DESIGNS
for
ASPIRATING SYSTEMS
The following tables show some typical EN54
compliant pipe designs for FAAST LT-200
devices with different overall pipe lengths.
Each design has a one size sample hole for
ease of installing and testing the system.
No exhaust pipe has been included in these
designs.
In all the suggested layouts, the sample hole
spacing is set to 10m between holes, which
is the recommended arrangement for point
smoke detectors in the UK (BS 5839). Air
flow through the detector has been kept at, or
above, 39 l/min for best performance.
In the designs with non-sensing end holes,
the distance to the first hole is 9m and the
end hole is 1m from the last sample hole
.
CLASS
C
PIPE
DESIGNS
WITH
SINGLE
SAMPLE
HOLE/END
HOLE
SIZE
AND
10m
SPACING
1
PIPE
Pipe
Length
Number
of
holes
Hole
size
End
hole*
Air
flow
Flow
balance
Average
sensitivity
Alarm
level
Fan
Total
hole
area
(m)
(mm) (mm) (I/min)
(%/m)
(mm
2
)
100
10
3
3
40
0.5
0.74
1
10
77.76
90
9
3
3
39
0.53
0.66
1
10
70.70
80
8
3.5
3.5
43
0.52
0.91
2
10
86.60
70
7
3.5
3.5
42
0.62
0.79
2
10
76.98
60
6
4
4
45
0.6
1.14
3
10
87.98
50
5
4.5
4.5
45
0.62
0.98
3
9
95.44
40
4
4.5
4.5
45
0.76
0.80
3
10
79.53
30
3
5
5
46
0.83
1.29
4
10
78.55
20
2
5.5
5.5
45
0.92
0.97
4
10
71.28
10
1
6.5
6.5
45
1
1.31
5
10
66.37
* Non‐sensing end hole
CLASS
C
PIPE
DESIGNS
WITH
SINGLE
SAMPLE
HOLE/END
HOLE
SIZE
AND
10m
SPACING
2
PIPE
(T
FORM)
Per
pipe
length
Number
of
holes
Hole
size
End
hole*
Air
flow
Flow
balance
Average
sensitivity
Alarm
level
Fan
Total
hole
area
(m)
(mm) (mm) (I/min)
(%/m)
(mm
2
)
80
8
2.5
2.5
47
0.71
1.16
1
8
83.46
70
7
2.5
2.5
45
0.77
1.03
1
8
73.64
60
6
3
3
46
0.72
0.91
1
5
91.90
50
5
3
3
45
0.81
1.16
2
6
77.76
40
4
3.5
3.5
45
0.81
0.97
2
4
86.60
30
3
3.5
3.5
44
0.91
1.30
3
6
67.36
20
2
4
4
44
0.95
0.98
3
6
62.84
10
1
5
5
45
1
1.31
4
5
58.91
* Non‐sensing end hole
CLASS C PIPE DESIGNS WITH SINGLE SAMPLE HOLE SIZE (Inc. SAMPLING END HOLE)
AND 10m SPACING ‐ 1 PIPE
Pipe
Length
Number
of holes
Hole
size
Air
flow
Flow
balance
Average
sensitivity
Alarm
level
Fan
Total
hole area
(m)
(mm) (I/min)
(%/m)
(mm
2
)
100
X
‐
‐
‐
‐
‐
‐
‐
90
X
‐
‐
‐
‐
‐
‐
‐
80
8
3.5
42
0.6
0.79
2
10
76.98
70
7
4
44
0.58
0.70
2
10
87.98
60
6
4.5
44
0.59
1.00
3
9
95.44
50
5
5.5
45
0.54
0.86
3
8
118.81
40
4
6
44
0.65
0.67
3
8
113.11
30
3
6.5
45
0.78
0.99
4
8
99.56
20
2
6.5
44
0.92
1.31
5
10
66.37
10
X
‐
‐
‐
‐
‐
‐
‐
X: No adequate or recommended single sample hole size design
