System Sensor FAAST FL0111E-HS - Page 11

D200-101-01
11
I56-6574-000
APPENDIX B - PRACTICAL PIPE DESIGNS for ASPIRATING SYSTEMS
The following tables show some typical EN54
compliant pipe designs for FAAST LT-200
devices with di󰀨erent 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
ow 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 rst 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