Publicidad
Idiomas disponibles
Idiomas disponibles
EXAMPLE OF CALCULATION 1
System with 1 Pressure switch calibrated to P
P
: 200 mbar
i
P
: 100 mbar
set
V
: 2 EVP... DN 50 with 20 cm of pipe
p
P
: 1013 mbar
atm
t
: 20"
test
Maximum burner flow rate Q
Limit leakage rate (0.1% of Q
Test volume:
V
= ½ EVP... + ½ EVP... + pipe
p
= (0.95/2) + (0.95/2) + (0.2x2.85)
= 0.475 + 0.475 + 0.57
= 1.52 dm
3
Leakage rate:
(200 – 100) x 1.52 x 3600
V
=
1.2
1013 x 20
The device can detect a leak of 27.00 dm
EXAMPLE OF CALCULATION 2
P
: 250 mbar
i
P
: 125 mbar
set
V
: 2 EVP... DN 100 with 10 cm of pipe
p
P
: 1013 mbar
atm
t
: 20"
test
Maximum burner flow rate Q
Limit leakage rate (0.1% of Q
Test volume:
V
= ½ EVP... + ½ EVP... + pipe
p
= (6.494/2) + (6.494/2) + (0.3x9)
= 3.247 + 3.247 + 2.7
= 9.194 dm
3
Leakage rate V1,2 :
(250 – 125) x 9.194 x 3600
V1,2 =
1013 x 20
The device can detect a leak lower than the maximum value allowed of 500 dm
Two pressure switches must be installed to detect a lower leak.
P
: 50 mbar
set1
P
: 200 mbar
set2
Leakage rate V2 :
(250 – 200) x 9.194 x 3600
V2 =
1013 x 20
Leakage rate V1 :
(50) x 9.194 x 3600
V1 =
1013 x 20
The device can detect a leak of 88.08 dm
minimum value of 50 dm
/h.
3
MTC10
/2
i
: 60 m
/h
3
max
): 60 dm
/h
3
max
= 27.00 dm
/h
3
/h, lower than the maximum value allowed of 60 dm
3
: 500 m
/h
3
max
): 500 dm
/h
3
max
= 204.21 dm
/h
3
= 88.08 dm
/h
3
= 88.08 dm
/h
3
/h, lower than the maximum value allowed of 500 dm
3
/h.
3
28
Madas Technical Manual - 9|9.4 - REV. 0 of 8
/h.
3
/h and close to the standard
3
Feb 2019
th
Publicidad
