Technical details
LD
S
8.130
Leak monitoring system
s
Maximum monitoring lengt
h
Double-walled piping with positive pressure leak monitorin
g
Basis
ZG-LAGR principles of approval for leak monitoring equipmen
t
for double-walled piping
Determining the maximum monitorable pipe lengt
h
Half the alarm-triggering pressure loss “on” in [mbar] of the
leak detector used, with certificate of suitability for approval b
y
the building authorities from the DIBt (Deutschen Institut for
Bautechnik), divided by the pressure loss per metre in the sur-
veillance space gives the maximal monitorable pipe length
.
differential pressure in surveillance space [mbar]
L max. =
2 · pressure loss [mbar/m
]
Monitorable pipe length for SECON®-X L max. = 500 m.
Exception: SEC 25 with DLR-P 2.0 = 405 m
Sum of all ind. lengths L max. ≤ 2000 m
Example
Type of laying
single line
Transport pressure in operating pipe
5 bar
Monitoring pressure in surveillance space
7 bar
Alarm-triggering pressure rise „on“
6 bar
Differential pressure in the surveillance space
1 bar
Alarm-triggering pressure rise „on“ 6 bar gives 1000 mba
r
differentia
l
pressure/
400 mbar wit
h
DLR-P 2.0
Half alarm-triggering pressure rise
500 mba
r
Type of pipe
FSR 60/8
3
max. monitorable pipe length L max.
1100 m
/
450 m with
DLR-P 2.0
Diagram for horizontal laying of double-walled pipin
g
FLEXWELL® Safety Pipe (FSR
)
d
i
f
f
e
r
e
n
t
i
a
l
p
r
e
s
s
u
r
e
i
n
s
u
r
v
e
i
l
l
a
n
c
e
s
p
a
c
e
[
m
b
a
r
]
2000
DLR-G
1000
800
700
600
50
0
DLR-
P
400
300
F
S
R
3
0
/
4
8
F
S
R
3
9
/
6
0
F
S
R
4
8
/
7
1
pressure loss / m
FSR 60/8
3
FSR 75/107
FSR 13/2
5
FSR 98/134
FSR 127/175
200
100
90
8
0
70
6
0
5
0
50
500
7
0
100
1000
2000
200
30
0
ca. 45
0
ca. 110
0
monitorable pipe length [m
]
31.03.2026 Subject to technical changes. Page 6
