Technical details
LD
S
8.120
Leak monitoring system
s
Maximum monitoring lengt
h
Double-walled piping with vacuum leak monitoring
Basis
ZG-LAGR principles of approval for leak monitoring equipment
for double-walled pipin
g
Example
Type of laying
single line
Alarm-triggering pressure loss “on”
410 mbar
Half alarm-triggering pressure loss
205 mba
r
Type of pipe
FSR 60/8
3
max. monitorable pipe length L max.
~ 460 m
Determining the maximum monitorable pipe lengt
h
Half the alarm-triggering pressure loss “on” in [mbar] of th
e
leak detector used, with certi
ficate of suitability for approval b
y
the building authorities from the DIBt (Deutschen Institut fo
r
Bautechnik), divided by the pressure loss per metre in the sur-
veillance space gives the maximal monitorable pipe length
.
alarm-triggering pressure loss “on” [mbar]
L max.
=
2 · pressure loss [mbar/m
]
Monitorable pipe length for SECON®-X L max. = 500 m
.
Exception: SEC 25 with VLX 330 A/Ex = 335 m resp. VLR 410 / E = 415
m
Sum of all ind. lengths L max. ≤ 2000 m
Diagram for horizontal laying of double-walled pipin
g
FLEXWELL® Safety Pipe (FSR
)
F
S
R
3
0
/
4
8
F
S
R
3
9
/
6
0
F
S
R
4
8
/
7
1
F
S
R
6
0
/
8
3
pressure loss / m
F
S
R
7
5
/
1
0
7
a
l
a
r
m
-
t
r
i
g
g
e
r
i
n
g
p
r
e
s
s
u
r
e
[
m
b
a
r
]
1000
800
70
0
570
50
0
41
0
330
FSR 13/25
FSR 98/134
FSR 127/17
5
200
10
0
90
8
0
70
60
50
50
500
70
200
300
100
1000
2000
~ 46
0
monitorable pipe length [m
]
31.03.2026 Subject to technical changes. Page 5
