Technical details

LD

S

8.320

Leak monitoring system

s

Positive pressure leak detector type DLR-P 2.0

System description

The positive pressure leak detector type DLR-P 2.0 is suitable for monitoring dou

-

ble-walled piping through which water-hazardous fluids with a

flashpoint below and

above 55 °C are transported.

Principle of functioning

The necessary positive pressure in the surveillance space of the double-walled pip-

ing depends on the actual operating pressure in the medium pipe (inner pipe) and is

generated by topping up regulated by pressure changes from a pump unit integrate

d

into the leak detector. A dry filter is connected ahead of the pump, which dries th

e

ambient air drawn in down to 10 % relative humidity. The surveillance space is con-

nected with the leak detector DLR-P 2.0 via the connection pipes

.

The pressure generated is measured and regulated by means of a pressure-operate

d

switch. After putting the system into operation topping up is regulated by pressure

changes. The integrated pump switches in to do this as soon as the pressure in th

e

surveillance space drops somewhat, e.g. due to thermal influences. If the pressur

e

drops to the ALARM ON level, the optical and acoustic alarm signal is triggered

.

Technical basis

The alarm is triggered at the latest when a pressure which is at least 1.0 bar over th

e

maximum transport pressure of the medium pipe (inner pipe) is reached. The type

s

of laying are illustrated in Worksheets LDS 8.304 and LDS 8.305.

Tips for installation

The leak detector may not be installed in explosion-proof areas. Wherever possible,

the leak detector should be installed inside an enclosed dry and frost-free room with

no access for unauthorized personnel. Please use a weatherproof metal housing fo

r

installation outside of buildings

.

Installation/commencement of operations/operation/function testin

g

A detailed description can be seen from the approval documentation of th

e

DLR-P 2.0 leak detector and the Worksheets for the double-walled piping

.

Normal operatio

n

The normal operational condition is reached when the system is put into operation

after the pressure has built up to the previously set level. The pressure in the surveil

-

lance space is monitored in the leak detector via a pressure­

-operated switch. Any

leaks which may occur lead to a pressure drop.

Alarm trigger level: ON > 2.0 ba

r

DLR-P 2.0

Positive pressure leak monitorin

g

for horizontal laying and single an

d

multiple-line systems

31.03.2026 Subject to technical changes. Page 23