Instruction Manual Dräger P7-TDX
35
14.1 Static pressure
Measuring the static pressure enables detecting errors in the pressure reducer (regulator)
and in the shut-off valve (ball valve) upstream of the consumer.
The valve upstream of the regulator must be open, the valve upstream of the consumer
must be closed.
A constant pressure in the gas pipeline is expected, the amount of which provides infor-
mation, on whether the pressure reducer is correctly adjusted for the pressure required
(e.g. 23 hPa (mbar)).
Observing the chronological sequence of the pressure measured provides information on
whether regulator and ball valve are OK.
Measurement result
Test result
Pressure increases
regulator untight
Pressure drops and then increases again
ball valve downstream of regulator untight
Pressure remains constant
ball valve and regulator OK
14.2 Flow pressure
Measuring the flow pressure enables detecting errors in the pressure reducer (regulator).
The valve upstream of the regulator must be open. The valve upstream of the consumer
must be open and the consumer must be operating.
A fairly constant pressure in the gas pipeline is expected, the amount of which approxi-
mately complies with the static pressure. If the flow pressure is significantly lower, the
pressure drop on the pressure reducer is too high.
Observing the chronological sequence of the pressure measured provides information on
whether the regulator is working properly.
Measurement result
Test result
Pressure fluctuates strongly
regulator defective (sticky membrane)
Pressure remains nearly constant
regulator OK
14.3 SAV pressure
The measurement provides information on whether the SAV (safety shut-off valve) pres-
sure is adjusted correctly. The valve upstream of the SAV must be open, the valve up-
stream of the consumer closed.
The pressure downstream of the regulator (secondary side) in the gas pipeline must be
increased.
If the SAV pressure is exceeded, the SAV is triggered and the gas supply on the primary
side is blocked (loud clicking). The existing pressure (secondary side) at the time of the
clicking is the SAV pressure.
The SAV block must then be disengaged again manually.
