15
© 05.2022
7.17
7.16
7.19
7.18
7.14
7.15
7.14
7.4 Initial Commissioning / Recommissioning
Initial commissioning of the system components shall be carried out by the operator. For commissioning, please refer to
the documents listed under item 1 “General Information” and the system operator's work instruction.
The devices delivered by MEDENUS Gas-Druckregeltechnik GmbH are factory-set to the operating data specified by the
customer. This data is listed on the type plate and the Acceptance Test Certificate (ATC).
Prior to commissioning of the system, a functional test must be performed on the gas pressure
regulator (GPR), if applicable, and the safety shut-off and safety relief valves.
Procedure (fig. 7.1) inlet shut-off device
•
Close the ball valve upstream of the valves and fittings (item 7.01).
•
Close the downstream shut-off devices (item 7.13) (ball valve, solenoid or pneumatic valve).
•
Depressurize the system (item 7.11).
•
Close the venting ball valve (item 7.11).
•
Slowly open ball valve upstream of the valves and fittings (item 7.01) (pressure increase approx. 0.5 bar/s).
If the inlet shut-off device is equipped with a bypass, the latter must be slowly opened for pressure
compensation as step 1. This is followed by slowly opening the inlet shut-off valve which will close
the bypass.
•
Check the inner leakage of the SSV (item 7.06) by reading the pressure gauge
installed downstream of the GPR (item 7.12).
•
Unscrew the sealing cap (item 7.15) of the safety shut-off valve (SSV).
•
On a GPR with bypass ball valve (item 7.28), carefully open the ball valve (item
7.28) of the bypass line while pulling the pull knob (item 7.14) until the SSV
engages to perform pressure compensation.
•
A closing pressure corresponding to the set value is established on the GPR.
•
Checking the upper response pressure of the SSV:
If an SRV is available in the section, close the ball valve in front of the SRV.
Increase the outlet pressure up to the upper response pressure by using
suitable means. Reduce the outlet pressure via adequate ventilation and
engage the SSV by pulling the pull knob.
Checking the lower response pressure of the SSV:
Via adequate venting, reduce the outlet section up to the lower
response pressure.
During the check, observe the manometer.
•
It may be necessary to correct the setpoint values of the response pressures.
This is done by turning the SSV setpoint setting screws (items 7.17 / 7.19) to
the right (pressure increase) or left (pressure decrease) in order to increase/
decrease the setpoint value.
The inner setting screw (item 7.17) sets the underpressure shut-off
level (lower trigger level) and the outer setting screw (item 7.19) sets
the upper trigger level.
•
Perform pressure compensation again via the SSV by carefully opening the
ball valve of the bypass valve (item 7.28) and pulling the pull knob (item 7.14)
and allow the SSV to engage.
Note
Note
Note
Fig. 7.3
Fig. 7.4
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