Operators
manual
Gorter-Controls B.V. – Schoonhoven- The Netherlands
Operators manual underground gas pressure reducing station
Type: COCON 26 N-LP
Page 12
4.3 Checking: correct operation
The cartridge must be readjusted if it is not operating as required. The cartridge's operation
requirements, are described in paragraph 2.4 on page 9. Adjustment data can be found in paragraph
4.8 on pages 24 and 25.
Failures can be caused by:
Problem 1
:
The outlet pressure is too high.
Cause a
:
The regulator pilot ARP-LP has not been correctly adjusted.
Solution a
:
Readjust the pilot. See paragraph 4.8 on page 18.
Cause b
:
The regulator has opened. The function of the regulator has been
taken over by the monitor control.
Solution b
:
Replace the cartridge with a spare cartridge. Overhaul the defective
cartridge.
Problem 2
:
The outlet pressure is much too high.
Cause
:
The regulator, monitor control, shut off valve and shut off relay are defect.
Solution
:
Replace the cartridge with a spare unit. Overhaul the defective
cartridge.
Problem 3
:
The outlet pressure is too low.
Cause a
:
The regulator pilot ARP-LP has not been correctly adjusted.
Solution a
:
Readjust the pilot. See paragraph 4.8 on page 18.
Cause b
:
The differential pressure
Δ
p is too small.
Solution b
:
Increase the inlet pressure.
Cause c
:
The filterelement is faulty.
Solution c
:
Replace the filterelement with a new one. See paragraph 4.9.3 on page 21.
Problem 4
:
Gas is required, but is not passing through.
Cause a
:
The ball valve is closed.
Solution a
:
Open the ball valve.
Cause b
:
The butterfly valve is closed.
Solution b
:
Open the butterfly valve.
Cause c
The valve in the supply pipeline, located within a distance of 5 meters
from the station's inlet is closed.
Solution c
:
Open the valve in the supply pipeline.
Cause d
:
The valve in the discharge pipeline, located within a distance of 5 meters
of the station's outlet is closed.
Solution d
:
Open the valve in the discharge pipeline.
Cause e
:
The regulator pilot ARP-LP and/or the monitor control pilot MRP-LP
are
not
adjusted
correctly.
Solution e
:
Readjust one or both pilots. See paragraph 4.8 on page 18.
Cause f
:
The safety shut-off valve is closed.
Solution f
:
Replace the cartridge with a spare cartridge. Overhaul the defect
cartridge.
