Operators
manual
Gorter-Controls B.V. – Schoonhoven- The Netherlands
Operators manual underground gas pressure reducing station
Type: COCON 26 N-LP
Page 20
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Set the monitor control pilot at a value, at which the shut-off relay must close the shut-off valve
(set value monitor control = closing pressure shut-off valve).
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Turn the spindle on the shut-off relay to the left, until the shut-off valve closes. The red button
underneath the transparent cap on the shut-off relay, will then "spring" up.
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Place the protective cap over the shut-off relay's spring casing.
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Decrease the outlet pressure by opening the needle valve.
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Turn the spindle on the monitor control pilot to the left.
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Press the reset button on the shut-off relay in.
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Set, with the monitor control pilot, a value at which the monitor control must start to operate.
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Tighten the locking nut on the monitor control pilot's spindle, without turning the spindle.
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Turn the spindle on the regulator pilot to the left, until the pressure gauge shows the required
reduced pressure.
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Tighten the locking nut on the regulator pilot's spindle, without turning the spindle.
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Close the needle valve.
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Close the valve attached in the supply pipe, located within 5 meters of the station.
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Close the ball valve DN50 in supply pipe, by turning the ball valve's handle a quarter of a turn
to the right.
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Close the butterfly valve DN150 in the discharge pipe, by turning it a quarter of a turn to the
left
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Close the casing cover.
Now you can start operating the cartridge; see paragraph 4.6.4 on page 23.
4.9 Replacing parts
The following paragraphs describe the replacement of a number of parts in the cartridge. The
following parts can be replaced on site, by the operator.
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The two upper seal rings between the cartridge and casing (paragraph 4.9.1);
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The two lower seal rings between the cartridge and casing (paragraph 4.9.2);
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Dust filter (paragraph 4.9.3).
The remaining parts must be replaced by a qualified maintenance engineer in the service workshop.
Paragraph 4.7 describes how to remove the cartridge from its casing.
