Operators
manual
Gorter-Controls B.V. – Schoonhoven- The Netherlands
Operators manual underground gas pressure reducing station
Type: COCON 26 N-LP
Page 15
4.5.3 Placement of the casing
Remark:
Use a lifting tackle, a hoist and two slings to install the casing.
During bad weather conditions (storm and wind), place a shelter above the station.
This will prevent water and dirt from getting into the station. It is important that the
area under the shelter is well ventilated.
Support the opened pit cover, by windforce eight and up, with a support.
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Close casing cover and pit cover
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Put the slings around the plate to which the pit cover frame is attached.
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Hoist the casing carefully. Ensure that the centre of the casing hangs above the centre of the
pit.
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Lower the casing carefully onto the foundation.
The supply and discharge pipes are attached to the casing with a connecting flange.
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Put a seal ring DN50 between the supply pipe flange and the ball valve flange.
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Attach the supply pipe flange to the ball valve flange with four bolts M16, four nuts M16 and
eight washers. The washers are situated between the bolt heads and the supply pipe flange
and between the ball valve flange and the nuts.
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Do not put a seal ring DN150 between the discharge pipe flange and the butterfly valve.
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Attach the discharge pipe flange to the butterfly valve with eight bolts M20, eight nuts M20 and
sixteen washers. The washers are situated between the bolt heads and the discharge pipe
flange and between the butterfly valve and the nuts.
Remark:
Insulate the flange connections with a covering, to prevent the fastenings from
corroding.
We advise you to place a railing around the station. This prevents the station from obstruction e.g.
vehicles. Use galvanized piping.
4.5.4 Installation of vent pipes
Remark:
During bad weather conditions (storm and wind), place a shelter above the station.
This will prevent water and dirt from getting into the station. It is important that the
area under the shelter is well ventilated.
Support the opened pit cover, by windforce eight and up, with a support.
The pressure in all of the stations compartments must be equal to the atmospheric pressure, before
you remove the cartridge. This means that you must deventilate all compartments. The needle valves,
with which you deventilate the compartments, are situated directly under the pit cover. Open the
needle valves before removing the cartridge from the casing, so that compressed gas will expand to
atmospheric pressure.
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Fill the space between the station and wall of the hole, until just under the vent connection on
the casing with soil. Press the soil firmly.
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Place the vent pole at a distance of approximately 0,5 metres from the casing.
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Attach two ½" hoses with fittings between the Cocon body and the vent pole.
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Close the pit cover.
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Fill the space between the station and wall of the hole to ground level with soil. Press the soil
firmly.
