Mechanical Installation - Compac CNG Installation And Service Manual

Mechanical Installation

Overview
Special Precautions
Pipework
Compac Industries Ltd.
The stages of mechanical installation include:
 Preparing and cleaning the pipework (see page 11).
 Mounting the loading post.
 Connecting the pipework (see page 13).
Ensure the system design does not allow the loading post
inlet pressure to exceed its rating. The loading post does not include any
safety mechanisms to protect against excessive inlet pressure. If
necessary, suitable protective devices should be fitted prior to the loading
post inlet.
Take all possible steps to prevent water or dirt from entering
the system, both during installation and in the future. Water and dirt blocks
up the pipework, which can damage seals, and stop gas from flowing and
valves from operating.
At 200 bar of pressure, water freezes at 15°C in natural gas,
causing ice particle contamination.
Seals that have been damaged by moisture, methanol,
impurities, dirt slag etc, are not covered by warranty.
During installation, potential sources of water include:
 Inlet gas.
Testing new inlet gas pipework with water, or allowing water to enter

the pipework before making the final connections.
 Pumping the storage with air.
 Allowing water to enter the high-pressure gas lines during installation.
If the inlet gas is likely to be saturated, install a gas drier into the
compressor inlet to ensure a dew point of –32°C at 250 bar of pressure.
Do not use methanol as an anti-freeze. If used in the wrong
concentrations, it causes freezing. It is also absorbs water, which can be
more damaging than the water that was originally present.
Check the high points and low points of the
pipework distribution system to make sure
that:
 Vents have been provided on all high
points.
 Drains have been provided on all low
points.
Page 10
Mechanical Installation
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