Preparing and Cleaning Pipework
Preparing and Cleaning Pipework
This section provides a guide to current best practice in preparing the distribution
pipework that will be connected to the Compac Dispenser.
For new stations, flush the gas feed lines thoroughly to remove all welding slag,
moisture, and impurities that may be present in the system.
Any steel, brass, or other impurities can damage the regulator and solenoid valve
seals.
The pipework installer is responsible for installing all pipework to
the dispenser with due diligence. Compac is not responsible for any pipework
external to the dispenser.
Ensure that all pipework is completely clean. Any dirt trapped in the
pipework can damage the valve seals and surfaces.
Clean and Degrease the
Pipework
To clean and degrease the pipework:
To prepare pipework, purge the pipework with nitrogen at 200 bar vented to the
atmosphere to remove dirt, moisture, and water.
1. Mix together a 10% hydrochloric acid solution, to which you have added 25%
to 50% ammonia bi-fluoride and heat to a minimum of 65°C.
Wear adequate safety gear and take adequate precautions when
using chemicals. Clean up all spills in compliance with the local territory authority
laws and regulations.
2. Circulate the mixture through the pipework for four hours or more, depending
on the condition of the pipework.
3. Drain the acid solution from the pipework.
4. Blow out the pipework with compressed air.
5. Flush the pipework with clean water until the pH value is neutral.
To neutralise the pipework:
1. Pass a 25% citric acid solution through the pipework once, or dry out the
pipework by blowing hot air through it.
Wear adequate safety gear and take adequate precautions when
using chemicals. Clean up all spills in compliance with the local territory authority
laws and regulations.
2. Fill the pipework with seal oil, then drain.
3. Blow out the pipework with compressed air.
4. Blast the pipes with nitrogen at 200 bar, letting the gas expand through the
pipes.
5. Once the pipework is cleaned, seal off the system to ensure no water, dirt or
other contaminates can re-enter the pipework.
Keep the pipework venting open to the atmosphere and feed in the
200 bar of nitrogen to achieve maximum velocity.
Take care to keep pipe openings closed until the compressor is
started. This prevents rusting of the pipework, and stops dirt from entering.
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