Replacing Sensors on Your HVAC System

What You Should Know About Gas Pipework Installation and Testing

27 March 2017 by Olivia Morris

Gas pipework may not work effectively if proper installation and testing is not done. Even if you are planning on hiring an expert to install your home gas pipes, there are some aspects of pipework installation and testing you should know.

Compression Fittings

Copper tubes are used for gas pipework, and sometimes they may need to be jointed using compression fittings. It is important to note that compression fittings can only be placed in areas where they are easily accessible to allow regular inspection, as well as tightening. Therefore, compression fittings cannot be used under floor, underground or in ducts.

Capillary Fittings

Besides compression fittings, capillary fittings can also be used for jointing. Visual checkup is essential to ensure that the solder has run through every joint. When making the joint, your technician should ensure that the flux is only corrosive during heating and remove any excess flux. Flux should not be applied into the opening of the fitting. In addition, twisting the tube while fitting will spread out the flux and further expose the excess flux, which should be wiped off.

Pressure Drop

To minimise pressure drop, an adhesive tape should be used to cover the ends during installation to stop water and dirt from entering the pipes. Also, get rid of any burrs as a result of tube cutting. After the installation of the pipework, the pressure drop can be checked using a manometer. If the pressure is less than the meter outlet working pressure, it means that the diameter may be smaller relative to its length. Another reason for the pressure drop can be partial blockage by debris. Irrespective of the cause of the pressure drop, the problem usually comes from within the installation. Your technician will examine the installation to identify the possible cause.

If there is no pressure drop and the burner pressure is not attained, the appliance governor is probably the problem or any another section within the appliance.

Testing for Gas Tightness

A competent expert is required to test for gas tightness after installation but before connection of the metre to track any faults. If the gas tightness is acceptable, the installation can start service according to the manufacturer's safety guidelines.

After the installation process, it is always advisable to monitor your pipework for any faults that may come up. Regular inspection by a qualified and licensed professional is important to prevent imminent problems. 

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