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What is purging a gas line?

3 min read

Asked by: Sherard Gullatte

Purging is carried out to avoid the possibility of an explosive air/gas mixture existing or forming in consumer piping, appliances or confined spaces. Purging is defined as: the displacement of air, or an inert gas, by a fuel gas; or. the displacement of a fuel gas by air, or an inert gas.

What is gas purging procedure?

Purging is defined as: • the displacement of air, or an inert gas, by a fuel gas; or • the displacement of a fuel gas by air, or an inert gas. Purging to displace air or inert gas with a. combustible gas must take place immediately following a successful gas tightness test.

How long does it take to purge gas line?

Bleeding the Lines



This could take anywhere from one to 10 minutes to bleed air out of the lines as the gas starts to flow. Once the pilot is lit, continue to press the valve knob inward for 30 seconds before releasing it.

What does it mean to purge a pipe?

Purging a pipe prior to a weld is the act of displacing the atmosphere of a pipe or vessel and replacing it with another inert gas or in some cases a liquid. Purging is critical to the success of welding stainless steel, titanium or other corrosion metals.

What is a gas purge and relight?

Re-establishing supply includes the purging air from the system, which would otherwise lead to incomplete combustion when gas appliances are relit. This part of the process is known as ‘purge and relight’.

What is the purpose of purging?

Purging ensures that you have control over which gases are in your gas delivery system, and therefore which gases are being exposed to internal components, sensors, or other equipment. It also helps to prevent unwanted reactions from taking place, which can greatly increase the service life of related components.

Why do we purge gas pipework?

Purging is carried out to avoid the possibility of an explosive air/gas mixture existing or forming in consumer piping, appliances or confined spaces. Purging is defined as: the displacement of air, or an inert gas, by a fuel gas; or. the displacement of a fuel gas by air, or an inert gas.

How do I purge my gas line to my furnace?

Simple Steps to Bleed Your Gas Furnace

  1. Step #1 Ventilate the Area.
  2. Step #2 Open the Valve Assembly.
  3. Step #3 Push the Igniter Switch.
  4. Step #4 Push and Hold the Gas Valve Control Knob.
  5. Step #5 Push the Igniter Switch.
  6. Step #6 Continue Pushing the Igniter Switch.
  7. Step #7 Check How Your Furnace Ignites.


How do you get air out of gas lines?

It is to walk over shut off your wall switch. Turn your wall switch back on and it'll go through another 45 seconds. You should do that up to three times and that will get rid of the air in the gas.

How do you get air out of a house gas line?

How To Bleed Air Out Of A Natural Gas Line? By pressing the igniter button repeatedly until the pilot ignites, you must be sure that you have hit the right button and the valve has been turned on. In order to remove the air, it could take anywhere between 1 and 10 minutes once the gas has begun to circulate.

Why we use nitrogen for purging?

Why Is Nitrogen Used for Purging? Nitrogen is dry and non-combustible, and the nitrogen displacement of combustible gases will prevent an unstable and potentially ignitable atmosphere.

What is direct purging?

direct purging means the displacement of air by natural gas or vice versa; Sample 1. Sample 2.

What does purge mean on gas furnace?

Purging is like opening the window on your furnace to let air in. It is required by the NFPA86 and should be done before each furnace heating system start-up. The purge of airflow removes gaseous combustibles in a furnace and replaces it with air.

Which gas is not used in purging?

The most common purge gases commercially available in large quantities are nitrogen and carbon dioxide. Other inert gases, e.g. argon or helium may be used. Nitrogen and carbon dioxide are unsuitable purge gases in some applications, as these gases may undergo chemical reaction with fine dusts of certain light metals.