What is purging natural gas?

Purging of gas lines When newly constructed natural gas pipelines are put into service, the initial air in the line must be purged. This eliminates the risk of a dangerous air/natural gas combination that can form flammable mixtures within the pipeline.

What are the two types of purging procedure?

The four core methods of nitrogen purging include:

  • Pressure transfer of liquids. In certain cases, you may want to transfer liquids without using a pump.
  • The pressure-hold vacuum method.
  • Displacement purging.
  • Dilution purging.

What is purging in ship?

Inerting and purging refer to replacing the atmosphere in a line, vessel or other area with an inert atmosphere, eg the space above liquid fuel in a fuel tank, to reduce the likelihood of combustion. Purging of supply lines, pipelines and tanks is a common step before commencing production or prior to shutdown.

What is the full meaning of purging?

to rid of whatever is impure or undesirable; cleanse; purify. to rid, clear, or free (usually followed by of or from): to purge a political party of disloyal members.

What is 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 difference between purging and ventilation?

After the contaminants have been removed (“purged”), the confined space may be ventilated. “Ventilation” means the continuous provision of fresh air into the confined space by mechanical means to maintain acceptable atmospheric levels.

Can co2 be used as a purge gas?

Carbon dioxide is a safe inert gas for purging. Carbon dioxide is an unsafe inert gas for inerting, as it may ignite the vapors and result in an explosion.

What is purging and gas freeing?

When the tanker is fitted with an inert gas system, the discharged cargo tanks are purged until the hydrocarbon vapors in the cargo tanks have been reduced to less than 2% by volume. Gas freeing may then take place at the cargo tank deck level.