Why purging are needed in newly built gas pipes?

Asked by: Marco Louis

When a newly constructed natural gas pipeline is put into service, the initial air in the line must be purged. If natural gas is used directly to perform the purging, the air and the natural gas will mix, and flammable mixtures will form in the pipeline. The safety hazard such mixtures present is of concern.1 нояб. 1988

Why do we purge gas lines?

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 is pipeline purging?

IPC. Search. Gas purging, a process of displacing one gas by another gas, occurs on a routine basis in the natural gas industry when pipelines are purged into and out of service. In a project sponsored by the Gas Research Institute and in cooperation with the American Gas Association (A.G.A.)

What is the importance of purging or bleeding the gases in the hose lines?

Bleeding or purging is carried out to avoid the possibility of an explosive air/gas mixture existing or forming in your gas appliances.

When should purging be done?

Generally speaking, dermatologists say purging should be over within four to six weeks of starting a new skin care regimen.

Where should gas piping be purged?

the outside atmosphere

Any purging of natural gas, or purging of air or other contents with natural gas, should only be done in a well-ventilated area or by safely venting the contents into the outside atmosphere where there are no people, animals, structures or sources of ignition present.

What do you purge a gas line with?

Line so what you would do is hook the whole line up you would take this thing off the heat injector. And then you want to make sure that you turn this into the shut-off. Position.

How is purging done?

Purging relies on the principle that a combustible (or flammable) gas is able to undergo combustion (explode) only if mixed with air in the right proportions. The flammability limits of the gas define those proportions, i.e. the ignitable range.

What is purging in boiler?

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.

What is purging in gas turbine?

Gas turbines that burn liquid fuel systems require a liquid fuel purge system to clear the fuel nozzles in the combustors of liquid fuel. Similarly, a water purge system is required to purge the water injection system that is often used to add water to the combustion chamber when a gas turbine runs on liquid fuel.

Why is purging a boiler important?

If you are having trouble getting sufficient hot water, then your hot water boiler may need purging. Purging a boiler is a simple way of saying that you are going to get the air out of it so the water can run freely. Air bubbles stop water flow and need to be purged, or the boiler will not function.

What is purging in construction?

In short, when you purge a weld, you remove any gases from the welding joint that may impact the weld during or right after the process and lead to oxidation, discoloration, or corrosion. ¹.

What does it mean to purge a system?

What Does Purging Mean? Purging is the act of removing the contents of a pipe or container and replacing it with another gas or liquid. Purging is crucial in pipeline, piping, welding and industrial process. It removes contaminants from the piping and vessels, which reduces chances of corrosion.

What is purging material?

A purging compound is a resin-based product designed to clean thermoplastic molding machines of many types; injection molding machines, blow molding machines, and extruders which are used to manufacture plastic parts for a wide range of industries, including automotive, consumer, medical, and many others.

What is purge pressure?

Purge is the process used to remove any potentially hazardous gas from the interior of the enclosure prior to pressurization. The purge cycle performs “air-exchanges” that displace any explosive (hazardous) gas with inert, protective gas instead.

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.

What is gas purging in confined space?

Purging involves removing contaminants inside the confined space by displacing air to achieve acceptable atmospheric levels. For example, a confined space could contain toxic gas. If you blew air into the space, you would reduce the gas concentration below the appropriate atmospheric exposure level.

What is purge ventilation?

Purge ventilation is manually controlled ventilation of rooms or spaces at a relatively high rate to rapidly dilute pollutants and/or water vapour. Purge ventilation may be provided by natural means (e.g. an openable window) or by mechanical means (e.g. a fan).

What is inert entry?

Entry into a confined space with an inert atmosphere starts as soon as any part of the entrant’s body breaks the plane of an opening into the space and triggers the need for rescue capability. “Entry” includes all subsequent activities in the inert confined space.

Why co2 is not used in inert gas?

NFPA 77 states that carbon dioxide from high-pressure cylinders or fire extinguishers should never be used to inert a container or vessel. The release of carbon dioxide may generate static electricity with enough energy to ignite the mixture, resulting in an explosion.

What is the maximum oxygen concentration for inert entry?

4% Oxygen

In the case of inerted atmospheres, a space which must be entered, the Lower Explosive Limit should be maximum of 10%, and a maximum of 4% Oxygen to prevent fire or explosion.

Is inert gas flammable?

Inert gases are non-combustible, non-flammable, and non-reactive to many materials. Examples include argon, helium, nitrogen, and neon.

Is LPG an inert gas?

LPG | Inert Gases with iFLOW Technology.

What is inerting and purging?

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.

Is CO2 a inert gas?

Historically, the noble gases (helium, neon, argon, krypton, xenon, and radon) were referred to as inert gases. Nitrogen (N2), argon (Ar), and carbon dioxide (CO2) are commonly used inert gases in the wine industry because these have little or no reactivity with wine.

What are the 7 inert gases?

Helium, nitrogen, neon, argon, krypton, xenon, and radon are inert gases.

• Inert gas systems on ships. …
• Inert gas systems on aircraft. …
• Welding. …
• Diving.

Why nitrogen is inert gas?

The triple bond is pretty strong. Therefore, it needs a lot of energy to break those bonds and participate in a reaction. So nitrogen is commonly referred to as and used as an inert gas (high abundance & low cost.) Dissociation energy of its molecule is fairly high.