Purging Methods

Question 1

Direct Displacement method (Air to Gas or Gas to Air) is used for what?

Answer 1

Purging customer services with pipe diameters of 4” or less

Question 2

Complete Fill with Inert Gas method (Nitrogen) is used for what?

Answer 2

Purging only pipelines with a diameter of 4” or greater

Question 3

Slug of Inert Gas method (Nitrogen) is used for what?

Answer 3

Used to separate air from natural gas in a pipeline, best suited for pipelines 500’ and larger than 4” in diameter

Purging must begin within the first 3 minutes, if not a new slug must be made