Purge Out of Service

Question 1

Purging must be done until either of the following is achieved ______

Answer 1

The O2 concentration is at least 20.8%

The gas concentration is less than 3.5%

Question 2

Purging discharge at a vent stack must be what?

Answer 2

Controlled with a shutoff valve

Continuously attended at the open point

Monitored with CGI

Question 3

Purging a service too fast may cause what to close

Answer 3

Excess Flow Valve (EFV)

Question 4

When a customer service or a main pipeline is being purged into service a reading of at least ________ is measured using a CGI

Answer 4

95%