RMGA Gas Distribution Systems 3

Question 1

What is the purpose of a gas distribution main valve installed at key intersections in the piping network?

Accepted Answer

To isolate sections of the main for maintenance or emergency response

Answer

To regulate pressure for downstream customers

Answer

To measure flow through the distribution system

Answer

To introduce odorant into the gas stream

Question 2

What class of plastic pipe is most commonly used for natural gas distribution in North America based on pressure rating?

Accepted Answer

PE 4710

Answer

PE 2406

Answer

PE 3408

Answer

All of the above are acceptable

Question 3

What is 'leak survey frequency' determined by under 49 CFR Part 192 for gas distribution systems?

Accepted Answer

Business classification (e.g., business district vs. residential) and pipe material

Answer

Customer complaints only

Answer

Annual regulatory mandate regardless of system type

Answer

Number of active meters in the system

Question 4

What is the function of a gas pressure regulator's 'vent line'?

Accepted Answer

To release excess loading gas from the diaphragm chamber to atmosphere

Answer

To supply gas to the pilot light

Answer

To connect the regulator to the downstream sensing point

Answer

To drain condensate from the regulator body

Question 5

What record must a gas distribution operator maintain for each main and service line?

Accepted Answer

As-built drawings or maps showing pipe location, size, material, and installation date

Answer

Customer credit history

Answer

Monthly gas quality test results

Answer

Annual employee training certificates

Question 6

Which type of fitting allows a branch connection to be made on a polyethylene gas main without interrupting gas service?

Accepted Answer

Service tee saddle (saddle fusion fitting)

Answer

Electrofusion tee

Answer

Mechanical compression coupling

Answer

Flanged tee assembly