Natural Gas Systems & Pipelines Flashcards
7 cards from real BGE practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Natural Gas Systems & Pipelines flashcards as text
Per 49 CFR Part 192, how frequently must gas distribution mains located in business districts be surveyed for leaks using leak detection equipment?
Answer: At least once per calendar year
Federal regulations require that gas distribution mains in business districts be surveyed for leaks at least once per calendar year using leak detection equipment.
What is the purpose of the relief valve on a natural gas service pressure regulator?
Answer: To vent excess gas if downstream pressure exceeds a safe limit
The relief valve automatically vents gas to atmosphere if downstream pressure rises above the setpoint, protecting customers' appliances and piping from overpressure.
What is 'pipeline pigging' in the context of natural gas transmission and distribution operations?
Answer: Sending a device through a pipeline to clean, inspect, or separate products
Pigging involves propelling a device (pig) through the pipeline using gas pressure to remove debris, inspect the pipe wall, or displace liquids from the line.
What does DIMP stand for in the context of natural gas pipeline safety management?
Answer: Distribution Integrity Management Program
DIMP (Distribution Integrity Management Program) is the federally required program under 49 CFR Part 192 Subpart P that operators use to identify and mitigate risks to gas distribution systems.
What is the minimum required burial depth for natural gas distribution service lines installed in residential areas under normal conditions per industry standards?
Answer: 24 inches
Industry standards and 49 CFR Part 192 require a minimum cover of 24 inches for gas service lines in normal soil conditions to protect against surface damage.
What type of joining method is required when connecting polyethylene (PE) gas pipe in the field for a permanent, pressure-rated joint?
Answer: Electrofusion or butt fusion
Electrofusion and butt fusion are the only methods approved for permanent pressure-rated PE gas pipe joints because they create a homogeneous plastic bond as strong as the pipe itself.
What is the primary purpose of a curb valve (service valve) installed on a natural gas service line near the property line?
Answer: To allow utility workers to shut off gas at the curb without entering private property
The curb valve gives utility workers a shutoff point at the property boundary, enabling gas to be turned off for safety or maintenance without needing interior access.