GPT GPT Gas Metering & Measurement 2 — Questions and Answers
Question 1: What is the purpose of a pressure regulator at the meter set?
- Increase gas pressure for appliances
- Reduce distribution line pressure to a safe service pressure (Correct answer)
- Measure gas consumption
- Filter moisture from the gas
Correct answer: Reduce distribution line pressure to a safe service pressure
The service regulator reduces high distribution main pressure to the lower, safe working pressure required for customer service connections.
Question 2: Gas meters are typically sized based on:
- The number of rooms in the building
- The total connected load of all appliances (Correct answer)
- The pipe diameter only
- The building's square footage
Correct answer: The total connected load of all appliances
Meter size is determined by calculating the total BTU/hr input of all connected appliances and converting to the required CFH flow capacity.
Question 3: What happens when a gas meter is bypassed without authorization?
- The meter reads higher than actual consumption
- It constitutes illegal gas theft (Correct answer)
- The system pressure increases
- It triggers an automatic shutoff
Correct answer: It constitutes illegal gas theft
Bypassing a gas meter to avoid payment is illegal and constitutes gas theft, which can result in criminal charges and civil liability.
Question 4: A turbine meter is best suited for which application?
- Low-flow residential service
- High-flow commercial or industrial applications (Correct answer)
- Outdoor portable gas systems
- Appliance-level monitoring
Correct answer: High-flow commercial or industrial applications
Turbine meters are designed for high-flow applications such as commercial and industrial facilities consuming large volumes of gas.
Question 5: What is the correct procedure when replacing a gas meter?
- Replace the meter with gas flowing to maintain pressure
- Shut off upstream valve, replace meter, pressure test, then restore gas (Correct answer)
- Replace meter then check for leaks with an open flame
- Notify the customer only after replacement is complete
Correct answer: Shut off upstream valve, replace meter, pressure test, then restore gas
The upstream valve must be closed before removing the old meter, and after installing the new meter a pressure test confirms no leaks before restoring gas service.
Question 6: Meter accuracy is typically verified by the utility using a process called:
- Volumetric calibration
- Meter prover testing (Correct answer)
- Flow bench analysis
- Pressure differential testing
Correct answer: Meter prover testing
Meter prover testing compares the meter's readings against a certified precision reference volume to verify accuracy within acceptable tolerances.
GPT GPT Gas Metering & Measurement 2
What is the purpose of a pressure regulator at the meter set?