Gas Piping Inspection Procedures: A Comprehensive Guide for Students

Question 1

When inspecting gas piping, it's essential to identify potential hazards. Explain the steps you would take to reduce these risks.

Accepted Answer

Wear safety gear, ventilate the area, and use a gas detector to check gas levels.

Answer

Inspect only visible piping, avoid tight spaces, and use a flashlight for lighting.

Answer

Ignore gas leaks, as they will seal themselves over time.

Question 2

Which type of natural gas is primarily used in residential applications in the United States?

Accepted Answer

Methane

Answer

Ethane

Answer

Propane

Answer

Butane

Question 3

What is the minimum allowable working pressure for a natural gas piping system in residential settings?

Accepted Answer

2.5 inches water column (w.c.)

Answer

5.0 inches w.c.

Answer

7.5 inches w.c.

Answer

10.0 inches w.c.

Question 4

Which type of fitting is used to connect two pipes of different sizes in a gas piping system?

Accepted Answer

Reducer

Answer

Tee

Answer

Elbow

Answer

Union

Question 5

What is the primary purpose of a gas leak detector in a gas piping system?

Accepted Answer

To detect the presence of combustible gases

Answer

To measure the flow rate of gas

Answer

To regulate the pressure of gas

Answer

To prevent gas explosions

Question 6

Which of the following is not a tool commonly used for gas piping inspection?

Accepted Answer

Voltmeter

Answer

Manometer

Answer

Gas leak detector

Answer

Pressure gauge

Question 7

In a gas piping system, what is the primary function of a pressure regulator?

Accepted Answer

Maintaining constant gas pressure

Answer

Preventing gas leaks

Answer

Filtering out impurities

Answer

Measuring gas flow rate

Question 8

Which fitting is used to connect pipes of different diameters in a gas piping system?

Accepted Answer

Reducing coupling

Answer

Union

Answer

Tee

Answer

Elbow

Question 9

Which document provides detailed guidelines for gas piping inspection procedures?

Accepted Answer

ANSI/NFPA 54

Answer

International Building Code

Answer

National Electrical Code

Answer

Uniform Plumbing Code

Question 10

Which code is NOT specifically used for gas piping inspection?

Accepted Answer

International Residential Code (IRC)

Answer

National Fuel Gas Code (NFPA 54)

Answer

Uniform Plumbing Code (UPC)

Question 11

Purpose of Pressure Testing: What is the primary purpose of conducting a pressure test on a gas piping system?

Accepted Answer

To assess the system's ability to withstand gas pressure and identify potential leaks

Answer

To clean the piping system by removing debris or blockages

Answer

To verify the flow rate and pressure distribution within the system

Answer

To calibrate gas appliances connected to the system

Question 12

Non-Gas Piping Material: Which of the following materials is NOT commonly used in the construction of gas piping systems?

Accepted Answer

PVC, commonly used in drain and sewer systems

Answer

Copper, known for its durability and corrosion resistance

Answer

CPVC, a type of plastic piping used in water supply lines

Answer

Galvanized steel, which provides strength and protection against corrosion

Question 13

Function of Gas Piping Appliance Tag: What is the primary function of a gas piping appliance tag?

Accepted Answer

To clearly identify the appliance, its connection status, and any relevant safety information

Answer

To prevent unauthorized tampering with the appliance's settings

Answer

To provide detailed instructions for operating and maintaining the appliance

Answer

To indicate the date of the last inspection or maintenance performed

Question 14

Essential Tool for Cutting Gas Piping: Which tool is indispensable for cutting gas piping accurately and safely?

Accepted Answer

Pipe cutter, specifically designed for cutting metal pipes cleanly and precisely

Answer

Hacksaw, a versatile tool for cutting various materials, including metal pipes

Answer

Drill, used for creating holes and not suitable for cutting pipes

Answer

Measuring tape, essential for determining pipe lengths but not for cutting

Question 15

National Standard for Gas Piping: Which national standard governs the proper installation and testing of gas piping systems in the United States?

Accepted Answer

NFPA 54, the National Fuel Gas Code, which provides comprehensive guidelines

Answer

IRC, the International Residential Code, which covers general building construction

Answer

ICC, the International Code Council, which develops various building codes

Answer

OSHA, the Occupational Safety and Health Administration, which focuses on workplace safety

Question 16

What is the primary purpose of pressure testing gas piping?

Accepted Answer

To ensure the piping system can withstand operating pressure without leaking

Answer

To verify the correct installation of gas appliances

Answer

To detect leaks that are not visible during visual inspection

Question 17

What is the maximum allowable leakage rate for gas piping according to industry standards?

Accepted Answer

0.5% of the total gas volume per hour

Answer

3% of the total gas volume per hour

Answer

1% of the total gas volume per hour

Answer

2% of the total gas volume per hour

Question 18

What is the primary function of a catalytic gas leak detector?

Accepted Answer

To detect the presence of combustible gases

Answer

To verify the functionality of gas appliances

Answer

To pinpoint the exact location of a leak

Answer

To measure the concentration of gas in the air

Question 19

Which tool is commonly used to measure the pressure of gas in a piping system?

Accepted Answer

Gas pressure gauge

Answer

Multimeter

Answer

Flow meter

Answer

Infrared camera

Question 20

What is the primary reason for using a soap solution in gas piping inspections?

Accepted Answer

To detect leaks

Answer

To clean the piping

Answer

To lubricate joints

Answer

To prevent corrosion

Question 21

Which of the following devices is used to measure the pressure in gas piping systems?

Accepted Answer

Manometer

Answer

Thermometer

Answer

Barometer

Answer

Hydrometer

Question 22

What is the main purpose of a gas pressure regulator?

Accepted Answer

To maintain a constant gas pressure

Answer

To measure gas flow rate

Answer

To filter gas impurities

Answer

To shut off gas flow

Question 23

What is the significance of the National Fuel Gas Code (NFGC)?

Accepted Answer

It establishes safety standards for gas piping systems

Answer

It provides guidelines for gas appliance installation

Answer

It regulates the transportation of natural gas

Question 24

Which of the following is a best practice for conducting visual inspections of gas piping systems?

Accepted Answer

Inspect all exposed piping, fittings, and appliances

Answer

Focus only on accessible sections of piping

Answer

Ignore minor imperfections

Question 25

What is the primary legal responsibility of gas piping inspectors?

Accepted Answer

To ensure the safety and integrity of gas piping systems

Answer

To determine the cost of repairs

Answer

To design gas piping systems