Gas Piping Materials: Types, Properties, and Applications

Question 1

What major advantage does copper offer for gas piping applications?

Accepted Answer

Corrosion resistance

Answer

Flexibility

Answer

Enhanced strength

Answer

Ease of installation

Question 2

Among plastic piping options, which type is specifically designed for natural gas distribution systems?

Accepted Answer

PE (Polyethylene)

Answer

PVC (Polyvinyl chloride)

Answer

CPVC (Chlorinated polyvinyl chloride)

Answer

PEX (Cross-linked polyethylene)

Question 3

What is a key disadvantage associated with utilizing black iron for gas piping?

Accepted Answer

Susceptibility to corrosion

Answer

High cost

Answer

Difficulty in bending

Answer

Requires specialized tools for installation

Question 4

In gas piping systems, which fitting is used to connect two black iron pipes at a 90-degree angle?

Accepted Answer

Elbow

Answer

Tee

Answer

Cross

Answer

Union

Question 5

What is the primary purpose of a dielectric union in a gas piping system?

Accepted Answer

Preventing galvanic corrosion

Answer

Accommodating thermal expansion

Answer

Sealing leaks

Answer

Providing a convenient connection point

Question 6

What is a key advantage of utilizing plastic for gas piping?

Accepted Answer

Flexibility and ease of installation

Answer

Resistance to corrosion

Answer

High strength and durability

Answer

Low cost and availability

Question 7

What is a potential disadvantage associated with using black iron for gas piping?

Accepted Answer

Susceptibility to corrosion

Answer

High weight and difficulty of handling

Answer

Low pressure capacity

Answer

Expensive and difficult to obtain

Question 8

Which code or standard governs the installation of gas piping in the United States?

Accepted Answer

National Fuel Gas Code (NFGC)

Answer

International Building Code (IBC)

Answer

Uniform Plumbing Code (UPC)

Answer

American Society of Mechanical Engineers (ASME) Code

Question 9

Which type of joint is typically used to connect black iron gas piping?

Accepted Answer

Threaded joint

Answer

Soldered joint

Answer

Compression joint

Answer

Brazed joint

Question 10

What is the recommended spacing for pipe supports in a horizontal gas piping run?

Accepted Answer

Every 24 inches

Answer

Every 12 inches

Answer

Every 18 inches

Answer

Every 36 inches

Question 11

Which type of plastic piping is commonly employed in gas distribution lines?

Accepted Answer

Polyethylene (PE)

Answer

Chlorinated polyvinyl chloride (CPVC)

Answer

Cross-linked polyethylene (PEX)

Answer

Polybutylene (PB)

Question 12

When selecting a gas piping material for a specific purpose, what crucial factor must be considered?

Accepted Answer

Pressure and temperature requirements

Answer

Corrosion resistance

Answer

Pipe dimensions and fittings

Answer

Cost and availability

Question 13

What is the primary purpose of using transition fittings in gas piping systems?

Accepted Answer

To connect pipes of dissimilar materials

Answer

To alter the pipe's direction

Answer

To reduce system pressure

Answer

To enhance flow rate

Question 14

Which gas piping material is flexible and often used for appliance connections?

Accepted Answer

Corrugated stainless steel tubing (CSST)

Answer

Black iron

Answer

Copper

Answer

Plastic

Question 15

Which type of copper piping is most commonly used for gas piping in homes?

Accepted Answer

Type L

Answer

Type M

Answer

Type K

Answer

Type DWV

Question 16

What is the primary reason for using a thread sealant on threaded gas piping connections?

Accepted Answer

To prevent leaks

Answer

To provide lubrication

Answer

To increase strength

Answer

To enhance corrosion resistance

Question 17

Which of the following is NOT a safety precaution that should be taken when working with gas piping?

Accepted Answer

Smoke near the work area

Answer

Use proper ventilation

Answer

Wear eye protection

Answer

Test piping for leaks

Question 18

Which gas piping material is commonly used for underground installations because it resists corrosion?

Accepted Answer

Black iron pipe

Answer

PEX pipe

Answer

PVC pipe

Answer

Copper pipe

Question 19

What is a major drawback of using black iron pipe for gas piping?

Accepted Answer

Susceptibility to rust and corrosion

Answer

Limited availability

Answer

High installation cost

Answer

Potential for leaks due to pipe movement

Question 20

Which type of gas pipe is known for its flexibility and ease of installation?

Accepted Answer

PEX pipe

Answer

Copper pipe

Answer

CPVC pipe

Answer

Black iron pipe

Question 21

Why is copper pipe often preferred for gas piping in residential applications?

Accepted Answer

Its resistance to corrosion and durability

Answer

Its ability to withstand high temperatures

Answer

Its flexibility and ease of installation

Answer

Its low cost compared to other materials

Question 22

Which gas piping material is often used for natural gas lines in areas prone to freezing temperatures?

Accepted Answer

PEX pipe

Answer

Black iron pipe

Answer

PVC pipe

Answer

Copper pipe

Question 23

What is a critical factor to consider when using plastic piping materials for gas applications?

Accepted Answer

The temperature rating of the material

Answer

The availability of the material

Answer

The aesthetics of the material

Answer

The cost of the installation