Deck 11: Fuel Gas Piping, Fittings, Connections and Pipe Sizing

Question 1

What information can be found on the jacket of corrugated stainless steel tubing?

A)the maximum working pressure, the pipe size, and the tensile strength
B)the pipe size, the tensile strength, and the testing standards and approval agencies
C)the maximum working pressure, the pipe size, and the testing standards and approval agencies
D)the maximum working pressure, the tensile strength, and the testing standards and approval agencies

Answer 1

C

Question 2

When your work is finished, you should always test the fuel gas piping system by approved methods.

Answer 2

True

Question 3

Which of the following is the negative terminal of an electrical device or the area of metal to which current flows?

A)Circuit
B)Cathode
C)anode
D)galvanic anode

Answer 3

B

Question 4

Cast iron fittings 4" or larger cannot be used indoors for fuel gas piping systems.

Question 5

The higher the EHD number, the greater flow capacity of the piping.

Question 6

Corrosion may show up in which form?

A)pitting
B)rusting
C)slabbing
D)all of the above

Question 7

Most residential and similar small commercial fuel gas piping systems operate at a pressure equal to 8" of water column.

Question 8

Which of the following describes a process that takes place in an oxygen-free environment?

A)anaerobic
B)active
C)electrolyte
D)aerobic

Question 9

When sizing fuel gas piping for larger systems, the length of piping from meter to farthest appliance is increased by what percentage to allow for fittings in the pipe run?

A)50%
B)25%
C)75%
D)10%

Question 10

You can bury steel pipe without coatings outdoors.

Question 11

The longest run method for sizing fuel gas piping bases pipe capacities on which of the following lengths?

A)the appliance that is closest to the meter
B)the appliance that is farthest from the meter
C)the appliance that is half the distance to the meter
D)none of the above

Question 12

Concealed joints in fuel gas piping systems can be made up of unions, tubing fittings, running threads, or right and left couplings.

Question 13

CSST cannot be used to direct connect to any movable gas appliance.

Question 14

The gas must be turned off for the portion of the fuel gas piping system that is to be worked on.

Question 15

Which of the following pieces of information is required to properly lay out a gas system?

A)type of gas and its specific gravity
B)length of piping to each appliance
C)gas pressure in the system
D)all of the above

Question 16

When working on a fuel gas piping installation, if an electrical switch is on, you should turn it off.

Question 17

You can mix and match different manufacturers' fittings and tubing when working with corrugated stainless steel tubing (CSST).

Question 18

You can use copper tubing with gas that contains hydrogen sulfide.

Question 19

Which of the following is an electrode that will cause current to travel in one direction to protect a secondary metal from decomposition?

A)ground bed
B)anode
C)electrolyte
D)galvanic anode

Question 20

Which type of corrosion occurs in areas where the material has external or internal forces pushing or pulling against it?

A)preferential
B)electromotive
C)stress
D)battery

Question 21

When a substance that will conduct electricity or allow electrons to flow connects to dissimilar metals, a process known as ____________________ occurs.

A)cathodic protection
B)galvanic action
C)thermoweld
D)stray current

Question 22

The ____________________ is the operating pressure that can be found from the gas meter to the gas valve on the appliance.

Question 23

In the National Fuel Gas Code , how might a prohibited material or method appear?

Question 24

A(n)____________________ is any unpredicted current(s)that flows from one structure to another due to unrecognized and unintended connections between the structures.

A)stray current
B)direct current
C)circuit
D)insulating point

Question 25

When using the longest run method for sizing fuel gas piping, the required piping capacity must be ____________________ as each additional appliance is connected to the system.

Question 26

Corrugated stainless steel tubing is sized not by its internal diameter, but by its effective ____________________.

A)outside diameter
B)equivalent length
C)equivalent hydraulic diameter
D)outside radius

Question 27

Name at least three common fuel gas piping errors.

Question 28

A(n)____________________ is a non-metallic joint to prevent current flow from one piece of pipe to another.

A)insulating point
B)electrolyte
C)ground bed
D)anion

Question 29

____________________ corrosion takes place in or around threads, curves, or welds.

A)preferential
B)electromotive
C)stress
D)battery