E1-3 Learning Task Questions

Question 1

What is the safest / most reliable method of transporting natural gas?

Answer 1

Pipeline

Question 2

True or False: Transmission lines are the pipes that move the gas from the city gate station to the customers

Answer 2

False Process plant transports to city gate

Question 3

What is the max pressure of NG in city distribution mains?

Answer 3

680 kPa (100psi)

Question 4

True or False: The release of gas from the liquid storage will reduce the temperature of the remain liquid

Answer 4

False

Question 5

What is the max NG supply pressure to a single - family dwelling?

Answer 5

14 kPa (2psig)

Question 6

True or False: For design purpose the relevant friction loss pressure drop is the difference in gas pressure bn the point of gas supply and the furthest appliance

Answer 6

True

Question 7

What is the max allowable pressure drop in a propane gas piping system with a supply pressure of 14 kPa

Answer 7

7 kPa

Question 8

True or False: Laminar flow is smooth / occurs at low velocities

Answer 8

True

Question 9

True or False: Pipe size does not change the gas velocity

Answer 9

False

Question 10

What gas will have the greatest pressure loss when all other flow factors are equal?

Answer 10

Butane gas (SG 2.)

Question 11

What method can be used to account for the friction loss of fittings?

Answer 11

1) % of pipe length
2) Pressure drop calculations
3) Equivalent length tables

Question 12

What is the name for the process of heat fusing the plain ends of PE pipe?

Answer 12

Butt fusion

Question 13

True or False: CSST tubing may be used as a flexible gas connector if the appropriate end adapters / Quick disconnect fittings are installed

Answer 13

False

Question 14

Copper tubing used for underground service (unless externally coated w/ PVC resin) shall be what min type?

Answer 14

Type K

Question 15

A certified flexible gas connector, used to connect an unvented appliance, must not exceed what lenght?

Answer 15

2m

Question 16

What type of gasket is not permitted in a gas piping system?

Answer 16

Natural rubber

Question 17

Gas piping systems must be welded at what min size?

Answer 17

2 1/2”

Question 18

True or False: A quick disconnect device shall not be used to connect appliances indoors in a residential building?

Answer 18

True

Question 19

True or False: Piping having a nominal diameter of less than NPS 1/2” shall not be used underground

Answer 19

True

Question 20

What is the max length of the type I gas hose that must be used to connect a tube type infrared heater?

Answer 20

1.5m

Question 21

What fittings cannot be used in a gas piping system?

Answer 21

• Street elbow
• Close nipple
• Thread protector couplings

Question 22

True or False: For steel press-connect fittings used on gas systems the internal sealing element is colour coded yellow

Answer 22

True

Question 23

True or False: Flared nuts used on gas systems may be of the brass forged or machined type

Answer 23

False

Question 24

Flare fittings for all copper tubing are based on what tube dimension?

Answer 24

OD

Question 25

On an underground catholically protected piping system the pipe will be considered what component?

Answer 25

Cathode

Question 26

True or False: The greater the pressure drop through a piping system, the more volume of gas being delivered

Answer 26

True

Question 27

True or False: The gas pipe sizing tables in the code book do not limit the amount of pressure drop in the piping system

Answer 27

False

Question 28

True or False: The greater the pressure drop through a piping system the more pressure that is left at the end of the pipeline

Answer 28

False

Question 29

True or False: if the piping system is operated at to great of a pressure drop, the system will be very noisy as the flowing gas could reach sonic velocity

Answer 29

True

Question 30

What is the order that will ensure the proper table is selected?

Answer 30

1) type of gas
2) type of pipe
3) System pressure
4) Pressure drop