E1-3 Learning Task Questions Flashcards
What is the safest / most reliable method of transporting natural gas?
Pipeline
True or False: Transmission lines are the pipes that move the gas from the city gate station to the customers
False Process plant transports to city gate
What is the max pressure of NG in city distribution mains?
680 kPa (100psi)
True or False: The release of gas from the liquid storage will reduce the temperature of the remain liquid
False
What is the max NG supply pressure to a single - family dwelling?
14 kPa (2psig)
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
True
What is the max allowable pressure drop in a propane gas piping system with a supply pressure of 14 kPa
7 kPa
True or False: Laminar flow is smooth / occurs at low velocities
True
True or False: Pipe size does not change the gas velocity
False
What gas will have the greatest pressure loss when all other flow factors are equal?
Butane gas (SG 2.)
What method can be used to account for the friction loss of fittings?
1) % of pipe length
2) Pressure drop calculations
3) Equivalent length tables
What is the name for the process of heat fusing the plain ends of PE pipe?
Butt fusion
True or False: CSST tubing may be used as a flexible gas connector if the appropriate end adapters / Quick disconnect fittings are installed
False
Copper tubing used for underground service (unless externally coated w/ PVC resin) shall be what min type?
Type K
A certified flexible gas connector, used to connect an unvented appliance, must not exceed what lenght?
2m
What type of gasket is not permitted in a gas piping system?
Natural rubber
Gas piping systems must be welded at what min size?
2 1/2”
True or False: A quick disconnect device shall not be used to connect appliances indoors in a residential building?
True
True or False: Piping having a nominal diameter of less than NPS 1/2” shall not be used underground
True
What is the max length of the type I gas hose that must be used to connect a tube type infrared heater?
1.5m
What fittings cannot be used in a gas piping system?
- Street elbow
- Close nipple
- Thread protector couplings
True or False: For steel press-connect fittings used on gas systems the internal sealing element is colour coded yellow
True
True or False: Flared nuts used on gas systems may be of the brass forged or machined type
False
Flare fittings for all copper tubing are based on what tube dimension?
OD
On an underground catholically protected piping system the pipe will be considered what component?
Cathode
True or False: The greater the pressure drop through a piping system, the more volume of gas being delivered
True
True or False: The gas pipe sizing tables in the code book do not limit the amount of pressure drop in the piping system
False
True or False: The greater the pressure drop through a piping system the more pressure that is left at the end of the pipeline
False
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
True
What is the order that will ensure the proper table is selected?
1) type of gas
2) type of pipe
3) System pressure
4) Pressure drop
