Heating I Section#1 Furnace - Gas and Oil Quiz#2

This study session deals with the methods of heat transfer and gas piping and meters.

The estimated completion time for this study session is sixty minutes.

Objectives
At the end of this study session, you should be able to:

• List and describe the three methods of heat transfer.
• List the seven major components of a gas furnace.
• List nine possible problems you may find with gas piping.
• List eight possible problems you may find with gas meters

List 5 gas meter conditions you should watch for.

1. Rust

2. Mechanical damage

3. Gas shut off or locked

4. Ice build-up

5. Undersized

6. Poor access

7. Leaks

8. Poor location

List 5 of the components of a gas furnace.

1. Fuel system (steel piping or copper)

2. Combustion air delivery system

3. Burner, including gas valve, pilot and maybe pressure regulator

4. heat exchanger

5. Controls

6. Venting system

7. Distribution system

List 6 gas piping conditions you should watch for.

1. Leaks

2. Inappropriate materials

3. Inadequate support

4. Rusting

5. No drip leg

6. Missing shut-off valve

7. Improper connections

8. Plastic pipes exposed above grade

9. Piping in chimneys or duct system

10. Copper tubing not properly labeled. 

One half inch diameter black steel piping should be supported every _____ feet, unless it is rising vertically, in which case it must be supported every _____

6 feet, and at every floor when rising vertically.

My answers:

1 1/4 to 2 1/2 inch piping should be supported every 10 feet. 

1/2 inch diameter piping or less should be supported every 6 feet

3/4 inch and 1 inch piping should be supported every 8 feet

What is the purpose of the drip leg?

To collect dirt, separating it from the gas before it gets to the gas valve.

My answer:

It is intended to catch foreign materials before it gets into gas valves, burners and etc. The first appliance downstream of the meter must have one and in some areas every appliance needs one.

Which methods of heat transfer are used by hydronic systems?

Radiation, and convection

Bonding the gas piping to the supply plumbing system means that:

any stray electrical current will not cause arcing, which could ignite the gas

Gas meters located below the drip line of a roof are particularly susceptible to:

ice build-up in winter

Warm air rising off the pavement on a hot day would be heat transfer by

convection

Our Standards require us to inspect gas meters.

False