Gas Installation

Question 1

One boiler horsepower is equal to?

Answer 1

33,475 btu

Question 2

A residential hot water heater has a pressure relief valve pre-set to?

Answer 2

30psig

Question 3

Make up water to a hot water boiler is installed with a _____________ ___________ _________ to maintain a safe operating pressure on the boiler controls and piping system

Answer 3

Pressure reducing valve

Question 4

Accessories, controls, and piping for the type of fuel used to fire the boiler are referred to as?

Answer 4

Boiler trim

Question 5

Materials used in the construction of boilers are?

Answer 5

Cast iron and steel

Question 6

The term boiler closed vessel

Answer 6

?

Question 7

Chemical make up of methane

Answer 7

CH4

Question 8

Heat content of natural gas is generally accepted as?

Answer 8

1000 BTUs

Question 9

What is added to natural gas as an odorant for safety purposes?

Answer 9

Mercaptan

Question 10

First gas distribution company was?

Answer 10

In London in 1812

Question 11

Natural gas and propane are

Answer 11

Non-toxic, tasteless, odorless, colorless, and invisible

Question 12

Natural gas contains how much methane?

Answer 12

87.4%

Question 13

Heat sources can be physical chemical or mechanical, combustion is?

Answer 13

Chemical

Question 14

27.7” WC is how many psi?

Answer 14

1 PSI

Question 15

Incomplete combustion produces?

Answer 15

Carbon monoxide, water vapor, aldehydes

Question 16

____________ is required in the combustion air requirements

Answer 16

Excess air

Question 17

Gas regulators are designed to maintain?

Answer 17

Constant downstream pressure

Question 18

When heating a thermocouple, a pilot flame is applied to the _____ ____________ to produce thermoelectricity

Answer 18

Hot junction

Question 19

How many millivolts are produced if a thermocouple is good

Answer 19

30 MV

Question 20

Electrical control systems may be powered by what voltages

Answer 20

Millivolts, 24v, or line voltage 110

Question 21

What should be used to pressure test a fuel gas system?

Answer 21

Inert gas or air

Question 22

Appliance controls, shut off valves, meters, and regulators should not be subjected to?

Answer 22

High pressure testing

Question 23

Purpose of regulator vent hole

Answer 23

To allow air to escape or enter as the diaphragm moves up and down, also allows gas to vent if diaphragm ruptures

Question 24

State of Colorado doesn’t allow gas to be run in what material?

Answer 24

Cast iron

Question 25

Teflon tape is not recommended on steel pipe for gas installation

Answer 25

True

Question 26

Gas piping on roofs or in corrosive areas must be?

Answer 26

Painted or coated

Question 27

What must be installed on the outside of buildings incase of emergencies?

Answer 27

Emergency shut off valves

Question 28

why are compressor stations used on natural gas pipelines

Answer 28

used to recompress gas to maintain constant pressure and to overcome pressure loss created by friction in the pipeline

Question 29

where when and what length was the first successful natural gas line in North America

Answer 29

Newton Feild to Titusville Pensylvania, 1873, 5 miles long

Question 30

what is a hydrocarbon

Answer 30

naturally occurring mixture of hydrogen, carbon, and other gasses

Question 31

name and give the two most commonly used fuel gasses in North America

Answer 31

Methane =CH4 Propane=C3H8

Question 32

name the odorant in natural gas and propane, and why its used

Answer 32

mercaptan, so the gas is identifiable if present

Question 33

what is the specific gravity of propane, why is it dangerous

Answer 33

.51, because it is heavier than air so it settles in low places and on the ground where you cant smell it

Question 34

what do the three sides of the combustion triangle represent

Answer 34

fuel, oxygen, heat, these three components are necessary for combustion to occur