GAS Flashcards
How far past a finished floor must the unthreaded portion of a gas pipe extend?
2”
What is the largest diameter of gas pipe that can have threaded joints?
2”
What is the minimum height above a roof penetration for a vent terminal?
2’
When can a manual vent damper be installed?
Only in a commercial application on appliances without a draft hood
What is the maximum length of a connector for a clothes dryer?
6’
What is the minimum clearance between a single wall vent connector and a combustible material?
6”
What is the minimum distance away from an openable window for a direct vent appliance with an input of 75,000 BTU?
12”
How is a direct vent appliance identified?
Always has an exhaust and an intake piped to outdoors
In what two states can propane be stored?
Liquid and vapour
Why can a fan assist appliance use a smaller air supply than a draft hood appliance with the same input?
Fan assist appliances do not require dilution air
What is the maximum length of a 4” single wall vent connector with two 90° elbows installed on a Category 1 appliance?
6’
What joining method is not permitted for gas lines?
Soldering
What is the minimum test pressure when pressure testing a low pressure gas installation?
15 psi
How much combustion air is required to burn 100,000 Btu’s of CH4?
1000 cubic feet
Why must a masonry chimney be lined when connecting a gas fueled appliance?
Condensation in the chimney will ruin mortar joints
What is the calorific value of propane as a liquid?
109560 BTU/imperial gallon
What shall be done with used fittings before re-using them on a new gas installation?
The must be inspected and ascertained to be as good as new
What marking is important for a decorative appliance designed to be installed in a fireplace?
FOR USE IN NONCOMBUSTIBLE FIREPLACES
How much of the thermocouple tip should be in the pilot flame?
3/8” to 1/2” of the tip
What is the minimum distance between a vent terminal and a mechanical air intake?
6’
What protection is required when a single wall venting material passes through a combustible ceiling?
6” clearance all the way around
What is the minimum bury depth of a gasline in a residential installation?
15”
What must be done to an appliance that has been involved in a fire or flood before it can be returned to service?
The appliance must be inspected
What does the abbreviation LPG mean?
Liquefied petroleum gas