Combustion basics
These are the three elements required for combustion
What is fuel, oxygen and heat
Typical residential natural gas supply pressure.
What is 7" WC
This material is not allowed to be used for gas fitting
What is cast iron
When sizing a gas system the type of pipe is not needed
What is false
High fire is described as what?
What is the maximum fire rate
This is the Ideal air to gas ratio for natural gas
What is 10:1
Typical gas pressure for transmission lines
What is 5000-8000kpa(800-1200psi)
These nipples are prohibited
What are close nipples
A 2 psig system is considered a ______ pressure system
What is low pressure
Port loading is refered to as what?
What is the amount of gas to air mixture passing through a burner to make a stable flame
The main products of combustion are?
What are carbon dioxide and water vapor
At the gate station the pressure is reduced to
What is 690kpa (100psi)
This practice of installing reducers within eachother is not allowed
What is nesting bushings
Anything connected within the first 2' of entering the building is considered a
What is a manifold
An atmospheric burner relies on this principal to supply gas
What is the venturi effect
The dangerous gas created during incomplete combustion
What is carbon monoxide
single family dwelling is limited to a max of
What is 14kpa (2psig)
When flaring gas lines a _______ nut is allowed while a _______ is not.
What are brass flared and forged
This length of pipe is used to find the code zone
What is the lmr
Induced draft burners use draft produced by a fan located here
What is downstream
This colour of flame indicates proper combustion
What is blue
Industrial and commercial applications range from
What is 35-140kpa (5-20psig)
A quick disconnect is allowed if it has a what
What is an internal shut off
A system over 2psig is considered what
what is high pressure
This type of flame is neither reducing nor oxidizing and is desirable for combustion
What is neutral