Notes J6-J10 Flashcards by Kyle Halverson

Fan-assisted BURNERS overcome the resistance of the ________ only. Remaining flue gases ________ draft out.

Burner

Naturally

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Fan assisted APPLIANCE has a draft through the entire appliance and is not equipped with? and do not need ________ ____

draft control

dilution air

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Draft control requires ________ ____ and is not part of the combustion process

dilution air

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Fan assisted burners require?

draft control and dilution air

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Dilution air is ___cuft per 1000btuh

15cuft

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Natural draft depends on the _________ of the flue gases. It also requires _________ and _________ air

buoyancy

combustion and dilution

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Natural draft appliances typically require which type of venting?

B vent or chimney liner

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Fan assisted burners provide higher combustion ________

efficiency

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Fan assisted burner regulate the ________ air supply fore the burner only

combustion

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In a fan assisted appliance, the fan does not develop _____ pressure. It still depends on ________ for draft

vent pressure

bouyancy

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What device is equipped above a burner in a fan assisted burner appliance to aid in buoyancy?

neutralizing device

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Fan assisted burners are also equipped with _____ _____ to prove the burner fan is on

flow switches

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Why are fan assisted appliances more susceptible to condensation?

Because they provide lower flue temperatures than natural draft

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What is the vent connector?

Attaches the appliance to the chimney

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Vent connectors can be B or C vent. True or False?

True

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Vent connectors may or may not include draft control. True or False?

True

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The main/common/chimney vent, may only be __ vent

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Common vent must be __ vent

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No reducing vent connectors may be used. True or False?

True

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Max lateral length is __” for every 1” diameter of common vent pipe

18”

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Draft is created through a _______ or _________ difference in the system

pressure or temperature

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Draft is mainly affected by?

Height and temperature

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In draft, as height increases, pressure _________

decreases

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The longer the chimney, the greater the pressure difference which results in ________ draft

greater

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Greater height creates more hot gas and rise. True or False?

True

In dampers, a _____ or valve regulates the flow

plate

Gas appliances require flue with draft control to remove what?

products of combustion

What are the three purposes of a draft hood?

1. Neutralize stack effect 2. Provide dilution air 3. Provide spillage relief

Dilution air ____ and ____ the flue gas

slows and cools

Propane tanks are ________ and cylinders are __________

stationary portable

LPG gases are made up of?

Propane and butane

LNG stands for?

Liquid natural gas

Propane tanks up to 1000USWG are built to what spec? (Abbreviation)

ASME

Propane tanks range between 120USWG and ______USWG

1000

All propane tanks have what certification that explains which province or territory in which they can be installed?

C.R.N

Cylinder sizes range from __lb to _____lb

1 to 420lb

1lb camping cylinders are non-refillable. True or False

TRUE

Can gas cylinders be laid on their side?

Why can gas cylinders not be laid horizontal?

The safety valve is immersed in liquid

Cylinders must undergo re-qualification every __ years

Length of the dip tube on a fixed liquid level gauge indicates the max level the cylinder can be filled. True or False?

True

What is the purpose of the 80% refill rule?

To leave 20% space for vapour

It is practical to stop re-filling a cylinder when?

Liquid comes out of the spit valve

Where can you find the information on how long of a dip-tube to install for a specific cylinder?

By the marking on the neck of that cylinder

Vapour service is POL ______ threads and Liquid service is POL _____ threads

female male

Tanks have a pressure rating of ____ or ____ psi

250 or 312psi

Cylinders have a rating of ____ psi

375psi

A vehicle tank pressure rating would be ____psi and a home tank would be ____

312psi 250psi

Cylinders have ____ valve, tanks have _______

one multiple

Less liquid level in a propane cylinder/tank causes additional vaporization which causes what?

a wetted surface

As demand for vapour increases, what is required ?

additional heat

Sweating of the tank, due to a low liquid level, acts as an insulator which makes it even harder to boil. True or False?

True

At -45F, there is zero vapour pressure. True or False?

True

In the winter, why is crucial to have a high level of liquid?

To aid in vaporization due to low ambient temperatures

Two questions you must ask when sizing propane storage?

how fast can we turn liquid to gas? what is the ambient temperature?

Where can information on underground installations be found?

Annex H

Natural gas is stored at ____f, slightly _____ atmospheric pressure

-260f slightly above

Propane cylinder re-qualification must be done by an organization approved by ?

DOT/Transport Canada

It is against the law to refill an outdated cylinder. True or False?

True

Tanks that have been re-qualified will have what marking?

An E on the end date

On permanent tank installs, the regulators are installed where?

First stage at the tank and second stage at the house before entry

How does two-stage regulation reduce freeze-ups?

It mitigates extreme pressure drops

Freeze-ups occur between what temperatures?

35-45f

First stage regulators are normally what colour?

Red

Second stage regulators are normally what colour?

Green

Bonnet vents shall be pointed _______ outdoors. EXCEPT WHEN INSTALLED IN A DOME

downward

When final stage regulator is not equipped with internal relief. One must be installed immediately downstream. True or False?

True

Wood is not acceptable to stand cylinders on. True or False?

True

A hydrostatic relief is for liquid propane lines only. True or False?

True

Vapour is what is needed to provide btuh. Use _________ to help meet your load demands.

Vaporizers.

Underground installations are relatively constant due to?

Constant ground temperatures

Orifices must be cleaned: a) small brush b) small file c) solvents

Digester gas is considered a renewable resource because?

generates no net co2

Intermittent pilot means the pilot burns the entire cycle. True or False

True

What is the max pressure a b fitter can work on? a) 5psig b) 100 psig c) no limit

CEUL is not recognized in BC as being qualified. True or False?

True

If the exhaust vent is blocked the ________ will not allow the burner to run

inducer

Orifice size controls the _________ of gas

volume

Second diaphragm controls?

downstream pressure

Under normal conditions, what tells the fan to shut off in a furnace?

temperature cools down

Vent termination shall 90 and turn _________

downwards

Low water and low gas supply are examples of a limit and a safety. true or False?

True