Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
53 Cards in this Set
- Front
- Back
What is an excess flow valve? |
A valve that shuts off flow of gas when flow exceeds a predetermined amount. A small hole allows trace amounts to escape, equalizing pressure. This is a safety in case a hose is severed. |
|
What is Tare weight? |
Weight of cylinder when empty. |
|
What is the purpose of a spit valve? |
The determine when the cylinders full. |
|
What is the purpose of an OPD? |
To prevent the cylinder form over filling. |
|
How does an OPD work? |
Uses a special float that rises during refilling to block the filling process when the cylinder is 80% full. |
|
When is a plug or cap required in the valve or propane cylinder? |
When it has propane in it. |
|
What is the maximum size of the bleed opening in a spit valve? |
Orifice size 54 |
|
What is the minimum distance the combustibles ( weeds and grass included) must be kept clear of a Propane Cylinder? |
10 feet |
|
What must be done with a brand new cylinder before filling? |
Purged of moisture and Air |
|
What is the purpose of a line relief device ? |
To protect appliances and equipment from over pressuring |
|
When a propane vent line discharges vertically upwards , what is required on the outlet end? |
A loose fitting cap |
|
Where should a relief valve in a cylinder be located ? |
So that it communicates with the vapour space . |
|
What is required to be put into a valve on a Propane cylinder that has a capacity of 45lbs or less? |
A cap or Plug |
|
What type of connection is required for a valve that is liquid withdrawal? |
Any connection other than a POL |
|
In the specification CTC 4BA240, what does the 240 stand for? |
Minimum rated working pressure. |
|
What is the maximum filling density for a cylinder by volume ? |
80% |
|
How much propane can be dispensed into a cylinder with a WC of 238? |
238 x 0.42= 99.98 100lbs |
|
What is the weight of a cylinder with a WC of 48 and a TW (tare weight) of 17.6 when properly filled? |
48x0.42+17.6=37.76 |
|
What kind of connection is required for a valve that is liquid withdrawal? |
Any connection other than a POL. |
|
What piece of equipment must be used in conjunction with a propane cylinder when a cylinder is used on a construction site? |
A pressure regulator |
|
Where can a cylinder not be placed for use in a construction site? |
In a stairway |
|
Where must a cylinder not is use be stored? |
Outdoors |
|
What is the minimum distance between a cylinder relief valve and a building opening below the relief valve? |
3 feet/1 m |
|
How many cylinders connected together to form a system can be installed against the wall of a building? |
4 |
|
What’s the maximum size of a propane cylinder that may be used indoors without permission from the authorities having jurisdiction? |
5 lbs |
|
Which location is not acceptable for the installation of propane cylinders? |
Below Grade |
|
What is the significance of the Q-CC1 propane cylinder valve over the standard POL valve? |
It has an excess flow valve |
|
What is the importance of the OPD? |
Prevents accidental over filling of a cylinder |
|
Separate filler valves have 2 Back check valves incorporated into them. One is a metal to metal seat. What is the other check valve seat? |
Neoprene to Metal |
|
On construction sites , what is required to be used with all propane cylinders larger than 1 pound propane capacity? |
An excess flow valve |
|
What is the purpose of the bypass hole in the excess flow valve? |
To allow the valve to return to its open position. |
|
Why is the excess flow valve installed? |
To control the flow of propane in case of a line breakage or rupture |
|
How frequently should an excess flow valve be tested? |
When it is installed and annually after that. |
|
What is the function of the pressure relief valve? |
To protect the cylinder from over pressure. |
|
TC , CTC and BTC signify a Propane cylinder was manufactured in _________ |
Canada |
|
Cylinders made in the USA will be certified by either ______ or ____. |
DOT ICC |
|
Six things a cylinder will be stamped with. |
Tare weight Date of manufacture Serial number Tare weight Water Capacity (WC) Retest dates |
|
Length of hose connecting a propane cylinder to a construction heater must be minimum ______ and max _____ |
15 feet 75 feet |
|
Cylinders must be painted with colours that are _______ and _____ |
Light Reflective |
|
Temperature Propane will vaporize |
-44. •F -42•C |
|
How many BTU per pound of propane does it take to cause vaporization without raising the temperatures the propane liquid |
54 BTU |
|
The factors that determine the vaporization rate of a propane cylinder are: |
Wetted surface area Ambient temperature Colour of the cylinder The material the cylinder is constructed of Wind exposure causing wind chill |
|
What is the minimum service clearance Of a category I appliance ? |
24” |
|
What must be done before reconnecting an appliance that has been damaged by flood or fire? |
Get permission from the authorities having jurisdiction |
|
What is the minimum service clearance for a gas appliance ? |
24 inches |
|
What is the minimum distance between the floor of a residential garage and a component in an appliance capable of igniting a flammable vapour? |
18” |
|
What is the minimum distance between a swimming pool heater and a property line? |
18 inches |
|
What is the minimum size access panel to allow a person to enter a crawl space to service an appliance? |
24”X30” |
|
What is the minimum size of a passageway leading to an appliance? |
36X36” |
|
Where can a direct fired make up air unit not be installed ? |
In an area where large amounts of air are exhausted such as a welding shop |
|
How high above a residential garage floor must a unit heater be installed without protection? |
8 feet |
|
What is the minimum distance required to the front of a boiler from an obstruction like a wall? |
48” |
|
When connecting to a range , what is the max length of the flex connector? |
6 feet |