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Term 3: Lvl. 4 Gas - Exam #2 > J10 PPT 1 + 2 > Flashcards

J10 PPT 1 + 2 Flashcards

1
Q

What are the liquified petroleum gases?

A

Propane and butane

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2
Q

Difference between a tank and cylinder?

A

Tank is for permanent storage and cylinder for transport

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3
Q

How is the weight of propane tanks categorized?

A

U.S water gallons (USWG)

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4
Q

1 USWG = ______lbs

A

8.33lbs

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5
Q

For residential and commercial customers. Propane tanks weigh between ____USWG and ______USWG

A

120-1000 USWG

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6
Q

Tanks up to 1000USWG are built to what specification?

A

ASME

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7
Q

What is the purpose of the C.R.N number on a propane tank nameplate?

A

Province or territory it can be installed. (B.C is #1)

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8
Q

Propane cylinders range anywhere between __lb to ____lb

A

1-420lb

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9
Q

Why can propane tanks not be laid horizontally?

A

The safety valve is immersed in liquid

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10
Q

Propane cylinders must undergo re-qualification every ___ years

A

10

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11
Q

Re-qualification and remarking of a refillable propane cylinder shall be done by qualified persons registered with _______ _________

A

Transport Canada

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12
Q

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

A

True

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13
Q

Where to find information about propane dip tub length?

A

Annex G

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14
Q

Propane vapour service is a standard _______ POL thread

A

female

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15
Q

Propane liquid service is a standard ________ POL thread

A

male

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16
Q

Propane liquid and vapour service (standard used today) has the threads on ______ sides

A

both

17
Q

Safety relief valve rating for a propane tank is _____-______psi

A

250-312psi

18
Q

Propane relief valves relieve pressure from the ________ space of the tank

A

vapour

19
Q

Propane storage vessels are filled to ___% of the capacity.

A

80%

20
Q

Propane storage cylinders filled shall be ___% liquid and __% vapour

A

80% liquid

20% vapour

21
Q

Liquid propane spits out when it reaches the point of the inlet of the spit valve. Up until that point, only vapour releases. True or False?

A

True

22
Q

Cylinders that are more full provide ________ vaporization rates

A

higher

23
Q

When the demand for propane vapour increases, more _____ is required.

A

Heat

24
Q

If air is high humidity, the cool air may condense on the wetted surface of the propane bottle and freeze, which acts as an __________ and reduces the ___________ rate

A

insulator

reduces

25
Q

Why does the wetted surface decrease the vaporization rate?

A

Vaporization requires heat and the wetted surface acts as an insulator

26
Q

Two important factors when sizing propane storage?

A
  1. combined burner inputs (btuh).
    how fast can we turn liquid into gas
  2. Ambient temperature (affects vaporization rate)
27
Q

How does ambient temperature affect the propane cylinder/tank?

A

Affects the vaporization rate

28
Q

At -45F, propane has __ vapour pressure

A

0

29
Q

Containers installed above ground can be influenced by the outside temperature, wind patterns, direct sunlight as well as winter cold air. ALL influence the _________ rate.

A

vaporization rate

30
Q

What is the benefit of installing a propane container underground?

A

Relatively constant temperatures underground

31
Q

Natural gas is stored at
_____f. At slightly _______ atmospheric pressure. Nat gas can not be liquified above -116f.

A

-260f

above

32
Q

To store natural gas in it’s liquid state all substances that liquefy must be removed to prevent?

A

plugging up of the lines

33
Q

What does LNG stand for?

A

liquid natural gas

34
Q

LNG lower mainland plant can liquefy ___________ cu ft of natural gas per day

A

3,500,000

35
Q

Liquifying procedure

  1. Removed products are reintroduced when we convert it back to the _______ state
  2. Work done by _______ or regasifiers
  3. Capable of converting __ million cu ft of gas per day back into transmission lines
A
  1. gaseous
  2. vaporizers
  3. 50
36
Q

What is Boyles law?

A

P1V1 = P2V2

37
Q

When sizing an orifice for burners; the smaller the number the _________ the orifice

SAME AS AWG WIRING

A

bigger

38
Q

Higher K factor means _______ efficiency

A

higher

Term 3: Lvl. 4 Gas - Exam #2 (9 decks)

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