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Andrew > 080203aA > Flashcards

080203aA Flashcards

1
Q

What is the typical pressure of low pressure natural gas? What is its maximum allowable pressure drop?

A

7”-14” w.c.

1” w.c. Maximum pressure drop

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2
Q

What is the maximum pressure between the first and second stage regulator on a propane system?

A

10 psi

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3
Q

What is the typical pressure of low pressure propane? What is its maximum allowable pressure drop?

A

11” w.c.

1” w.c. maximum pressure drop

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4
Q

If a gas installation cannot provide enough gas to an additional appliance, and upsizing the excising gas main is not practical, what may be a solution?

A

A new branch may be installed as long as it is with 24” of the meter outlet

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5
Q

Can material that has been used on previous gas installations be reused?

A

Yes, provided it has been cleaned, inspected and ascertained to be equivalent to new material by the person doing the work

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6
Q

Threaded SCH40 steel gas pipe is rated for what maximum pressure?

A

125 psi

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7
Q

What is the maximum pressure allowed on standard malleable (class 150) fittings?

A

125 psi

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8
Q

What is the maximum pressure allowed on malleable iron (class 300) fittings?

A

300 psi

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9
Q

When brazing copper tubing, what must the melting point of the brazing alloys be?

A

1000°F

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10
Q

When using compression fittings with ferrules on copper tubing, what provision must be made?

A

Must use a double ferrule system

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11
Q

All fittings used on copper gas line installations must be pressure rates for…

A

125 psi

Gas pressures about 125 psi require fittings designed for 250 psi

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12
Q

Name the copper types that may be used…

A

Above Ground
K, L, G

Underground
K

Types L and G are approved for underground only if they have been factory-coated with a PVC resin or extruded polyethylene

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13
Q

What is the only approved plastic pipe for gas?

A

Polyethylene

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14
Q

Where is the only place plastic polyethylene gas pipe may be installed?

A

Outdoors underground

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15
Q

Polyethylene is not conductive. What must be done in order to be able to locate it once it is burried?

A

14 gauge tracer wire

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16
Q

Where must polyethylene not be used in regards to propane?

A

Liquid propane installations

Cannot be used for the first 10’ downstream of a propane vaporizer

17
Q

The minimum rated working pressure for a hose and hose fittings is?

A

350 psi

18
Q

What is the maximum length of a hose on a permanent installation?

A

10’

19
Q

What is the minimum/maximum length of a hose on a construction heater?

A

15’ min

75’ max

20
Q

What is the maximum length of a hose on a portable appliance (barbecue)?

A

30’

21
Q

A hose should not be subject to temperatures exceeding?

A

125°F (50°C)

22
Q

A hose used on an infrared tube heater must be how long?

A

36” long + or - 6”

23
Q

CSST(Gas tite) and tubing that are run inside a wall must be protected from damage by what?

A

16 gauge metal protection plates

24
Q

What is the largest size of gas line that may be threaded?

A

2”

25
Q

How many sizes must you reduce when using malleable bushings?

A

2 or more sizes

26
Q

What is the maximum length of a flex connector on a vented appliance?

A

2’

27
Q

What is the maximum length of a flex connector on an unvented appliance?

A

6’

28
Q

Can you pass through a wall, ceiling, floor or partition with a flex connector?

A

No this is not permitted

29
Q

How much unthreaded pipe must be exposed when it protrudes through a ceiling or wall?

A

At least 1”

30
Q

How much unthreaded pipe must be exposed when it protrudes through a floor?

A

At least 2”

31
Q

All gas lines must be buried at least how deep?

A

15”

24” for commercial installations where a gas line traverses a driveway or parking lot

32
Q

Gas lines that are covered with concrete or paving what extends horizontally more than ___ over the line require what?

A

25’

Must have a vent/inspection point provided

33
Q

Commercial buildings require colour coding markings how often?

A

Every 20’

34
Q

Copper tubing installed in a residential application must have yellow bands every how many feet?

A

6’

35
Q

Residential appliances may have the gas cock installed on the horizontal finish piping as long as is located within…

A

2’ of the appliance

36
Q

How far away may the gas cock be located from an appliance?

A

Up to 50’ away as long as it is accessible and clearly tagged

37
Q

What kind of valves must be used on gas piping or tubing 1” and larger and where gas pressure exceeds 0.5psig?

A

Ball valves, eccentric valves or lubricated plug valves

38
Q

What page in the gas code can you find hanger spacing?

A

Pg.43

Andrew (4 decks)

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