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HVAC 261 > Gas Piping > Flashcards

Gas Piping Flashcards

1
Q

Schedule 40 (s-40) will sustain what pressure

A

150 PSI

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2
Q

What material can be used in gas pipe by code

A

Steel
Copper
Plastic
Black iron

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3
Q

Most common material used in gas piping ?

A

Black Iron Pipe

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4
Q

Are close nipples permitted to be used on gas piping

A

No, the code does specifically prohibit the use of close nipples

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5
Q

On a thread, what is the included angle

A

60 degrees

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6
Q

The thread cut on the outside wall of pipe is know as ?

A

Male or external thread

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7
Q

What are the two type of pipe cutter used in the ILM

A

Single Wheel
Multi wheel

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8
Q

What is the approximate for 1/2 and 3/4 inch thread

A

3/4 inch thread to be cut
14 thread per inch
10.5 thread
4.75 hand tight
3 wrench tight

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9
Q

What reamers should never be used with power drive

A

Spiral Reamers

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10
Q

Reamers are available as

A

straight-fluted, Spiral

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11
Q

What is a reamer for ?

A

Remove internal Bur

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12
Q

Why should you oil the threader and pipe during the process

A

A generous amount of thread-cutting oil is the best safeguard against poor threads, excessive die wear, clearing debris build up and heat.
It also makes the job easier by reducing the friction between the die and pipe

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13
Q

When must you stop threading.

A

Faces of the dies are flush with the end of the pipe or manufacturer recommendations.

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14
Q

What will happen if you continue to thread beyond the flush point.

A

You will make a straight or running thread in addition to the taper

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15
Q

What are black iron fittings referred as

A

Malleable

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16
Q

Are black iron fittings the same size as black iron pipe

A

yes

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17
Q

What class is used for fittings in our course

A

Class 150

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18
Q

How do you give the size of a tee

A
  1. Run
  2. Run
  3. Branche
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19
Q

Purpose of a union is to

A

Allow for easy and quick assembly and disassembly of piping system

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20
Q

What is the minimum lenght of a drip pocket

A

3”

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21
Q

Is the nesting of Bushings prohibited

A

Yes

22
Q

How must Teflon tape be applied to the pipe thread

A

Clockwise, with a 50% overlap leaving the first two thread bare.

23
Q

Is white plumbing Teflon approved for gas use

A

no

24
Q

All tapes and joining compounds must be approved for gas use (T/F)

A

Yes

25
Q

Name the three types of pipe wrenches

A

Straight
Offset
End

26
Q

What could happen if joints are over tightened

A

Could result in leak or break

27
Q

Does the dirt pocket need to be accessible

A

Yes

28
Q

Does the drip pocket need to be the same size as the drop

A

yes

29
Q

Can you reuse piping material

A

yes, as long as you have thoroughly clean and inspected the pipe

30
Q

What must you not use for leak detection

A

Open Flame

31
Q

What are the main advantages of copper used for gas piping

A

Malleable, ductile and good resistance to corrosion

32
Q

What size does copper roll come in

A

10,25,50,100 feet

33
Q

Type K copper specs

A

Thickess wall, code green

34
Q

Type L copper specs

A

Medium thick wall, blue

35
Q

Type M copper specs

A

lighter wall, can’t be used in gas line, can’t be bent

36
Q

When can aluminium tubing be used ?

A

typically run between gas valve and pilot

37
Q

What must be done once copper tube is cut

A

Must be reamed

38
Q

What does CSST stand for?

A

Corrugated Stainless Steel

39
Q

Can CSST be installed in direct contact with the ground

A

No

40
Q

What must be done before installing an appliance

A

Always read manufacturer instruction

41
Q

Who is responsible of the safe operation of the appliance

A

The installer

42
Q

What must be present on the appliance for it to be used

A

Rating Plate

43
Q

Who’s responsability it is to make sure replacement part are equivalent to the original

A

Whoever is doing the installation of said component

44
Q

Can a residential heat exchanger be repaired

A

Only temporarily and must be replaced

45
Q

Is aluminium acceptable as gas piping material

A

No, it is not acceptable. But allowed to be used for pilot gas tubing and vent lines

46
Q

Steel gas line installed on rooftop must be painted ?

A

yes 6.16

47
Q

Shortest nipple used in a gas line is

A

Space Nipple

48
Q

What do you use soapy liquid for

A

Checking for Gas leak

49
Q

Which elbow is not allowed in gas installation

A

Street Elbow

50
Q
A

HVAC 261 (3 decks)

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