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Pipefitter License > Flashcards > Flashcards

Flashcards

1
Q

45 Q
What types of connections are allowed on boilers?

A

Tapped (threaded) bolted flange or welded (socket or butt) but not victaulic

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2
Q

What are the minimum connections for feed water piping in power boilers?

A

Less than or equal to 100 sq. ft water heating surface ½ “NPS
Greater than 100 sq. ft water heating surface ¾” NPS

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3
Q

1 Q
What is hanger spacing on 6 inch pipe?
Water -
Gas -

A

Water — 17
Gas — 21

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4
Q

3Q
What is required when pressure in the discharge pipe can exceed pressure in the inlet pipe?

A

A check valve in the discharge line

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5
Q

5 Q
Why does each gauge connection need a syphon (pigtail)?

A

To develop and maintain a water seal that will prevent steam from entering the gauge tube

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6
Q

11 Q
At what size must hangers be designed to permit adjustment while supporting load?

A

Greater or equal to 2 1/2 inches

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7
Q

48 Q
What is the common length that pipe comes?

A

22 feet

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8
Q

49 Q
What is the approximate hanger rod size

A

2” and less — 3/8
2-1/2 and greater — 1/2

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9
Q

50 Q
What is the approximate support spacing for 6 inch NPS for water and for air/steam?

A

Water — 17 foot
Air/steam — 21 foot

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10
Q

51 Q
Socket weld flanges may be used up to what size?

A

3 inch NPS 600 lbs

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11
Q

52 Q
When is a journeyman pipefitter license required for anyone installing repairing replacing maintaining or altering any apparatus for piping appliances devices or accessories for heating systems?

What chapter is this listed?

A

For systems in excess of 700,000 btu per hour

Chapter 146

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12
Q

53 Q
What acceptable method of meeting the requirements for internal inspection and cleaning shall be made for steam and water connections to a water column?

A

Fitting with a back outlet at each right angle turn

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13
Q

54 Q
What is required when 2 or more traps discharge into the same header?

A

A stop valve in each discharge line

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14
Q

55 Q
How many pressure gages must a power boiler have and where?

A

At least one easily readable

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15
Q

35 Q
What is a slow opening valve?

A

One that requires five 360° turns to fully open or fully close

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16
Q

36 Q
Steam boiler gages shall not be less than how many psi?

A

30 psi

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17
Q

56 Q
What size must the connection from the boiler to the water column be?

A

@ least 1”

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18
Q

14 Q
The minimum temperature rating of all valves on a heating boiler shall be at least equal to how many degrees F?

A

250°F

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19
Q

57 Q
What is the drain for on a gage glass?

A

To facilitate cleaning

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20
Q

58 Q
When does power boiler code (section l) apply?

A
  1. For boilers with gas pressure greater than 15 psig (high pressure)
  2. For boilers with high temp water with operating pressure greater than 160 psig and temp greater than 250 degrees F
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21
Q

59 Q
The lower edge of the steam connection to a water column shall be?

A

Not below the highest visible water level in gage glass

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22
Q

60 Q
What is boiler external piping?

A

Piping that begins at the first weld, thread or flange and includes all piping up to and including the second stop valve

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23
Q

61 Q
What is the service limit for non ferrous pipe or tubes (copper or copper alloys)?

A

406°F

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24
Q

62 Q
What is the minimum size of the gage connection to the power boiler?

A

Greater or equal to 1/4 but 1/2” NPS for steal or wrought iron

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25
Q

63 Q
What size is the minimum size of siphon for the pressure gage?

A

1/4” ID

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26
Q

64 Q
How must the pressure gage be graduated on a power boiler?

A

To approx. double the pressure of the safety valve but no less than 1.5 times the pressure

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27
Q

65 Q
How can the fuel cutoff be connected to the boiler?

A

Through tapped openings if nonferrous whys and tees are used

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28
Q

66 Q
What is the boiler proper?

A

Superheaters economizers and other pressure parts connected directly to the boiler without intervening valves.

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29
Q

67 Q
What are the minimum and maximum sizes for blowoff connections?

A

Greater than 100 sq ft heating area 1” to 2½” NPS

less than or equal to 100 sq ft heating area ¾ NPS

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30
Q

68 Q
Which is mandatory to have installed on a separate connection on a hot water heating boiler?

A

Thermometer

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31
Q

69 Q
What section of the code pertains to the construction of power boilers?

A

Section l

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32
Q

70 Q
What does the feedwater piping for all boilers except high temp water include?

A

It extends through the required stop valve and check valve.

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33
Q

71 Q
When should flanged or welded inlet connections be used on a safety relief valve?

A

Over 3” when pressure is greater than 15 PSI

34
Q

72 Q
What section of the code pertains to the construction of heating boilers?

A

Section IV

35
Q

6 Q
When can copper, copper alloys and other nonferrous material be used in dead end and steam or water services?

A

Up to 406° F connecting lines

36
Q

What is the hanger spacing on 4” pipe?
Water —
Gas —

A

Water — 14 feet
Gas — 17 feet

37
Q

12 Q
What is the maximum temperature for copper or brass or nonferrous pipe/tube?

A

406°F

38
Q

25 Q
What cast iron item is not allowed on a high pressure boiler?

A

Nozzles and flanges

39
Q

21 Q
The bottom blowdown line of a high pressure water tube boiler is connected to where on the boiler?

A

Mud drum

40
Q

19 Q
What is the lowest permissible size of the drain on a gages glass on a power boiler?

A

1/4” NPS

41
Q

7 Q
What is a blow down system?

A

Operates continuously to control concentration of dissolved solids

42
Q

26 Q
ASME B31.1 power piping code requires that boiler blow off fittings shall be steel & the thickness of pipe & fittings shall not be less than that of schedule 80 pipe when the boiler pressure exceeds what pressure (psig)?

A

100 psig

43
Q

22 Q
What section of the code pertains to the construction of pressure vessels?

A

Section VIII (8)

44
Q

13 Q
Where can the lowest visible part of the gage glass in a power boiler be located?

A

Fire Tube (power boilers) @ least 3” above the lowest permissible water level or top row of tubes

Cast iron (heating boilers) 1”

Water tube at least 2”

45
Q

8 Q
What is a blowoff system?

A

Operates intermittently to remove accumulation of sediment

46
Q

27 Q
How shall slip on flanges be attached

A

Double fillet weld

47
Q

29 Q
What size boiler does 522 CMR 16 apply to?

A

Units greater than 200,000 BTU but less than or equal to 700,000 BTU

48
Q

15 Q
What is the melting point for braze welding

A

840°F

49
Q

37 Q
Glass gage connections and pipe connections shall not be less than _______ NPS?

A

1/2”

50
Q

38 Q
Why and how is the Hartford loop used?

A

THE return pipe in a gravity return steam boiler is arranged such that the water cannot be forced out below the safe water level

51
Q

40 Q
How many safety valves or safety relief valves are required on a power boiler?

A

At least 1

2 for boilers with greater than 500 sq ft water heating surface

52
Q

41 Q
What size connection must the drain on a power boiler water column be?

A

At least 3/4”

53
Q

41 Q
The upper edge of the water connection to a water column shall be where in relation to the glass gage?

A

Not be above the lowest visible water level in the glass gage

54
Q

43 Q
When are steel valves required?

A

When pressure is greater than 250 psi

55
Q

44 Q
How should discharge piping be arranged?

A

As short and straight as possible with no undue stress on valves

56
Q

46 Q
What must all boilers with a fixed water level have?

A

At least 1 gage glass

57
Q

47 Q
Safety valves/relief are not generated to not let the boiler to rise above what percent.

A

6%

58
Q

20 Q
When are OS & Y valves used?

A
  • All valves greater than or equal to 2½
    NPS at any pressure
  • All valves greater than or equal to 3-
    inch NPS a pressure greater than 600
    psi
  • When boiler steam outlet is over 2” NPS
  • Shut off valves between a boiler and a water column
59
Q

16 Q
When 2 or more boilers are fed from a common source, the piping shall be up to and include?

A

A globe or regulating valve located between the check valves

60
Q

28 Q
After field assembly of a cast iron steam heating boiler, you are required to hydrostatically test it. the assembled boiler shall be subjected to a hydrostatic test of not less than what pressure (psig)?

A

45 (psig)

61
Q

10 Q
How many sources of feed water are required on power boilers?

A

2 sources for all boilers greater than 500 sq ft water heating surface area

62
Q

23 Q
ASME power piping code requires that when the boiler steam outlet is over what size NPS an OS &Y valve shall be used?

A

2 “

63
Q

18 Q
When are 2 or more safety valves required?

A

When the size of the boiler requires a safety relief valve greater than 4 1/2” in diameter

64
Q

9 Q
What are the limits for copper and brass pipe?

A

250 psi
406°F

65
Q

24 Q
The ASME high pressure boiler code limits the use of non ferrous valves.
What is the temperature limitation for a 150 psi class bronze threaded gate
valve?

A

250° F

66
Q

17 Q
What are the limits of nonmetallic pipe?

A

150 psi
& 140° F

67
Q

30 Q
When 2 boiler stop valves are required on a high pressure boiler, what shall be required?

A

A blow drain placed between the stop valves

68
Q

31 Q
All power boiler welding shall be performed in accordance to what code?

A

Section IX (9)

69
Q

32 Q
Discuss the provisions for expansion and contraction of steam mains.

A

Provision anchorage at suitable points so there isn’t undue strain on the boiler

70
Q

33 Q
Does the boiler external piping include the second stop valve and free blow drain?

A

Yes

71
Q

34 Q
Slip on flanges may be used up to what size?

A

4” NPS

72
Q

73 Q
Weld certifications and qualifications are covered under what section of the code

A

Section IX (9)

73
Q

74 Q
What is the location of cylinder markers on high pressure gas cylinders?

A

Shoulder

74
Q

75 Q
Wherever globe valves are used within BEP feedwater piping for either isolation or regulation, the inlet shall be _______?

A

Under the disk of the valve

75
Q

76 Q
The simplist hand bending tool is the _______ bender.

A

Spring

76
Q

77 Q
In the top and bottom of the acetelyne cylinder are safety plugs designed to melt at _______°F

A

220°F

77
Q

78 Q
They type of copper tubing that has the thinnest type of wall is type ______

A

M

78
Q

79 Q
Category ________ is the less hazardous service. It includes fluids that are nontoxic, nonflammable and not dangerous to human tissue and are at a pressuer less than 150psi and temperature from -20 degrees F through
186 degrees F.

A

D fluid service

79
Q

81 Q
The flame temperature of propylene in oxygen is _________

A

5250°F

80
Q

82 Q
The standard oxygen cylinder contains ________

A

2200 psi

81
Q

80 Q
The moving part of a valve that directly affects the flow through the valve is
known as the ________.

A

Disc

82
Q

39 Q
When installing a low water cut-off on a hot water heating boiler you many install it where?

A

Any place above the lowest safe permissible water level and before the first stop valve

Pipefitter License (10 decks)

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