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Accessories, Piping, Refrigerant & Oils > Piping Ppt > Flashcards

Piping Ppt Flashcards

1
Q

Types of refrigeration and air conditioning tubing:

K - ______duty ( _____ wall)

L - ______ wall thickness

M - ______ duty (____ wall)

Type __ is most common in this trade

A

K - heavy duty (thicker wall)

L - Regular wall thickness

M - Light duty (thin wall)

Type L is most common

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2
Q

Goal of good refrigeration piping:

  1. Provide for economical refrigerant line sizing without excessive ________ drops
  2. Ensure adequate refrigerant _____ to _________
  3. Prevent unplanned _______ of oil in system piping
  4. Prevent the compressor from ______ of liquid refrigerant or oil
A
  1. excessive pressure drops
  2. flow to evaporator
  3. trapping of oil
  4. slugging
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3
Q

Guide lines to insure the above:

  1. Keep lay out ______
  2. Keep number of joints to a ________
  3. Keep lines as _____ as possible
  4. Avoid unnecessary _____
  5. Use _____ down system whenever possible
  6. Properly support _______
  7. Install proper _______ elimination devices when required
A
  1. simple
  2. minimum
  3. small
  4. traps
  5. pump down
  6. piping
  7. vibration
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4
Q

Refrigerant piping priorities:

  1. Most sensitive is the _______ line
  2. Less sensitive are the Condensate line, ___ gas line, and _____ line
A
  1. suction line
  2. condensate line, hot gas line, and liquid line
    note: generally in that order
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5
Q

Pressure Drop in piping is controlled by the following: (4)

  1. pipe _______
  2. pipe ______
  3. number of _________
  4. fluid ________
A
  1. Pipe Diameter
  2. Pipe length
  3. number of fittings
  4. fluid velocity
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6
Q

Suction line design and installation:

Common goal limit suction line to __F equivalent pressure drop

A

2F

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7
Q

Suction line design and installation:

  1. Return ___ back to the compressor under all load conditions
  2. Prevent oil from draining from active and inactive _________
  3. Prevent liquid refrigerant from draining back to the _________ during the off cycle
  4. Prevent unnecessary _____ gains and the line sweating
A
  1. oil
  2. evaporator
  3. compressor
  4. heat gains
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8
Q

Suction line design and installation:

  1. Ensure minimum gas velocity ___fpm from horizontal runs
  2. Ensure minimum gas velocity of ____fpm from vertical risers (travelling up)
  3. Ensure max velocity of ____fpm is not exceeded
  4. Ensure trap is installed at the base of all suction line risers over __ft (good up to 25ft of rise)
A
  1. 500fpm
  2. 1000fpm
  3. 4000fpm
  4. 8ft
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9
Q

Suction line design and installation:

  1. Use double suction risers if system can reduce capacity down to ___% of full load
  2. Insure high compression ratios are _______
  3. Pitch horizontal runs 1/2” down every ___ft in direction of flow
  4. Use _____ at the top of coil when pump down control is not used
A
  1. 50%
  2. avoided
  3. 10ft
  4. loops
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10
Q

Suction line design and installation:

Ensure ___” of suction line within the conditioned space before exiting

A

18”

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11
Q

Hot gas line design and installation:

Common goals limit hot gas line to __F equivalent pressure drop

A

2F

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12
Q

Hot gas line design and installation: Goals:

  1. Ensure oil leaving the compressor travels to the _________
  2. Avoid _________
  3. Use proper ________ devices
  4. Prevent refrigerant migrating back to the compressor during ____ cycles
A
  1. condenser
  2. trapping
  3. vibration
  4. off cycles
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13
Q

Hot gas line design and installation:

  1. Ensure minimum gas velocity of ____fpm for horizontal runs
  2. Ensure minimum gas velocity of ______ fpm for verticals risers
  3. Trap at base of all hot gas risers over 8ft (good up to ___ft)
A
  1. 500
  2. 1000
  3. 25ft
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14
Q

If vertical velocity is less than 1000fpm then a double ______ should be installed

A

riser

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15
Q

Hot gas design and installation:

  1. Use double hot gas risers if system capacity drops to ___% of full load
  2. Ensure a max gas velocity of _____fpm is not exceeded
  3. pitch all horizontal runs 1/2” every 10ft in direction of _____
A
  1. 50%
  2. 4000fpm
  3. flow
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16
Q

Hot gas line design and installation:

  1. Ensure compression ratios are kept to a ________
  2. Avoid ____ heading of the common discharge when using multiple compressors as it causes excessive noise, vibration, excessive pressure drops
A
  1. minimum

2. bull

17
Q

Liquid line design and installation:

Common goal limit liquid line to __F equivalent pressure drop

A

2F

18
Q

Liquid line design and installation:

  1. Ensure flash gas is not created because of excessive ______ drops
  2. Flash gas can cause reduced _______, noisy _______ device, unstable metering device operation
A
  1. pressure

2. capacity, metering

19
Q

Liquid Line design and installation:

  1. Run lines as _____ as possible
  2. No _____ required on vertical risers
  3. Ensure pressure drop of 2F is not ________
  4. Max liquid velocity ____fpm avoiding liquid hammering
A
  1. direct
  2. traps
  3. exceeded
  4. 360fpm
20
Q

Oil equalization multi-compressor installations:

Methods:
1. Oil separator with oil reservoir and float ______

  1. Oil equalization (one line _____, one line ______)
A
  1. switch

2. above, below

21
Q

Refrigeration Pipe Support:

  1. All piping should be supported with hangers that can withstand the weight of; pipe, pipe fittings, valves, fluid in the pipe, installation
  2. Support spacing for copper tubing includes the weight of the tubing filled with _______
A

1.

2. water

22
Q

Installation of Heat Exchangers and the use of Pipe Insulation: Types;

  1. (closed cell foam) _______
  2. (foam tape) _____ wrap
  3. (compressed fibers with canvas wrap) ________
A
  1. Armaflex
  2. Pipe Wrap
  3. Fibreglass
23
Q

Oil Trap:

  1. To construct an oil trap that has a min horizontal dimension, use two street 90 degrees and a regular ell
  2. This trap can be used at the outlet of an evaporator to remove any liquid refrigerant from the area of the ____ sensing bulb
A

1.

2. TXV

24
Q

Risers that have an eight foot vertical rise or less do not need to have an ___ ____ at the bottom of the riser

A

oil trap

25
Q
  1. If the rise of the discharge or suction riser is greater than eight feet then a ____ should be installed at the bottom of the rise
  2. The reason for this is so that oil will not accumulate at the heads of the compressor during the ____cycle
A
  1. trap

2. off

26
Q

Evaporator Condensate Drain Line:

  1. This line is normally 3/4” but may be other sizes due to different ___________
  2. This line is trapped to ______ un-conditioned air from infiltrating the space
  3. Good piping practice dictates the trap is normally installed _______ the controlled space
A
  1. manufacturers
  2. prevent
  3. outside
27
Q

Purpose of a pump down system is to ______ refrigeration from migrating back into the compressor during the off cycle

A

liquid

Accessories, Piping, Refrigerant & Oils (9 decks)

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