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HVAC Systems_SP25 > [L5]_Pipe Sizing & Design > Flashcards

[L5]_Pipe Sizing & Design Flashcards

1
Q

IND405

What are the two (2) common types of copper pipe used for above and below ground potable water systems?

[L5]

A
  1. Type ‘L’ copper piping
  2. Type ‘K’ copper piping

[L5]

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2
Q

IND405

What is the simplest route to calculate a piping system maximum pressure loss?

[L5]

A

Pressure loss is based on the longest & highest pressure loss fluid route.

[L5]

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3
Q

IND405

What is the roughness factor difference between a New Steel Pipe and a Badly Corroded Pipe?

[L5]

A

140C down to 100C roughness factor

[L5]

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4
Q

IND405

What equation is expressed shown below?

[L5]

A

Bernoulli’s Equation

[L5]

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5
Q

IND405

What is the long form formula for Total Dynamic Head (TDH)?

[L5]

A

[L5]

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6
Q

IND405

What is the short form formula for Total Dynamic Head (TDH)?

[L5]

A

TDH = h(discharge) - h(suction)

[L5]

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7
Q

IND405

What is the conversion from equivalent feet to psia?

[L5]

A

Head Pressure (psia) = [Pressure (FT) * 0.433]

[L5]

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8
Q

IND405

What is the expressed formula for a piping system total pressure drop?

[L5]

A

PD(total) = PD(pipe)+PD(vf)+PD(equip)+NPSH/Vertical Height

[L5]

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9
Q

IND405

What are the three (3) piping pressure drop calculation methods?

[L5]

A
  1. Rough Estimation Method
  2. Equivalent Length Method
  3. K-Value Method

[L5]

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10
Q

IND405

What is the formula for K-Value method for a piping system?

[L5]

A

PD(vf) = k * [V2/ (2*g)]

[L5]

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11
Q

IND405

If a 6-inch standard 90-degree elbow would produce a pressure loss value that
would be equivalent to 16-feet of 3-inch piping?

[L5]

A

Standard Tee through Side Outlet

[L5]

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12
Q

IND405

What would be the fitting equivalent piping pressure loss for a ½-Closed Gate Valve which is installed on a 3-inch diameter pipe?

[L5]

A

48-feet equivalent piping loss

[L5]

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13
Q

IND405

What are the top eight (8) most important pipe types?

[L5]

A
  1. PVC
  2. CPVC
  3. Galvanized
  4. Cooper
  5. Stainless Steel
  6. Concrete
  7. PEX
  8. HDPE

[L5]

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14
Q

IND405

What is the maximum allowed temperature for PVC piping systems?

[L5]

A

A maximum internal temperature of 140-degrees (F)

[L5]

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15
Q

IND405

What is the maximum allowed temperature for CPVC piping systems?

[L5]

A

A maximum internal temperature of 200-degrees (F)

[L5]

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16
Q

IND405

What molten material are galvanized pipes dipped in to become rust resistant?

[L5]

A

Molten Zinc which is melted at 850-degrees (F)

[L5]

17
Q

IND405

Which piping material type has the best tensile strength & heat transfer capabilities?

[L5]

A

Cooper

[L5]

18
Q

IND405

Which piping material type is rated to be used in food grade applications only?

[L5]

A

Stainless Steel

[L5]

19
Q

IND405

What are the two (2) types of Stainless Steel used for SS tubing in fluid transfer applications?

[L5]

A

SS304 & SS316

[L5]

20
Q

IND405

Which piping material type is best for citywide storm water drainage applications?

[L5]

A

Concrete Piping

[L5]

21
Q

IND405

Which piping material type is best for winterizing & deicing roads/driveways/sidewalks applications?

[L5]

A

Minimum 1/2”-diameter PEX piping

[L5]

22
Q

IND405

Which piping material type is best for geothermal well heating & cooling applications?

[L5]

A

HDPE Piping

[L5]

23
Q

IND405

What type of piping does Cross-Linked Polyethylene stand for?

[L5]

A

PEX Piping

[L5]

24
Q

IND405

What is the correct name of the iron core in a hydraulic solenoid?

[L5]

A

The Armature

[L5]

25
Q

IND405

What are the three (3) parameters needed for sizing a pipe?

[L5]

A
  1. Type of Space
  2. Total Flow Rate
  3. Total Pressure Drop

[L5]

26
Q

IND405

What is the formula for velocity of a fluid through a pipe?

[L5]

A

V = Q/A

[L5]

27
Q

IND405

What percentage of the world’s electrical demand is consumed by pumping operation?

[L5]

A

20%

[L5]

28
Q

IND405

Define Priming.

[L5]

A

Priming refers to the procedure of displacing air within the intake lines and certain sections of the pump with water.

[L5]

29
Q

IND405

Define BEP.

[L5]

A

The point along a pump performance curve that exhibits the maximum level of efficiency is referred to as the best efficiency point (BEP). To put it another way, the BEP is the point where the pump efficiency is at its highest.

[L5]

30
Q

IND405

What is the optimal BEP % for an operating pump to achieve the longest life span?

[L5]

A

Approximately 80%

[L5]

HVAC Systems_SP25 (12 decks)

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