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Plumbing > Union Math Short Cut. > Flashcards

Union Math Short Cut. Flashcards

0
Q
  1. How shall you convert feet and inches into decimal feet?
A

Change inches into decimal, then divide by 12.

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1
Q
  1. How shall you convert fraction to a decimal?
A

Divide denominator into numerator.

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2
Q
  1. How shall you convert decimal feet into feet and inches?
A

Multiply by 12 - then multiply reminder by 8 to d get to the nearest 1/8”.

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3
Q
  1. What is multiply?
A

It is over divide.

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4
Q
  1. Formulas for 45* offset?
A
  1. Travel = offset or advance x 1.414.
  2. Offset or advance = travel x .707,
  3. Offset or advance = travel / 1.414.
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5
Q
  1. Formula for rise?
A

Rise = spread x .414

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6
Q
  1. Diagram for grade/slope/pitch?
A

TF
———- divide
G. |. D
multiply.

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7
Q
  1. Formulas for grade/slope/pitch?
A
  1. Total fall = grade x distance (answer in inches).
  2. Grade = total fall / distance (answer in parts of an inch).
  3. Distance = total fall / grade (answer in decimal feet change to feet and inches).
  4. Total fall = %grade x distance (answer in decimal feet change to feet and inches).
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8
Q
  1. Formula for perimeter of a rectangle/squar?
A

P = 2 lengths + 2 widths.

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9
Q
  1. Formula for area of a rectangle/square?
A

A = length x width.

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10
Q
  1. Formula for circumference of a circle outside diameter of a pipe?
A

C = 3.1416 x diameter.

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11
Q
  1. Formulas for area of a circle, inside diameter of a pipe, cross-sectional area. of a pipe?
A

A = 3.1416 x radius^2.
A = .7854 x diameter^2.
Answer will be in square inches or square feet.

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12
Q
  1. Formula for area/volume/capacity of a rectangle/square?
A

V = length x width x height.

Answer will be in cubic inches or cubic feet.

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13
Q
  1. Formula for volume of a cylinder/tank?
A

V = 3.1416 x radius^2 x height.
V = .7854 x diameter^2 x height.
Answer will be in cubic inches or cubic feet.

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14
Q
  1. How much does 1 gallon of water weights?
A

8.34 lbs.

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15
Q
  1. How many gallons has 1 cubic foot of water?
A

7.48.

16
Q
  1. How many cubic inches has 1 cubic foot?
A

1728.

17
Q
  1. How many cubic inches has 1 gallon?
A

231.

18
Q
  1. How many pounds has 1 cubic inch of water?
A

0.0361 lbs.

19
Q
  1. How much does 1 cubic foot of water weight?
A

62.4 lbs.

20
Q
  1. How many lbs/sq.inch does 1 foot high column of water exert?
A

.434 psi.

21
Q
  1. How will 1 psi raise water?
A

2.31 feet or 27 3/4”.

22
Q
  1. What is atmospheric pressure?
A
  1. 7 psi.
  2. 9’.
  3. 7 head pressure.
23
Q
  1. Constant %?
A

100ths = .00

24
Q
  1. What is usually PPF?
A

1/8” or 1/4” per foot pitch.

25
Q
  1. What is AFF?
A

Above finish floor.

26
Q
  1. What is invert?
A

Inside bottom of pipe or trench.

27
Q
  1. What is usually % of grade?
A

1% or 2%.

28
Q
  1. Formulas for % rate?
A

Portion = base x % rate.
% rate = portion / base.
Base = portion / % rate.

Plumbing (23 decks)

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