Pipe 101

Question 1

<p>The volt is a measure off \_\_\_\_\_?</p>

Answer 1

<p>Electrical pressure</p>

Question 2

<p>In electrical circuits, the time of doing work is expressed in:</p>

Answer 2

<p>Amperes</p>

Question 3

<p>The device used in circuits to prevent damage from overloads is called a \_\_\_\_\_?</p>

Answer 3

<p>Fuse.</p>

Question 4

<p>The advantage of solder less connectors over soldered type connectors is that they are

a) Mechanically strong
b) Easier to install
c) Free of corrosion
d) All of the above</p>

Answer 4

<p>d)All of the above</p>

Question 5

<p>Voltage is measured with a \_\_\_\_\_?</p>

Answer 5

<p>Voltmeter</p>

Question 6

<p>Current is measured with a \_\_\_\_\_?</p>

Answer 6

<p>Ammeter</p>

Question 7

<p>How does physical change differ from chemical change?</p>

Answer 7

<p>Physical change does not affect the chemical composition of a substance</p>

Question 8

<p>A substance that has a definite volume but no definite shape is called \_\_\_\_\_?</p>

Answer 8

<p>Liquid</p>

Question 9

<p>If the density D and the weight W of an object is known, write the formula that may be used to determine the volume of an object.</p>

Answer 9

<p>V=W

| D</p>

Question 10

<p>T/F

| The pressure on the bottom of a tank of fluid varies directly with density of the liquid in the tank</p>

Answer 10

<p>True</p>

Question 11

<p>The pressure at a certain depth below the surface of a liquid is \_\_\_\_\_?</p>

Answer 11

<p>Head pressure</p>

Question 12

<p>T/F

| Pressure = HxD</p>

Answer 12

<p>True</p>

Question 13

<p>Water pressure is usually measured by means of a \_\_\_\_\_ gauge.</p>

Answer 13

<p>Bourdon tube</p>

Question 14

<p>A boiler is located in the penthouse of a building 300' above the basement. If the city water pressure supply is 45 psig in the basement, how much additional pressure must be furnished by the pump used to fill the boiler?</p>

Answer 14

<p>300' x .433=129.9 psig
-45 psig
= 84.9 furnished by the pump</p>

Question 15

<p>As fluid flows through a piping system there is a loss of pressure due to friction. List four factors which will affect this pressure loss.</p>

Answer 15

<p>1. Viscosity of fluid

2. Length of pipe
3. Velocity of flow
4. Size and type of pipe
5. Number and type of fittings and valves
6. Number and degree of bends</p>

Question 16

<p>With quantity of flow in GPM constant, the velocity of flow will \_\_\_\_\_ with a decrease in the pipe size.</p>

Answer 16

<p>Increase</p>

Question 17

<p>Standard atmospheric pressure equals \_\_\_\_\_psi or \_\_\_\_\_in/hg</p>

Answer 17

<p>14.7 psi or 29.92 in/hg</p>

Question 18

<p>As pressure on gas increases (temperature remaining constant) the volume of the gas will \_\_\_\_\_.</p>

Answer 18

<p>Decrease</p>

Question 19

<p>Absolute zero is calculated to be \_\_\_\_\_ degrees Fahrenheit.</p>

Answer 19

<p>-460*F</p>

Question 20

<p>If pressure on water which is being warmed is increased, the rate of the evaporation of the water is \_\_\_\_\_?</p>

Answer 20

<p>Decreased</p>

Question 21

<p>List three ways the human body loses heat.</p>

Answer 21

<p>1)Radiation

2) Convection
3) Evaporation</p>

Question 22

<p>With few exceptions solids expand when \_\_\_\_\_ and \_\_\_\_\_ when cooled.</p>

Answer 22

<p>HOT and CONTRACT</p>

Question 23

<p>How many BTUs are required to change 20 gal. of 212*F water to 212*F steam?</p>

Answer 23

<p>20 gal x 8.33 lbs = 166.6 lbs

| 166.6 lbs x 970.4 btu/lb = 161,668.64 btu's</p>

Question 24

<p>Change 42*Celsius to degrees Fahrenheit</p>

Answer 24

<p>42*C x 9/5 + 32 = 107.6*F</p>

Question 25

Where should the condensate pump be located?

Answer 25

At the lowest point of the return as close to the boiler as possible.

Question 26

Explain the pitch required for Steam Supply: _____ Return: _____

Answer 26

Supply: Down 1" per 20' | Return: Down 1/2" per 20'

Question 27

Explain the difference between an Air vent and an Air vent vacuum valve.

Answer 27

Air Vent: Vent valve only vents air from the system Air vent vacuum valve: Releases air and prevents the vacuum in the coil from exceeding that of the condensate return preventing pressure reversal.

Question 28

T/F | Steam main should be pitched up in the direction of flow.

Answer 28

False Main should be pitched down away from boiler to allow condensate to be collected in the end to main drip and prevent going back to boiler through Steam supply main.

Question 29

T/F | Steam main returns should be pitched up in the direction of flow,

Answer 29

False | Return mains should be pitched down to return condensate to condensate receiver

Question 30

Reducing the pipe size in a horizontal steam main requires the use of a/an ______ reducer

Answer 30

Eccentric

Question 31

Why does an angle valve trap make the convector easier to install?

Answer 31

It allows more working space for making connections and less care is required to line up the piping.

Question 32

List the functions of steam traps and briefly describe the importance of these functions to operations of the steam piping system.

Answer 32

1) They prevent the loss of steam by creating a pressure differential between steam main and condensate return aiding the steam getting to its point of use. 2) They allow passage of condensate to prevent the system and coils from becoming water logged. 3) They eliminate air and non-condensable gases from the steam main. This prevents the air from affecting heat transfer and the incondensable gases from forming harmful compounds such as carbonic acid

Question 33

Steam waterlogging is_____?

Answer 33

Condensate filling the steam space

Question 34

Mechanical steam traps operate on the _____ between the steam and condensate.

Answer 34

Difference in density

Question 35

What causes the bucket of an inverted bucket trap to rise, closing the valve at the top of the trap?

Answer 35

Steam entering the bucket causes the bucket to rise.

Question 36

The purpose of a feeder cutoff combination controller on a closed heating system is to maintain a _____ level in the boiler, and not to keep the boiler filled to its _____ operating level.

Answer 36

SAFE OPERATING LEVEL | NORMAL

Question 37

T/F | A steam pop safety valve is adequate protection on a low pressure heating boiler to prevent damage

Answer 37

False

Question 38

The lowest safe water line in a boiler should not be lower than the _____ of the gauge glass.

Answer 38

Lowest visible point