04 Drafting

Question 1

What are considered to be the only resources providing water in rural areas?

Answer 1

1. Portable Water Source
2. Natural Water Source

Question 2

Natural Resources include:

Answer 2

1. Lakes
2. Ponds
3. Streams
4. Irrigation Ditches

Question 3

Portable resources include:

Answer 3

1. Water tankers
2. Portable tanks

Question 4

Best locations for drafting

Answer 4

Boat Ramps
Roads Close enough to water
Bridges

Question 5

Atmospheric pressure at sea level

Answer 5

14.7 psi

Question 6

Loss of atmospheric pressure per 1000 ft rise:

Answer 6

1/2 pound of pressure

Question 7

Priming pump

Answer 7

Positive Displacement pump that can pump both water and air
Creates a vacuum within centrifugal pump

Question 8

How much space is needed for a strainer?

Answer 8

18 inches above and below
Too close to surface, air gets in and ruins prime
Too close to bottom, debris gets in and ruins suction

Question 9

Lift

Answer 9

Vertical distance from the surface of the water to the center of the pump

Question 10

Theoretical Maximum Lift

Answer 10

33.9ft

Question 11

Realistic Maximum Lift

Answer 11

23ft

Question 12

Marks below zero on intake gauge measure

Answer 12

inches of mercury

Question 13

For every inch of mercury reduction, the water will rise

Answer 13

1.13 ft

Question 14

Rule of Thumb: For every inch of mercury, water will rise

Answer 14

1 ft
Try not to lift more than 10ft

Question 15

A loss of atmospheric pressure means that there is less pressure pushing the water into the pump. If less pressure pushing, the height that water can be lifted will be

Answer 15

reduced.

Question 16

Modern engines are rated at

Answer 16

1250gpm or greater

Question 17

Rated capacity of pump is determined when the pump is discharging _________ while drafting.

Answer 17

150psi (This is the pressure the pump is most effective)

Question 18

Net Pump Pressure

Answer 18

Total amount of work being done by the pump.
When working with a hydrant, it is the discharge pressure minus the incoming hydrant pressure

Question 19

It is IDEAL to place the strainer at least ______ below the surface of the water and at least ______ above the bottom at all times.

Answer 19

2 ft / 1 ft

Question 20

Water should be delivered to the pump within about ______.

Answer 20

30 sec.

Question 21

If water doesn’t arrive in stated time, what should be done?

Answer 21

Priming pump turned off and problem investigated.

Question 22

Priming pump should not be activated for more than ________ at a time with a _______ rest in between.

Answer 22

1 min / 1 min

Question 23

Usual problems

Answer 23

1. Too high a lift
2. Clogged Strainer
3. Air Leaks
4. Lack of lubrication on priming pump

Question 24

If throttle increases without discharge pressure increasing:

Answer 24

1. The pump operator is trying to pump past the capacity of the pump
2. The pump has not been fully primed.