Flashcards in General Knowledge Deck (16):

1

## At what pressure do you pump a master stream with a fog nozzle?

### You always pump at 100 psi

2

## At what pressure do you pump a master stream with a smooth bore nozzle?

### You generally pump at 80 psi. If the master stream is fixed (the stang) you can increase the pressure to 100 psi.

3

## What is the FL for a master stream appliance?

### 25 psi

4

## At what pressure do you pump a hand line with a smooth bore nozzle?

### 50 psi

5

##
At what pressure is the intake pressure relief valve set?

Who sets this pressure?

###

Barry at the shop sets the pressure.

6

## When pumping into a sprinkler system, your starting pressure (according to Richmond policy) is....

### 125 psi. This may increase depending on the interior conditions.

7

##
Smooth Bore handlines- 50 psi

1" GPM?

1 1/8" GPM?

1 1/4" GPM?

###
1" 200 GPM

1 1/8" 250 GPM

1 1/4" 300 GPM

Tips over 1 1/4" are not considered practical or safe to be used on smooth bore handlines.

8

##
Volume Measurements

Convert cubic inches to gallons

Convert cubic feet to gallons

###
Gallons = cubic inches / 231

Gallons = cubic feet x 7.481

9

## Name the Six Principles of Pressures in Fluids

###
1. Fluid pressure is perpendicular to any surface on which it acts

2. Fluid pressure at a point in a fluid at rest is of the same intensity in all directions.

3. Pressure applied to a confined fluid from without is transmitted in all directions without diminution.

4. The downward pressure of a liquid in an open vessel is proportional to its depth.

5. The downward pressure of a liquid in an open vessel is proportional to the liquid density.

6. The downward pressure of a liquid on the bottom of a vessel is independent of the shape of the vessel itself.

10

## How much does a cubic foot of water weigh?

### 62.5 pounds

11

##
Each inch of Mercury on the negative side of the compound gauge is equivalent to.....

________ psi

________ feet of water

###
0.49 psi

1.13 feet of water

20" of Mercury= 1.13 x 20

=water will rise 22.6 feet toward pump ( not including FL)

12

##
Pump Rated Capacity

_____% of rated capacity at 150 psi

_____% of rated capacity at 200 psi

_____% of rated capacity at 250 psi

###
100% at 150 psi

70% at 200 psi

50% at 250 psi

13

## A common method of measuring atmospheric pressure is comparing it with the weight of Mercury. A pressure of 1 psi makes the column of Mercury how tall? What is atmospheric pressure at sea level?

###
1 psi makes the Mercury 2.04 inches tall. Atmospheric pressure at sea level is 14.7 or 29.9 inches of Mercury.

14

## Any pressure less than atmospheric pressure is called...

### Vacuum

15

## Head is the height of a water supply above the discharge orifice. Convert 100 feet of head to head pressure.

###
100 feet / 2.304 = 43.4 psi

2.304 is the number of feet that 1 psi will raise a 1 sq inch column of water

16