IFSTA 7 Theoretical Pressure Calculations

Question 1

friction loss and elevation pressure loss/gain & appliance loss are referred to as what
210 3rd

Answer 1

Total pressure loss

Question 2

what two methods are used to determine friction loss

Second edition page 185

Answer 2

Field tests and calculations

Question 3

when determining your own friction loss coefficients in order to get the results indicative of averages that can be expected on the fireground it is necessary to test what

Second edition page 187

Answer 3

The same hose that will be used on the fire ground

Question 4

how many types of hoses should be tested when determining friction loss coefficients

Second edition page 187

Answer 4

Only one type of hose at a time

Question 5

if testing 50 foot hose lengths, How many feet total should be laid out

 Second edition page 187

Answer 5

300 feet

Question 6

if using a Pitot tube to determine the nozzle pressure and corresponding flow of water what type of nozzle should be used

273 3rd

Answer 6

Smoothbore

Question 7

if using a flow meter to determine the nozzle pressure and corresponding flow of water what type of nozzle should be what?
273 3rd

Answer 7

Any nozzle

Question 8

When testing hose, place gauge one in the hose line at the connection between the first and second sections of hose. away from the discharge insert the second gauge at what point

273 3rd

Answer 8

200 feet from 1st gauge

Question 9

how many test runs should be conducted for each size hose

274 3rd

Answer 9

3-4

Question 10

elevation pressure is created by elevation difference between what

Second edition page 190

Answer 10

Nozzle in the pump

Question 11

what is the equation for determining elevation pressure in a multi story building

Second edition page 191

Answer 11

5 psi X (# of stories - 1)

Question 12

when determining the friction loss for equal length - multiple lines, whose diameters are the same, it is necessary to perform calculations for what

Second edition page 195

Answer 12

Only one line

Question 13

net pump discharge pressure is the difference between what

Second edition page 213

Answer 13

The pump discharge pressure and the incoming pressure from the hydrant

Question 14

what is the equation for determining net pump discharge pressure

219 3rd

Answer 14

PDP — intake reading

Question 15

during friction loss testing in-line gauges are preferably calibrated in increments of how many psi or less

Third edition page 213

Answer 15

5 psi

Question 16

when testing hose lines of equal length that are Siamese to supply a fire stream, friction loss is approximately how much less than that of a single hose line at the same nozzle pressure

Third edition page 216

Answer 16

25%

Question 17

What is the coefficient for 2 - 2 1/2 inch hoses Siamese?

229 3rd

Answer 17

.5

Question 18

what is the coefficient for two 3” hoses with 2 1/2 inch couplings Siamese
229 3rd

Answer 18

.2

Question 19

if a portable flow meter is being used during hose testing where should it NOT be inserted?
273 3rd

Answer 19

In between test gauges

Question 20

What is the coefficient for

(1) 3 inch with 2 1/2 inch couplings
(1) 2 1/2 inch

229 3rd

Answer 20

.3