Chapter 8 Water Supply Operations

Question 1

How much water is carried on a SFD engine company?

Answer 1

500 Gallons

Question 2

How long can you work off of tank water for an 1 3/4”?

Answer 2

Almost 3 minutes

Question 3

What are the 3 water supply evolutions?

Answer 3

Lay in, Lay out and Split

Question 4

NFPA requires what types of threads on hydrants?

Answer 4

National Standard Thread NST

Question 5

What are the 3 basic components of a hydrant?

Answer 5

Barrel, stem, outlets

Question 6

What is a corey top?

Answer 6

a 2-2.5” outlet on top of the barrel for the utilities department

Question 7

What is a clow hydrant?

Answer 7

All outlets are arranged horizontally, found in commercial and industrial occupancies

Question 8

What are the basic flows from a hydrant that an engine company can count on?

Answer 8

1. A single 5” line may not flow all available water
2. 2.5” outlet will deliver 80% of a 4.5” outlet
3. 4.5” discharge will deliver 2100 GPM at 15PSI

Question 9

What are the color/flow rates for the SFD hydrants?

Answer 9

Red - less than 500
Yellow - 500-999
Green 1,000 or more GPM

Question 10

What is a forward lay?

Answer 10

Hydrant to the fire

Question 11

Describe wet vs. dry lead

Answer 11

Wet - the Back up will remain at the plug to charge the plug

Dry - the Back up returns to the engine

Question 12

Describe a reverse lay.

Answer 12

Fire building to the hydrant