EOG 300 pg 27-29 Water Supply

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Questions and Answers

What is the purpose of hooking short (50') sections of 3in to the hydrant during reverse lay pump hook-ups?

To ensure maximum flow from the engine.

To enhance the durability of the hoses.

To minimize the friction loss of using 3in hose (correct)

To increase water pressure from the hydrant.

Which connection is made to the 2 1/2" outlet on the hydrant during the hook-up?

A short 50' section to the engine. (correct)

An adapter for larger hoses.

A 3" hose to maintain pressure.

A 5" hose to increase flow.

Which of the following best describes why 3" hose is avoided on a forward lay

It does not conform to safety regulations.

It is incompatible with the hydrant fittings.

It has a higher friction loss affecting flow. (correct)

It is harder to manage than larger hoses.

What type of adapter is used in this pump hook-up process?

A 2 1/2" to 5" adapter. Signup and view all the answers

During the hook-up process, where should one hook up be connected?

To the 2 1/2" intake closest to the hydrant. Signup and view all the answers

What is the primary effect of using a 2½" solid-bore tip at 80 psi nozzle pressure?

It delivers a flow of 1000 gpm. Signup and view all the answers

What is the effect of attaching a 2½"-5" Storz adapter to a hydrant?

It allows flow through the single 2½" port. Signup and view all the answers

What is a key reason older apparatus might use a 2½" discharge to pump a 5" hose?

They lack large diameter discharges Signup and view all the answers

At what pressure does a 2½" solid-bore tip deliver 1000gpm?

80 psi Signup and view all the answers

What issue was identified with the light blue 4 ½" - 4" adapter?

The thread spacing was right, but the thread pitch was wrong. Signup and view all the answers

Which adapter is confirmed to work correctly?

Bronze 4 ½" - 4" adapter Signup and view all the answers

What action should be taken regarding the light blue adapters?

They should be turned in to Physical Resources. Signup and view all the answers

What is the correct designation for the thread type of the adapters?

Tulsa Thread Signup and view all the answers

Why were some TFD apparatus equipped with bronze adapters initially?

They were manufactured correctly before the blue adapters were introduced. Signup and view all the answers

What is the primary consideration when a fire requires master streams?

Employing a reverse lay and pump hook-up Signup and view all the answers

Which water supply method is preferred when the fire flow exceeds the capacity of two preconnects?

Implementing a forward lay with 5" hose Signup and view all the answers

What issue can arise with hydrants in the city limits regarding steamer connections?

Steamer caps may be stuck and unopenable Signup and view all the answers

What is a major disadvantage of using 5" hose without a reverse lay when a strong water flow is needed?

High friction loss at greater distances Signup and view all the answers

Which of the following is NOT a condition that may necessitate a reverse lay?

Strong hydrants available nearby Signup and view all the answers

Why might mutual aid area hydrants present a challenge when connecting hoses?

They use incompatible thread types Signup and view all the answers

What is the friction loss in 5" hose at a flow rate of 1000 gpm?

Five to six psi per 100 ft Signup and view all the answers

What is the implication of exceeding the distance of 300 feet to a hydrant when utilizing 3" supply lines?

3" lines should not be used beyond this point Signup and view all the answers

Study Notes

Water Supply Considerations

Establish both primary and secondary water supplies for effective fire response.
Friction loss for 5" hose at 1000 gpm is five to six psi per 100 ft, which does not guarantee a sufficient water supply on its own.
Forward lays of 5" hose are suitable for most one and two-family homes, apartments, and small commercial fires.
When master streams are anticipated, consider utilizing a reverse lay and pump hook-up for enhanced capability.
A single 5” line configured with a reverse lay can supply multiple master streams and handlines.
Reverse lay and pump hook-up is advisable when encountering:
- Weak hydrants or inadequate water supply
- Situations requiring relay pumping
For anticipated fire flow exceeding the capacity of two preconnects or when hydrant distance surpasses 300 feet, avoid using 3" supply line.

Mutual Aid Water Supply

Tulsa hydrants are outfitted with a 4" Tulsa Thread on the steamer outlet, while mutual aid areas utilize a 4 1/2" National Standard Thread (NST).
Compatibility issues arise with steamer outlets but 2 1/2" NST outlets can be used with hydrant-to-Storz adapters.
Instances of hydrants with non-compatible steamer outlets may require alternate water supply methods, such as forward lay with 5" hose or reverse lay and pump hook-up.

Strategic Hook-Up Techniques

Forward Lay:
- Attach a 2½"-5" Storz adapter to one of the 2½" hydrant outlets.
- Operate a 5" supply line from the single 2 1/2" port to maintain flow to the scene.
Solid-Bore Tip: Using a 2½" solid-bore tip can deliver 1000 gpm at 80 psi nozzle pressure, with minimal high friction loss due to the smaller outlet.

Hook-Up Steps

Carry out the reverse lay procedure as standard.
For pump hook-up:
- Connect two short (50') lines to the hydrant's 2 1/2" outlets.
- Attach one line to the nearest engine intake and the second line to the 5" master intake using a 2 1/2" to 5" adapter to reduce 3" hose usage and friction loss.

Light Blue Mutual Aid Removal

Light blue 4 ½” NST – 4" Tulsa Thread adapters were improperly manufactured and do not work correctly with the steamer thread.
Some Tulsa Fire Department (TFD) apparatus may have bronze adapters that fit correctly; these should be retained while light blue adapters must be returned to Physical Resources.

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Description

Test your knowledge on the emergency operating guidelines related to water supply in fire department operations. This quiz covers strategic and tactical considerations, including hose specifications and their impact on water supply effectiveness. Ensure you're equipped with the right knowledge for effective firefighting.