Ch4 pg 61-67

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Questions and Answers

What factors should be considered when determining the proper hoseline choices for a response area?

Type of fire and available equipment

Occupancy, construction, height and area as well as location (correct)

Response time and crew experience

Water supply and number of hydrants

What is the ideal situation of outfitting a pumper?

In high-rise commercial buildings with easy access.

Outfit it so that it can handle the majority of fires with minimal effort and an effective attack on non routine fires (correct)

When dealing with multiple fire types simultaneously.

In areas with ample hydrants and low occupancy density.

What is NOT a key factor when selecting a hoseline for a fire response?

Type of water supply available

Average width and height of the buildings

Setback distance from the street

Crew members' personal preferences (correct)

What does the consideration of occupancy have ?

Has a direct bearing on the required fire flow rates and therefor the diameter of the attack line Signup and view all the answers

What is a crucial factor for hoseline selection when responding to a fire?

The building's occupancy and construction Signup and view all the answers

What aspect of a pumper's design should ideally enhance its effectiveness across varying fire situations?

Flexibility to accommodate multiple hose sizes and types. Signup and view all the answers

Which hoseline diameter is NOT commonly used for interior handlines?

3 in. Signup and view all the answers

What should firefighters evaluate before stretching a hoseline?

The task appropriateness of the line Signup and view all the answers

Which method is NOT mentioned for stretching a hoseline?

Via hose reels Signup and view all the answers

What flow rate range for interior handlines is specified?

12-325 gpm Signup and view all the answers

What should be the guiding principle when selecting a hoseline?

The appropriateness of the line for the situation Signup and view all the answers

Which of the following is NOT a mode of attack focused on in the chapter?

Defensive tactics for outdoor approaches Signup and view all the answers

What is one advantage of using a larger hose for firefighting?

It can effectively puncture ceilings and walls. Signup and view all the answers

What determines the appropriate size of a hoseline for a fire?

The combination of sufficient volume and reach of water. Signup and view all the answers

What is the required volume of water for a high-fire-load area?

60 gpm for every 100 square feet. Signup and view all the answers

Which material has the highest heat release per pound, necessitating more water for extinguishment?

Styrene foam Signup and view all the answers

What is a common mistake firefighters make regarding hose selection?

Using a pre-connect without evaluating the structure. Signup and view all the answers

What contributes to the effectiveness of the initial attack on a fire?

The correct combination of hose size, nozzle type, and stream pattern. Signup and view all the answers

How much water is required to cool 1 pound of wrapping paper to prevent combustion?

1 gallon Signup and view all the answers

Which factor does NOT affect the cooling of burning materials in a fire?

Type of materials involved in the fire. Signup and view all the answers

What factor directly influences the required fire flow rates in firefighting?

Consideration of occupancy Signup and view all the answers

In terms of common fire incidents, which type of occupancy is most frequently encountered?

Residential occupancies Signup and view all the answers

What can be inferred about occupancy in relation to firefighting strategy?

Occupancy affects both fire flow rates and line diameter Signup and view all the answers

What is the first thing to consider when choosing an attack line for firefighting?

The need for speed Signup and view all the answers

How does fire loading influence the choice of hose size?

Less fire loading allows for the use of smaller hoses Signup and view all the answers

Why is a harder-hitting stream important in larger buildings?

To effectively control larger fire areas Signup and view all the answers

What is a key advantage of using a 2 1/2-inch hose compared to smaller hoses?

It provides better reach and striking power. Signup and view all the answers

In what situation might a 2 1/2-inch hose be particularly advantageous?

During operations in strip malls. Signup and view all the answers

How many FFs for a 2 1/2 in hose?

A 2 1/2 in hose using 1 1/4 tip can be handled by two and moved by three Signup and view all the answers

What is the recommended flow rate for most commercial occupancies to effectively combat fires?

0.35 gpm/sq ft Signup and view all the answers

How many lengths of 1½-in. hose are considered the maximum for achieving 125 gpm flow?

4 lengths (200 ft) Signup and view all the answers

What alternative method is suggested when hose stretch exceeds practical distances?

Filling out the stretch with 2½-in. hose Signup and view all the answers

What is a critical factor that may influence the choice of hoseline diameter for firefighting operations?

The occupancy and area of the building Signup and view all the answers

What typical friction loss per 100 ft is expected when using 2½-in. hose?

3-5 psi Signup and view all the answers

What application rate should be used to calculate the necessary water flow for a 20x50 ft commercial building?

0.35 gpm/sq ft Signup and view all the answers

Which preconnect hose diameter allows up to 6 lengths (300 ft) to achieve a flow rate of 200 gpm?

1¾-in. hose and 250gpm for 2in Signup and view all the answers

Which hose diameter is typically required if a fire in a residential occupancy has reached the flashover stage?

1 1/2 inch Signup and view all the answers

What is the recommended flow rate for a 1 3/4 inch hoseline?

180 gpm Signup and view all the answers

What is the disadvantage of walls in residential occupancy in the context of hoseline advancement?

They can create obstacles for hose movement. Signup and view all the answers

In which situation might a unit use a 1 1/2 inch hose?

In single-story homes built on slabs. Signup and view all the answers

What is the flow rate of a navy fog nozzle

54gpm Signup and view all the answers

Note that ___ gpm/sq ft is the recommended flow rate for most commercial occupancies given the predominance of plastics in the current fire environment

.35 Signup and view all the answers

Study Notes

Hoseline Selection and Placement

Approach fire scenes noting visible smoke and assess initial conditions before stretching hoselines.
Priority is to quickly and efficiently deploy the proper size and type of hoseline for effective fire control.
Flow rates for interior handlines range from 12 to 325 gpm, depending on the fire's size and materials involved.
Evaluating occupancy, construction, height, and location of fire is essential for correct hoseline selection.

Factors Influencing Hoseline Stretching

Large buildings generally require larger hoses due to potential fire intensity and reach.
Common practice includes assessing need for larger lines; inappropriate pre-connects can lead to unfavorable outcomes.
Optimal hose diameter impacted by fire loading: smaller lines for light loads, larger for heavy fire involvement.

Water Discharge Requirements

Successful fire extinguishment relies on sufficient water volume and effective reach to target fire directly.
Discharge criteria include covering area with appropriate gallons per minute (gpm) based on fire type and location.

Hazard Assessment and Firefighting Strategy

Use formulas to determine required flow rates, depending on the fuel load and area size (15 gpm for low-fire load to 60 gpm for high).
Familiarize with the characteristics and heat output of fuels; e.g., styrene foam requires more water than wrapping paper for effective cooling.

Size of Hoseline Recommendations

Recommended hose sizes vary from 1/2-inch for small, confined fires to 2 1/2-inch for larger commercial fires.
Practical flows identified include: 1/2-inch hose (125 gpm), 1 3/4-inch hose (180 gpm), and 2-inch hose (225 gpm).

Fire Dynamics and Challenges

Residential fires often need maneuverability and speed; smaller hoses can suffice unless flashover occurs.
Incorporating dividing walls can hinder fire spread but may obstruct hoseline deployment.

Considerations for Larger Fires

Large fires necessitate powerful 2 1/2-inch hoses; smaller hoses produce inadequate flow for extensive operations.
Strip malls: 2 1/2-inch hoses cover depth and height, optimizing fire control.

Effective Command and Resource Management

Preconnected lines should accommodate typical building sizes in the area; limitations on excessively long small-diameter hoses prevent inefficiency.
Maintain hose stretches under manageable lengths to reduce friction loss and maintain required flow rates.

Officer's Protocol and Strategy Execution

Quickly assess building types to determine appropriate hoseline choices, focusing on reach and volume needs.
Ensure fire suppression strategies adapt based on evolving conditions and observable hazards on-site during initial response.

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Description

This quiz explores the various discharge appliances used by modern pumpers, including booster lines and master streams. It examines how fire departments select the appropriate combination of hoses based on their specific area and how first-arriving pumper crews make quick decisions on which line to deploy at a fire scene.