Essentials of Fire Fighting 7th Edition - Chapter 13

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Questions and Answers

Should not rest on the bottom of a swimming pool?

True (A)

What increases the potential for master stream operations?

  • High fire load
  • Structural collapse (correct)
  • Extreme fire conditions
  • Increased air consumption

What is a characteristic of smooth bore nozzles?

  • Can provide protection to firefighters with a wide fog pattern
  • Feature adjustable discharge patterns
  • Operate at high nozzle pressures
  • Can be used to apply compressed air foam (correct)

Advancing the __________ pre-connect load involves the firefighter placing the nozzle and the fold of the first tier on his or her shoulder.

<p>Triple-layer</p> Signup and view all the answers

Which statement about forward lays is true?

<p>The first coupling to come off the hose bed should be female unless two-way couplings (Storz) are used (A)</p> Signup and view all the answers

What tool is designed to remove discharge caps from hydrants outlets?

<p>Hydrant wrench (A)</p> Signup and view all the answers

What statement about operating large-diameter attack hose lines is true?

<p>The two-firefighter method allows for better maneuvering of the nozzle (C)</p> Signup and view all the answers

What statement about wet-barrel hydrants is true?

<p>Horizontal compression valves are usually at each outlet (D)</p> Signup and view all the answers

If a second hose line is being added to a standpipe connection, it should be deployed:

<p>Down the lower set of stairs, away from the one already deployed up the stairway (D)</p> Signup and view all the answers

The internal working parts of a fire hydrant are usually made of:

<p>Bronze (D)</p> Signup and view all the answers

What describes a constant gallonage fog nozzle?

<p>Adjustable-pattern fog nozzle that discharges at a constant rate throughout the range of patterns at a designed nozzle pressure (D)</p> Signup and view all the answers

What is a critical consideration when determining static water sources?

<p>Vehicle access to the site (A)</p> Signup and view all the answers

At 212 F water expands approximately __________ times its original volume as it turns into steam.

<p>1700</p> Signup and view all the answers

What is a characteristic of a fog nozzle?

<p>Features adjustable discharge patterns (A)</p> Signup and view all the answers

Dry-barrel hydrants should be either completely open or completely closed because if they are not:

<p>The drain hole remains open and can erode the soil around the base of the hydrant (D)</p> Signup and view all the answers

All wye appliances have:

<p>One single female inlet and two or more male outlets (C)</p> Signup and view all the answers

The size of the nozzle opening or orifice determines the quantity of water flowing from the nozzle and the:

<p>Distance of reach of the stream (A)</p> Signup and view all the answers

Which type of stream will expose the maximum water surface for heat absorption?

<p>Fog (C)</p> Signup and view all the answers

What type of hose appliance combines multiple hose lines into one?

<p>Siamese (C)</p> Signup and view all the answers

What factor increases friction loss in fire hose?

<p>Adding adapters (C)</p> Signup and view all the answers

Broken water mains and hydrants located on dead-end water mains are examples of:

<p>Failures or reduction in water volume or pressure from hydrants (A)</p> Signup and view all the answers

Which of the following is NOT one of three key components to water shuttle operations?

<p>Additional apparatus to draft water to attack pumper (A)</p> Signup and view all the answers

Who should perform technical maintenance on nozzles?

<p>Qualified technicians (B)</p> Signup and view all the answers

When reverse-laying a supply hose, connecting a four-way hydrant valve:

<p>Can be done if the pumper may have to disconnect from the supply hose later and leave the hose connected to the hydrant (C)</p> Signup and view all the answers

What type of hose stream has the lowest forward velocity? (Select one)

<p>Wide-angle fog stream (B)</p> Signup and view all the answers

A hose fitting used to connect a smaller-diameter hose line to the end of a larger one is commonly called a(n): (Select one)

<p>Reducer (D)</p> Signup and view all the answers

What statement about dry-barrel hydrants is true? (Select one)

<p>The stem nut used to open and close the control valve is on top of the hydrant (B)</p> Signup and view all the answers

When a dry-barrel hydrant is open and there is a broken component in the hydrant barrel, you would see: (Select one)

<p>Water bubbling up out of the ground at the base (B)</p> Signup and view all the answers

What is a consideration for opening wet-barrel and dry-barrel hydrants? (Select one)

<p>Closing a hydrant too quickly can damage piping and appliances of adjacent residences (C)</p> Signup and view all the answers

What type of stream is designed for use in attics, cocklofts, basements, and other confined spaces? (Select one)

<p>Broken (A)</p> Signup and view all the answers

What hydrant discharge outlets are considered standard? (Select one)

<p>At least one large outlet (4'' or 4 1/2'') and two hose outlets for 2 1/2'' couplings (C)</p> Signup and view all the answers

What type of valve is used to control the flow from a hydrant? (Select one)

<p>Gate valve (C)</p> Signup and view all the answers

Swimming pools, large above-ground animal water tanks, and portable water tanks are considered to be: (Select one)

<p>Static water sources (A)</p> Signup and view all the answers

The velocity of a stream of water from a smooth bore nozzle is a result of: (Select one)

<p>Nozzle pressure (B)</p> Signup and view all the answers

What type of valve is used on large pump intakes and incorporates a flat baffle that turns 90 degrees? (Select one)

<p>Butterfly valve (A)</p> Signup and view all the answers

What is the primary advantage of a nozzle that uses a slide valve? (Select one)

<p>Does not cause turbulence (C)</p> Signup and view all the answers

An outside stretch improvised standpipe: (Select one)

<p>Can be used for lower floors of high-rise buildings (D)</p> Signup and view all the answers

A hose line should be advanced up a ladder: (Select one)

<p>Uncharged unless it is absolutely necessary to charge it ahead of time (A)</p> Signup and view all the answers

What is the optimal arrangement at a water shuttle dump site? (Select one)

<p>Portable tanks should be as level as possible to ensure maximum capacity (C)</p> Signup and view all the answers

What is the maximum recommended gallons per minute for a hand line? (Select one)

<p>350 gpm (A)</p> Signup and view all the answers

How can friction loss be overcome or reduced? (Select one)

<p>Adding parallel hose lines (A)</p> Signup and view all the answers

What flow rate is an automatic master stream fog nozzle typically designed for? (Select one)

<p>350-1250 gpm (B)</p> Signup and view all the answers

What is the purpose of using chafing blocks when deploying hose? (Select one)

<p>Protects hose from abrasions caused by vibrations (A)</p> Signup and view all the answers

What BEST describes the duty of the backup firefighter when employing the two-firefighter method for small hose line operations? (Select one)

<p>Keeping the hose straight behind the nozzle operator (A)</p> Signup and view all the answers

The __________ load and carry is excellent for use on stairways because the hose is not dragged on the ground and is deployed as needed.

<p>Minuteman</p> Signup and view all the answers

Because of high friction loss from flowing large amounts of water, it is not practical to supply master stream appliances with anything less than __________ hose line(s).

<p>Two 2 1/2''</p> Signup and view all the answers

Water will absorb heat the least efficiently in what form? (Select one)

<p>Solid stream (C)</p> Signup and view all the answers

What is a consideration when placing a master stream device? (Select one)

<p>Place the master stream device where it allows the stream to cover the most surface area of the building (B)</p> Signup and view all the answers

When the stem nut of a dry-barrel hydrant is turned counterclockwise: (Select one)

<p>The main valve moves down (C)</p> Signup and view all the answers

Which type of hose stream can more easily penetrate and saturate burning materials? (Select one)

<p>Solid (C)</p> Signup and view all the answers

In what type of structure would you MOST likely need to create an improvised standpipe? (Select one)

<p>A three-story hotel built during the early 20th century (B)</p> Signup and view all the answers

Automatic fog nozzles maintain a near constant __________ , regardless of the pattern setting. (Select one)

<p>Pressure (A)</p> Signup and view all the answers

Which nozzle is considered to be a broken-stream delivery device? (Select one)

<p>Piercing nozzle (B)</p> Signup and view all the answers

When making a hydrant connection during a forward lay, what would be the next step after removing enough supply hose to reach the hydrant? (Select one)

<p>Wrap the hose line around the hydrant (A)</p> Signup and view all the answers

In what type of situation is it NOT acceptable for a single firefighter to operate a small hose line? (Select one)

<p>Interior fire attack (D)</p> Signup and view all the answers

Advancing hose lines is easiest when: (Select one)

<p>Carrying the hose over flat surfaces (A)</p> Signup and view all the answers

What type of valve incorporates a flat disk hinged on one side which swings open and closed to allow water to flow in only one direction? (Select one)

<p>Clapper valve (D)</p> Signup and view all the answers

Connecting a pumper to a fire hydrant using hard intake hose: (Select one)

<p>Can be considerably more difficult because it requires careful positioning of the pumper (D)</p> Signup and view all the answers

Which of the following will make the nozzle easier to handle? (Select one)

<p>A wide fog pattern (C)</p> Signup and view all the answers

In which situation would a four-way hydrant valve likely be used? (Select one)

<p>If the supply line is a long length of 2 1/2'' or 3'' hose (A)</p> Signup and view all the answers

What factor would NOT affect the quality of a hose stream? (Select one)

<p>Water temperature (B)</p> Signup and view all the answers

If two nozzles have the same PSI and flow rate, the one producing a solid stream will have the longest reach because: (Select one)

<p>Its water droplets are less affected by friction in the air (B)</p> Signup and view all the answers

When advancing a charged hose line up a stairway: (Select one)

<p>Excess hose should be deployed on the stairs toward the floor above the fire floor (C)</p> Signup and view all the answers

Which statement about reverse lays is true? (Select one)

<p>The reverse lay most directly supplements hydrant pressure and establishes drafting operations (A)</p> Signup and view all the answers

What do standard fire hydrant outlets have that allow fire departments to connect hose to them? (Select one)

<p>Male threads (C)</p> Signup and view all the answers

What type of tool can be used to protect hose from hazards as they go over parapets and window sills? (Select one)

<p>Hose rollers (D)</p> Signup and view all the answers

Water shuttle operations and relay pumping are two good options for establishing water supply when: (Select one)

<p>Water distribution systems have inadequate volume and pressure (D)</p> Signup and view all the answers

How can you verify that a dry-barrel hydrant is draining when shut down? (Select one)

<p>A slight vacuum should be felt pulling your palm toward a single open discharge (D)</p> Signup and view all the answers

Water hammer occurs when: (Select one)

<p>Moving water reaches a closed nozzle and stops with great force (B)</p> Signup and view all the answers

What most directly determines the quantity of water flowing from the nozzle? (Select one)

<p>Nozzle pressure (B)</p> Signup and view all the answers

When advancing a hose into a structure: (Select one)

<p>An uncharged attack hose line should first be advanced to the designated point of entry (D)</p> Signup and view all the answers

Which statement about connecting a pumper to a hydrant with a soft suction hose is correct? (Select one)

<p>It is more efficient to connect a 4 1/2'' or larger intake hose to a hydrant with only 2 1/2'' outlets using a reducer coupling (D)</p> Signup and view all the answers

Intake strainers attached to the drafting end of a hard-suction hose:

<p>prevent debris from entering the hose and pump system</p> Signup and view all the answers

Flashcards

Wide-Angle Fog Stream

A hose stream type known for its wide spread and low forward velocity, making it suitable for cooling large areas and suppressing flames.

Solid Stream

A hose stream type characterized by its concentrated, powerful jet of water, ideal for penetrating burning materials and quickly extinguishing fires.

Broken Stream

A hose stream type with a broken or intermittent flow, designed for use in confined spaces like attics and basements, where a continuous stream might cause damage or pose a hazard.

Reducer

A hose fitting used to connect hoses of different diameters, allowing for flexibility in hose configurations.

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Gate Valve

A valve used to control the flow of water from hydrants, typically found on the hydrant itself.

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Butterfly Valve

A valve used to control the flow of water from large pump intakes, offering a quick and efficient method for managing water flow.

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Four-Way Hydrant Valve

A type of hydrant valve with four outlets, providing flexibility for different water supply configurations and extending the reach of hoses.

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Hose Roller

A device used to protect hoses from abrasion when navigating over obstacles like parapets and window sills, maintaining hose integrity during deployment.

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Dry-Barrel Hydrant

A type of fire hydrant with a dry barrel that sits above ground, equipped with a stem nut on top, where water bubbles at the base if the hydrant is damaged.

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Wet-Barrel Hydrant

A type of fire hydrant with a wet barrel that sits below ground, requiring careful operation to avoid damaging adjacent pipes when opening or closing.

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Standard Hydrant Outlets

The protruding outlets on fire hydrants that are designed to connect securely to hoses, using male threads for a snug fit.

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Portable Tanks

Large, portable water tanks used during shuttle operations, requiring a level surface to maximize water capacity.

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Automatic Master Stream Fog Nozzle

A type of master stream nozzle that automatically adjusts flow rates between 350-1250 gpm, maintaining a near constant pressure for efficient fire suppression.

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Smooth Bore Nozzle

A type of nozzle that creates a smooth, concentrated stream of water, capable of applying compressed air foam and operating at high pressures for forceful water delivery.

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Chafing Blocks

Padding used to protect hoses from abrasion during deployment, preventing wear and tear on the hose while it's being stretched.

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Backup Firefighter

A firefighter's role in two-person hose operations, ensuring the hose line remains straight and stable, providing support for the firefighter handling the nozzle.

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MinuteMan Load

A method of loading a hose line for efficient use in stairwells, allowing the hose to be easily deployed and retrieved without dragging.

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Advance with Uncharged Line

A safety practice for moving through tight spaces during fire suppression, where the hose line is advanced without water pressure to facilitate maneuverability.

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Master Stream Operations

A fire suppression method involving high volumes of water delivered with a master stream nozzle, raising concerns about potential structural collapse due to the water load.

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Two 2 1/2'' Lines

A recommendation for supplying master stream nozzles to avoid water pressure loss from friction caused by the long hose line.

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Verify Drainage

A method to verify the proper function of dry-barrel hydrants by feeling for a vacuum at the open discharge, ensuring the hydrant is properly drained before use.

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Improvised Standpipe

A technique for creating improvised standpipes in multi-story buildings, particularly suitable for three-story hotels where access challenges exist.

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Poor Water Pressure

A situation where insufficient water pressure in a distribution system necessitates the use of shuttle operations or relay pumping to deliver adequate water supply to the fire.

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Water Hammer

A phenomenon that occurs when moving water suddenly encounters a closed nozzle, causing a rapid pressure spike and potentially damaging the hose line.

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Connecting to Hydrants

A technique for connecting hose lines to hydrants, involving wrapping the hose around the hydrant for increased stability and security.

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Directing Excess Hose

A practice to ensure clear pathways during hose line advances, where excess hose is directed toward floors above the fire, keeping the ground level clear for movement.

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Forward Lays

A hose lay strategy where the hose line is efficiently stretched from the water source, allowing the pumper to stay at the water source for continued water supply.

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Hose Stream Factors

Factors that affect the quality of a hose stream, including air friction, gravity, nozzle condition, but not water temperature.

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Positioning the Hose

A critical aspect of hose operation where the hose line is strategically positioned to maximize water coverage and effectiveness during fire suppression.

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Two-Person Operations

A safety precaution emphasizing the importance of having at least two firefighters present during interior fire attacks involving small hose lines, ensuring safety and backup in case of emergencies.

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First Coupling

The first coupling on a hose bed, which is typically female unless Storz couplings are being used, allowing for flexibility in hose configurations.

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Hydrant Wrench

A specialized tool designed for removing discharge caps and opening fire hydrant valves, essential for accessing the water supply from hydrants.

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Large-Diameter Hose Lines

Large-diameter hose lines that require at least two firefighters for efficient maneuvering, providing support and control during deployment.

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Horizontal Compression Valve

A type of valve commonly found on wet-barrel hydrants, controlling the flow of water from each outlet, providing individual control for each hose connection.

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Not Freeze-Resistant

The disadvantage of wet-barrel hydrants, as they are not designed for areas with freezing temperatures, posing a risk of freezing and damage to the internal components.

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Standpipe Connection

A safety practice when connecting a second hose line to a standpipe, where the second line is deployed down the lower set of stairs to avoid confusion and maintain clarity during firefighting operations.

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Fire Hydrant Internal Parts

The material commonly used for internal components of fire hydrants, offering durability and resistance to corrosion, ensuring reliable operation.

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Complete Hydrant Operation

A crucial operating procedure for dry-barrel hydrants, requiring complete opening or closing to prevent water erosion around the base due to the drainage function of the drain hole.

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Constant Gallonage Fog Nozzle

A specialized type of fog nozzle designed to maintain a constant water flow rate regardless of the pressure, providing consistent water delivery.

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Adjustable Discharge Pattern

A key feature of fog nozzles, allowing adjustment of the water discharge pattern to maximize water surface exposure and effectively absorb heat from flames.

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Water Source Factors

Factors considered when selecting static water sources for firefighting operations, ensuring access for vehicles, equipment, and easy water supply.

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Water Supply Issues

Potential problems that arise from damaged water infrastructure like broken mains and hydrants on dead-end lines, affecting water flow and pressure.

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Wye Appliance

A type of hose appliance with one female inlet and multiple male outlets, providing flexibility in hose line branching and water distribution.

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Adapters and Friction Loss

A factor that increases friction loss in hose lines, occurring when adapters are used to connect different hose sizes or fittings.

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Shuttle Operation Components

The key elements of effective water shuttle operations, involving a designated dump site at the fire for water delivery and a fill site at the water source for replenishing the water tank.

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Nozzle Maintenance

The importance of regular technical maintenance for nozzles to ensure proper functionality and performance, performed by qualified personnel.

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Reverse-Laying Supply Hose

A hose layout strategy where the supply hose is laid in reverse order, potentially requiring a four-way hydrant valve to ensure accurate connections for efficient water flow.

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Study Notes

Hose Streams

  • Wide-angle fog streams possess the lowest forward velocity.
  • Solid streams are ideal for penetrating and saturating burning materials.
  • Broken streams are suitable for confined spaces like attics and basements.
  • The velocity of water from a smooth bore nozzle is reliant on nozzle pressure.

Hose Fittings and Equipment

  • A reducer connects smaller-diameter hoses to larger ones.
  • Gate valves control the flow from hydrants, while butterfly valves can be used on large pump intakes.
  • Four-way hydrant valves allow for flexible water flow management with longer supply lines.
  • Hose rollers protect hoses when navigating over parapets and window sills.

Hydrant Operations

  • Dry-barrel hydrant stem nuts are located on top; their proper function is indicated by water bubbling at the base if damaged.
  • Wet-barrel and dry-barrel hydrants need careful handling; quick closure can damage adjacent pipes.
  • Standard hydrant outlets have male threads for connecting hoses.
  • Portable tanks should be level to maximize water capacity during shuttle operations.

Nozzle Types and Flow Rates

  • Automatic master stream fog nozzles typically flow between 350-1250 gpm and maintain near constant pressure.
  • Smooth bore nozzles can apply compressed air foam and operate at high nozzle pressures.
  • Chafing blocks are crucial for protecting hoses from abrasion during deployments.

Firefighter Operations

  • During two-person operations with a hose line, the backup firefighter ensures that the line remains straight.
  • A minuteman load allows for efficient hose use in stairways without dragging.
  • Advances should be made with uncharged lines to facilitate ease of movement through tight spaces.

Master Stream and Drafting Considerations

  • Master stream operations raise concerns about structural collapse due to increased water volume.
  • Two 2 1/2'' lines are recommended for supplying master streams to mitigate friction loss.
  • Verify the drainage of dry-barrel hydrants by feeling for a vacuum at open discharges.

Special Situations

  • For creating improvised standpipes, three-story hotels are prime candidates due to elevated access challenges.
  • Poor water pressure in distribution systems necessitates shuttle operations or relay pumping.
  • Water hammer can occur if moving water abruptly strikes a closed nozzle; this is often characterized by a quick, forceful stop.

Advancing and Connecting Hose Lines

  • When connecting to hydrants, wrap the hose line around to ensure stability.
  • During advances, excess hose should be directed toward floors above the fire to keep clear pathways.
  • Forward lays stretch hose efficiently when the pumper must stay at the water source.

Miscellaneous

  • Air friction, gravity, and the condition of the nozzle affect hose stream quality, while water temperature does not.
  • The hose line should be positioned to maximize effectiveness and water coverage during operations.
  • Operation of small hose lines should not be done alone during interior fire attacks to ensure safety.### Couplings and Hydrant Tools
  • First coupling from the hose bed should be female unless using Storz couplings.
  • Hydrant wrench specifically designed to remove discharge caps and open fire hydrant valves.

Large-Diameter Attack Hose Lines

  • Operating large-diameter attack hose lines typically requires at least two firefighters for effective maneuvering.

Wet-Barrel Hydrants

  • Horizontal compression valves are present at each outlet.
  • Wet-barrel hydrants are not designed for freezing climates.

Standpipe Connections

  • When adding a second hose line to a standpipe, it should be deployed down the lower set of stairs, ensuring clarity and avoiding confusion.

Fire Hydrant Components

  • Internal parts of a fire hydrant are generally made of bronze for durability.
  • Dry-barrel hydrants require complete opening or closing to prevent soil erosion around the base due to function of the drain hole.

Nozzle Types and Functions

  • Constant gallonage fog nozzles maintain a constant pressure through various discharge rates.
  • Fog nozzles feature adjustable discharge patterns and maximize water surface exposure for effective heat absorption.

Water Supply Considerations

  • Critical factors when determining static water sources include vehicle access to the site.
  • Water volume or pressure issues may arise from broken mains and hydrants on dead-end lines.

Hose Equipment and Operations

  • Wye appliances consist of one female inlet and multiple male outlets, allowing diverse flow configurations.
  • Adding adapters to fire hose increases friction loss.

Water Shuttle Operations

  • Essential components for effective water shuttle operations include a dump site at the fire and a fill site at the water source.

Maintenance and Operations

  • Qualified technicians should handle technical maintenance of nozzles to ensure proper functionality.
  • Reverse-laying supply hose may require a four-way hydrant valve to maintain correct connections for effective water flow.

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