Podcast
Questions and Answers
What is the advantage of having a pumper at the hydrant in a reverse lay operation?
What is the advantage of having a pumper at the hydrant in a reverse lay operation?
Why may a reverse lay not be a viable option in certain situations?
Why may a reverse lay not be a viable option in certain situations?
What is the primary disadvantage of Plan C: Forward Lay by Second Engine?
What is the primary disadvantage of Plan C: Forward Lay by Second Engine?
What is the total available water for initial operations in Plan C?
What is the total available water for initial operations in Plan C?
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What is the advantage of having more combat-ready personnel on scene in a reverse lay operation?
What is the advantage of having more combat-ready personnel on scene in a reverse lay operation?
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What is the purpose of the second-due engine in Plan C?
What is the purpose of the second-due engine in Plan C?
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Why is Plan D: Forward Lay by First-Due Engine a comfortable tactic for the District?
Why is Plan D: Forward Lay by First-Due Engine a comfortable tactic for the District?
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What is the disadvantage of Plan D: Forward Lay by First-Due Engine?
What is the disadvantage of Plan D: Forward Lay by First-Due Engine?
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What is the alternative to reverse lay if it is not easily implementable?
What is the alternative to reverse lay if it is not easily implementable?
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What is the advantage of laying the supply line away from the scene in a reverse lay operation?
What is the advantage of laying the supply line away from the scene in a reverse lay operation?
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Study Notes
Engineer's Role in Incident Mitigation
- Engineers must be able to think and act independently, even outside of their skillset, in situations such as operating an aerial in a high-rise rescue.
- Practicing all skillsets of the Engineer position is critical to successful incident mitigation.
Pump Chart Introduction
- The purpose of a pump chart is to provide pump operators with a shortcut to calculate the Total Pump Discharge Pressure (PDP).
- The pump chart provides values to get the pump operator within a range of an effective flow rate.
- Friction loss in a hose line varies based on factors such as manufacturing processes, materials, materials used, temperature, wear, and age.
Pump Chart Components
- The pump chart includes values for different nozzle sizes, flow rates, and friction loss.
- The chart is used to calculate the PDP using the formula: PDP = NP + FL + APPL + ELEV.
Pump Chart Examples
- Example 1: Calculating Friction Loss (FL) using the formula: FL = CQ2L.
- Example 2: Calculating PDP using the formula: PDP = NP + FL + APPL + ELEV.
- The St. John's Fire District Pump Chart is a tool that simplifies the calculation of PDP variables.
Standpipe and Supply Operations
- The standpipe and supply operation chart provides values for nozzle pressure, flow rate, and friction loss.
- The chart is used to calculate the PDP for standpipe operations.
Defensive Operations
- The deck gun and aerial water way operations have different PDP calculations.
- The deck gun operation uses a fixed PDP of 100 psi, while the aerial water way operation uses the formula: PDP = 100 psi + EVEL.
Water Supply
- The establishment of water supply is an integral component of effective mitigation.
- Engine companies should factor hydrant location into their apparatus placement.
- There are four plans for water supply operations: Plan A, Plan B (Reverse Lay), Plan C (Forward Lay with Booster Tank Backup), and Plan D (Forward Lay by First-Due Engine).
Plan B (Reverse Lay)
- The second-due engine lays away from the scene and establishes the water supply.
- The apparatus operator can pump the hydrant if a relay is required.
- The advantages of Reverse Lay include: more combat-ready personnel on scene, less likelihood of blocking the scene, enhanced flow capacity, and pump redundancy.
Plan C (Forward Lay with Booster Tank Backup)
- The second-due engine lays from the hydrant and proceeds to the scene, sharing its booster tank water with the first-due engine.
- This plan provides a total of 2,000 gallons of available water for initial operations.
- The primary disadvantage is that an individual from either the second-due engine or subsequent units must charge the hydrant.
Plan D (Forward Lay by First-Due Engine)
- This plan has been the typical water supply tactic utilized by the District.
- The primary disadvantage is that it delays the arrival of the first-due engine on scene to assess for life safety considerations.
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Description
This quiz assesses an engineer's ability to think and act independently in high-pressure situations. Scenarios include correcting errors with apparatus and conducting rescues in high-rise buildings.
