Evolution 1 — Single Handline from Tank

Overview

The starting point for every pump operator. This evolution teaches the fundamentals of engaging the pump from an internal water supply and flowing a single attack line. Operators learn throttle control, tank-to-pump valve sequencing, and how to read discharge pressure gauges under a controlled, single-line demand. The booster tank is a finite resource — typically 500 to 1,000 gallons depending on the apparatus — so the operator must balance speed with conservation. Every second spent over-throttling or hunting for the right pressure is water lost. This evolution builds the muscle memory that every subsequent evolution depends on: smooth throttle input, steady gauge reading, and calm decision-making under a ticking clock.

Training Objective

Engage the pump from the apparatus booster tank, open a single discharge line, and deliver the correct nozzle pressure to a combination nozzle on a standard pre-connect attack line. The operator must bring the line to target pressure within the time limit while keeping discharge pressure within the scoring tolerance. Tank level must remain above critical threshold throughout the evolution.

Skills Practiced

• Tank-to-pump valve operation and sequencing
• Throttle control and fine pressure regulation
• Discharge gauge reading under single-line demand
• PDP calculation for a single line with known hose length and nozzle type
• Nozzle pressure verification at the discharge gauge
• Tank level monitoring and conservation awareness
• Recognising over-pressurisation before it becomes a safety event

Setup

Single 1¾" pre-connect attack line (200 ft) supplied from the apparatus booster tank. No external water source. Combination fog nozzle at 100 PSI nozzle pressure, flowing approximately 150 GPM. The operator must manage a finite water supply — typically 750 gallons — while maintaining target pressure. The tank-to-pump valve must be opened before any discharge pressure can be established.

Scenario

A residential interior attack. The first-due engine arrives on scene at a single-family dwelling with smoke showing from the front door. The attack crew pulls the pre-connect and makes entry. The operator must get water flowing from the tank before a hydrant connection is established. The crew is counting on water within 60 seconds of pulling the line. Speed and accuracy both matter — too slow and the crew is dry, too fast and you overshoot the pressure and risk a burst coupling or a knocked-down firefighter.

What to Expect

This is a timed evolution. The operator engages the pump, opens the tank-to-pump valve, and brings the discharge line to target pressure. The simulation scores pressure accuracy (how close you hold to the target PDP), time to water (how quickly the line reaches operating pressure), and penalises unsafe conditions like over-pressurisation above 275 PSI or allowing the tank to run dry. Expect the gauges to respond with realistic lag — the needle does not jump instantly when you move the throttle.

Tips

• Know your apparatus tank capacity before starting — it determines how long you can flow
• Open the throttle slowly — small adjustments of 5-10% prevent overshoot
• Monitor the tank level indicator throughout the evolution — it drops faster than you expect at 150 GPM
• Verify nozzle pressure at the discharge gauge, not just the master gauge — they can read differently
• If you overshoot, reduce throttle in small increments rather than making a large correction
• Practice the valve sequence until it is automatic: tank-to-pump open, throttle up, discharge valve open