Engine Operations›Evolution 1.2
Official evolution · ADO-Pumper Task Book · September 2024
Objective: Pump to various hose loads while starting on tank water then transition to hydrant supply.
Right foot on brake
Set parking brake
Shift transmission to neutral
Shift from road to pump (engage the pump shift control lever)
Pump engaged light is on
Shift transmission to Drive (D)
OK TO PUMP light is on and
Speedometer registers about 15 mph
Numbered 6–10 on the printed 1.2 sheet. The same five actions are numbered 1–5 on the 1.0 and 1.1 sheets; only the numbering differs.
Emergency/warning lights are on
Change radio to correct channel
Remove right foot from brake
Apparatus does not move
Exit cab after looking both directions
Printed steps 1–11. Both attack lines start on the tank. A + marks a step that is not on the printed sheet.
Verify pump is engaged
Open Tank to Pump
Crack re-circulating/tank fill valve
Set to PSI mode (if equipped)
The changeover task calls this same action setting the transfer valve:
“Step 4: Set the transfer valve to the series (to PSI or RMP) positon depending on application.”
ADO Task #19 Basic Pump Skills-Changeover, Operating Procedure Step 4 — quoted as printed
Prime Pump (if necessary)
Set wheel chocks
“Step 1: Position the apparatus in a safe positon, and immobilize it by setting the parking brake and chocking the wheels.”
ADO Task #19 Basic Pump Skills-Changeover, Operating Procedure Step 1 — the chock is part of immobilizing the rig, not an optional extra
Clear hose bed
Check lines are fully deployed before you charge them.
Break attack line (if necessary)
Open correct discharge
CALCULATE PDP
“In order to establish and maintain proper pumping pressures, all Engineers must know how many hoselines, the size and length of the hoseline, the type of nozzles being used, and their flow.”
Engine Company Operations, Ch.1 Firefighter Assignments, p.1-11. This evolution flows two different hose loads, so there are two pressures to work out — not one.
Set discharge to the right pressure
Mark or note discharge gauge & line length/location.
Printed steps 12–18, with the muscle-memory steps merged in where they belong. The + steps are not on the printed sheet.
SET DISCHARGE RELIEF VALVE TO ~150
“…then when I introduce hydrant water there isn't as much of a pressure spike and the discharge relief valve will catch any extra. Then after hydrant is fully opened I can throttle back down.”
Engineer Anderson, 2026-08-30 review. The changeover task agrees on the order: “Step 6: Set the relief valve or pressure governor” comes before “Step 8: When an external supply becomes available, open the intake valve” — the printed sheet leaves its relief-valve step until step 18, after the changeover is done.
THROTTLE UP TO 150 PSI
GATE DOWN HANDLINES TO THEIR SET PDP
Each line keeps flowing at its correct pressure while the pump carries the higher pre-set.
CONNECT LDH SUPPLY
OPEN PRESSURE RELIEF VALVE
“Air in the empty supply hose will cause problems if it enters the pump while the pump is supplying attack lines under pressure. To purge this air, open the bleeder valve on the gated intake line so that the air can escape as the supply line fills with water.”
ADO Task #19 Basic Pump Skills-Changeover, opening narrative
The printed 1.2 sheet never opens the bleeder — it only closes it (step 13), and only after the intake is already open. Evolution 1.0 has the correct order: close the intake bleeder valve before opening the intake. This sheet carries the missing step.
SIGNAL FOR WATER
CLOSE PRESSURE RELIEF VALVE
“When all the air has been forced from the line, close the bleeder valve. The water is now at the pump and ready for the transition.”
ADO Task #19 Basic Pump Skills-Changeover, opening narrative
Open intake from hydrant slowly, make sure Pressure governor adjusts pump pressure or manually adjust pressure if needed.
“To begin the transition, the operator opens the intake valve from the supply line very slowly while observing the pressure on the intake and discharge gauges. Start opening intake valve and adjusting the discharge pressure until the intake is completely open. It may be necessary to adjust the engine throttle to get the desire discharge pressure.”
ADO Task #19 Basic Pump Skills-Changeover, opening narrative — quoted as printed. The drill standard: hand lines feel approximately 10 psi of change or less.
THROTTLE BACK DOWN (ONCE HYDRANT IS FULLY OPEN)
Close intake bleeder valve and tank to pump
With the bleeder already handled during the air purge above, the working action left in this printed step is closing tank to pump. The changeover task pairs that with the intake:
“Step 8: When an external supply becomes available, open the intake valve while closing the tank-to-pump valve (if necessary).”
ADO Task #19 Basic Pump Skills-Changeover, Operating Procedure Step 8
Check discharge pressure and adjust if needed
REFILL TANK
“However, the (tank-fill) valve should be left partially open until the water tank has been refilled. Note: A full tank provides a limited reserve water supply in the event that the external water supply is lost unexpectedly.”
ADO Task #19 Basic Pump Skills-Changeover, opening narrative; Step 8 adds “divert enough of it through the tank-fill line to replenish the supply in the tank.” The printed 1.2 sheet has no refill step — the tank-fill valve is only cracked back at step 3 and never revisited. Evolution 1.0 carries it: “Open tank fill to refill or confirm tank is full.”
*NOTE STATIC HYDRANT PRESSURE*
Open second discharge and set to correct pressure
The second attack line must be different from the first — that is the drill.
Mark intake gauge
MAINTAIN 20 PSI INTAKE PRESSURE
20 psi minimum protects from drawing a vacuum on the intake hose.
The manual gives the gauge a second job on this evolution — it is how you know whether you can add the next line:
“They should also monitor the residual pressure of the pump master intake gauge to determine the capability of supplying additional volumes when available or as needed.”
Engine Company Operations, Ch.1 Firefighter Assignments, p.1-11; intake minimum per Engineer Anderson's evolution card. Carried on Evolution 1.0 as a printed step.
Verbalize supply is established
Set manual discharge relief valve
Manual valve: Engine 31 · Engine 3820 · Ladder 32Task #19 — Basic Pump Skills-Changeover (Transition to an External Water Supply) — is the department's written doctrine for exactly this evolution. Quoted in full, as printed.
“Transition from the water tank to an external water supply source most commonly involves the use of a pressurized source. This will be a hose-line being supplied by another apparatus or from a fire hydrant.”
“Air in the empty supply hose will cause problems if it enters the pump while the pump is supplying attack lines under pressure. To purge this air, open the bleeder valve on the gated intake line so that the air can escape as the supply line fills with water. When all the air has been forced from the line, close the bleeder valve. The water is now at the pump and ready for the transition.”
“To begin the transition, the operator opens the intake valve from the supply line very slowly while observing the pressure on the intake and discharge gauges. Start opening intake valve and adjusting the discharge pressure until the intake is completely open. It may be necessary to adjust the engine throttle to get the desire discharge pressure. After the intake valve is opened, the tank-to-pump valve can be closed. However, the (tank-fill) valve should be left partially open until the water tank has been refilled. Note: A full tank provides a limited reserve water supply in the event that the external water supply is lost unexpectedly.”
ADO Task #19 Basic Pump Skills-Changeover, opening narrative — quoted verbatim, including the printed spellings
ADO Task #19 Basic Pump Skills-Changeover, Operating Procedure — quoted verbatim, including the printed spellings
Bleeder valve. Task #19 opens the intake bleeder before the transition so air escapes as the supply line fills, and closes it once water is at the pump. The printed 1.2 sheet never opens it and closes it only after the intake is open (step 13). Evolution 1.0 has the correct order.
Tank refill. Task #19 requires the tank to be replenished once supply is adequate, as a reserve against losing the external supply. The printed 1.2 sheet has no refill step; Evolution 1.0 carries one.
Relief valve timing. Task #19 sets the relief valve or governor (Step 6) before the intake is opened (Step 8). The printed 1.2 sheet leaves “Set manual discharge relief valve” as its final step (18), after the changeover is complete and two lines are flowing.
Tank-to-pump timing. Task #19 closes tank-to-pump while the intake opens; the printed sheet fully opens the intake first (step 12), then closes tank-to-pump (step 13).
ADO Task #19 Basic Pump Skills-Changeover vs. ADO-Pumper Task Book, Evolution 1.2 (September 2024 Version). The merged sequence above resolves each of these on the sheet.
Engine Company Operations Ch.1 (Firefighter Assignments) and Ch.5 (Water Supply) are the doctrine behind the two halves of this evolution — carrying several lines at once, and getting off the tank onto a hydrant. Page numbers are the manual's own.
“In order to establish and maintain proper pumping pressures, all Engineers must know how many hoselines, the size and length of the hoseline, the type of nozzles being used, and their flow.”
“It is imperative that the Engineer listen closely to the radio at all times for traffic concerning charging, shutting down or adjusting hose line pressures on hose lines.”
Engine Company Operations, Ch.1 Firefighter Assignments, p.1-11
“The Engineer must control how many and what type streams and hose lines are supplied and should confer with and advise the officer when necessary.”
“Must know how many hose lines, size, length, nozzles, and the flow rates of their apparatus. (per OFD hydraulic standard)”
Engine Company Operations, Ch.1 Firefighter Assignments, p.1-8 — Engineer / ADO (Driver), description and Responsibility 3
This is why steps 10, 11 and 15 exist as separate actions: two different hose loads, two different pressures, each one marked or noted so it can be re-set after the changeover.
“They should also monitor the residual pressure of the pump master intake gauge to determine the capability of supplying additional volumes when available or as needed.”
Engine Company Operations, Ch.1 Firefighter Assignments, p.1-11
Printed step 16 — “Mark intake gauge” — is that reading. Noting the static pressure before the intake is opened and the residual after it is what tells you whether the second line, and any line after it, is there to be had.
“Most fires can be controlled with the available water carried in the booster tank. However, for redundancy and in those cases where supplement water is required for prolonged operations the engine company relies on the municipal water system.”
“This doesn’t eliminate the need to use the on-board booster tank to supply the initial fire attack, but rather limits the amount of water that will have to be used while waiting for the hydrant water to arrive.”
Engine Company Operations, Ch.5 Water Supply, p.5-1
The changeover is the moment that hand-off happens. The drill standard — approximately 10 psi or less felt at the hand lines — is the measure of doing it without the crew noticing.
“It is important to remember, when a dry-barrel hydrant is charged no additional lines may be added to the other outlets unless the hydrant is shut down or a shut off valve is added prior to charging.”
“To accommodate additional water supply needs, multi-outlet dry barrel hydrants must have a 2 1/2” hydrant gate-valve attached to an unused outlet at the onset of any hydrant operation.”
Engine Company Operations, Ch.5 Water Supply, p.5-2 — Dry-Barrel
On a dry barrel the stem valve feeds every outlet at once, so the gate valves go on before the water does. Once the hydrant is charged the decision is made for you.
“The nationally recognized direction to open hydrant stem valves is counter-clockwise(“Open-Left”).”
Engine Company Operations, Ch.5 Water Supply, p.5-5 — Stem Valve Rotation
“The ‘Wet’ Lead: The back-up firefighter will remain at the hydrant and charge the line when the command to do so is received.”
“The ‘Dry’ Lead: The Tailboard firefighter anchors the hose, leaves the hydrant bucket, and proceeds to the fire with his/her crew. Other personnel will be assigned to charge the hydrant.”
Engine Company Operations, Ch.5 Water Supply, p.5-8 — Forward Lay, operational modes
Which of the two you are working decides whether your signal for water reaches someone already standing at the hydrant, or has to be assigned first. On a dry lead the water is further away than the hose suggests.
“Whatever decision the first-in Company Officer chooses to select, they MUST announce over the radio their water supply intentions so that the second due engine can adjust their strategies accordantly.”
Engine Company Operations, Ch.5 Water Supply, p.5-1 — quoted as printed
1st Engine Company, residential: “Size-up & 360 if not completed. Stretch initial attack line to fire floor. Initiate water supply if determined by CO.”
2nd Engine Company, residential: “Complete water supply, Pump hydrant for 1st engine if needed. Stretch 2nd attack line (Outside, Floor above fire, Basement).”
OFD Quick Reference Guide for Initial Company Operations, May 2024 — Engine Company Functions
Evolution 1.2 is the first-due version of that: initiate your own supply while your lines are already flowing off the tank. The guide carries its own caveat — “This document is a quick reference document and is not designed to override or replace understanding of the full applicable Manuals.”
Sources. ADO-Pumper Task Book, Evolution 1.2 “Changeover & Supply Various Hose Loads” (September 2024 Version, City of Orem Fire Department) — printed steps verbatim, in printed order, with printed numbering. ADO Task #19 Basic Pump Skills-Changeover (Transition to an External Water Supply), quoted in full. Engine Company Operations, Ch.1 Firefighter Assignments (pp.1-8, 1-11) and Ch.5 Water Supply (pp.5-1, 5-2, 5-5, 5-8); OFD Quick Reference Guide for Initial Company Operations, May 2024. Merged + steps and their order per Engineer Jason Anderson's evolution card and 2026-08-30 review.
Version: prototype · Last reviewed 2026-08-30 · Compiled by Engineer Jason Anderson