Fire pump installation in short: pour a rigid concrete foundation, set the unit on shims and fill the base with non-shrink grout, check pump-to-driver alignment, then install the suction line with an eccentric reducer and the discharge line with its valves, add the pressure sensing line and controller, flush and hydrostatically test the piping, and finish with the NFPA 20 field acceptance test.
This article follows the installation sequence as it happens on site, step by step, with the hold point that should not be skipped at each stage. The technical references are NFPA 20 (2025 edition) and the pump manufacturer’s installation, operation and maintenance manual (IOM). Neither replaces the other. AZEIDK carries out this work through its installation and implementation service for the fire pumps it supplies in Saudi Arabia.
Key takeaways
- NFPA 20 requires the foundation to be substantial enough to form a permanent and rigid support for the base plate.
- Alignment is checked before piping, after grouting and bolting down, after the piping is connected, and before the first run.
- No control valve other than a listed OS&Y gate valve is allowed in the suction pipe within 50 ft (15 m) of the suction flange.
- Piping must never hang on the pump flanges: each line has its own supports close to the pump.
- The pump is not handed over until it passes the field acceptance test at churn, 100% and 150% of rated flow.
In this article
- What do you need before installing a fire pump?
- Step 1: The concrete foundation
- Step 2: Levelling and grouting
- Step 3: Pump-to-driver alignment
- Step 4: Installing the fire pump suction line
- Step 5: Discharge line and valves
- Step 6: Pressure sensing line
- Step 7: Controller and power supply
- Step 8: Flushing and hydrostatic testing
- Step 9: First run and field acceptance test
- Fire pump installation at a glance: stages and hold points
- Common fire pump installation mistakes
- Fire pumps AZEIDK supplies and installs
- Frequently asked questions
What do you need before installing a fire pump?
Before the unit arrives you need the approved shop drawings of the pump room, the approved submittal for the pump, driver and controller, the certified factory test curve for the same serial number, and the IOM for that model. The Saudi Fire Code (SBC 801) has a dedicated fire pump section, and the designer and the authority having jurisdiction set the NFPA 20 edition that applies to the project.
On delivery, compare the pump and driver nameplates with the submittal (model, flow, pressure, speed) and keep the flange covers on until installation. Room requirements such as location, ventilation, drainage and service clearances are covered in our fire pump room guide.
Step 1: The concrete foundation
NFPA 20 requires the foundation to be sufficiently substantial to form a permanent and rigid support for the base plate. Dimensions and anchor bolt positions come from the manufacturer’s dimension drawing for the model on site, not from a previous project.
The A-C Fire Pump 8200 Series manual quotes the Hydraulic Institute recommendation that the foundation weigh at least five times the weight of the pumping unit. The same manual says to:
- pour the foundation without interruption to within ½ to 1½ in (1.3 to 3.8 cm) of the finished height, leaving room for grout, and score the top before it sets;
- optionally fit a sleeve around the top of each anchor bolt for some adjustment, with bolts long enough for grout, shims, base flange, nuts and washers;
- let the foundation cure for several days before setting and grouting the base plate.
Step 2: Levelling and grouting
The unit is set on metal shims or wedges at each anchor bolt and midway between them. The Aurora Model 384 end suction fire pump IOM specifies a gap of ¾ to 1½ in (1.9 to 3.8 cm) under the base plate for grout. Shims are adjusted until the pump shaft and flanges are level; the A-C manual points out that the base plate itself does not need to be level.
After tightening the nuts and a first alignment check, grout as follows:
- Build a strong wooden form around the base, soak the concrete surface and remove standing water.
- Fill the base plate completely with an approved non-shrink grout, working it to release air bubbles.
- Connect no piping until the grout is dry. The A-C manual states that 24 hours is sufficient with an approved grouting procedure.
- Once hard, check and retighten the anchor bolts, then recheck alignment.
Step 3: Pump-to-driver alignment
Horizontal pumps (end suction and split case) arrive mounted with their driver on a common base, but the base can twist during shipping and lifting. Alignment is therefore checked in stages:
- before the piping is connected;
- after grouting and tightening the anchor bolts;
- after the suction and discharge lines are connected, which reveals any pipe strain;
- before the first start, since the pump must never run with the coupling out of alignment;
- after the unit reaches operating temperature: the A-C manual notes that final alignment cannot be done until the pump has run for a while.
Tolerances come from the pump and coupling manufacturers. As an example, the Aurora 384 IOM gives 0.004 in TIR parallel and 0.004 in TIR per inch of coupling radius angular, measured with a dial indicator. Those figures belong to one model and should not be carried over to another. A flexible coupling absorbs only small misalignment and does not make up for poor alignment.
Step 4: Installing the fire pump suction line
Suction line mistakes usually show up only at 150% flow. The rules below are NFPA 20 requirements as summarised by Consulting-Specifying Engineer in its article on fire pump piping arrangements; check each one against the edition adopted for the project.
| Item | Rule |
|---|---|
| Valves | No control valve other than a listed OS&Y gate valve within 50 ft (15 m) of the suction flange, butterfly valves included |
| Velocity | Not above 15 ft/s (4.57 m/s) at 150% of rated flow within 10 pipe diameters upstream of the suction flange |
| Elbows and tees | Where the centreline plane is parallel to a horizontal split case pump shaft, at least 10 pipe diameters from the flange |
| Check valves and backflow preventers | At least 10 pipe diameters from the suction flange |
| Reducer | Eccentric tapered type, installed to avoid air pockets |
The eccentric reducer
The suction pipe is often larger than the pump inlet, so a reducer is needed. A concentric reducer leaves a high pocket where air collects, which is why an eccentric reducer is used. The Aurora 384 IOM requires it directly at the suction nozzle with the taper at the bottom (flat side up), and prohibits straight taper reducers on horizontal suction lines. A horizontal line should rise gradually towards the pump with no high points.
Pipe supports and flange strain
The A-C manual puts it simply: run the piping to the pump, never move the pump to meet the pipe. Support each line independently near the pump, align the piping so that no strain reaches the pump when the flange bolts are tightened, and never spring a pipe into place. Vertical turbine pumps are installed over a wet pit or tank and follow their own manufacturer instructions.
Step 5: Discharge line and valves
From the pump flange the discharge line takes an increaser where needed, then a check valve, then an indicating control valve (OS&Y or indicating butterfly) on the system side, as described in the Aurora 384 IOM and the CSE article. The test header connects between the check valve and the control valve so the pump can be tested with the control valve closed.
Electric pumps get a circulation relief valve ahead of the check valve to cool the casing at churn. A main pressure relief valve is used in only two cases: with a diesel driver, where 121% of net rated churn pressure plus maximum static suction pressure exceeds the rating of system components, and with a variable speed pressure limiting controller, where the discharge pressure at churn and rated speed exceeds that rating. Above-ground discharge piping is steel, and its components are rated for the maximum discharge pressure at churn.
Step 6: Pressure sensing line
This is where the controller reads system pressure to decide when to start. It connects between the discharge check valve and the control valve, each controller (jockey included) has its own independent line, and two check valves are fitted at least 5 ft (1.5 m) apart. Material, size and short-cycling causes are covered in our article on the pressure sensing line and relief valve.
Step 7: Controller and power supply
The controller is mounted as close as practical to the driver and within sight of it, protected from water leaking from the pump or its connections. Power wiring for electric pumps follows NFPA 70 Article 695 and the Saudi Electrical Code (SBC 401). Controller signals are then wired to the fire alarm panel: pump running, loss of power or phase, phase reversal, and transfer switch position where fitted. Controller types are explained in our fire pump controller guide.
For diesel pumps the Aurora 384 IOM calls for a slow charge of the batteries for at least 24 hours before start-up and for confirming coolant before energising the jacket water heater.
Step 8: Flushing and hydrostatic testing
The suction line is flushed before it is connected to the pump, because construction debris goes straight into the impeller. Suction and discharge piping is then hydrostatically tested at not less than 200 psi (13.8 bar), or 50 psi (3.4 bar) above the maximum pressure maintained in the system, whichever is greater, with any equipment not rated for that pressure isolated.
Step 9: First run and field acceptance test
Before the first run, vent the casing and make sure the pump is full of water, then bump the driver with the coupling disconnected to confirm rotation against the arrow on the casing. The Aurora 384 IOM then describes an initial run: controller in manual and jockey panel off, packing adjusted to 60 to 120 drops per minute on packed pumps, churn pressure compared with the factory curve, then back to automatic to record the start pressure, with the jockey set to start above the main pump.
The field acceptance test follows at three points: churn, 100% and 150% of rated flow, with pressure at 150% not below 65% of rated pressure. Controller testing includes at least six automatic and six manual starts. AXA XL guidance asks for the pump manufacturer’s representative to inspect the installation and provide the certified factory curve before the test. Details are in our fire pump testing guide, and AZEIDK delivers it through its testing, commissioning and handover service.
Fire pump installation at a glance: stages and hold points
| Stage | Hold point before moving on |
|---|---|
| 1. Foundation | Dimensions and bolt positions per the manufacturer’s drawing |
| 2. Grout | Shaft and flanges level, grout dry |
| 3. Alignment | Readings within the IOM limits |
| 4. Suction | No flange strain, no air pockets |
| 5. Discharge | Components rated for churn pressure |
| 6. Sensing line | Independent line for each controller |
| 7. Electrical | Signals shown on the fire alarm panel |
| 8. Flushing and pressure test | Result recorded and signed |
| 9. Acceptance | Field curve matches the certified curve |
Common fire pump installation mistakes
- Connecting piping before the grout is dry, or not rechecking alignment afterwards.
- Pulling a pipe onto the flange instead of correcting its route.
- A butterfly valve close to the pump on the suction side, or an elbow parallel to a split case shaft right at the flange.
- A concentric reducer on a horizontal suction line.
- One sensing line shared by the main pump and the jockey.
- Treating a churn run as the acceptance test.
Fire pumps AZEIDK supplies and installs
In Saudi Arabia AZEIDK supplies UL-listed Jack Pump end suction (VES), split case (MSC) and vertical turbine (VTP) series, WATEX WE end suction (UL and FM), WS split case (UL) and vertical turbine (UL) pumps, and 3PUMP packages (electric, diesel and jockey). Each model has its own installation manual, which is followed on site. All models are on the fire pumps page, and our installation team handles the foundation, alignment, piping and wiring through to testing.
Frequently asked questions
What are the fire pump installation steps in short?
Foundation, grouting, alignment, suction and discharge piping, sensing line and controller, flushing and hydrostatic test, then the first run and the field acceptance test.
When can piping be connected after grouting?
After the grout is dry, the anchor bolts are tightened and alignment is rechecked. The A-C Fire Pump manual says 24 hours is enough with an approved procedure; the model’s IOM governs.
Why does a fire pump suction need an eccentric reducer?
A concentric reducer leaves a pocket at the top of the line where air collects. NFPA 20 requires an eccentric reducer installed so that air pockets are avoided.
Can a butterfly valve be installed on a fire pump suction line?
No control valve other than a listed OS&Y gate valve is allowed within 50 ft (15 m) of the suction flange. On the discharge side an indicating butterfly valve is acceptable.
How many times is alignment checked during installation?
Before piping, after grouting, after the piping is connected, before the first run, and again at operating temperature as the manufacturer instructs.
Who tests the fire pump after installation?
The installing contractor, witnessed by the authority having jurisdiction, usually with the pump manufacturer’s representative providing the certified curve. AZEIDK covers this in its testing and commissioning service.
Have a fire pump set to install or test? Send us the approved drawings, the pump model and driver type, and our team will define the installation scope and programme through to acceptance. Contact the AZEIDK team
