Fire Pump Room: Environment Requirements, Components and the Path to Approval

1. What the pump room is and what it houses

The fire pump room houses the pressurization set of the firefighting network: the main pump, the standby pump when the design or the state rule requires one, the jockey pump, the control panels, the pressure switches and the valves. It supplies pressurized water to the NBR 13714 hydrants and hose reels and to the NBR 10897 automatic sprinklers whenever the supply depends on a pump.

State rules define the room by the work done in it. São Paulo IT 22 and Goiás NT 22 require dimensions that allow access all around the fire pumps, enough space for any local maintenance on the pumps and the control panel, and the complete removal of any pump. That is why civil design, piping, electrical work and the removal route must be checked together, before assembly.

2. What NFPA 20 and Brazilian rules require from the room

NFPA 20 starts with protection: the pump, driver, controller, water supply and power supply must be protected against interruption of service by explosion, fire, flood, earthquake, rodents, insects, windstorm, freezing, vandalism and other adverse conditions. In a high-rise building, the room has at least 2-hour fire-rated construction or stands 15.3 m (50 ft) away from the protected building.

In other buildings and in a separate pump house, the latest edition ties the separation to sprinklers: with the room and the exposing building fully sprinklered, 1-hour fire-rated construction or 15.3 m; if the exposing building is not sprinklered, 2 hours or 15.3 m. The room itself is sprinklered, as Extra Hazard Group 2 with a diesel engine or diesel tank and as Ordinary Hazard Group 1 with an electric motor.

Access is also a requirement. The location of the room and the way to it are pre-planned with the fire department. A room not directly accessible from outside is reached through a fire-rated corridor from an enclosed stairway or an exterior exit, and that path has a fire resistance rating no lower than that of the room.

The room is sized for every component needed to operate the fire pump, with clearances between components and between a component and the wall for installation and maintenance, clearance from energized electrical equipment in accordance with NFPA 70, and the pump oriented to the suction piping. An approved or listed heat source keeps the room above 4 °C (40 °F) where required; for a diesel engine, the standard may require a higher temperature.

The room has artificial light and emergency lighting of 32.3 lux (3 ft-candles), unless the authority having jurisdiction recognizes another value, held for at least 2 hours and never connected to an engine-starting battery. It also has ventilation, a floor pitched to drain escaping water away from the pump, driver and controller, and a floor drain discharging to a frost-free location. Couplings and flexible connecting shafts have guards.

Brazilian rules add their own requirements. São Paulo IT 22 requires pumps protected against mechanical damage, weather, chemical agents, fire or moisture and does not accept other machines or motors in the room, except those of water-based fire protection systems and the building’s domestic water pumps. A pump room that is underground or in the manifold area has at least a fixed ladder for access, and the manifold area has a minimum clear height of 1.5 m.

In Goiás, NT 22 sets a minimum clear height of 1.5 m for any pump room. In the Federal District, NT 13 requires, for automatic sprinkler pumps, a pump room with a minimum fire resistance of 2 hours when it is not an isolated risk and sprinkler protection when the pumps are driven by diesel engines.

3. What goes inside: the set layout

In São Paulo, IT 22 calls for a centrifugal fire pump, electric or engine-driven, used only for that purpose. Main pumps are directly coupled through a flexible coupling, without belts or chains, with a shut-off valve upstream and a check valve and a shut-off valve downstream. The standby pump follows the state rule: in Goiás, NT 22 requires main and standby fixed pumps and, for low hazard, accepts the main pump alone with a backup power source.

With more than six hydrant or hose reel outlets, IT 22 requires a pressure-maintenance (jockey) pump, with a maximum flow of 20 L/min and a maximum pressure equal to the main pump’s shutoff pressure; it is waived when the tank is elevated. Pressure switches on an automation manifold start and stop the jockey pump and only start the main pump, which after starting is stopped only by hand, at its own panel, inside the pump room.

IT 22 also requires at least one manual start point in a safe, easily reached location, the pump at full speed in about 30 seconds, a panel with a manual start button and visual and audible signals, and a discharge pressure gauge on the main pump, plus a compound gauge when suction is negative. The power supply is independent of the building’s general supply, and the switches carry the warning “FIRE PUMP SUPPLY – DO NOT SWITCH OFF”.

With a diesel engine, IT 22 requires a fuel tank for at least twice the water supply operating time of each system in the building at full load, over a containment basin of 1.5 times the tank capacity; two battery sets, main and standby, on supports in the pump room, with a dual charger that recharges a battery within 24 hours; a panel in the room; and an exhaust with a silencer, discharged outside the room.

The diesel engine sits in a room that never falls below the minimum temperature recommended by the manufacturer, or it has permanently connected preheating. Cooling is by direct water injection, heat exchanger, radiator or fan, and the combustion air intake has a filter. The set must run at full load for 6 uninterrupted hours at the site without damage.

Outside the room, but in the same system, are the fire water reserve and the fire department connection. In São Paulo, the connection is a column type, on the facade or in a cabinet built into the boundary wall, facing the street at 45° and between 0.60 m and 1.50 m above the property sidewalk; on the public sidewalk only where technical impossibility is proven. Systems above 1,000 L/min have two inlets.

4. Conventional pump room × pre-assembled skid

Compare field assembly and a pre-assembled skid by the supply list, installation activities and responsibilities. The pre-assembled package integrates the pump, drive, panel and interconnections at the factory. The schedule and civil works depend on the project and site conditions.

NFPA 20 treats the packaged assembly as a unit assembled at a packaging facility and shipped whole to the site, and requires it to meet every requirement of the standard, including those for the room and the suction piping. Shipping calls for supports and restraints against damage, and the lifting points are marked. Once the unit is set on its permanent foundation, the suction and discharge piping is inspected, and the unit is anchored and grouted.

The difference lies in the activities included in the supply and the installation interfaces. Agree with the responsible engineer who performs civil works, connections, alignment checks and acceptance tests. Factory pre-assembly does not replace these site checks.

5. IT 22, state rules and the path to approval

In Brazil, the path to approval is set by each state’s Fire Department regulation. In São Paulo, IT 22 sets the conditions for sizing, installation, maintenance, acceptance and handling of hydrant and hose reel systems, and its Annex C gathers the fire pump requirements. IT 23 requires automatic sprinkler pump sets to follow Annex C of IT 22 and NBR 16704.

Other states have their own texts. The Goiás Fire Department NT 22 repeats much of these rules, with differences such as the minimum clear height and the main and standby pumps, and lists NFPA 20 among its references, in an edition earlier than the latest one. Requirements from different states do not combine into a national rule: the design follows the jurisdiction of the site.

Under IT 22, the system’s applicability comes from Table 3, by built area and occupancy, and the installed system matches a report with calculations, sizing and an isometric view of the piping. Every parameter, chart and table used in the design is listed in the report, and referring to another design to justify them is not accepted.

Under NBR 13714, after the piping is flushed, a legally qualified professional performs the acceptance: visual inspection, a hydrostatic tightness test with no leaks, and an operating test covering pressure switches, automatic and manual starts, alarms and pressures at the most unfavorable points.

IT 22 provides in Annex F a sample commissioning and periodic inspection report, in which the responsible engineer attests that the installation conforms and justifies every item not met. NBR 13714 requires the installer to fix, preferably in the pump room, a plate identifying the builder, the installer and the designer, with the project registration numbers.

The system is handled by personnel qualified and trained under IT 17, from the fire brigade or civil firefighters, or by the Fire Department. For pump documents, the IT 23 inspection model asks for the performance curve prepared by the manufacturer before installation and a curve produced in the last 36 months.

6. What is checked before handover and in inspections

The IT 22 Annex F report model shows what is checked on the set: the pump properly installed, the jockey pump where there is one, a compartment protected against fire and without an accumulation of combustible materials, no pump leaks, flow and pressure as in the approved design, pressure gauges and switches working, shut-off valves locked fully open and adequate anchoring. Outside the room, the fire department connection and the tank are checked.

For automatic sprinklers, the IT 23 inspection model adds the pump performance curves, the flow meter and the test header for the annual test, and the alarm panel showing the pump supervision events set out in Annex B of NBR 10897. These lists guide the review; they are not inspection-failure statistics.

After acceptance, maintenance and periodic inspections follow NBR 13714, as recorded in the report model in Annex F of São Paulo IT 22. The maintenance plan is prepared by the designer.

Run the tests under the approved procedure, with qualified staff and control of any impairment, record the results and restore the system to its intended condition. FB Bombas offers three post-sale services: replacement of an installed pump with a complete FB pump, start-up and commissioning, and maintenance contracts for FB equipment. Service format, coverage and parts depend on the contracted supply and are defined in the proposal.