1. The four standards governing fire pumps in Brazil
Before selecting the pump, you must understand which standard governs which component of the fire-fighting system. Confusion between standards is the leading cause of projects rejected at Fire Department inspection and of wrong quotations in the bidding phase.
FB Bombas, in over 82 years serving the Brazilian industrial market, observes that half of the projects arriving for technical review have wrong standard citation, and this imprecision is costly: failed inspection means new construction deadline, occupancy permit fine and loss of property insurance.
NFPA 20 (Standard for the Installation of Stationary Pumps for Fire Protection, 2022 edition) is the international reference standard for the PUMP: defines design, installation, maintenance and testing requirements for stationary pumps. NBR 16704 (Stationary pump sets for automatic fire protection systems — Requirements, 2019, corrected version 2020) is the Brazilian-specific PUMP standard, harmonized with NFPA 20 and adapted to Brazilian market conditions (grid voltage, risk classes, integration with state IT).
NBR 10897 (sprinklers) and NBR 13714 (hydrants and hose reels) govern the HYDRAULIC SYSTEMS the pump feeds, not the pump itself. Additionally, each Brazilian state has Fire Department Technical Instructions (IT) defining requirements per occupancy type.
State IT vary significantly between states: São Paulo (IT-22 Hydrant System, IT-23 Automatic Sprinkler System), Rio de Janeiro (RT-04, RT-05), Minas Gerais (IT-15, IT-16) and other states have their own requirements for minimum pressure, startup time, redundancy and documentation. FB Bombas maintains engineering familiar with the IT of major producing states and adapts the technical memorandum to the specific Local Fire Department requirement, avoiding the classic rework of "passed in SP, failed in MG".
2. Technical guides by occupancy type
FB Bombas maintains four technical libraries dedicated to the most frequent occupancy scenarios in Brazilian projects. Each library covers typical flow and pressure requirements of the occupancy, the most suitable driver technology (electric, diesel or both in redundancy), mandatory components (jockey, panel, test valves, bypass) and applicable state IT. The correct entry into the technical funnel depends on which occupancy you are sizing. Each has specific pitfalls that deserve attention in preliminary design phase.
Logistics warehouses concentrate the highest demand for fire systems in new Brazilian projects, and are also where most sizing errors occur. The combination of tall ceiling (12 to 15 m), plastic pallet storage and heterogeneous SKU raises the risk class to Ordinary Hazard Group 2 or Extra Hazard, requiring ESFR or CMSA sprinklers with high flow (4,500 to 9,000 L/min) and moderate pressure.
Electric + diesel redundancy is practically mandatory due to stored cargo criticality and typical isolation of these logistics centers. For shopping malls, hospitals and condominiums, the scenario changes: human occupancy raises the obligation of hydrants (NBR 13714) parallel to sprinklers, and state IT defines higher minimum residual pressure (typically 100 kPa).
In power plants, refineries and fuel terminals, NFPA 20 requires mandatory diesel motor in several scenarios (classified areas, unreliable electrical supply), and the system often includes foam application (NFPA 11) with additional dedicated pumps.
- Logistics warehouses: ESFR or CMSA sprinkler, flow 3,500 to 9,000 L/min, moderate pressure, standard electric/diesel redundancy
- Shopping malls, hospitals and condominiums: light to ordinary sprinkler class, mandatory NBR 13714 hydrants, redundancy and automated supervision
- Power plants, refineries and fuel terminals: tank protection (sprays, NFPA 11 foam), classified-area containment curve, mandatory diesel motor
- Pre-assembled complete skid: plug-and-play solution for tight-deadline projects or sites without dedicated pump house
3. Technical guides by system component
Fire-fighting systems are composed of main pump (electric or diesel), jockey pump (pressurization and pressure maintenance), control panel (NFPA 20 dedicated), test and discharge valves, bypass and instrumentation. Each component has its own standard and sizing; FB Bombas maintains technical libraries specific to the most critical components. The separation between components is not merely didactic: NFPA 20 requires INDIVIDUAL documentation of each (pump datasheet, controller certificate, panel compliance declaration) for Fire Department inspection.
A set supplied by different integrators needs auditable technical coherence.
The main pump with electric motor is the standard configuration for 70 % of buildings in Brazil: requires dedicated NFPA 20 controller (cannot be shared MCC), automatic startup by pressure drop, phase monitoring, connection to primary and secondary power source (typically backup generator).
The main pump with diesel motor is required when NFPA 20 considers the electrical source unreliable (refineries, classified areas, isolated buildings) or when state IT requires redundancy: minimum 8-hour autonomy, dedicated fuel tank sized by pump flow, batteries with automatic charger and solenoid startup. The jockey pump is sized at 1 % of main pump flow (NFPA 20 §A.4.27), with differential setpoints ensuring startup BEFORE the main and stop AFTER network pressure restoration.
Its function is to absorb micro-leaks and prevent the main from cycling unnecessarily, extending the main set service life up to 5 times.
- Main pump with electric motor: NFPA 20 dedicated controller, automatic startup, phase monitoring, connection to primary and secondary power source
- Main pump with diesel motor: minimum 8-hour autonomy, dedicated fuel tank, batteries with automatic charger, solenoid startup
- Jockey pump: sized at 1 % of main pump flow (NFPA 20 §A.4.27), differential setpoints, independent panel, function: keep network pressurized and detect leaks
- Combined sprinkler + hydrant + pressurization systems: three systems, three distinct pumps, sequential startup logic per NFPA 20
4. Decision flow to select the correct technical guide
The choice of starting technical guide depends on the project phase. In conceptual phase (descriptive memorandum, preliminary design), the correct starting point is the occupancy guide: it presents applicable IT, minimum protection levels and expected driver technology. In detailed engineering phase, the starting point is the component guide: it enters dimensional, electrical or fuel specifications, and pump integration. In execution phase, the focus shifts to commissioning and acceptance test guides.
| Project phase | Recommended guide |
|---|---|
| Preliminary / Memorandum | Occupancy guide (warehouse, mall, plant, etc) |
| Pump technical specification | Component guide (electric vs diesel) |
| Pressurization detailing | Jockey pump guide |
| No pump house / tight deadline | Pre-assembled complete skid guide |
| Complex combined system | Sprinkler + hydrant + pressurization guide |
| Flow and pressure calculation / NFPA 20 curve | Article: How to size an NFPA 20 fire pump |
5. Basic sizing: flow, pressure, NPSH and NFPA 20 curve
Sizing an NFPA 20 fire pump follows six mandatory steps: (1) design flow summing sprinkler demand (NBR 10897) + hydrants (NBR 13714) + reserve per risk class; (2) required pressure summing geometric height + friction losses (Hazen-Williams) + minimum pressure at the most remote nozzle; (3) NPSH available at suction verified against pump NPSHr; (4) main pump with characteristic curve certified per NFPA 20 envelope (100 % flow at 100 % pressure / 150 % flow at minimum 65 % pressure / 0 % flow at maximum 140 % pressure); (5) diesel standby pump identical in hydraulics + fuel reserve NBR 16704; (6) jockey pump at 1 % of main pump flow.
Distributed friction loss in fire systems is calculated by Hazen-Williams: Hf = 10.67 × (Q^1.852 / (C^1.852 × D^4.87)) × L. Typical C coefficients: 120 for new carbon steel pipe, 100 for steel with 10 years of use, 130 for CPVC. Minimum nozzle pressure at the most remote point is typically 70 kPa (7 mwc) for conventional sprinklers and 100 kPa (10 mwc) or more for hydrants; always check applicable state IT.
Available NPSH at suction must have minimum 1 m margin over pump NPSHr (Hydraulic Institute), preferably 2 m for critical systems. FB Bombas works with flooded suction as standard for all fire systems.
6. Why a commercial pump does not work in an NFPA 20 system
This is the technical confusion that most disqualifies pumps in Fire Department inspection: buying a generic catalog normalized centrifugal pump and trying to use it in a fire system. NFPA 20 and NBR 16704 do not require only nominal flow and pressure: they require the pump to operate within a rigid characteristic curve envelope, with three operating points validated in individual bench test.
| Aspect | Commercial pump | FBCN NFPA 20 pump |
|---|---|---|
| Characteristic curve | BEP-optimized | NFPA 20 0/100/150 % envelope |
| Bench test | Batch or type | Individual NBR 13414 |
| Construction | Standard back-pull-out optional | Back-pull-out mandatory (maintenance) |
| Casing materials | Standard cast iron | CI / stainless / bronze per NFPA 20 |
| Sealing | Mechanical seal or packing | Balanced mechanical seal standard |
| Documentation | Catalog datasheet | Datasheet + certified curve + signed technical memo |
| Accepted in Fire inspection? | NO | YES |
7. Complete documentation for Fire Department inspection (AVCB)
The AVCB (Fire Department Inspection Certificate, Brazilian equivalent of US fire occupancy permit) is the document that releases the building for use: without it there is no occupancy permit, no property insurance and no operating license. The inspection evaluates the fire-fighting system in its entirety, and a single missing pump document can delay clearance by months. FB Bombas delivers the complete document package as standard scope (no additional cost), prepared for direct attachment to the state Fire Department process.
- Pump + motor set datasheet per NFPA 20 and NBR 16704 with flow, pressure, NPSH, speed and power
- Factory-certified characteristic curve with bench-test-validated points (0 %, 100 %, 150 % rated flow)
- Individual pump test report per NBR 13414 or Hydraulic Institute 14.6 (flow × pressure × efficiency × power)
- Electrical panel compliance declaration with NFPA 20 chapter 10 or NBR 16704 (dedicated controller, phase monitoring)
- Motor certificate (electric IE3 class or diesel with consumption curve) and pump-motor alignment report
- Set technical memorandum signed by FB Bombas responsible engineer (CREA technical responsibility included)
- Installation, operation and maintenance manual in Portuguese + NFPA 25 inspection, testing and maintenance schedule post-commissioning
- Recommended spare parts list for the first 5 years of operation (impeller, mechanical seal, bearings, diesel batteries)
8. Typical schedule: from order to AVCB
The total time between order placement and AVCB release depends on system complexity and motor availability (electric or diesel). As reference, FB Bombas operates with the following average lead times for standard fire pump systems (flow up to 5,000 L/min, pressure up to 100 mwc, electric + diesel + jockey + pre-assembled skid configuration).
| Stage | Lead time | Deliverables |
|---|---|---|
| Application engineering + quote | 24 to 72 business hours | Six-step calculation, selected model, preliminary curve, commercial proposal |
| Dimensional drawing approval | 5 to 10 business days after order | Skid dimensional drawing + pump house + piping interfaces |
| Pump fabrication + skid integration | 8 to 12 weeks (electric) / 12 to 16 weeks (diesel) | Pump fabricated, motor integrated, panel assembled, skid pre-tested |
| Bench test NBR 13414 | Before shipment | Certified curve with 0/100/150 % points, efficiency, power |
| Shipment + transport | 5 to 15 days per BR destination | Delivery on site + technical support for unloading and positioning |
| Commissioning and acceptance test NFPA 20 §14.2 | 2 to 5 days after installation | Flow, pressure and startup time test with FB technician on site |
| Fire Department inspection + AVCB | Per state Fire Department schedule | Complete documentation attached to process + FB technical support if needed |
9. Most common errors in fire projects
In over 82 years serving the Brazilian industrial market, FB Bombas has mapped the recurring errors that appear in fire-fighting projects, both new construction and retrofit. Knowing these errors before closing the project avoids construction rework, AVCB delay and financial loss. The 10 most frequent:
- Specifying standard commercial pump without NFPA 20 curve: automatic disqualification in inspection
- Under-sizing flow using average instead of simultaneous demand required by risk class
- Forgetting Y-strainer friction loss at suction (K = 2 to 5), which drops NPSHa by up to 1.5 m
- Eliminating the jockey pump "to save money": destroys main pump service life and violates NFPA 20
- Using shared MCC electrical panel instead of dedicated NFPA 20 controller: disqualification
- Diesel fuel tank under-sized for autonomy required by NBR 16704 risk class
- Drawn suction (above water level): violates NFPA 20 which requires flooded suction for centrifugal pumps
- Missing pump-motor alignment report on delivery: Fire Department may require it before clearance
- Not considering the municipality-specific state IT in the technical memorandum (assuming IT-SP works in MG or RJ)
- Skipping NFPA 20 §14.2 acceptance test: system without documented test may be disqualified in inspection
