1. What NBR 13714 is and when it applies
ABNT NBR 13714 — Hydrant and hose station systems for fire fighting — is the standard governing manual water-based fire fighting in Brazilian buildings: the fixed piping network feeding hydrants and hose stations distributed across the floors, supplied by the fire water reserve and, in most designs, pressurized by a pump set.
It applies to the vast majority of buildings requiring the Brazilian fire department certificate (AVCB) — residential and commercial condominiums, warehouses, industrial plants, schools, hospitals and malls. Whether a building needs a hydrant system, and of which type, is defined by the state Fire Department Technical Instruction, which uses NBR 13714 as the design reference. In practice the designer works with both: the state instruction says "what" and the standard says "how".
It is important to separate the roles within the fire standard family: NBR 13714 covers hydrants and hose stations (manual fighting), NBR 10897 covers automatic sprinklers, and NBR 16704 — together with NFPA 20 — covers the stationary pumps that pressurize these systems. The same development frequently needs all three.
2. The three system types: hose station or hydrant, according to risk
The standard classifies systems into three types, in increasing order of capacity. Type 1 is the hose station system: outlets with a semi-rigid hose already connected and an adjustable nozzle, designed to be operated by any building occupant without training — first response in the initial minutes. Types 2 and 3 are hydrant systems, with attachable fire hoses and higher flows, intended for trained brigades and the Fire Department itself; type 3 is the most demanding, used in higher-risk occupancies.
Each type has minimum flow and pressure defined in Table 1 of the standard, verified at the two hydraulically most unfavorable outlets operating simultaneously — typically the highest and farthest from the pump. It is this worst-case condition, not the system average, that sizes the fire pump: it must deliver the design flow at the minimum required pressure at the hardest point of the network.
3. Components: reserve, network, cabinets and the fire department connection
A complete NBR 13714 system has five blocks. The fire water reserve (RTI) is the water volume exclusive to fire fighting, kept in its own tank or in a dedicated compartment of the building tank — the minimum volume follows from the system type and the state instruction. The piping network is exclusive to fire fighting and cannot be shared with building consumption. Hydrants and hose stations are the outlet points, installed in signposted cabinets with hoses, nozzles and wrenches.
The fourth block is the fire department connection (in Brazil, "registro de recalque"): the connection installed at the sidewalk, next to the building entrance, allowing the Fire Department to inject water from the truck directly into the building hydrant network. It is a classic inspection requirement — it must be signposted, accessible, with an identified cap and facing the public road.
Mind the vocabulary: this sidewalk connection is not a pump; what pressurizes the network day to day is the fifth block, the fire pump set.
- Fire water reserve (RTI) — exclusive volume, sized by system type and state instruction
- Dedicated piping network — independent from the building consumption network
- Hydrants and hose stations in signposted cabinets — with hoses, nozzles and wrenches
- Fire department connection at the sidewalk — for the fire truck
- Fire pump set — main, standby and jockey, per NBR 16704/NFPA 20
4. The role of the fire pump in the hydrant system
NBR 13714 allows gravity-pressurized systems when the elevated tank is high enough to guarantee the minimum pressure at the most unfavorable outlet. In practice this is rare: most buildings do not have enough water column, and pressure must come from a dedicated pump set — the main fire pump, the standby pump and the jockey pressure-maintenance pump.
The sizing of that pump is not in NBR 13714 — it is in NBR 16704 and NFPA 20. NBR 13714 delivers the input data: the design flow (the two most unfavorable outlets of the chosen system type operating simultaneously) and the minimum pressure required at them.
With that data, geometric height and network friction losses are added, and a pump is selected whose characteristic curve meets the NFPA 20 envelope — 100% flow at 100% pressure, 150% flow at minimum 65% pressure, shutoff capped at 140%.
In buildings that also have sprinklers (NBR 10897), the pump set is usually sized for the combined demand defined in the design — which is exactly why fire pump specification must start from the demand standards data (13714 and 10897), never from the catalog. FB Bombas uses the FBCN series as the base of its FBFS systems and delivers the complete skid set: electric main, diesel standby when required, jockey, panel and documented bench test for the fire department certificate.
5. Maintenance, inspection and the fire certificate: the system must keep working
NBR 13714 does not end at installation: it requires the system to be kept operational throughout the building life. That means unobstructed hydrants, hoses within test validity, complete cabinets, accessible fire department connection, reserve at level and — the most neglected point — the pump set starting at correct setpoints, with documented periodic testing.
At certificate renewal, the inspector tests the hydrant system in practice — and the most common pump-related rejection cause is simple: a pump that does not start automatically on pressure drop, a jockey with the wrong setpoint or a panel left in manual mode. Keeping an active maintenance contract and test records is the legal responsibility of the building manager, with consolidated case law in Brazil.
6. Common specification mistakes in hydrant systems
Four mistakes repeat in the designs that reach application engineering. First: sizing the pump for the average outlet instead of the two most unfavorable simultaneous outlets — the system passes on paper and fails at the top-floor hydrant. Second: ignoring the state instruction and classifying the system type on one’s own. Third: forgetting the jockey pump, letting the main pump start at every micro-leak.
Fourth: buying the pump before the hydraulic design, from the catalog — when the friction loss calculation is done, the purchased pump does not meet the duty point.
The way to avoid all of them is the same: start from the state instruction risk classification, extract the design demand from NBR 13714, calculate the network and only then specify the pump set per NBR 16704/NFPA 20. FB Bombas application engineering runs this complete path from the building data and returns the skid specification within 48-72 business hours.
