Requirements for the arrangement of pipeline valves in hotel fire hydrant systems and sprinkler systems

I am fire protection expert Alexander Li. In hotel fire protection system design, the piping valve arrangements for hydrant systems and sprinkler systems are key to ensuring syste…

I am fire protection expert Alexander Li. In hotel fire protection system design, the piping valve arrangements for hydrant systems and sprinkler systems are key to ensuring system reliability and maintenance convenience. Improper valve arrangement may lead to failure of system zoning, difficulty in maintenance, and even affect water supply capacity during a fire. The following is a detailed analysis of the relevant requirements based on GB50016 Code for Fire Protection Design of Buildings and GB50261 Code for Construction and Acceptance of Automatic Sprinkler Systems.

1. Piping Valve Arrangement Requirements for Hydrant Systems

According to Article 8.1.5 of GB50016-2014 (2018 Edition) and Article 7.4.7 of GB50974-2014 Technical Code for Fire Water Supply and Hydrant Systems, valve arrangement in hydrant systems shall meet the following core requirements:

Valves on ring networks: Indoor hydrant systems shall be arranged as ring networks, and valves must be installed on the ring network to divide the piping network into several independent sections. The number of hydrants in each independent section should not exceed 5 (Article 8.1.6 of GB50974). This ensures that water supply to other areas is not affected during maintenance.
Maintenance valves: Valves shall be installed at the connections between risers and horizontal pipes, at the bottom of risers, and on system service pipes to facilitate sectional maintenance. Valve types should preferably be outside-screw-and-yoke gate valves or butterfly valves with open/close indication (Article 8.2.5 of GB50974).
Signal valve requirements: For high-rise hotels (building height >50m), valves in hydrant systems should preferably be signal valves, with status feedback to the fire control room to prevent accidental closure (Article 12.3.10 of GB50974).
Test and drain valves: Drain valves shall be installed at the lowest point of the system, and automatic air release valves at the highest point (Article 8.2.6 of GB50974).

Engineering case: In a five-star hotel (building height 80m), the original design of the hydrant ring network had only 2 main valves, so maintenance on the first-floor riser required shutting off the water supply to the entire building. In accordance with the code, we added sectional valves (each section controlling 4 hydrants) and installed maintenance valves at the bottom of each riser. During later maintenance and renovation, only one floor was shut down, greatly improving maintenance efficiency.

2. Piping Valve Arrangement Requirements for Sprinkler Systems

According to Article 8.0.3 of GB50084-2017 Code for Design of Automatic Sprinkler Systems and Article 5.1.8 of GB50261-2017, the following points shall be noted for valve arrangement in sprinkler systems:

Alarm valve assembly valves: The number of sprinklers controlled by each alarm valve assembly should not exceed 800 (wet systems), and each alarm valve assembly shall be provided with a main control valve (signal valve or valve with locking device), installed before the inlet of the alarm valve (Article 6.2.3 of GB50084).
Zoning valves: Signal valves and pressure gauges shall be installed at the inlet of distribution pipes, on each floor or in each fire compartment (Article 8.0.7 of GB50084). Signal valves must be interlocked with the automatic fire alarm system to ensure an alarm is raised when closed.
End test valve requirements: An end water test device shall be installed at the most unfavorable sprinkler corresponding to each alarm valve assembly, including a test valve, pressure gauge and drainage facilities (Article 6.5.1 of GB50084).
Drain and vent valves: Drain valves shall be installed at the lowest point of the system, and automatic air release valves at the highest point (Article 5.2.10 of GB50261). For dry or pre-action systems, quick air release valves shall also be installed at the end of the piping.

Engineering case: In a hotel sprinkler system, because no signal valve was installed at the inlet of the distribution pipe, workers accidentally closed the zoning valve during maintenance, resulting in no water in that area during a fire. In accordance with Article 8.0.7 of GB50084, we added signal valves at the inlet of the distribution main on each floor and connected them to fire control room monitoring. At the same time, valves with locking devices were added before the alarm valve assemblies to prevent misoperation.

3. General Requirements for Valve Selection and Installation

Valve types: Valves for fire protection piping should preferably be outside-screw-and-yoke gate valves or butterfly valves, but butterfly valves must have open/close indication (Article 8.2.5 of GB50974). Signal valves must be normally open and feed back signals to the fire control room.
Installation spacing: Valve installation positions shall be convenient for operation and maintenance, and the distance from the valve handwheel to the wall should not be less than 200mm (Article 5.1.13 of GB50261).
Pressure rating: The nominal pressure of valves shall not be lower than the system working pressure (usually ≥1.6MPa), and they must pass fire protection certification (such as 3C certification).

Concluding Summary

Valve arrangement in hotel hydrant and sprinkler systems must follow the principles of ring network sectionalization, maintenance valve zoning, and signal valve monitoring to ensure system reliability and maintenance convenience. Specifically, it is necessary to combine GB50974, GB50084 and other codes to clearly define valve locations, types and interlock requirements in the design, so as to avoid system failure caused by improper valve arrangement.

The above are reference opinions. The actual project conditions still need to be further evaluated and implemented in combination with specific operating conditions, site conditions and other factors.

Engineering reference only — verify against project conditions and the latest codes.

Requirements for the arrangement of pipeline valves in hotel fire hydrant systems and sprinkler systems