Requirements for the Installation of Combustible Gas Detection Systems in Hotels
I am fire safety expert Alexander Li. Combustible gas detection systems are critical to hotel fire safety—if a gas leak occurs in areas such as hotel kitchens or boiler rooms, it can easily lead to an explosion or fire, directly threatening lives and property. Based on my engineering experience, many hotels fail to give this system sufficient attention in the initial design, resulting in obstacles during acceptance or hidden risks in operation and maintenance. Below, I will combine code clauses and practical cases to explain in detail the installation requirements for hotel combustible gas detection systems.
First, according to Article 8.4.3 of the Code for Fire Protection Design of Buildings (GB 50016-2014, 2018 edition), combustible gas alarm devices should be installed in locations within buildings where combustible gases or combustible vapors may be emitted. Typical locations in hotels include kitchens using natural gas, boiler rooms, gas water heater rooms, gas meter rooms, etc. Detectors must be installed in these areas and interlocked with emergency shut-off valves and exhaust fans.
Second, according to Articles 8.1.1 to 8.2.7 of the Code for Design of Automatic Fire Alarm Systems (GB 50116-2013), the installation of combustible gas detectors should follow these key points:
1. **Type of gas detected**: Detectors for natural gas (mainly composed of methane) should be installed within 0.3 m of the ceiling because methane is less dense than air; detectors for liquefied petroleum gas (denser than air) should be installed within 0.3 m of the floor.
2. **Installation spacing**: The protection radius of a detector should preferably not exceed 7.5 m, and in kitchens, a detector should preferably be installed independently above each gas stove.
3. **Interlock control**: After a detector alarms, the gas valve should be automatically shut off and the exhaust fan started. According to Article 10.4.3 of the Code for Design of City Gas Engineering (GB 50028-2006), gas leakage alarm shut-off devices should be installed in kitchens.
4. **Alarm signals**: Combustible gas alarm signals should be connected to the fire control room and sound and light alarms should be issued.
Practical engineering case: I participated in a renovation project for a five-star hotel. Its kitchen had an area of about 80 ㎡. The original design installed only one detector above the stove and did not consider the space below the exhaust hood. During acceptance, experts pointed out that, according to Article 8.2.2 of GB 50116, detectors should avoid vents and locations directly impacted by steam, and must cover all gas equipment. We then adjusted the plan: adding two detectors within 0.3 m above the stoves and installing interlocked shut-off valves and explosion-proof exhaust fans. After rectification, the system response time was <10 seconds and it passed acceptance smoothly.
In addition, during the operation and maintenance stage, attention should be paid to the following: hotels should entrust a qualified unit every year to calibrate the detectors (according to Combustible Gas Detectors GB 15322-2019) to ensure sensitivity meets standards. I once handled a case in a hotel where frequent false alarms occurred because the detectors had not been calibrated regularly, and the problem was ultimately solved only by replacing the sensors.
Summary: Hotel combustible gas detection systems must be installed strictly in accordance with codes, with key attention to detector installation locations, protection coverage, interlock control, and regular maintenance, so as to prevent gas leakage risks.
The above are reference opinions. The actual project situation still needs to be further comprehensively evaluated and implemented in combination with specific operating conditions, site conditions, and other factors.