Fire Gas Pressurization Equipment

1. Components of the Universal Firefighting Gas-Pressurized Water Supply Equipment: Pressure tank, pressure-stabilizing pump system, gas cylinder system, gas pump, and control system.

2. Pressure Pump System Startup and Operation: Before startup, water is first charged into the pressure tank and system. Once charged to a certain level, the pressure pump is activated to continue feeding water into the system. When the water level in the pressure tank reaches the set upper limit (M1), the pressure pump (two units, one active and one standby) automatically stops. If the pressure is below the system's lower pressure limit P2 (P1 being the upper pressure limit, P2 the lower limit), the gas pump automatically replenishes gas into the tank until the pressure reaches the set upper limit P1, at which point the gas pump stops. This completes one pressure stabilization cycle, maintaining the entire fire protection system at a stable pressure state. When system leakage causes pressure to drop to P2, the magnetic flip-plate level gauge detects a decrease in tank water level. If the water level falls to the set lower limit M2, the pressure stabilization pump system automatically activates to replenish water into the system. Water replenishment continues until the system reaches the set upper limit M1, at which point the pump stops. (If tank pressure becomes excessively high during replenishment—exceeding the set upper pressure limit P1—the electromagnetic valve D2 on the tank top automatically opens to relieve pressure, ensuring water replenishment to the target level.) Conversely, if system pressure falls below the set lower limit, the air pump automatically activates to replenish air into the tank. It continues until the system reaches the upper pressure limit P1, at which point the air pump stops. This cycle repeats to maintain the pressure stabilizing system within the set water level (M1-M2) and pressure (P1-P2) ranges, achieving pressure stabilization.

Firefighting gas-pressurized equipment utilizes a bladder to separate gas and water, requiring only a single initial pressurization for continuous operation. During operation, the pressure-stabilizing pump activates, filling the water chamber and increasing water pressure. This compresses the gas in the air chamber. When the water level drops, the gas in the air chamber expands, causing the diaphragm to contract and force water out of the water chamber. Pump operation is controlled via an electric contact pressure gauge and an electrical control box to achieve the rated pressure. This type of air pressure tank has a relatively large total volume. For example, when the effective volume is 3m³, the total volume is 6.3m³; when the effective volume is 6m³, the total volume reaches 18m³. Due to manufacturing constraints, the maximum effective volume of this diaphragm tank is typically 6–7m³. It can only meet the water demand of buildings with indoor fire hydrants requiring 10L/s, failing to satisfy higher firefighting water volume requirements. Gas-Pressurized Operation and Working Principle: Gas-Pressurized Cylinder System: The cylinder bank comprises N cylinders, each connected via piping to a DN25 pipeline. This pipeline links to the top of the pressure tank, with flow controlled by solenoid valve D1. Cylinder internal pressure ranges from 12MPa to 15MPa (kgf/cm²), while outlet pressure is set below the system's lower limit pressure P4=0.42MPa. The cylinder system remains inactive in standby mode and activates only during fire incidents. Operation proceeds as follows: Upon fire detection, the pressure in the pressure stabilization system drops sharply. When it reaches P4, solenoid valve D1 opens. High-pressure gas from the cylinder bank, combined with high-pressure gas from the air compressor, rapidly injects into the pressure tank. This forces water from the pressure tank into the pipeline, ensuring a 10-minute emergency firefighting water supply. The gas-pressurized equipment fully complies with the design requirements of the “Code for Fire Protection Design of Buildings,” High-Rise Civil Building Fire Protection Code, Automatic Sprinkler System Design Code, and Performance Requirements and Test Methods for Fixed Fire Water Supply Equipment GA30.1-2002. It has been tested by the Ministry of Public Security's National Quality Supervision and Testing Center for Fixed Fire Extinguishing Systems and Fire-Resistant Components, with all performance indicators meeting requirements.