9Compare items | Vertical 9 piston pump | Horizontal 3 piston pump |
Lubrication form | Water self-lubricating | Oil lubrication of connecting rod |
Cooling method | The water is self-cooled, and the heat is discharged with the high pressure water through the nozzle | The water tank is cooled by water, and the oil tank is not cooled, which will easily cause damage to the seal and seal failure |
Pulse performance | Small pulse, constant pressure | Large pulse, extremely unstable pressure |
Noise level | 85 decibels at a distance of one meter | More than 120 decibels at a distance of one meter |
Basic requirements | The vibration is small, the dynamic load is about 1.2 times of the static load | The vibration is large, the dynamic load is more than 3 times the static load |
Impact on pipe network and equipment | No harm | Great impact on the pipe network and great harm to the pressure sensor |
Maintenance cycle | Maintenance-free | Need to regularly observe whether the lubricating oil leaks |
Service life | Around 8000 hours | 2000-4000 hours |
Shelf life | All materials are wear-resistant and corrosion-resistant materials, which have been in a water environment for a long time | The connecting rod of the pump is lubricated with oil, and it is easy to rust if it is not used for a long time in a water environment; if the pump head is made of copper alloy, it is easy to rust and the sealing performance becomes poor |
Cost | Slightly higher | cheap |
Application comparison of high pressure water mist fire extinguishing system | The pressure is stable, and the number of high-pressure pumps can be started exactly according to actual needs; long life; maintenance-free; low noise | The pressure is unstable, and the number of pumps cannot be started exactly according to the actual needs. All pumps in the pump group must be started, which can easily cause overpressure in the pipe network; it cannot be stored for a long time in a water environment and is easy to rust; check the lubricating oil regularly and regularly Maintenance; high noise; high vibration |