Tank pressure foam proportioning device / pressure firefighting foam fire extinguishing system

I. Introduction Executive Standard: GB20031-2005 pressure foam proportioning device is suitable for the storage depot, petrochemical enterprise, oil depot terminals, tankers, drilling platforms, power plants and other large and medium foam fire engineering. The maximum flow range of the ratio of the mixer 8 ~ 200L / s; volume range tank is 300L ~ 25000L (ie 0.3m3 ~ 25m3). According to the installation into mobile, fixed. Fixed according to the internal structure is divided into: with a capsule without a capsule; according to shape structure is divided into: vertical, horizontal. Second, the principle working principle and characteristics of pressure foam proportioning device 1, PHYM capsule tank built by the proportioner package of equipment, steel tank, capsule, into the water system, the fluid lines, check valves, safety valves, control valves, pressure gauges, exhaust systems and piping components. Proportioner can automatically by mixing water and foam liquid. When the pressure of the water through proportioner, part of the water through the "inlet valve" conduit into the tank water chamber, squeezing capsules, because a slight pressure around the nozzle so that the foam liquid through the pipette capsule is extruded mixed with water becomes foam mixture flows through the foam generator or other injection equipment spray foam for fire fighting work. Features: in the tank has a rubber capsule, so that water and foam liquid separated after each use, the tank of water and foam concentrate can be mixed and did not keep the original quality of foam concentrate the same performance, can continue to be used, to avoid waste foam concentrate. 2, the inner tank PHY no capsule package of equipment by proportional mixer, steel tank, into river systems, the fluid lines, check valves, safety valves, control valves, pressure gauges, exhaust systems and piping components. Proportioner can automatically by mixing water and foam liquid. When fire water through proportioner, part of the water through the "inlet valve" conduit into the receptacle cavity, squeeze the bubble liquid, because slight pressure around the nozzle so that the foam liquid is extruded through a pipette mixed with water become foam mixture flows through the air foam generator or other injection equipment spray foam for fire fighting work. Features: No capsule within the tank, when water enters the tank, in direct contact with liquid and foam. After each use, the tank should be full of water and foam liquid to drain the tank walls clean, dry and re-filled with foam liquid and set aside. Loss caused by rupture of the capsule is not present. It applies to energy and metal cans in direct contact with foam concentrate. Third, the pressure and flow range conditions and mixing device supporting the fire pump must be provided within the mixing device performance. Mixing device must be within the specified operating pressure range and flow range, otherwise it will affect the mixing ratio, lower foam quality. Pressure within the specified size mixing device operating pressure range used, depending on the operating pressure and friction loss of the equivalent length of pipe equipped with foam fire extinguishing equipment, and hence, the use of the pipeline system to do the necessary calculations to determine the ratio of the mixing device installation location is appropriate, the selection is appropriate. After four instructions (see PHYM pressure foam proportioning device works Figure) 1, start fire pumps and water pipes under pressure, open the inlet valve 1 and the outlet valve 2 and inlet valve 3. 2, conditioning system outlet valve opening 2 so that pressure gauge shows the rated working pressure foam proportioning device, and stabilize at a certain value. 3, when the pressure inside the tank into the water and the pressure rose to pressure of work, you can open the liquid valve 4, foam concentrate mixed with water and the pressure is automatically adjusted to 6% (or 3%) ratio, and the system output began to bubble mixture. 4, when the liquid supply is stopped, it should turn off the valve 4 (in order to avoid the pressure of water flowing back into the capsule), and then close the other valves, and stop the pump to stop working. 5, the initial infusion of foam concentrate method: ⑴ shut-off valve 6, open valve 8, valve 9, the valve 7. ⑵ open flange cover 5, the bag can be used a hand pump to rubber foam filling liquid ⑶ When the bubble fluid from the overflow valve 7, can be considered liquid has been filled with foam. Valve 7 is closed. 6, test the water, open the valve 8, valve 3, through the pressure of the water, when the exhaust valve 8 to close the spray of water, so the tank is in the standing state. V. Maintenance 1, always check whether the sealing flange covers, each valve actuation is flexible and reliable. 2, filling foam concentrate, keep the tank clean, not with oil or other liquid foam is mixed, should not be mixed with the aging of foam solution used. 3. Do not allow foam concentrate sunlight and stored in temperature is small venue, less contact with air. Where to store more than two years of bubble solution, prior to use sampling, qualified before use. For the failure of the foam concentrate should be updated. And replaced with new foam record date. 4. The tank is equipped with capsules should conduct a leak test every six months. Test method is to open the drain valve 9, if there is a bubble fluid leak, then prove detrimental capsules should be repaired or replaced. 5, the replacement foam concentrate, deal with the fire extinguishing system for a bubble jet simulation test to check the fire pump, proportional mixing device and foam generator and other equipment operating conditions are normal and reliable, if an exception should be timely maintenance. 6, replace the failed foam liquid, coping means thorough cleansing, cleaning the capsule method is: ⑴ first put in to make the capsule remaining foam liquid, then drain valve open water chamber 9, and then release valve from the capsule 7 is turned on compressed air ( Pressure 0.02 ~ 0.1MPa), open the lower part of the tank vent valve 6, the inner capsule Chuijin foam residue. ⑵ shut-off valve 6, open the valve 8 from the liquid inlet 5 to fill the capsule within the capsule surface clean water, then open valve 6, connected to the compressed air out of the water from the valve 7, and continue to use air blown three capsules ten minutes, thoroughly dry the moisture inside the capsule, refillable foam liquid.