Fire water supplied by most firefighting water sources needs a fire pump to pressurize it to meet the water pressure and water requirements for fire fighting. Pump because of setting, improper maintenance failure will inevitably affect the fire and rescue, causing unnecessary losses. Fire pump and paste pump and the production pump should have higher performance requirements, but the current norms of our fire pump performance and test requirements did not make a more specific special delineation, resulting in the selection of fire pump without any traceable , Raised a variety of topics. The performance requirements of the fire pump in the United States are as follows: The maximum flow of the fire pump should be 150% of the designed value, the lift should be not less than 65% of the lift of the selected working point, the lift of the closed pump should not exceed 140% of the selected working point, Regulator pump flow of 1-2L / S, head for the fire pump head 1.1-1.2 times. At the same time delineated in the fire pump outlet pipe should be set to measure the flow meter, the flow meter should be able to test the pump selected flow of 175%, fire pump in the outlet pipe diameter should be greater than 89mm pressure gauge. Suggest off the relevant part of the reference to the United States on China's fire pump design, selection of more targeted and more specific requirements, in order to fire pump selection, testing is well documented. The function of the fire pump delineated as follows: Pump out of the flow rate of 150% of the selected operating point, the lift is not less than 65% of the head of the selected operating point, closed the pump lift is not greater than the selected operating point 140% of head. In fact, it is a delineation of the pump performance curve is a smooth curve. China's standard fire pump without a specific delineation, resulting in the selection of fire pumps have a lot of discrepancies. It is recommended that design staff refer to the delineation of NFPA20 at design time. "High regulation" and "built rules" on the fire pump performance test requirements, NFPA20 designated fire pump in the outlet pipe with a measuring flow meter. The flow meter should be able to test 175% of the selected flow of the pump. The fire pump should be equipped with a pressure gauge with a diameter of more than 89mm on the outlet pipe. After the pump is installed, the pump performance can be fully tested in order to know whether it meets the design requirements. Design staff are advised to consider this topic in their design. Fire water supply system voltage regulator is usually to maintain pressure on the pump, the system plays a guardianship and the system has the function of automatic control. The pressure of the pump can be determined according to the system pressure. The pressure of the pump can be determined according to the system pressure. The pressure of the pump is higher than that of the main pump by 0.1Mpa-0.2Mpa, or the pressure of the pump is the main pump 1.1 times -1.2 times. But for the regulation of pump flow to have a different view. "High regulation" section 7.4.8 supercharger measures shall comply with the following provisions: The fire hydrant water supply system should not exceed 5L / S; Automatic sprinkler system should not exceed 1L / S. The flow of the Pressure Maintenan Pumps / Jocey Pumps / Make-Up Pumps regulated by the NFPA 20 Standand for the Installation of Centrifugal Fire Pumps (1996 Edition) is not less than the normal system leakage and pressure Can be enough to maintain the system pressure. Obviously, China has delineated the upper limit of the pump flow, while the United States has delineated the lower limit of the pump. Our country's pressure regulating pump flow setting requirements are to meet the water consumption of a fire unit, the United States system of leakage. Sprinkler pipe leakage according to national "Heating and Sanitation Engineering Construction and Acceptance Code," Article 3.15 provides: hydraulic test, the pressure drop within 10min is not greater than 0.05Mpa. Then the test pressure dropped to target = _blank> working pressure for visual inspection, to not leak as qualified. "Automatic Sprinkler System Construction and Acceptance Code" section 6.2.3 of the hydrostatic test test points should be set at the lowest point of the system pipe network, the pipe network irrigation, the net should be drained of air and Should be slowly boiled to reach the test pressure, the regulator 30min, visual pipe network without leakage, no deformation, and the pressure drop is not greater than 0.05Mpa. "Water supply and drainage pipe project construction and acceptance of" GB50268-97 Section 10.2.13 provides: DN100 steel pipe allowable water seepage is 0.28L (min? Km), DN150 steel pipe allowable water seepage 0.3L (min? Km) . Obviously, if pipeline construction meets the national standard, there will be little leakage of water in the system pipe network. The author himself has observed two completed projects. Leakage of indoor pipes is mainly caused by capillary seepage of water at the pipe interface and leakage of test drain valves and pump outlet check valves with one end exposed to the atmosphere. Pipeline capillary leakage at the interface generally can not form a drop of water, and more in the air evaporation. One end of the valve in contact with the atmosphere leakage is easy to observe, promptly closed or replace the valve will not be a problem. Pump outlet check valve because of lax and back to the pool back to the water, this phenomenon is not easy to observe, is a major hidden pipe network leak water. For example, a project selected pump flow of 1.33L / S, the pump also failed to run a long time the set pressure, check the pump outlet check valve is not strict and leak to the pool, replace the check valve After the regulator pump work, and start a few days. This shows that the amount of system leakage is very small, almost negligible. According to the survey, the flow of pressure stabilizing pump at home and abroad was selected as 0.5L / S-2.0L / S. When there was no pressure tank in the system, the pump was stopped and there was a water hammer phenomenon. In view of the regulator pump system has the guardianship and automatic control requirements. We recommend that the regulator pump flow 1.0L / S-2.0L / S, the pressure is higher than the main pump 0.1Mpa-2.0Mpa or 1.1 times the main pump -1.2 times. Regulator pump is best equipped with pressure tank, if there is no pressure tank, pump controller should make an issue, so that when the pump is not stopped due to water.
Welded Wire Mesh Rolls
Welded WIRE MESH Rolls: Welded wire mesh rolls are flexible rolls of wire mesh that are made by welding steel wires together at their intersections. They come in various widths and lengths and are commonly used for a wide range of applications, including fencing, animal enclosures, garden protection, and reinforcement in concrete. Welded wire mesh rolls offer strength, durability, and ease of installation, making them a popular choice for both residential and commercial projects.
Hot-Dip Galvanized Welded Wire Mesh: Hot-dip galvanized welded wire mesh is a type of welded wire mesh that has undergone a galvanizing process. In this process, the mesh is immersed in a bath of molten zinc, which forms a protective coating on the surface of the wires. The zinc coating provides excellent corrosion resistance, making hot-dip galvanized welded wire mesh suitable for outdoor applications where exposure to moisture and harsh environments is expected. It is commonly used for fencing, construction, and industrial purposes.
Hot-Dip Zinc Welded Wire Mesh: Hot-dip zinc welded wire mesh is another term used for hot-dip galvanized welded wire mesh. It refers to the same type of mesh that has been galvanized through the hot-dip process, resulting in a protective zinc coating. The zinc coating helps prevent rust and corrosion, ensuring the long-term durability of the wire mesh. Hot-dip zinc welded wire mesh is widely used for various applications, including fencing, animal enclosures, and reinforcement in concrete structures.
Hot Dip Galvanized Iron Wire Mesh: Hot-dip galvanized iron wire mesh is a type of wire mesh that is made from galvanized iron wires and has undergone the hot-dip galvanizing process. The iron wires are immersed in molten zinc, resulting in a protective zinc coating on the surface. This coating provides excellent corrosion resistance, making hot-dip galvanized iron wire mesh suitable for outdoor applications, especially in environments where rust and corrosion are concerns. It is commonly used for fencing, agriculture, and industrial purposes.
These different types of wire mesh, including welded wire mesh rolls, hot-dip galvanized welded wire mesh, hot-dip zinc welded wire mesh, and hot-dip galvanized iron wire mesh, offer varying levels of corrosion resistance and durability. The specific choice depends on the intended application, environmental factors, and the level of protection required.
Welded Wire Mesh Rolls,Hot-Dip Galvanized Welded Wire Mesh,Hot -Dip Zinc Welded Wire Mesh,Hot Dip Galvanized Iron Wire Mesh
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