Diesel engine pump structural characteristics and technical parameters

Diesel pumps are widely used in urban water supply, large-scale water conservancy projects, farmland irrigation, drainage, drainage pumping station, power station, mine, industrial water supply system, air conditioning system, fire protection system, shipbuilding industry, but also for oil refining Industry for general use. Now use the graphic way to introduce the diesel pump structural features and technical parameters. Diesel engine pump structure Figure 1 pump body 2 pump cover 3 impeller 4 shaft 5 seal ring 6 shaft sleeve 7 coupling 8 bearing body 9 packing gland 10 - Packing I. Description of Diesel Engine Pump Structure 1. Diesel engine pump has the characteristics of long life, high efficiency, reasonable structure, low operation cost, easy installation and maintenance as compared with other pumps of the same type. Diesel pump inlet and outlet are below the axis of the pump, the horizontal direction and axis into a vertical position, the pump housing. In the open, overhaul without dismantling the water, the discharge pipe and motor (or other prime mover) from the joint Looked to the direction of the pump shaft, the pump is counter-clockwise direction of rotation. 2, Diesel pump main pieces are: pump body, pump cover, impeller, shaft, double suction sealing ring, bushings, bearings and so on. Diesel pump materials for the copper, cast iron, ductile iron, 316 stainless steel, 416; 7 stainless steel, two-way steel, Hastelloy, Monel alloy, titanium alloy and No. 20 and other materials. 3, the pump body and pump cover constitute the studio impeller, in and out of the water flange on the system is equipped with a vacuum gauge and pressure gauge pipe screw holes, the lower part of the water flange into the water pipe screw. Flange according to GB standard production, ISO, DIN, BS or ANSI standard production. 4, impeller hydraulic design using the most advanced CFD technology, thus increasing the hydraulic efficiency of diesel pumps. Impeller after static balance verification, with the sleeve and the sleeve nut on both sides fixed to the shaft, the axial position can be adjusted by the sleeve nut, the axial force of the impeller using the blade symmetrical arrangement to achieve balance, may also There are some residual axial force on the coaxial end of the bearing. 5, diesel pump shaft pump by the two sets of rolling bearings, mounted on both ends of the pump body. Unique bearing body design allows the use of grease or oil lubrication bearings, bearing design life of 100,000 hours or more, can also use double row thrust bearings and sealed bearings. Pump body with double suction seal ring, easy to disassemble and replace. Diesel pumps are driven directly by the motor through a flexible pin coupling or a metal laminating coupling. Driver can also be used internal combustion engine, gas turbine. 6, diesel pump sleeve can use a variety of different materials to prevent shaft corrosion and wear, sleeve can be replaced. Wear ring Replaceable wear ring between the pump body and the impeller to prevent pump body and impeller wear and tear, easy replacement, low maintenance costs, while ensuring clearance and high operating efficiency. 7, diesel pump shaft seal can be used packing seal, but also the use of mechanical seals. Shaft Seal Cooling water can enter the shaft seal chamber through the groove on the open surface of the pump cover, and can also enter the shaft seal chamber through the external cooling water pipe. Maintenance do not need to dismantle the inlet and outlet pipes and motors, easy maintenance.According to user needs, can change the pump structure size. Second, the technical parameters of diesel pumps Imported diameter DN: 100∽1400mm Flow Q: Up to 1800m3 / h Head H: Up to 135m Working pressure P: Up to 2.5MPa Operating temperature T: Up to 135 ° C Extended reading: Pumps and valves Pipe Fittings Exhibition information water Expo Xiamen exhibition of marine equipment Internet + Forum Yiwu Fair 2016 exhibition mold top ten brands of the Internet information industry (Xiamen) Technology Co., Ltd. author: Asian pumps network editor: Yao Xiaoxia (QQ / micro letter:) http: // beng.liuti.cn/ (service hotline:)

Drinking water utilities may have to consider changing disinfectant to improve water quality and meet more stringent disinfection regulations. The objective of this study was to evaluate the response of a full-scale drinking water distribution system to a change in disinfectant from chlorine to chlorine dioxide, in terms of its impact on microbiological stability and disinfection by-product formation. Chlorine dioxide residuals were consistently present above detection limits throughout the distribution system (>0.20 mg/L). Over a study period of 3.5 months, no degradation of bacterial water quality occurred after implementing the new disinfectant. Chlorine dioxide maintained total bacteria (microscopic counts) and heterotrophic plate count levels below 2 x 105 cells/mL and 1000 CFU/mL, respectively. The change in disinfectant from chlorine to chlorine dioxide led to an 85% reduction in trihalomethanes (i.e., from 30 to 5 mg/L) and a 60% reduction in haloacetic acids (i.e., from 20 to 8 mg/L). Chlorine dioxide represents a valuable tool to produce high quality water and is a strong alternative to chlorine for certain distribution systems. Key words: distribution system, chlorine dioxide, drinking water quality, disinfection by-products.

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