LQB insulation asphalt pump selection of general procedures and the need to consider several factors: LQB insulation asphalt pump selection of general procedures and several factors need to be considered 1, according to the device layout, topography, water conditions, Operating conditions, economic programs and many other factors 2, consider the choice of horizontal, vertical and other types (right angle, vertical, vertical, liquid type, self-suction, gear type). Horizontal pump disassembly and assembly convenience, 3, easy to manage, but bulky, 4, the price is more expensive, 5, need a large footprint; vertical pump, 6, in many cases the impeller submerged in water, 7, Start, 8, for automatic ç› or remote control, 9, and compact, 10, small installation area, 11, cheaper prices. 12, installed in the explosive area of ​​the pump, explosion area should be based on the level of explosion-proof motor. 13, the vibration is divided into: pneumatic, electric (electric divided into 220v voltage and 380v voltage). Botou City Taibang Valve Manufacturing Co., Ltd. 14, according to the size of the flow, the suction pump or double-suction pump menu: According to the level of high or low suction pump suction pump, high-speed pump or low-speed pump (air conditioning pump) Multistage pump efficiency lower than single-stage pump, when elected single-stage pump and multistage pump can also be used when the same, should use a single-stage pump. 15, to determine the specific model of LQB insulation asphalt pump, using what series of pump selection, you can press the maximum flow, amplification of 5% - 10% head lift after the two main performance parameters in the spectrum or series Determine the specific model on the characteristic curve. Use the pump characteristic curve to find the desired flow value on the abscissa and the desired lift value on the ordinate. Draw the vertical or horizontal line from the two values, respectively, right and left, and the intersection point of the two lines falls exactly on the characteristic curve. The pump is to be selected pump, but this ideal situation generally not rare, usually encounter the following situations: A, the first: the intersection point in the characteristic curve above, indicating that the flow to meet the requirements, but not enough head, At this point, if the lift is about the same, or a difference of about 5%, can still be used, if a lot of head difference, then choose a larger head pump. Or try to reduce the pipeline resistance loss. B, the second: the intersection of the curve below the characteristic curve in the fan characteristic trapezoidal trapezoidal range, the initial set under this model, and then according to how much head difference to decide whether to cut the impeller diameter, if the difference is small head, it does not cut , If the head is very different, according to the required Q, H, according to its ns and cutting formula, cutting impeller diameter, if the intersection does not fall within the range of fan-shaped trapezoidal, should choose a smaller pump head. 16, pump selection, and sometimes have to consider the production process requirements, use different shapes QH characteristic curve. A, such as: to the level of liquid must be maintained to a certain level of container to go, B, this time thinning C, the amount expected to have a greater change, and D, lift change is small, E, times should be Use a flat HO curve pump. F, such as: the oil sent to the tube furnace to go, G, if the flow changes in the work small, H, the tube is easy to produce coking phenomenon. To avoid this situation, I hope, but the traffic flow slightly reduced, J, tube oil pressure has increased greatly, K, just to be formed scorch was washed away by higher flow pressure, L, at this time, M, should choose QH curves more sub-drop pump. 17, LQB insulation asphalt pump model is determined, the pump or the transmission medium of the physical and chemical medium water pump, then to the relevant product catalog or sample, according to the model performance chart or performance curve correction to see whether the normal working point is Fall in this pump priority work area? Whether effective NPSH is greater than (NPSH). Can also be reversed to NPSH geometry correction installation height? 18, for the delivery of liquid viscosity greater than 20mm2 / s, must be the experimental curve of water pump performance curve into the viscosity, in particular, should be carefully calculated on the suction performance Or more nuclear. 19. Determine the number and reserve rate of LQB insulation asphalt pump: Generally only one pump is used for normal operation, because one large pump and two small pumps working in parallel are equal (referring to the head and the same flow rate), and the large pump efficiency Higher than the small pump, so from the perspective of energy-saving rather choose a large pump rather than two small pumps, but in the following cases, consider the two pumps in parallel cooperation: a large flow, a pump can not reach this flow . For large pumps requiring a 50% standby rate, two smaller pumps can be changed to work with two spares (in total, three pumps). For some large pumps, a pump with a 70% flow rate option can be used in parallel without a backup pump In the case of a pump overhaul, the other pump lift still assumes 70% of the production. (Editor: Xiaoxia QQ:) Recommended reading: 2017 exhibition information
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