(1) easy to manage, but bulky; (2) more expensive; (3) requires a large area; vertical pumps,
(4) In many cases the impeller is submerged in water; (5) It can be started at any time; (6) It is compact;
(7) to facilitate automatic ç› or remote control; (8) small installation area; (9) the price is cheaper.
3, according to the nature of the liquid medium to determine the water pump, hot water pump also pump, chemical pump or corrosion-resistant pump or impurity pump, or not blocked pump.
4, installed in the explosive area of ​​the pump, explosion area should be based on the level of explosion-proof motor.
5, the choice of far motivation: Pneumatic, electric (electric divided into 220v voltage and 380v voltage).
6, according to the size of the flow, the suction pump or double-suction menu pump: According to the level of head, pump suction or suction pump more, high speed pump or low speed pump (air conditioning pump), multi-stage pump efficiency than single- Pumps and multi-stage pump can also be used when the same, should choose a single-stage pump.
7, to determine the specific type of pump, the pump used in what series of options, you can press the maximum flow, enlarge the 5% - 10% head of the remaining capacity of these two main performance parameters in the spectrogram or series of characteristic curve Determine the specific model.
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 lines from the two values, respectively, and the intersection of the two lines falls exactly on the characteristic curve. The pump is the pump of choice, but the ideal situation is usually not very few, usually run into the following situations:
(1) The first: the intersection point in the characteristic curve above, indicating that the flow to meet the requirements, but the lift is not enough, this time, if the lift is about the same, or a difference of about 5%, can still be used, if the lift a lot of difference, Big pump. Or try to reduce the pipeline resistance loss.
(2) The second: the intersection point below the characteristic curve, in the fan characteristic trapezoidal trapezoidal range, initially set this model, and then according to how much the head difference, to decide whether to cut the impeller diameter, if the difference is small head, not Cutting, if the difference is very large head, according to the required Q, H, according to its ns and cutting formula, cut the impeller diameter, if the intersection does not fall within the range of fan-shaped trapezoidal, should choose a smaller lift pump.
Pump selection, and sometimes have to consider the production process requirements, choose different shape QH characteristic curve.
â‘ If you want to send the liquid level must be maintained to a certain level of container to go; â‘¡ at this time thinning
③ hope that the amount of large changes; ④ small change in head; ⑤ should be used for the second smooth HO curve pump.
⑥ like oil sent to the tube furnace to go; ⑦ small changes in the flow of work,
⑧ furnace tube is easy to produce coke phenomenon. To avoid this situation; ⑨ hope but a slight decrease in traffic,
â‘© pipe oil pressure has increased greatly; just to be formed scorch was washed away by higher flow pressure, this time,
Should choose QH curves more sub-drop pump;
8, after the pump model is determined, the pump or transport medium near the water of the physicochemical pump, need to go to the relevant product catalogs or samples, according to the model performance chart or performance curve correction to see whether the normal working point falls on the Pump priority work area? The effective NPSH is greater than (NPSH). Can also be reversed in order to NPSH geometric installation height?
9, for the delivery of liquid pump viscosity greater than 20mm2 / s, we must take the water pump performance curve is converted into the performance curve of the viscosity, in particular, to the performance such as suction or earnestly calculated nuclear.
10, to determine the number of pumps and spare rate:
The normal operation of the pump, generally only one, because a large pump and parallel work of two small pumps, (referring to the head, the same flow), the pump efficiency is higher than the small pump, so from the point of view of energy-saving options rather Ning Taiwan big pump, rather than two small pumps, but in the case of the following circumstances, consider the two pumps in parallel cooperation:
1), a large flow, a pump can not reach this flow.
2) For large pumps requiring a 50% standby rate, two smaller pumps can be changed to work with two spares (total of three). For some large pumps, a pump with 70% of the flow rate can be used in parallel without using Standby pump, pump maintenance in one, the other lift the pump still bear the production of 70% of the delivery. For 24-hour continuous operation of the pump, spare pump should be three, running, a spare, a maintenance
More keyword search: AY pump
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