Help pump selection
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An aqueous solution of 10% sodium acetate, 5% sodium hydroxide, 1% ammonia, and 3% sodium cyanide has a boiling point of 105 degrees. The working temperature of the pump is about 105 degrees, and the liquid is transported near the boiling point. I want to use a pump to transfer materials to a height of 3 meters and a conveying distance of 30 meters. The lift requirements are not high, the inlet and outlet pipelines are DN25, and the flow rate is 4-5 tons per hour. Hi friends, please help me research and decide which pump is more suitable.
The key to choosing a pump for this situation is to consider the cavitation margin. Measures to improve the anti-cavitation performance of pumps: (1) Reduce the flow velocity at the impeller inlet (2) Use a double-suction impeller (3) Increase the curvature radius of the impeller front cover to reduce local resistance loss. (4) The inlet edge of the blade is appropriately lengthened, that is, extended in the suction direction, and twisted. (5) The first-stage impeller is made of materials with good cavitation resistance, such as stainless steel, aluminum bronze, and phosphor bronze containing nickel and chromium. (6) To reduce the flow loss of the suction pipeline, you can appropriately increase the diameter of the suction pipe, minimize pipeline accessories, such as elbows, valves, etc., and keep the length of the suction pipe as short as possible. (7) Reasonably determine two heights, namely the geometric installation height and the backflow height. (8) Set up a pre-pump to feed water that is boosted by the pre-pump before entering the feed water pump, which increases the effective cavitation margin of the pump and improves the cavitation performance of the feed water pump.: At the same time, the installation height of the deaerator is also greatly reduced. This is a simple and reliable method to prevent cavitation in the feed water pump. (9) Use an inducer (10) Use a double-wing impeller (11) Use a supercavitation pump
Canned pumps and magnetic pumps are sufficient.
Just choose an IH pump. The key is the material selection of the flow-passing parts. Others are basically ignored. Very easy to implement
First, the toxicity of sodium cyanide and other material properties must be taken into consideration, and then the liquid is close to saturation, and the NPSH should be selected based on the layout. Based on the above two points, it is recommended to choose a canned pump, a magnetic pump or a double-casing pump. If you choose a centrifugal pump, you need to pay attention to the selection of mechanical seals. The choice of NPSH is mainly solved through layout. When the layout is limited, consider the method mentioned on the second floor.
By the way, you should also pay attention to the material of the pump.
I personally think it is better to choose a canned pump to prevent leakage.