Gear pump selection
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Question: I need to select a gear pump for use with media C5 and C9. The density of these media is 760 kg/m3, their viscosity is 0.371 CP, the flow rate required is 10–15 m3/h, the head required is 30 m, the self-priming height is 2 m. The pump should have an explosion protection rating of DⅡBT4 and a protection grade of IP55. Could someone please explain the specific steps and criteria for making this selection? Thank you! I’m a newbie, please forgive me!
This post was last edited by FLYTOINTER on 2010-7-9 23:47. First of all, I’m not sure what materials C5 and C9 are made of. Knows about C6 material. Second, when selecting a pump, pay attention to the following issues: 1. If the viscosity of the fluid is low, the backflow rate using a gear pump increases, and the lubrication effect within the pump is poor. In such cases, the idler wheel, shaft sleeves, and mechanical seals of the pump should be made of self-lubricating materials; carbon graphite can be used for the shaft sleeves. Be careful not to choose a too high speed for the pump. 2. There are no issues with the head, flow rate, self-priming height, or the explosion-proof motor. Please take a look at the curve: pump speed is 570 RPM. The lnx version is an agent for rotor pumps; they are very experienced in this field and provide highly professional responses. The flow rate specified by the poster is a range; I boldly guess that flow regulation might be necessary. I have indeed seen situations where, with low-viscosity media, gear pumps can maintain a constant back pressure while allowing for adjustable flow rates – a requirement that cannot be met by self-priming centrifugal pumps.
Reply 2# lxn_663 C5 and C9 are intermediates; pentane and nonane
What are the material properties of this C5.C9? Corrosive?
This post was last edited by FLYTOINTER on 2010-7-9 at 23:47. The viscosity of the medium to be transported, as mentioned by the original poster, is quite low; using a gear pump would result in internal leakage (gear pumps are commonly used for high-viscosity media, but this doesn’t mean they can’t be used for low-viscosity media either – as long as the right materials are chosen, gear pumps can be utilized, according to flytointer). It is recommended to use a centrifugal pump for transportation (since the original poster requires self-priming capability, and ordinary centrifugal pumps cannot meet this requirement, per flytointer)