Are magnetic drive pumps suitable for large medium-pressure boiler feed water pumps?
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This post was last edited by chuan21206 on 2022-6-2 08:34. In my project, there is a medium-pressure boiler feed pump that needs to be replaced; the parameters are as follows: rated flow rate of 185 m3/h, head of 566 m, inlet pressure of 0.35 MPa, outlet pressure of 6.0 MPa, and the temperature of the fluid is around 139 degrees Celsius. Some people recommend considering magnetic pump. Based on experience, it seems not very reliable, such as demagnetization due to high temperatures and bearing cooling. Which specific parameters do not apply to this operating condition? I hope senior brothers and sisters can give me some guidance. Thank you!
I can’t understand why magnetic pumps are used for boiler feed water pumps. Boiler feed water pumps are already well-developed technologies; is there really such a strong need for leak-free operation? In addition to the advantage of being leak-free, magnetic pumps have many other disadvantages, such as difficulties in increasing their power output and magnetic field degradation over time. Shielded pumps are another option to consider
Write down the application conditions for magnetic pumps and something like that, give it to your supervisor; if he agrees, then go ahead with it
This post was last edited by chuan21206 on 2022-6-2 08:38. Ah, it’s all so heartbreaking; this issue has been bothering me for weeks. I’m looking for a reason that can completely refute the claim that magnetic pumps are not suitable for use in medium-pressure boiler feedwater, and that’s why I’m seeking help. Things like high-temperature demagnetization, the fact that magnetic drive pumps are not suitable for large multi-stage centrifugal pumps, and the fact that multi-stage boiler feed pump technology is already well-developed – all of these have been mentioned already.
Talk about the price and scare your boss away.
How much is such a pump estimated to cost?
What considerations lead to the choice of a magnetic pump?
As a front-line salesperson from the manufacturer, I can tell you that for regular models, your flow rate requirements can be met, but a magnetic pump with a head of 566 meters is not capable of reaching such a height. Of course it’s possible, but it requires special customization; the cost of remolding is too high and the profits too low, so manufacturers won’t do it. The medium temperature is 139 degrees Celsius; ordinary neodymium-iron-boron magnets won’t work – samarium-cobalt magnets are necessary. The price of cobalt for clothing is insanely high. In summary, the magnetic pump truly does not meet the operational requirements.
A magnetic pump can be used, but its motor efficiency is lower than that of multi-stage centrifugal pumps, making it uneconomical
This post was last edited by leo_0088 on 2022-6-6 08:51. Can magnetic pumps achieve such a high range? Why choose a magnetic pump? It’s okay if there’s a leak in the boiler feed water, right? We use self-balancing multi-stage centrifugal pumps, and their mechanical seals are of good quality.