Selection of non-metallic centrifugal pumps for high-temperature media?
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This post was last edited by wxbfljj on 2016-12-15 at 15:41. The minimum operating temperature for the medium is 180 degrees; in such cases, the customer requests the use of fluorinated pipeline pumps. However, the centrifugal pumps made from high-temperature material PFA can currently handle temperatures of up to 160 degrees, and my own customers are using them without any issues at that temperature. The customer suggested placing the entire pump head of the pipeline pump in cold water, with the water covering the seal area to provide continuous cooling. He said that experiments had shown it was not possible to reach such high temperatures. However, I believe his method only cools the outer surface; the temperature of the material inside remains around 170–180 degrees. Moreover, having the inside hot while the outside is cold might cause the interior material to crack. Marine enthusiasts, what are your thoughts? Let’s discuss them. (Note: Don’t suggest using pumps made of other materials; I’ve told the customer that as well, but I really don’t understand why the customer insists on fluoroplastic pumps.) . . . ）
Even though rows are separated, the principle remains the same; plastic has poor heat conductivity, so I don’t think the customer’s method is good
Generally, metal pumps are preferred for high-temperature applications. Plastic delamination and aging are quite severe. PFA has also not been used in our experience, but according to samples and manuals, it is typically resistant up to 150 degrees. I also think there is a risk of delamination with the customer’s method. Plastic has poor thermal conductivity, so the temperature of the material certainly won’t drop. It is necessary to add a flushing cooler at the mechanical seal, but it is of no use. Personally, I think it’s better if you don’t eat this crab.
Yes, I made it clear to him that it’s not possible. Other manufacturers told him it could be used, and I said I could also say it’s possible, but I can’t tell how long that would be possible.
I guess it’s because all-metal versions are too expensive; fluorinated linings are used instead, and corrosivity must be quite high, right? It shouldn’t be made of ordinary metal.
Pumps with fluoroplastic linings suffer from delamination, cracking, and separation between the hub and the fluoroplastic layer – problems that keep arising; it’s better to pay a bit more to avoid frequent repairs in the future
The equipment has been delivered; just let them handle it on their own.
If the customer insists on that, I won’t sell it. . The customer insists on buying it, but I still don’t dare to sell it :) At first, it might not be a problem. If there’s a problem with the equipment, it’s our responsibility. It’s better not to take risks with things that have no foundation.
You won’t be able to avoid the troubles that follow either, until the relationship deteriorates; P
Did he use fluoroplastic pumps quite often before?