Selection of ethylene glycol pump
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The dielectric fluid is ethylene glycol, and the temperature is -15 degrees Celsius. What kind of pump would be suitable? Are there any special requirements for the pump?
A regular centrifugal pump of type ZA will suffice; there are no special requirements. The temperature isn’t very low either, so material 304 will work, and 20Cr13 can be used for the shaft
Ethylene glycol is colorless, odorless, and toxic; in my opinion, it’s best to use a pump without a seal, such as a stainless steel magnetic pump. Keep in mind that even ordinary centrifugal pumps, when equipped with mechanical seals, still experience some leakage.
Both ordinary stainless steel centrifugal pumps and stainless steel magnetic pumps were mentioned; it is estimated that both can be used. Magnetic pumps do not leak, making them safe.
I have little exposure to ethylene glycol and used to think it was non-toxic, after all it is widely used in consumer applications such as refrigerants or antifreeze. I just checked and found that it is indeed toxic···
The boiling point is relatively high, so there should be no danger. I hope someone who is an expert can answer this question.
This substance is contained in antifreeze and windshield washer fluid
The last edit to this post was made by cjgj008 on 2018-10-30 at 15:30. One thing that needs special attention is that ethylene glycol has a relatively high viscosity; at -15 degrees, it is around 80 mPa·s (for reference only). Therefore, this factor must be taken into consideration when selecting a pump. Relatively speaking, magnetic pump is more sensitive to viscosity and has lower efficiency, while centrifugal pumps have a slightly higher tolerance for viscosity. However, magnetic pump is a theoretically leak-free pump, and it may offer better safety and environmental performance. Each has its advantages and disadvantages. But no matter which pump is chosen, the viscosity value must be specified to the manufacturer.