Leakage problems of centrifugal pumps at high temperatures
Thread Content
At a temperature of 180 degrees, will there be leakage issues with high-temperature resistant centrifugal pumps? The required import and export pressure values are 5 kPa and 0.1 MPa for the medium, diesel :)
It is correct to use a high-temperature resistant pump, but when selecting such a pump, requirements should be placed on the mechanical seal of the centrifugal pump; a double-faced mechanical seal should be used, and cooling water must be supplied to the pump’s seal.
Diesel is divided into two main categories: light diesel (with a boiling point range of approximately 180–370°C) and heavy diesel (with a boiling point range of approximately 350–410°C). The most important properties of diesel in terms of performance are ignition quality and fluidity. Diesel is classified by freezing point; light diesel comes in five grades: 10, 0, -10, -20, and -35, while heavy diesel has three grades: 10, 20, and 30. The landlord should pay attention to the boiling point of the diesel you choose. If the boiling point is no problem, a heat transfer oil pump can be used as a diesel pump.
When providing information to the pump manufacturer, specify the process conditions; the manufacturer will take these issues into account. It should be fine; I have worked on heat transfer oil pumps operating at around 300 degrees.
The requirements are not strict, and many pumps are suitable. Just be careful; if there is a large amount of leakage from the mechanical seal, it needs to be repaired immediately
The pump’s mechanical seal must be a double-segment bellows mechanical seal, and it must be equipped with an impeller as well as a separate cooling system
The original poster is referring to diesel; in that case, it’s easy to choose the right pump! Choose a pump without leaks; you can opt for a canned motor pump, one designed for high temperatures. Now, the temperature of high-temperature shielded pumps can reach 450 degrees. As mentioned above, if a magnetic pump is to be chosen, it’s difficult to select an appropriate material for the magnetic drive. Domestic manufacturers basically cannot achieve 180 degrees. 1. The magnetic core is made of ferrite, and it can be used at temperatures below 85 degrees Celsius ； 2. The operating temperature for neodymium-iron-boron is 120 degrees. 3. The operating temperature for rare earth cobalt can reach 300 degrees. Foreign manufacturers are capable of doing this: the British company HMD, the American company GOULDS Pump Company, as well as German companies such as SIHI. Going a step further, if it is a material that solidifies easily at high temperatures, then a high-temperature type of centrifugal pump should be chosen. A double-end mechanical seal is generally used, with an external sealant circulation system. The manufacturer will explain the specific details to you when purchasing the pump.
A temperature of 180 degrees is not very high, and most pumps can be used for this purpose. However, diesel is a flammable substance, so it is important to prevent leaks; therefore, choosing a pump with an adequate sealing system is crucial.
Using the original poster’s topic as a starting point, I’d like to ask which company is better for producing such high-temperature centrifugal pumps; magnetic pumps and shielded pumps are too expensive