For high-viscosity liquids, what flushing scheme should be used?
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About 60 centipoise, tar – what approach should be used?
What’s the temperature? We have the one that uses 32 directly. There are also 32+53A (53A with an auxiliary pump)
By using a gear pump directly, there is no need for a flushing scheme; we use gear pumps here.
Why use 32? The medium is tar; using 53 seems a bit wasteful, doesn’t it? I think 02+11+62 should work, right?
Coal tar contains many impurities, which can easily damage the sealing surfaces; therefore, VGO is used for flushing externally at 32.
It has an axial seal; previously, packing was used, which caused leaks. Now a mechanical seal is used, and although there are still leaks, the amount of leakage is less. This is the tar produced by our styrene plant. Previously, we used internally meshing gear pumps imported from Denmark; they were very effective, but their price was extremely high. The domestically produced externally meshing gear pumps that we use now cost only a fraction of what the Danish ones did. Ah! ! ! ! ! ! ! ! ! ! ! The “Danish ROTAN internal gear pump” distributed by Shanghai Panxing.