Is unloading much slower than before? Could a Haiyou help analyze what the reason is? ? ?

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Recently, the process of pumping and transferring liquid has been much slower than before. Normally, it takes about 40 minutes to load or unload around 8 tons of sodium hypochlorite, but now it takes around one and a half hours. Initially, this was due to low temperatures at the filter at the entrance, which caused severe crystallization and blockages; now, a steam pipe has been added for heating, and the plastic-lined pipes in the upstream section have also been wrapped with such pipes. The slowdown in the transfer speed occurred after the addition of these heating pipes, as pressure fluctuations arose as a result. What was analyzed on site didn’t reveal the cause. Our pipeline design involves plastic-lined pipes with a diameter of 50 mm at the beginning, connected to a filter and a diaphragm valve; after that, the diameter increases before decreasing again, and it’s connected to a pump (in short, it seems like fluid flows from a smaller diameter to a larger one). But this setup has been in use before. After much consultation, some suggested that the plastic lining might have melted and deformed, which is a possible explanation; however, my colleagues on site said that everything had been checked and that it wasn’t a problem with the pump. The replacement pump also arrived very slowly