Saving Water by Pigging
Why Companies Use Pigging Systems to Save Water
Companies that process liquids often use massive amounts of water to manufacture their products.
In many countries, droughts are far too common, and water is a scarce and precious resource.
Wherever they are located, many companies are aiming to reduce their water use and have clearly defined water conservation and sustainability targets.
Liquid product recovery (pigging) systems reduce water consumption, especially the need for long, continuous pipeline flushes between product transfers and product changeovers. This is because the system recovers most of the product residue from the pipeline, so there’s less product (usually just a trace) to remove, so less flush required.
There are many other ways in which HPS pigging technology saves water. For example, processes that need only a water flush can use the dual-pig system, which is where a slug of water is pushed through the pipe between two pigs, cleaning as it goes. The water in the dual pig system can be tightly controlled.
Another way in which HPS pigging technology is used to save water is by using washout/sanitization water instead of compressed air to push the pig when recovering product residue after a transfer. The pig can then be washed at the receiver before being returned to the launcher with compressed air.
Another method of saving water is that it’s often possible to use a pig to recover washout/sanitization water to a recovery tank, where the water can then be reused or recycled, rather than being sent to waste or drain.
There are other methods in which HPS technology can be used to save water.
This short video explains why pigging is a green technology that helps companies that process liquids to save water.
Here’s a more detailed blog post about how pigging saves water.
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