Tank Drop Off Pigging
Overview and System Demonstration
A Tank Drop-off System is similar to a standard single-pig system, but incorporates multiple destinations on the same line to deliver product to.
There is no limit on the amount of drop-offs that can be used. After a transfer to a tank, the automatic pigging sequence sends a pig to the blocking valve for that tank. Any blocking valves between the destination and the pig are opened to allow for a clear route. The pig is then returned with the same receive-return pigging station used on a single-pig system.
How a Tank Drop Off Pigging System Works
This example uses a 3-way 120° Pig Launch Valve and a 2-way Ball Valve both using HPS Inflatable Seal Technology.
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