Double Pig System
The Double Pig System
Overview and Demonstration
The double pig pigging system is commonly used for processes where the product cannot come into contact with air, such as beer, wine and foam gel products.
How a Double Pig Product Recovery (Pigging) System Works
In this example, both the pig launch stations and pig receive stations include pig housings to enable clean in place (CIP). Before the product is transferred, a pig is sent to the outlet of the pump to reduce the air in the line. Product is then transferred into the line behind the pig. The product then pushes the pig to the destination where the pig re-enters its housing. Once the transfer is complete the line is cleared by a second pig as if it were a single-pig pigging system.