Abstract: In a tube cleaning system and method, multiple steps can be run with a single pass by using a combination pig train. For example, an initial combination pig train may include a plurality of bristle pigs and polymer trailing pigs with a cleaning solution between each pair. One example is a first leading bristle pig and a first trailing polymer pig containing a first slug of caustic cleaning solution followed by a second bristle pig and second polymer trailing pig containing a second slug of caustic cleaning solution. Another example is a leading bristle pig, a middle bristle pig, and a trailing polymer pig with a cleaning composition disposed between the leading and middle bristle pigs and a cleaning composition disposed between the middle bristle pig and the trailing pig. Such combination pig trains are moved through the tube to be cleaned in a single pass to achieve two cleaning steps.

Abstract: A clean-in-place system for piping systems uses a pig train having a dry ice and glycol section. The pig train is moved through the piping system as part of a cleaning sequence. The system and method of the disclosure provide an alternative, effective clean-in-place system that significantly reduces water, chemical and energy usage as well as significantly reducing the related environmental impact.

Abstract: A clean-in-place system for piping systems uses a pig train having a dry ice and glycol section. The pig train is moved through the piping system as part of a cleaning sequence. The system and method of the disclosure provide an alternative, effective clean-in-place system that significantly reduces water, chemical and energy usage as well as significantly reducing the related environmental impact.