How Automatic Pigging Works, Pigging System for Pipeline Cleaning & Product Recovery

A Molchsystem is an advanced pipeline cleaning and product recovery technology that uses a pipeline pig driven by fluid pressure and mechanical scraping to remove residual material and clean pipelines efficiently. It is widely used in industries such as petrochemicals, food & beverage, pharmaceuticals, and coatings.

Working Principle: A pig is propelled through the pipeline by compressed air, nitrogen, or liquid. As it travels, it pushes residual product toward the pipeline outlet for recovery while simultaneously cleaning the inner pipe wall, achieving high recovery rates and effective online cleaning.

Pigging System Components

A complete pigging system typically consists of the following key components:

• Pig Launcher: Stores and launches the pig; serves as the starting point of pigging operations (can also function as a receiver in some designs).
• Pig Receiver: Receives the pig after operation (can also act as a launcher for bidirectional systems).
• Pig: A slightly oversized elastic device that seals against the pipe wall to push and remove residual materials.
• Driving Medium: Compressed air, water, or other fluids used to propel the pig.
• Control System: Includes valves, sensors, and automation systems to control pig movement and monitor operation status.

Pigging Process

1. Insert the pig into the launcher and seal the system
2. Introduce compressed air, nitrogen, or liquid as the driving medium
3. Propel the pig through the pipeline
4. Push residual product to the pipeline end for recovery
5. Receive the pig in the receiver
6. Reset the system for the next cycle

The entire pigging process typically takes only a few minutes and can be fully automated. Compared to traditional CIP (Clean-in-Place) systems, it significantly reduces cleaning time, water usage, and chemical consumption.

In pigging operations, system stability and automation largely depend on a critical component—the pig station. Therefore, it deserves special attention.

Pig Station (Launcher / Receiver)

A pig station is a specialized valve unit integrating pig launching, receiving, driving control, and position monitoring. It is a key component ensuring safe and stable pigging operations.

• Driving Medium Supply: Provides compressed air or liquid to move the pig
• Pig Handling: Enables pig launching and receiving
• Position Detection: Uses sensors to monitor pig location and movement

Advantages of Pigging Systems

• High Product Recovery: Achieves near 100% recovery of residual material, especially valuable for high-cost products
• Reduced Cross-Contamination: Allows multiple products or colors to share the same pipeline
• Short Cleaning Time: Completes cleaning in minutes, improving production efficiency
• Lower Water & Chemical Usage: Minimizes wastewater and hazardous waste generation
• High Automation: Integrates with PLC systems for one-click operation
• Reduced Operating Costs: Decreases material loss, labor, and cleaning resources
• Improved Flexibility: Supports multi-product and small-batch production

VP Pigging Technology

Founded in 1996, BJVP is a professional pigging system manufacturer providing global customers with complete solutions, including R&D, process design, equipment manufacturing, and engineering support. Our systems are widely applied in petrochemical, food, pharmaceutical, and coatings industries to deliver efficient, safe, and automated pipeline cleaning and product recovery.

• Process Design: Customized process flow, parameters, and equipment selection for optimal performance
• Technology Development: Continuous innovation to improve system efficiency and reliability
• Manufacturing & Engineering Support: High-quality equipment production with on-site installation guidance

VP Pigging Technology — Efficient, Reliable, and Safe Solutions for Pipeline Cleaning and Product Recovery.