Pigging & Drying
Pigging and drying are essential steps in the pipeline pre-commissioning process, ensuring that new or refurbished pipelines are free of debris, moisture, and contaminants before they are placed into service. These processes protect the integrity of the system, reduce long-term maintenance costs, and ensure compliance with industry and safety standards.
At American Pipeline Solutions (APS), we provide reliable pigging and drying services that prepare your pipelines for safe, efficient operation.
Pigging: Preparing the Pipeline for Service
The first step in pre-commissioning is pipeline pigging, which involves running specialized devices (known as pigs) through the line to remove construction debris, mud, scale, and standing water.
APS utilizes a variety of cleaning pigs equipped with transmitters, allowing our team to monitor their progress and ensure complete coverage throughout the line. These pigs are carefully selected based on pipeline size, material, and the type of debris present. Common pig types include:
Foam pigs for removing residual water and soft debris
Brush pigs for scraping scale and tougher deposits
Bi-directional pigs for cleaning pipelines where flow may be reversed
Tracking pigs for accurate location monitoring
This step is critical to prevent future flow restrictions and to prepare the system for effective drying.
The first step in the pre-commissioning process is to run cleaning pigs through the line to remove construction debris. APS utilizes various types of cleaning pigs equipped with transmitters to clean not only construction debris but also mud, scale, and standing water.
After the de-watering phase is complete the process of pipeline drying can begin. Another series of cleaning pigs and soft foam swabs are sent through the line until all standing water and scale is removed. The line is then dried to the required dew point utilizing oil free compressors and desiccant dryers or nitrogen. Pipeline drying normally specifies a -40° dew point, which is an indication of how much moisture the pipeline will contribute to the flow of gas.
Pipeline Drying: Achieving the Correct Dew Point
Once pigging and de-watering are complete, pipeline drying begins. APS deploys a sequence of soft foam swabs and drying pigs until no residual water remains. The line is then dried using advanced methods such as:
Oil-free compressors – ensuring clean, moisture-free air flow
Desiccant dryers – removing trace humidity to achieve precise dew points
Nitrogen drying – introducing an inert atmosphere to displace moisture and protect against oxidation
The industry standard for natural gas and many other systems is a -40° dew point. Achieving this target ensures that no excess moisture will be introduced into the product flow, helping to prevent corrosion, hydrate formation, and downstream equipment damage.
Why Pigging and Drying Matter?
Skipping or rushing these steps can result in serious operational challenges. Common risks include:
Corrosion and scale buildup from residual moisture
Blockages caused by leftover construction debris
Hydrate formation in natural gas systems
Flow inefficiencies that reduce throughput and increase energy costs
Proper pigging and drying not only extend pipeline life but also help operators avoid costly repairs, downtime, and compliance issues.
APS’s Expertise in Pigging & Drying
With years of experience in pipeline pre-commissioning services, APS has the equipment and technical knowledge to handle projects of varying size and complexity. Our crews are trained to work with:
Large-diameter pipelines requiring extended pigging runs
Complex systems with multiple low points and moisture traps
A variety of materials, including steel, ductile iron, HDPE, and PVC (with surface preparation when needed)
By combining transmitter-equipped pigs, reliable drying equipment, and proven procedures, APS ensures your pipeline is cleaned and dried to exact specifications—ready for safe and efficient operation.
Contact APS for Pigging & Drying Services
If you’re preparing a pipeline for commissioning, trust American Pipeline Solutions to deliver complete pigging and drying services that meet industry standards. Contact our team today to discuss your project requirements and ensure your pipeline is ready for service.
