DUAL DIAMETER Cleaning Pigs
Designed for reducers, diameter transitions, and variable pipeline sections.
When pipelines transition between two diameters, standard cleaning pigs can lose sealing force or cleaning efficiency. Enduro’s Dual-Diameter Cleaning Pigs are engineered to navigate those transitions while maintaining consistent contact and debris-removal performance.
Built in Tulsa and designed for real-world field conditions, our dual diameter pigs help operators clean efficiently across reducers, diameter changes, and varying pipeline sections.
What Is a Dual Diameter Cleaning Pig?
A dual diameter cleaning pig is designed to travel through pipelines with two different nominal diameters — such as 16” to 14” or 24” to 20” transitions — while maintaining effective sealing and cleaning action.
These pigs are commonly used in lines with reducers, expansion points, or variable diameter segments where a standard pig would be ineffective or risk bypass.
(Custom options available for unique applications.)
When Should You Use a Dual Diameter Pig?
Dual diameter pigs are ideal when:
- Your line includes diameter transitions
- You need consistent cleaning across reducers
- You are preparing for inline inspection (ILI)
- Debris removal is required in variable diameter segments
- Maintaining flow efficiency across transitions is critical
Cleaning Performance Across Diameter Changes
Enduro’s dual diameter pigs are engineered to:
- Maintain sealing force through diameter transitions
- Remove wax, scale, and operational debris
- Capture ferrous debris when configured with magnets
- Support ILI preparation by improving line cleanliness
- Reduce risk of stalled runs at reducers
Configurable to Your Pipeline Conditions
Dual diameter pigs can be configured based on:
- Pipeline diameters and reducer type
- Product type (crude, refined products, gas, NGL, water)
- Debris profile (wax, scale, metal fines, sludge)
- Flow conditions
- Maintenance vs. inspection preparation objectives
Available configuration options include:
- Cups or discs
- Brush elements
- Magnetic elements
- Gauge plates
- Bypass systems
- Specialty urethane formulations
Common Dual Diameter Transition Examples
- 16” x 14”
- 20” x 16”
- 24” x 20”
- 30” x 24”
Built for ILI Preparation
Proper cleaning is critical before an inline inspection run. Dual-diameter pigs are frequently used in preparation programs to ensure that inspection tools maintain consistent contact across diameter changes.
A clean line improves the quality of inspection data and reduces the risk of missed or masked anomalies.
Want to learn more about the pipeline pigging process? Pipeline Pigging Explained: Process, Types & Applications
How Dual Diameter Cleaning Pigs Navigate Pipeline Transitions
Dual diameter cleaning pigs are designed to maintain sealing force and cleaning performance as they travel through varying pipeline diameters. Flexible cups compress and expand as the tool moves through reducers and transition sections, helping maintain wall contact for debris removal, batching, and preparation for inline inspection.
Example of a dual diameter cleaning pig maintaining sealing contact while traveling through pipeline reducers and changing internal diameters
What Problem Does a Dual Diameter Cleaning Pig Solve?
Most pipeline cleaning pigs are designed for a single internal pipeline diameter. That works well when the pipeline remains consistent from launcher to receiver.
The challenge begins when a pipeline changes size.
Diameter transitions are common in:
- pipeline expansions
- tie-ins
- terminal connections
- aging infrastructure upgrades
- gathering systems
- offshore and transmission systems
A standard cleaning pig may struggle to maintain proper sealing force as the pipeline diameter changes. This can reduce cleaning effectiveness, allow debris bypass, increase wear, or create inconsistent pig performance throughout the run.
Enduro Dual Diameter Cleaning Pigs are specifically engineered to maintain effective sealing, cleaning, and tracking performance across multiple pipeline diameters.
Because every pipeline system is different, Enduro designs dual diameter pigs around your:
- pipeline sizes
- bend radius
- debris conditions
- flow rates
- pressure requirements
- cleaning objectives
The result is a pig designed for your actual pipeline conditions — not a generic “off-the-shelf” solution.
Why Standard Pigs Struggle in Diameter Changes
A conventional cleaning pig is typically built around one consistent pipe size.
When that pig encounters a larger or smaller diameter section, several problems can occur:
Loss of Seal
If the pig cannot maintain proper contact with the pipe wall, product and debris may bypass the pig instead of being pushed ahead.
Reduced Cleaning Efficiency
Inconsistent wall contact can leave behind:
- liquids
- sludge
- paraffin
- scale
- construction debris
Excessive Wear
Improper compression through transitions can increase wear on cups, discs, and sealing components.
Stalling or Damage Risk
Some pipeline transitions create conditions where improperly designed pigs can become unstable or damaged.
Enduro Dual Diameter Cleaning Pigs are engineered to flex and seal through pipeline transitions while maintaining cleaning performance throughout the run.
STS Cleaning Pig Specifications
Dual Diameter Cleaning Pig Specifications
Body Construction
Cleaning Elements
Optional Components
Pipeline Diameter
Primary Applications
ILI Preparation
Pipeline Types
Tracking Compatibility
Manufacturing
Steel-bodied cleaning pig designed to travel through pipelines with diameter transitions while maintaining sealing and cleaning performance.
Flexible cup and disc configurations designed to maintain sealing and cleaning effectiveness across reducers and diameter changes.
Magnets, brushes, and gauging plates can be added depending on debris type and cleaning requirements.
Designed for pipelines transitioning between two nominal diameters.
Pipeline cleaning across diameter transitions, reducers, and fittings.
Commonly used prior to inline inspection runs to improve pipeline cleanliness across diameter transitions.
Natural gas, crude oil, and refined product pipelines.
Transmitters can be installed to allow pig tracking with geophones, receivers, or NIPS units.
Designed and built in Tulsa, Oklahoma by Enduro Pipeline Services.
Request a Quote
For sizing, configuration recommendations, or custom builds: 800-752-1628
jrm@enduropls.com, or submit a
quick quote request online.
Browse all cleaning pigs
Why Choose Enduro?
- 30+ years of cleaning pig expertise
- Tulsa-built manufacturing
- Custom configurations
- Fast turnaround
- Direct technical support from cleaning pig specialists
When your pipeline includes diameter transitions, precision matters. Our team works directly with operators to ensure the right configuration for reliable performance.
FAQs
What is a dual diameter cleaning pig?
A dual diameter cleaning pig is designed to move through pipelines that transition between two nominal diameters while maintaining sealing and cleaning effectiveness.
Can dual diameter pigs include magnets or brushes?
Yes. Magnetic and brush elements can be added depending on the debris type and cleaning objective.
Are dual diameter pigs used before ILI?
Yes. They are commonly used during cleaning programs prior to inline inspection to improve line cleanliness across diameter transitions.
How do I determine the correct dual diameter configuration?
Configuration depends on the two diameters, reducer geometry, debris profile, product type, and whether the run is for maintenance cleaning or ILI preparation.
Related Cleaning Pigs
Not sure which cleaning pig is best for your pipeline? Compare pipeline cleaning pig types to see how STS, Advantage, Bi-Directional, and urethane pigs differ.
Come See How They’re Made
At Enduro Pipeline Services, we manufacture pipeline cleaning pigs in Tulsa, Oklahoma and regularly host customer tours and pigging education sessions.
Whether you are new to pigging or managing a complex cleaning program, our team can help you better understand:
- pig selection
- pipeline cleaning strategies
- dual diameter applications
- tracking solutions
- inspection preparation
We believe the best solutions start with education.
Schedule a tour, class, or consultation and come see how Enduro cleaning pigs are designed and manufactured.
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