Refined Products Sampling
Precision sampling for gasoline, diesel, and jet fuel —
engineered to deliver true, representative results across every batch.
Accurate sampling of refined petroleum products is critical for maintaining product quality, ensuring regulatory compliance, and protecting custody transfer value. Welker’s refined products sampling systems are engineered to deliver true, representative samples — capturing the complete profile of your product, from head to tail of the batch.
With over hundreds of years of experience and hundreds of installations worldwide, Welker is the trusted authority in refined products sampling.
The Importance of Representative Sampling in Refined Products
At the end of the refining process — when fuels are stored, blended, or transferred — small sampling errors can create big consequences. Differences in product density, vapor pressure, or blending ratios can affect both compliance and valuation.
Welker’s refined products sampling systems are designed to:
- Capture head, middle, and tail segments for complete batch representation
- Ensure accurate composition analysis in line with ASTM D4177 and ISO 3171
- Reduce contamination and vapor loss for consistent, repeatable results
- Support both custody transfer and quality control applications
Refined Products Sampling Equipment
From sample extraction to containment, Welker’s refined products line covers every step of the sampling process.
Each system is engineered for precision, reliability, and long-term performance in fuel applications such as gasoline, diesel, jet fuel, and biofuels.
Inline Sampler
The inFlow™ Lite delivers dependable, automatic sampling for lighter refined hydrocarbons. Compact and easy to maintain, it provides repeatable grab samples directly from the line — without vapor loss or bias.
- Ideal for gasoline, diesel, and aviation fuel applications
- Maintains consistent sample volume across variable pressures
- Lightweight, corrosion-resistant construction
- Compliant with ASTM D4177 requirements
Fast Loop Sampler
Purpose-built for head, middle, and tail sampling, the inLoop™ RFP ensures representative batch sampling during refined product transfer. It’s the trusted solution for custody transfer, terminal loading, and multi-batch operations.
- True proportional sampling through the entire batch
- Compatible with composite or spot sample collection
- Designed for high-pressure refined products service
- Meets ASTM D4177 and ISO 3171 standards
Containment
Once the sample is taken, maintaining integrity is everything. The LS-14 Container is engineered to securely contain refined product samples without contamination or vapor loss.
- Ensures accurate lab analysis for custody transfer validation
- Compatible with both inFlow™ Lite and inLoop™ RFP systems
Head, Middle, and Tail Sampling for Refined Products
Welker’s refined products systems are engineered to achieve batch-representative sampling — collecting samples from the beginning, middle, and end of the transfer. This ensures a composite sample that accurately represents the entire load, regardless of flow rate or viscosity.
As required by U.S. EPA regulations (40 CFR 1090) and ASTM D4177, head/middle/tail sampling provides confidence in your product integrity and protects both buyer and seller during custody transfer.
Refined Products Expertise You Can Trust
From refineries to terminals and testing laboratories, Welker’s refined products sampling systems are trusted across the globe for their proven accuracy, reliability, and engineering excellence.
With years of experience and ISO 9001:2015 certification, we design, build, and support every system in-house — ensuring unmatched quality and performance for your refined product sampling applications.
Get the Representative Sample Your Business Depends On
Welker has set the standard in sampling technology for refined petroleum products. From refineries to terminals, our systems are built to deliver the accuracy, safety, and durability your operation depends on.