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inFlow™ Crude Oil Sampler

Where to Use

Main line isokinetic composite sampling of condensate, crude oil, or other liquid hydrocarbons

      • All custody transfer applications
      • Transmission pipelines
      • High-speed sampling for short sample batches
Sample API 8.2 ASTM D4177 ISO 3171    

With a forty-year track record of accurate, reliable, and repeatable results, the Welker inFlow™ Crude Oil Sampler is the sample extractor for most main line sampling applications. Inserted into the center one-third of your conditioned pipeline, the inFlow™ collects isokinetic samples of condensate, crude oil, and other liquid hydrocarbons. With an adjustable insertion length, optional automatic insertion, and four collection heads to choose from, there’s an inFlow™ poised to take advantage of your process conditions.


  • Double-acting piston motor
  • Manual or automatic insertion
  • Adjustable insertion length
  • Fixed or adjustable volume positive displacement collection heads
  • Welker Volume Eliminator
  • Collection head with inline relief
  • Optional sand reliefs
  • Optional Welker Purge Tube


  • Pumping power capable of sampling high-viscosity products
  • Insert and retract the shaft under reduced or full pipeline pressure
  • Retractable shaft allows for pipeline pigging and inspection or equipment maintenance without costly shutdowns
  • Reach the center third of multiple pipeline diameters
  • Capture and fully push samples to the sample container
  • With adjustable collection heads, collect large grabs for small volume batches
  • Minimize sample retention and keep residual sample at a minimum
  • Inline relief prevents collected samples from flowing back to the pipeline if pipeline pressure drops
  • Sample products containing basic sediment and water (BS&W) without the extra wear and tear (optional)
  • Purge trapped liquid from the collection head to the sample container for a complete composite sample and to prevent batch cross-contamination (optional)
inFlow™ Crude Oil Sampler
More Information
Product Category : Crude Oil Sampling
Maximum Allowable Operating Pressure : 150 ANSI Stainless Steel: 275 psig @ -20 °F to 100 °F
150 ANSI Carbon Steel: 285 psig @ -20 °F to 100 °F
300 ANSI Stainless Steel: 720 psig @ -20 °F to 100 °F
300 ANSI Carbon Steel: 740 psig @ -20 °F to 100 °F
Pipeline Connection : Size: 2"
Rating: 150, 300, or 600 ANSI RF
Sample Outlet : ¼" FNPT
Insertion Length : 0"–18"
Others Available

Weight and/or dimensions are approximate.

Specifications subject to change without notice.

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