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Bypass composite sampling of crude oil and light liquids products

      • Sample lines up to 1”
      • Low and high pressure applications
Sample API 8.2 ASTM D4177 ISO 3171    

Need a bypass sampler with a proven track record? Look no further than the Welker inLoop™ Crude Oil Sampler! On the market for nearly 30 years, the inLoop™ is a positive displacement pump designed for crude oil and light liquid sampling applications. Ideal for lines up to 1”, take quality sample grabs proportional to flow or time with the inLoop™ at the heart of your bypass sampling system.


  • Double-acting piston motor
  • Fixed volume positive displacement collection heads
  • Inline relief at sample outlet


  • Pumping power capable of sampling high-viscosity products
  • Capture and fully push samples to the sample container
  • Piston-style collection head compatible with extreme temperatures, high pressures, and chemical contaminants
  • Prevents collected samples from flowing back to the pipeline if pipeline pressure drops
More Information
Maximum Allowable Operating Pressure : 150 ANSI Stainless Steel: 275 psig @ -20 °F to 100 °F
300 ANSI Stainless Steel: 720 psig @ -20 °F to 100 °F
600 ANSI Stainless Steel: 1440 psig @ -20 °F to 100 °F
900 ANSI Stainless Steel: 2160 psig @ -20 °F to 100 °F
1500 ANSI Stainless Steel
Pipeline Spool Connection : Size: 1" or 1½"
Rating: 150, 300, 600, 900, or 1500 ANSI RF
Process Connection : ¼" FNPT
Sample Outlet : ¼" FNPT
Utility Requirements : Hydraulic or Pneumatic Supply: 40–65 psig
Sample Volume : B-Style Collection Head: 0.5 cc, 1 cc, or 2 cc
Vanishing Chamber™ Collection Cup: 0.22 cc, 0.5 cc, 1 cc, or 1.5 cc
Operation : Piston
Industry Standards : API Chapter 8.2, ASTM D4177, ISO 3171

Weight and/or dimensions are approximate.

Specifications subject to change without notice.

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