281.491.2331 13839 West Bellfort Street Sugar Land, TX
281.491.2331 13839 West Bellfort Street Sugar Land, TX
ISO 9001:2015
U.S. Patents
90 + U.S. Patents
Since 1954
Get A Quote



See the Light Ends

Prevent costly shrinkage with Welker’s award-winning CPCCP Constant Pressure Crude Oil Container. If you’re sampling live crude, keeping entrained gases in your composite sample is of utmost importance. To prevent gaseous crude from going flat, you need a container capable of maintaining pipeline conditions. Collect, retain, and mix high vapor pressure liquid products at pipeline pressure with the CPCCP for highly accurate measurement of all components.

Representative Sample
Contents Under Pressure

Representative Composite Samples

Pre-charge the CPCCP with an inert gas to collect samples at pipeline pressure. No pressure drop during sample collection protects against phase change and ensures sample integrity. Without allowing shrinkage, you can be sure your basic sediment and water (BS&W) and density measurements are accurate and not overstated.

Mixing It Up

Homogenous Samples

Built into the product chamber, the circulation pump eliminates dead volumes and reduces the risk of cross‑contamination. The turbulent mixing action homogenizes your composite sample for representative subsamples. Safely use the CPCCP in hazardous locations and areas with extreme ambient conditions thanks to the non‑electrical pneumatic motor.

Circulation Pump
A Safe Bet

Proven Safety

Both ends of the CPCCP come equipped with valves, gauges, and pressure relieving devices. These safety measures allow the operator to control and monitor the cylinder pressure and prevent the cylinder from overpressurizing.

Multipurpose Piston

Superior Design

1. Volume Indication

As the cylinder fills with sample, the piston moves, allowing product level to be easily monitored by referring to the volume indicator rod. A magnetostrictive level indicator can be added to communicate product level to a connected Programmable Logic Controller (PLC) or other signal control system for remote monitoring.

2. Contamination Prevention

As the cylinder is emptied, the piston wipes the cylinder walls clean and forces out remaining product and any contaminants, preventing cross-contamination between sample batches.

3. Environmental Protection

After subsample collection, pre-charge pressure pushes remaining product back to the pipeline or to a sump, ensuring no product is emitted to the atmosphere.


CPCCP Constant Pressure Crude Oil Container
Materials of Construction316/316L Stainless Steel, PTFE, Viton®
ConnectionsComposite Sample Draw/Drain/Return/Purge: 1/4" FNPT
Compressed Air Inlet: 1 1/4" FNPT (for Pneumatic Motor Operation)
Pre-Charge Inlet: 1/4" FNPT
Product Inlet: 1/4" FNPT
Utility Requirements(Filtered, Regulated, and Lubricated) Compressed Air (Pneumatic Motor Operation)
Inert Gas Supply (Pre-Charge)
Volume3 1/2" US Gallons @ 100%
Operating Pressure2160 psig MAOP @ -20 °F to 100 °F
Industry StandardsAPI Chapter 8, ASTM D3700, ASTM D4057, ASTM D4177, ASTM D5854, ISO 3170, ISO 3171