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

Plug & Purge™

Banish Linefill

The first of its kind, the Welker Plug & Purge™ Automatic Purging System meets the latest recommendation of API 8.2 and ASTM D4177. Welker applied 25 years’ experience purging probe samplers to design the Plug & Purge™, which safely and effectively purges trapped liquid product from the sampler to the sample container. Incorporate the Plug & Purge™ into your automatic sampling system and increase your system’s accuracy.

Plug & Purge
Stand Out From the Crowd

The Leading Edge of Sampling Technology: Automated Purge

Stop contamination concerns before they start with the Plug & Purge™. When sampling batches of crude oil with different properties or different owners, sample representativeness is critical to custody transfer integrity. The Plug & Purge™ uses inert gas to displace linefill into the sample container so that no samples remain in the system to contaminate the next batch.

The Bottom Line Is the Bottom Line

Accuracy + Convenience = Monetary Savings

The Plug & Purge™ delivers a double shot of a controlled volume of compressed inert gas to fully clear your sampler and system tubing in under a minute. By pushing these trapped samples to the sample container, the Plug & Purge™ ensures your composite sample is representative of the entire batch and that no samples remain to contaminate subsequent batches. Purge your system from the comfort of the control room when you connect the Plug & Purge™ to your sampling system’s Programmable Logic Controller (PLC).

Have confidence in your sampling system during normal operations and during proving. Use the Plug & Purge™ and know there is no water trapped in your sampler to skew the results of water injection tests.

Inert Gas
Inert Gas
The Goldilocks Principle

A Proper Purge the First Time, Every Time

Eliminate the human error and safety concerns of manual purge operations. The Welker Purge Cylinder clears your sampling system with the same necessary volume of compressed inert gas each purge cycle. Your inert gas won’t go to waste, and sample representativeness isn’t compromised by under-purging or over-purging.

Plug & Play

Modular Design

Easily upgrade existing equipment or customize a new sampling system. On a standardized 20” x 20” panel with two types of mounting holes, the Plug & Purge™ can be installed where it’s most convenient for you—to a wall in a shelter or to a 2” pipe stand. An independent system, the Plug & Purge™ can be isolated for maintenance so you don’t have to incur the cost of interrupting sampling operations.

Modular Design


Plug & Purge Automatic Purging System
 Plug & Purge
Materials of ConstructionMaterials of Construction 316/316L Stainless Steel, PTFE, Viton®
Inert Gas Inlet1/4" Tubing
Purge Outlet1/4" Tubing
Solenoid Input & Return1/4"Tubing
Utility RequirementsInert Gas Supply for Purge Operation
Hydraulic or Pneumatic Supply (Optional): 50-116 psig
Electrical ConnectionSolenoid: 1/2" FNPT, AC 120 V
Pressure Transmitter (Optional): 1/2" FNPT, DC 24 V
Volume25 cc Cylinder and 50 cc Purge
Dimensions20" x 20" x 1/4" (Length x Height x Width)
Operating PressureActuation: 116 psig @ -20 °F to 120 °F
Downstream of Regulator: 1500 psig @ -20 °F to 120 °F
Pneumatic: 2500 psig @ -15 °F to 120 °F
Electrical Area ClassificationNEC Class I, Div. 1, Groups A, B, C, & D, T3