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
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Accu/Line Lo

Accu/Line Lo

Patent Pending


Accu/Line Hi

Accu/Line Hi

Brains and Brawn

Welker’s turnkey natural gas injection odorization solution for flow rates from 1 Mscfh up to 70 MMscfh  and a maximum operating pressure of 1800 psig.

Flow Rate

Accu/Line System
Up To

70 MMscfh

Where to Use

  • Transmission Pipelines
  • Distribution Pipelines
  • Compressor Stations
  • Power Plants
  • Peaking Facilities
  • Municipalities
  • Renewable Natural Gas (RNG), Biogas, and Biomethane Odorization

Go With the Flow

The intuitive touch screen controller is the brains of the operation. Receiving feedback from the customer gas flow meter and system odorant flow meter, the controller adjusts the injection rate to changing flow conditions, ensuring continuous proportional to flow odorization. Measuring every pump stroke volume to an accuracy of 0.002 cc, the system odorant flow meter guarantees precise odorant injection.

Real-Time Communication

In the Know

Monitor and troubleshoot the Accu/Line™ on-site at the touch screen controller or remotely via Modbus to ensure optimal system performance. Access time- and date‑stamped historical records saved to the installed microSD card for accurate reporting, planning, and scheduling.


For the Long Haul

Improve system responsiveness to variations in flow rate with two odorant injection pumps of different volumes, or limit interruptions to operation with identical redundant pumps. The Welker F-9 Filter and Welker F-5 Filter Dryer prolong the operational life and reliability of the pumps by removing contaminants from the odorant and pneumatic supplies.


Size Matters

From 5 gallons to 10,000 gallons, the odorant supply tank can be sized to suit a broad range of flow rates. Regardless of volume, each tank comes with 110% containment sloped to the drain to protect against contamination and ease clean up.


Accu/Line™ Injection Odorization System
Materials of ConstructionLo: 316/316L Stainless Steel, Anodized Aluminum, Buna, Kalrez® Collection Cup and Dynamic Seals, PTFE, Viton® Static Seals
Standard: 316/316L Stainless Steel, Anodized Aluminum, Kalrez®, PTFE
Hi: 316/316L Stainless Steel, Anodized Aluminum, Kalrez®, PTFE
PowerDC 24 V
AC 120 V
Optional Solar Panel
Injection Outlet Connection1/4" Tubing
Instrument Gas Connection3/8" Tubing
Odorant Inlet Connection3/8" Tubing
Vent Connection3/8" Tubing
Odorant Inlet Pressure Required10 psig–50 psig
Instrument Gas Pressure RequiredLo: 15 psig–70 psig
Standard: 30 psig–225 psig
Hi: 30 psig–225 psig
Injection VolumeLo: 0.06 cc, 0.2 cc, or 0.5 cc
Standard: 0.5 cc–10 cc
Hi: 10–150 cc
Injection RateLo: Up to 10 Injections/Minute
Standard: Up to 5 Injections/Minute
Hi: Up to 3 Injections/Minute
Odorant Tank Volume120 US Gallons
250 US Gallons
500 US Gallons
1000 US Gallons
Ambient Temperature-20 °F to 120 °F
Operating Pressure1800 psig