The Challenge
A natural gas transmission and distribution operator was experiencing recurring odor complaints from a nearby community whenever routine pipeline blowdown events were performed. Although the releases were a normal part of system maintenance and operations, the odorized natural gas vented during these events often led residents to believe a gas leak was occurring, resulting in customer complaints, concern from the public, and additional time spent by personnel responding to inquiries.
The operator sought a solution that could significantly reduce the odor impact of blowdowns without disrupting operations. They partnered with Welker to develop and implement a practical, field-proven odor mitigation system capable of addressing community concerns while supporting safe and efficient maintenance activities.
The Welker Solution
Welker engineered and manufactured a custom Odorant Neutralizer System (ONS) designed to automatically neutralize mercaptan odors during pipeline blowdowns.
The system utilizes existing pipeline gas pressure to atomize and distribute a proprietary neutralizing agent through strategically positioned spray nozzles mounted around each vent stack. As natural gas is vented, the neutralizer is injected into the gas stream, helping reduce detectable odor before it leaves the facility.
By automating activation based on blowdown pressure, the system eliminates manual intervention and ensures odor mitigation begins precisely when venting occurs.
The result is a safer, more efficient blowdown process that helps operators maintain positive community relations while supporting regulatory and operational objectives.
The Welker System
The installed Welker Odorant Neutralizer System consisted of a centralized neutralizer supply package paired with dedicated vent stack nozzle assemblies.
The main system included:
- 75-gallon OdorXice™ neutralizer storage tank
- Automated touchscreen controller
- Pressure-responsive activation controls
- Welker F-31™ Filter Dryer
- Flag Tracker with magnetostrictive level transmitter
- Multi-stage gas regulation system
- System status and alarm indication lights
- Vent stack spray nozzle assemblies
- Skid-mounted enclosure designed for outdoor installation
The system was engineered to support multiple vent stack locations from a single neutralizer supply package, reducing equipment duplication and simplifying long-term operation and maintenance.
Key Welker Components
Welker F-31™ Filter Dryer
Flag Tracker with Magnetostrictive Level Transmitter
Touchscreen Controller
A user-friendly touchscreen interface provides operators with system status, alarm monitoring, and operational visibility, simplifying training and ongoing operation.
Vent Stack Nozzle Assemblies
Dedicated nozzle assemblies mounted around each vent stack provide uniform distribution of the neutralizing agent, ensuring effective mixing with the vented gas stream for improved odor suppression performance.
Welker OdorXice™ Plus
Welker OdorXice™ Plus is specifically formulated to neutralize mercaptan odors generated during natural gas blowdowns, helping operators reduce nuisance odors and maintain positive relationships with surrounding communities.
Results
The Welker Odorant Neutralizer System provided the operator with an automated and repeatable approach to odor mitigation during natural gas blowdown operations.
By integrating pressure-responsive activation, engineered vent stack spray distribution, and Welker’s proprietary neutralization technology, the system helped:
- Reduce mercaptan odor emissions during blowdowns
- Minimize public complaints and concerns
- Improve operational efficiency through automation
- Enhance operator visibility with real-time monitoring
- Support multiple vent stacks from a centralized platform
- Reduce maintenance through robust filtration and system design
