Featured Project: Zero-Odor H₂S Control at SRU Truck Loading Rack – Washington Refinery
A Washington refinery’s sulfur recovery unit (SRU) loading rack emitted 1,500 ppm H₂S odors during truck filling, forcing drivers to wear SCBAs with open hatches for visual verification — violating OSHA H₂S PEL (10 ppm) and risking Washington Ecology odor standards.
Envent delivered an unmanned, automated vapor control system that reduced inlet 1,500 ppm to 0.0 ppm — eliminating SCBAs and odors permanently.
The Challenge
- 1,500 ppm H₂S + mercaptans during truck loading
- Drivers required SCBAs with open hatches
- Odors affecting personnel and nearby community
- Must comply with OSHA 1910.1000 Table Z-2 (H₂S 10 ppm) and EPA NESHAP 40 CFR Part 61 Subpart K
- Long-term, unmanned solution required
Envent’s Unmanned Automated Vapor Control Solution
| Component | Equipment & Envent Service Link | Purpose |
|---|---|---|
| Vapor Capture | Interchangeable dome hatch with windows + 500 CFM movable vacuum arm | Safe visual fill checks, 100% vapor capture |
| Sulfur Fines Knockout | ESCRUB 1000-P | Removed fines before scrubbing |
| H₂S Scrubbing | ESCRUB 1000-SS Recirculating Packed Column with proprietary media | 1,500 ppm → 0.0 ppm (>99.99% removal) |
| Automation | Plant power tie-in + remote monitoring | Fully unmanned 24/7 operation |
Performance
- Inlet: 1,500 ppm H₂S
- Outlet: 0.0 ppm H₂S (non-detect)
- Zero odors, zero complaints, zero SCBA use
Proven Results: Zero Exposure, Zero Complaints
| Benefit | Project Impact |
|---|---|
| H₂S Reduction | 1,500 ppm to 0.0 ppm – drivers work SCBA-free |
| Worker Safety | Full OSHA 1910.1000 compliance |
| MOC Streamlining | Envent drawings cut refinery MOC time by weeks |
| Odor Elimination | Zero complaints from personnel/community |
| Reliability | Unmanned 24/7 with no downtime |
This project showcases Envent’s vapor scrubbing services for high-H₂S SRU applications.
Need H₂S Odor Control for Truck Loading or SRU Racks? Get your Free OSHA/Ecology Compliance Review & Quote today → Request a Quote Call Envent’s Gulf Coast Team at 888-997-9465 or email [email protected] — we eliminate odors and risks, fast.
