Featured Project: Dockside Degassing of LNG-Powered Freight Vessel – EMECS-70 Mobile Thermal Oxidizer
A major shipping customer needed to depressurize and degas two 900 m³ LNG fuel tanks on a docked freight vessel to allow immediate cargo operations and scheduled tank maintenance — without delaying port turnaround.
The solution had to meet strict USCG, EPA, and port authority requirements while handling cryogenic temperatures and high-pressure methane vapors safely at dockside.
Envent delivered a fully permitted, turnkey system that finished the job with zero operational delay.
The Challenge
- Two 900 m³ LNG tanks containing residual liquid and high-pressure vapor
- Dockside operation — no ship delays allowed
- Cryogenic temperatures and high-pressure methane stream
- Must meet 33 CFR 127 (LNG Waterfront Facilities) and EPA marine vessel emissions standards
- Zero atmospheric release permitted
Envent’s Dockside LNG Degassing Solution
| Component | Equipment & Envent Service Link | Purpose |
|---|---|---|
| Cryogenic Transfer | Cryogenic-rated SS hose | Safe transfer from –260 °F LNG tank |
| Knockout & Heat Exchange | ASME knockout drum + fire-water jacket | Liquid vaporization & temperature increase |
| Pressure Control | High-pressure regulator | Precise delivery to oxidizer |
| Vapor Destruction | EMECS-70 Mobile Thermal Oxidizer | >99.9% DRE at 60,000 CFH methane-rich vapor |
Execution Highlights
- Fully permitted under USCG Operations Manual and port-specific requirements
- Continuous LEL, pressure, and temperature monitoring
- 24/7 Envent marine-certified operators
Proven Results – Zero Delay, Zero Emissions
| Benefit | Delivered Outcome |
|---|---|
| Vapor Destruction | >99.9% DRE verified by continuous monitoring |
| Ship Turnaround | Zero delay — cargo ops started on schedule |
| Maintenance Readiness | Tanks immediately available for entry & inspection |
| Regulatory Compliance | 100% USCG, EPA, and port authority compliant |
| Safety | Zero incidents in cryogenic/high-pressure operation |
This project established Envent as the go-to provider for marine & LNG vessel degassing nationwide.
Need to degas an LNG, ammonia, or dual-fuel vessel at dock? Get your Free Dockside LNG Degassing Plan & Quote today. Call Envent’s Marine Team at 888-997-9465 or email [email protected] — we keep ships on schedule and regulators happy.
