Product Overview
Enardo® ES-660-HF 8" API 650 High-Performance Pressure/Vacuum Thief Hatch
The Enardo® ES-660-HF is a high-performance pressure/vacuum thief hatch designed for standard 8-inch API 650 tank openings. As the successor to the Enardo 660 series, the ES-660-HF incorporates improved sealing technology to help reduce vapor loss and fugitive emissions while providing increased venting capacity for atmospheric and low-pressure storage tanks. It is designed as a direct replacement for standard 8-inch API thief hatches used on steel and fiberglass storage tanks.
Engineered for applications requiring both reliable pressure relief and enhanced emissions control, the ES-660-HF combines a tighter sealing design with higher flow capacity than conventional thief hatches. During upset conditions, the hatch provides rapid pressure relief while maintaining an excellent seal during normal operating conditions to help reduce product loss.
Features
- Fits the standard 8-inch API 650 bolt pattern
- Direct replacement for many Enardo 660 series thief hatches
- High-performance pressure and vacuum relief design
- Enhanced sealing technology helps reduce vapor loss and fugitive emissions
- Higher venting capacity than standard thief hatches
- Spring-loaded aluminum construction
- Non-sparking aluminum body
- Suitable for steel and fiberglass storage tanks
- Available in multiple factory pressure and vacuum settings
Available Configurations
Select the pressure and vacuum settings appropriate for your storage tank application.
- Pressure Settings: 4, 6, 8, 12, and 16 oz./sq. in.
- Vacuum Settings: 0.4, 0.9, and 3.5 oz./sq. in.
Optional factory configurations are available with various gasket materials and accessories, including Viton® sealing components, replacement base gaskets, bolt kits, and protective coatings.
Typical Applications
- API 650 atmospheric storage tanks
- Crude oil storage tanks
- Produced water tanks
- Fuel storage tanks
- Chemical storage tanks
- Steel storage tanks
- Fiberglass storage tanks
Construction
- Body: Non-sparking aluminum
- Standard 8-inch API mounting pattern
- Spring-loaded pressure/vacuum relief mechanism
- High-performance sealing system
Manufacturer Page: Enardo / Emerson ES-660
Replacement Parts Available
Hess Services also stocks replacement components for many API 650 thief hatches, including replacement mounting gaskets, bolt kits, and complete replacement thief hatches.
If you are replacing an older Enardo 660 thief hatch or are unsure which pressure or vacuum setting is required for your application, please contact us. Our experienced staff will be happy to help identify the correct replacement model for your tank.
