Quick opening closures (QOC) are engineered doors with quick action mechanism, used for quickly accessing pipelines or pressure vessels without the need of conventional tools. Typical applications are end closures for pig launchers & receivers (scrapper trap doors), pressure vessel end closures (filter vessel quick open closures) and blow down lines end closures. Sungov designs and manufactures three types of quick opening closures namely Seg-Band Type (segmented band locking type), Clamp Type (double yoke type) and Swing Bolt Type closures.
Our Seg-Band Type and Clamp Type closures are designed in accordance with ASME Sec VIII Div. 1 UG-35 requirements. This means, inherent to the QOC design is the inclusion of a pressure warning device as well mechanical safety interlock to avoid inadvertent opening of closures under pressure. This ensures safety to the operator and the environment.
The closure seal is a uniquely engineered seal which is designed to provide maximum sealing protection under high pressure as well as high temperature. Closures can be offered with ASME Code stamping (Part MDR) as option.
| Seg-Band Type | Clamp Type | Swing Bolt Type | |
|---|---|---|---|
| Installation | Vertical/Horizontal | Vertical/Horizontal | Vertical |
| Size | DN 200 to DN 1200 | DN 150 to DN 1000 | DN 150 to DN 1000 |
| Pressure | ASME #150 to #1500 | ASME #150 & #300 | ASME #150 to #600 |
| Materials | SA 350 LF2 | SA 350 LF2 | SA 516 70N/SA 105N |
| Sealing | Viton™ | Viton™ | Viton™ |
Other specifications may be possible. Contact us today.
Frequently Asked Questions
A Quick Opening Closure (QOC) is a specialized access door designed for rapid and safe entry into pipelines or pressure vessels. It allows for quick inspection, maintenance, or cleaning without the need for conventional tools, ensuring minimal downtime in industrial operations.
For pressure vessels, the choice of Quick Opening Closure depends on factors like pressure rating, size, and installation orientation. Sungov offers closures designed in accordance with ASME Sec VIII Div. 1 UG-35 requirements, ensuring safety and compliance for pressure vessel applications.
Quick Opening Closures are typically constructed from materials such as SA 350 LF2, SA 516 70N, or SA 105N, depending on the type and application requirements. These materials provide the necessary strength and durability to withstand high-pressure environments.
Quick Opening Closures are designed with safety features like pressure warning devices and mechanical safety interlocks. These features prevent inadvertent opening under pressure, ensuring operator safety and environmental protection during maintenance or inspection activities.
