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
Q 1. What is a quick opening closure?
A quick opening closure (QOC) is a mechanical device used to seal pressure vessels, pipelines, or filtration systems while allowing fast and safe access for maintenance. Unlike traditional bolted covers, it reduces opening time, improves safety, and minimizes downtime in industrial operations.
Q 2. What is a bandlock type quick opening closure?
A bandlock type quick opening closure uses a segmented locking ring or band that secures the door to the vessel. This design distributes pressure evenly around the circumference, ensuring high safety and reliability in high-pressure applications like oil & gas and petrochemical industries.
Q 3. What are the key features of quick opening closure design?
A well-engineered quick opening closure design includes:
- Locking mechanism (bandlock, clamp ring, or rotary lock)
- Safety interlock system to prevent opening under pressure
- Hinged door for easy handling
- High-performance sealing gasket
- Compliance with standards like ASME
These features ensure faster operation, enhanced safety, and long-term durability in industrial environments.
Q 4. Who are leading quick opening closure manufacturers?
Leading quick opening closure manufacturers specialize in high-pressure engineered solutions for industries like oil & gas, power, and petrochemicals. Companies offering custom-designed, ASME-compliant closures with certifications like ADNOC and EIL approvals are preferred for critical applications due to their proven safety and performance standards.
Q 5. What are ADNOC and EIL approved quick opening closures?
ADNOC approved quick opening closures and EIL approved quick opening closures refer to systems that meet strict engineering, safety, and quality standards set by:
- ADNOC (Abu Dhabi National Oil Company)
- EIL (Engineers India Limited)
These approvals ensure the closure is suitable for high-risk industrial environments, offering reliability, compliance, and operational safety in large-scale projects.
