The ONIS Quick Action Line Blind provides a safe, efficient, and easy-to-maintain solution for isolating pipelines during maintenance and inspection. With spreading technology and external seals, it reduces downtime, simplifies maintenance, and eliminates the need for complex disassembly or specialised tools.
Why positive isolation matters in pipeline safety
Isolating equipment for maintenance and inspection is crucial for ensuring pipeline safety and functionality. Positive isolation (or blinding activities) stops hazardous materials from entering a section of pipeline required to be shut down for maintenance, allowing workers to perform tasks safely while avoiding disruption to the rest of the pipeline system.
Traditional line blinds often require shutdowns, disassembly, and specialised equipment to maintain—leading to costly delays. The ONIS Quick Action Line Blind offers a modern alternative that simplifies the process and enhances operational efficiency.
What sets the ONIS Quick Action Line Blind apart?
The key difference in ONIS technology lies in its design.
Traditional Line Blinds
- Rely on non-spreading mechanisms with internal components.
- Internal seals are difficult to reach and replace.
- Maintenance requires full pipeline shutdowns and disassembly.
- Often involves cranes and heavy machinery.
ONIS Quick Action Line Blind
- Uses spreading technology, eliminating internal release mechanisms.
- Seals are external and easily accessible.
- Maintenance can be performed without pipeline shutdowns.
- No special tools or heavy equipment required.
This design reduces downtime, simplifies operation, and lowers costs for pipeline operators.
How to use the Quick Action Line Blind
Operation is straightforward and user-friendly:
- Actuation – Two forged half-bodies are actuated by a lever or hand wheel connected to a gearbox.
- Flange spreading – Synchronised eccentric shafts generate the spreading movement.
- Slide gate positioning – The slide gate moves into a full bore or blind position.
- Clamping – Reversing the lever or hand wheel locks the mechanism.
The clamping system is self-locking, resistant to overpressure and vibration, and factory-tested for reliability.
The equipment is factory-set and tested, eliminating the need for on-site adjustments after installation or operation.
Watch how it works
Simplified maintenance with external seals
One of the biggest advantages of ONIS Quick Action Line Blinds is their simplified maintenance process:
- Only four seals (two online, two offline).
- All seals are located externally for easy access.
- Seals can be replaced without pipeline shutdowns.
- No cranes or heavy equipment required.
- Typical replacement: once a year or when damaged.
This accessibility makes ONIS ideal for industries where extended shutdowns lead to high costs and production delays.
Key advantages over competitor line blinds
| Feature | ONIS Quick Action Line Blind | Traditional Line Blinds |
| Technology | Spreading design | Non-spreading internal mechanisms |
| Seal Access | External, easy to replace | Internal, difficult to access |
| Downtime | Minimal, no shutdown required | Requires shutdowns |
| Maintenance | Simple, no special tools required | Complex, heavy machinery often required |
| Reliability | Self-locking, vibration-resistant | Prone to wear and difficult to adjust |
Tried and tested isolation technology
ONIS, a French manufacturer with 40+ years of expertise, is the only provider of proven Quick Action Line Blinds for high-pressure applications. Their design combines reliability with operational efficiency, making it the preferred solution for industries including oil, gas, and petrochemicals.
By choosing ONIS, pipeline operators benefit from:
- Enhanced safety through positive isolation.
- Reduced downtime and faster maintenance.
- Long-term reliability in harsh operating conditions.
The ONIS Quick Action Line Blind offers a smarter way to achieve pipeline isolation during maintenance and inspection. With its spreading technology, external seals, and quick-action clamping system, ONIS helps operators save time, reduce costs, and improve safety.
Tremco Pipeline Equipment is the Australian, NZ and PNG agent for ONIS products. For more information, contact Brett Trembath on (07) 3344 1066 or email sales@tremcopipeline.com.au