2oo3 Interlocking Manifold
Complete system-level redundancy for ultimate safety integrity
What is 2oo3 Voting Logic?
The 2oo3 (2-out-of-3) configuration is a redundant safety architecture where the system requires at least two out of three independent sensors to detect a hazardous condition before initiating a shutdown. This voting logic provides optimal balance between safety and availability.
Unlike single-sensor systems that can cause spurious trips or fail dangerously, the 2oo3 architecture tolerates a single sensor failure while maintaining full safety protection. If one sensor fails or provides a false reading, the system continues normal operation while alerting operators to the fault.
Key principle: Two independent confirmations are required for shutdown, eliminating false trips while ensuring that a single point failure cannot compromise safety.
✓ Optimal balance: maximum safety with minimal spurious trips
Technical Specifications
- Voting Logic
2-out-of-3 (2oo3) redundant configuration
- Voting Logic
Available Configurations
- Connections
Threaded (ASME B1.20.1)
Flanged (ASME B16.5 / API 6A)- Connections
Flanged (ASME B16.5 / API 6A)
- Bore Size
8 mm | 10 mm
- Pressure Rating
6,000 PSI (420 bar) | 10,000 PSI (690 bar)
- Seal Options
Standard: PTFE
Optional: Graphite- Material
Stainless Steel 316/316L, Duplex, Alloy 625, Alloy 825, Hastelloy, Titanium, 6Mo, Monel 400
All materials NACE MR0175/ISO 15156 compliant- Certification
SIL 4 - IEC 61508 certified (each assembly)
Unlike the 1oo1 arrangement, the 2oo3 configuration is supplied as a single integrated assembly housed within one enclosure, complete with manifold and specified accessories for simplified installation and maintenance.
Key Features
Fault Tolerance
DBB (Double Block & Bleed)
Spurious Trip Reduction
SIL 4 Certified
System Configuration
Complete Set Includes
Assembly A: 2003 manifold + enclosure + accessories
Assembly B: 2003 manifold + enclosure + accessories
Assembly C: 2003 manifold + enclosure + accessories
Note: Each assembly operates independently. External logic solver required to implement 2oo3 voting algorithm across the three channels.
| Feature | 2oo3 Configuration | 1oo1 (Set of 3) |
|---|---|---|
| Architecture | Single manifold, 3 sensors | 3 independent assemblies |
| Voting Logic | Integrated 2-out-of-3 | External logic controller required |
| Footprint | Compact, single enclosure | Three separate enclosures |
| Installation | Single tapping piping point | Triple tapping piping points |
| Best For | Space-constrained panels | Geographically distributed sensing |
| Redundancy Level | Sensor-level redundancy | Full system redundancy |
Need complete system redundancy?
Explore our 1oo1 Triple Redundant configuration for applications requiring full isolation between voting channels.
Typical Applications
Offshore Platform HIPPS
Space-constrained topsides where panel footprint is critical
Subsea Wellhead Protection
Compact enclosures for underwater or seabed installations
Gas Compression Stations
Pipeline overpressure protection with high availability requirements
LNG Terminal Safety Systems
Critical shutdown systems requiring fault tolerance
Refinery Process Units
High-pressure vessel protection with minimal spurious trip tolerance
FPSO Production Systems
Integrated safety systems with limited installation space
Need a more compact solution?
Explore our 1oo1 Configuration for integrated voting logic in a single manifold assembly.
