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HIPPS

HIPPS (High-Integrity Pressure Protection System) is a safety instrumented system designed to prevent over-pressurization in industrial plants by automatically isolating pressure sources when unsafe conditions are detected.

These critical safety systems provide an alternative to traditional mechanical relief devices, offering faster response times and greater reliability in oil refineries, chemical plants, and other high-pressure processing facilities.

HIPPS Safety System

HIPPS represents the highest level of safety integrity for pressure protection, combining sensors, logic solvers, and final control elements to form a complete safety loop. When pressure exceeds predetermined safe limits, the system rapidly closes isolation valves to prevent equipment damage or hazardous releases. Unlike conventional pressure relief valves that vent excess pressure, HIPPS maintains process containment, making it ideal for handling toxic, flammable, or environmentally sensitive materials. These systems are designed to meet rigorous SIL (Safety Integrity Level) requirements, with redundant components and continuous self-testing to ensure maximum reliability.

Key Features of HIPPS

  • Safety Integrity: Designed to SIL 2 or SIL 3 standards (IEC 61508/61511) for maximum reliability
  • Rapid Response: Actuates within milliseconds to isolate pressure sources
  • Containment Protection: Maintains process containment rather than venting hazardous materials
  • Redundant Architecture: Typically 2oo3 (two-out-of-three) voting logic for fail-safe operation
  • Diagnostic Coverage: Continuous self-monitoring with >90% diagnostic coverage

System Components

A complete HIPPS consists of multiple integrated components working together to provide comprehensive overpressure protection:

Component Function Typical Specifications
Pressure Sensors Detect overpressure conditions Redundant transmitters, ±0.1% accuracy
Logic Solver Processes signals and initiates shutdown SIL 3 certified, 2oo3 voting
Isolation Valves Block flow when activated Ball or gate valves, <100ms closure
Diagnostic Module Continuous system health monitoring 90-99% diagnostic coverage
Alarm Panel Provides operator interface HMI with event logging

Industrial Applications

HIPPS are deployed in critical applications where conventional pressure relief is inadequate or undesirable:

  • Offshore Platforms: Protecting subsea pipelines and processing equipment from overpressure
  • Chemical Plants: Containing toxic or corrosive materials during upset conditions
  • Refineries: Safeguarding high-pressure distillation and cracking units
  • Gas Processing: Preventing overpressure in LNG trains and compression systems
  • Pharmaceutical: Protecting bioreactors and high-value production systems

Technical Specifications

Parameter Specification
Safety Integrity Level SIL 2 or SIL 3 (IEC 61508/61511)
Response Time <100ms to full closure
Pressure Range Up to 25,000 psi (1,725 bar)
Temperature Range -50°C to 450°C (-58°F to 842°F)
Voting Logic 1oo1, 1oo2, 2oo3 configurations
Certifications IEC 61508, IEC 61511, API 521, ASME
Materials Carbon steel, stainless steel, alloy materials
Communication Protocols HART, Modbus, Foundation Fieldbus, PROFIBUS

Advantages Over Traditional Relief Systems

  • Environmental Protection: Eliminates venting of hazardous materials to atmosphere
  • Process Efficiency: Maintains production continuity by preventing unnecessary shutdowns
  • Reduced Maintenance: Lower operating costs compared to relief valve maintenance
  • Regulatory Compliance: Meets stringent safety and environmental regulations
  • Space Savings: Compact footprint compared to relief valve systems

System Selection Considerations

  • Risk Assessment: Conduct thorough HAZOP/LOPA analysis to determine SIL requirements
  • Process Conditions: Evaluate maximum pressures, temperatures, and fluid properties
  • Valve Selection: Choose appropriate valve types (ball, gate, etc.) based on process requirements
  • Testing Protocol: Establish regular proof testing procedures to maintain SIL rating
  • Integration: Ensure compatibility with existing control and safety systems