SIL4 Interlocking Manifold for HIPPS Systems

Complete safety-certified system assembly for high integrity pressure protection

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What is a HIPPS?

A HIPPS (High Integrity Pressure Protection System) is a safety instrumented system used in the process industry to prevent line overpressures. The system promptly isolates the line through electronic devices that interact with the instrumentation, preventing damage caused by events that cannot be managed by normal operation or wrong action of the operator.

It is a fully automated system capable of mitigating potential hazards, providing economic advantages (saving manufacturing and maintenance costs), environmental advantages (reducing emissions), and safety advantages (eliminating human intervention).

✓ SIL4 Certified – The Highest Safety Level

Indra’s Interlocking Manifold meets IEC 61508 requirements for Safety Integrity Level 4, ensuring maximum protection and reliability in critical applications.

Technical Specifications

Connections

Threaded (ASME B1.20.1)
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

Enclosure

St.St. 316/316L, IP66 certified
Standard or custom dimensions
Optional: internal insulation, painting

Certifications

SIL 4 - TEC 61508
PED 2014/68/EU
ATEX 2014/34/EU
1P66 (with enclosure)
CRN for Canada
Fugitive Emission 15848-1 & 2
CU-TR for EAC Countries

Available Configurations

Choose the right configuration for your instrumentation requirements:

Protective Enclosure & Accessories

Heavy Duty Stainless Steel Enclosures

The interlocking manifold is supplied in a standard protective enclosure suitable for extreme environmental conditions (tropical, pluvial, and polar) to guarantee protection of the instrumentation from external atmospheric events and possible tampering.

Standard Configurations:

  • L1: 580mm W × 606mm D × 1310mm H (open) / 705mm H (closed)
  • L3: 780mm W × 606mm D × 1310mm H (open) / 705mm H (closed)

Special & Tailor-Made: Custom dimensions available to meet specific project requirements.

Available Accessories (ATEX, IECEx, ECAS Certified)

Junction Box

St.St. 316/316L, available Ex-ia or Ex-e certificated. Additional junction boxes can be mounted on the enclosure.

Proximity Switches

St.St. 316/316L, available Ex-ia or Ex-d certificated for position monitoring.

Self-Regulating Heater

St.St. 316/316L, Ex-ia or Ex-d certificated for special applications. Low Temperature Alarm and in-line thermostat also available.

Cable Glands

Available in St.St. 316/316L or NPB. Dual certification Ex-d/e.

Internal Insulation

Thermal insulation available on demand for extreme temperature applications.

Painting Treatment

Custom painting available for specific environmental requirements or client specifications.

Applications & Main References

Indra Interlocking Manifolds are deployed in critical installations worldwide:

Oil & Gas Offshore Platforms

North Sea, Middle East, Africa

FLNG Projects

Floating LNG production facilities

Gas Compression Stations

Pipeline pressure protection

Petrochemical Plants

Process safety systems

LNG Facilities

Liquefaction and regasification terminals

Refineries

Critical process isolation

Recent Major Projects

Indra has supplied Interlocking Manifolds for 460+ projects worldwide, including:
NMGL Project (Abu Dhabi, UAE) 1001 PT Configuration with flushing system
Coral North FLNG (Mozambique) 1001 configuration with ball valves and voting logic 2003
Dalma Gas Project (Abu Dhabi, UAE) Specially designed for HIPPS level with equalizing manifold
Belbazem Project (Abu Dhabi, UAE) 1001 configuration with flushing system
Multiple North Sea Platforms Various configurations for offshore installations

Engineered for Maximum Safety & Reliability

Indra’s SIL4 Interlocking Manifold represents the pinnacle of safety instrumentation for HIPPS systems. Manufactured entirely in-house at our Italian facility, each manifold is engineered and tested to meet the most stringent international safety standards, providing the highest level of protection available in the industry.

The integration of manifold, protective enclosure, and accessories into a complete system assembly eliminates compatibility concerns and reduces installation time. All components are manufactured from corrosion-resistant stainless steel 316/316L and certified for hazardous area applications with ATEX, IECEx, and ECAS approvals.

With proven performance in extreme environments—from offshore platforms in the North Sea to desert installations in the Middle East—Indra’s Interlocking Manifolds deliver reliable overpressure protection in the world’s most demanding applications. Our complete turnkey solution includes engineering support, custom configurations, and full documentation for safety compliance.

The modular design allows for flexible configurations (2oo3 single inlet, 2oo3 three common inlets, or 1oo1 triple redundant), while the IP66-rated enclosure protects against environmental hazards including extreme temperatures, humidity, and corrosive atmospheres. Optional accessories such as self-regulating heaters, proximity switches, and temperature monitoring ensure optimal performance across all operating conditions.