Grayloc® Compact Flanges

Efficient, compact, and lightweight alternative that outperforms conventional flanges.


Our Compact Flanges integrate field-proven, metal-to-metal bore seal technology into a conventional flange layout to deliver robust, leak-free connectors suitable for extreme temperatures and pressures. The flange’s geometry, lightweight design, and small footprint enable you to optimize system design and reduce costs while benefiting from ease of installation and maintenance.


Eliminate fugitive emissions


Reduce installation time


Decrease maintenance costs and inventory requirements


Technical Specifications

Nominal pipe size½ to 82 in
Design pressure ratingFrom full vacuum up to 48,000 psig
Design temperature range-423 to 1500°F / -253 to 815°C
Compact FlangeNickel alloys, carbon, low-alloy, stainless and duplex stainless steels
Seal RingNickel alloys, low-alloy, stainless and duplex stainless steels
BoltingNickel alloys, low-alloy, stainless and duplex stainless steels
ASME B31.1, Power Piping
ASME B31.3, Process Piping
ASME B31.4, Pipeline Transportation Systems for Liquids and Slurries
ASME B31.8, Gas Transmission and Distribution Piping
ASME B31.12, Hydrogen Piping & Pipelines
ASME Section I
ASME Section VIII Div. 1
ASME Section VIII Div. 2
ASME Section VIII Div. 3
API 6A: Specification for Wellhead and Christmas Tree Equipment

Product Documents

Typical Applications

  • Maintains sealing performance while withstanding the extreme pressure, temperature, and external load requirements of the most challenging testing and operational applications
  • Eliminates fugitive emissions in addition to reducing the size and weight of your facility
  • Supports high-temperature and high-pressure applications
  • Ensures no leakage and eliminates fugitive emissions
  • Superior sealing capability and easier and quicker to assemble than conventional flanges
  • Reduces risks with expedited assembly times
  • Smaller, lightweight footprint enables optimized system design
  • Superior sealing capabilities eliminate fugitive emissions and associated unplanned outages
  • Smaller, lightweight footprint enables optimized system design
  • Quick assembly time saves cost in initial integration and future plant maintenance
  • Easily integrated into original equipment manufacturer designs
  • Available in large diameters to support integration with transmission pipelines
  • Improves the reliability of transmission infrastructure with highly resistant seal and zero leakage
  • Supports hydrocarbon, steam, and other difficult to seal services
  • Reduces space requirements with lightweight design
  • Improves sealing performance for critical applications including hydrogen production and refining

Field Inspection and Maintenance Services

Grayloc offers on-site inspection and maintenance services to ensure the integrity of our connectors and to facilitate the return of worn or damaged hubs to within factory specifications.

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