Grayloc® Clamp Connectors

Field-proven, compact, and lightweight alternative to conventional flanges.

Grayloc Clamp Connectors

Our trusted Clamp Connector design provides a simple-to-install solution that saves both space and weight across your operations. Delivering unparalleled design quality and reliability since the 1950s, our connectors feature metal-to-metal bore seal technology to meet your critical service piping and vessel connection requirements. The connectors’ light weight, smaller diameter, and shorter length support the design of optimized systems.

Metal to metal icon

Reduce installation time with quick and easy assembly

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Eliminate fugitive emissions

Reduce Maintenance 1

Reduce maintenance costs and spare parts inventory

Grayloc Clamp Connectors 2

Technical Specifications

Nominal pipe size½ to 64 in
Design pressure ratingFrom full vacuum up to 60,000 psig
Design temperature range-423 to 1700°F / -253 to 927°C
HubNickel 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
ClampNickel alloys, carbon, 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
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Product Variations

Typical Applications

  • Maintains sealing performance while withstanding the extreme pressure, temperature, and external load requirements of the most challenging testing and operational applications
  • Efficient and zero leakage connectors are ideal for the high pressures and temperatures found in biomass and renewable natural gas applications
  • Used in cryogenic applications to provide sealing performance that far exceeds conventional flanges
  • Clamps produced in accordance with food safety standards are available to enhance the capabilities of your food production facility
  • Extensive track record of use in hydrogen service across industries
  • Ensure safe, leak-free operation with difficult-to-seal services
  • Meet the highly challenging conditions imposed by molten salt applications
  • Superior design and sealing capabilities meet criteria for applications ranging from small scale testing to full scale power generation
  • Trusted components in hardware including reactors, heat transfer systems, and cooling systems
  • Easily integrated into original equipment manufacturer designs
  • Extensive industry track record of zero leak performance in high pressure systems
  • Easy assembly, minimal maintenance requirements, and superior performance compared to conventional flanges
  • Small footprint and easy installation support steam, oil, and water applications
  • Superior performance makes our connectors the preferred option in the most demanding refining applications including difficult to seal gases, extreme pressures, extreme temperatures, and thermal transients
  • Fewer studs and lower assembly torque enable superior sealing and quick installation
  • Meets pressure and temperature requirements of supercritical applications including heat transfer and extraction

  • Lower weight, compact design, and quick assembly times ideal for use in pressurized tidal energy applications

  • Offer significant opportunities for reduction of CAPEX and OPEX by saving space, weight, and time compared to conventional flanges

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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