Grayloc clamp connectors and high-pressure piping assemblies

Grayloc clamp connectors: compact piping connectors, self-energized metal seal rings, compact flanges, non-slam nozzle check valves, and closure systems.

Grayloc: manufacturer of high-pressure connectors and clamp assemblies

Operating as an Oceaneering division, Grayloc Products has manufactured high-pressure piping connectors for over 60 years. Featuring metal-to-metal bore seals, these compact assemblies maintain leak-free integrity across cryogenic temperatures and extreme industrial fire scenarios.

International engineering division with advanced fabrication hubs in the US and UK
Industry benchmark for compact piping layouts replacing conventional heavy flanges
Elastic deflection of the metal seal ring generates a self-energized sealing barrier
Utilization of qualified alloys for cryogenic, petrochemical, and hydrogen pipelines

Grayloc Clamp Connectors with self-energized metal bore seal design

Grayloc Clamp Connectors incorporate two tapered hubs, a reusable metal seal ring, and a two- or three-piece clamp assembly secured by stud bolts. Reduced weight and outer dimensions simplify piping design, saving installation time and decreasing spare parts inventory requirements.

Weight and envelope reduction reaching 75 percent compared to conventional ANSI flanges
Rapid assembly achieved through two or four heavy-duty stud bolts instead of bolt circles
High resistance against cyclic bending moments, axial tension, and severe thermal shocks
Welding hub hubs engineered to match diverse standard and custom pipe wall schedules

Self-energized Grayloc Seal Rings engineered for critical process media

Grayloc Seal Rings are machined from high-strength corrosion-resistant alloys with precise lip geometry. As the clamp tightens, the tapered flexible lips deflect elastically against the inner hub sealing surfaces, establishing a dependable metal-to-metal pressure barrier.

T-shaped structural rib prevents excessive plastic deformation during makeup torquing
Internal process pressure energizes sealing lips for reinforced sealing reliability
Specialized anti-galling surface treatments including PTFE, molybdenum, and silver plate
Fabrication from stainless grades, 17-4PH alloys, Inconel grades, and duplex metallurgy

Grayloc Compact Flanges engineered for extreme operational temperatures

Grayloc Compact Flanges combine familiar bolted flange geometry with proven metal-to-metal bore seal technology. This integration eliminates soft gasket creep under extreme thermal cycles, reducing structural weight and footprint across offshore skids and petrochemical units.

Optimized flange disc geometry featuring reduced bolt circle diameters and lighter bolts
Elimination of soft polymer and graphite gaskets susceptible to thermal decomposition
Broad operating temperature envelope extending from cryogenic conditions up to 800 deg C
Direct compatibility with standard industrial piping specifications and tooling assets

Grayloc Non-Slam Nozzle Check Valves with dual-spring dynamic mechanism

Grayloc Non-Slam Nozzle Check Valves feature an aerodynamically contoured flow path and a responsive dual-spring architecture. Short disc stroke and light moving components ensure rapid non-slam closure before flow reversal, protecting rotating machinery from fluid shockwaves.

Rapid dynamic valve closure response eliminates destructive reverse flow and surge shock
Hydrodynamically streamlined internal profile ensuring minimal process pressure drops
Single-piece body construction eliminating external leak paths to protect environments
Dependable operation regardless of horizontal, vertical, or angled pipeline orientation

Grayloc Closure Systems for rapid access to pressurized process vessels

Grayloc Closure Systems provide rapid and safe access into industrial pressure vessels, filters, and scrubbers. Integrating Grayloc clamp connector components with balanced hinge mechanisms, these assemblies reduce opening and closure cycles to minutes without specialized tools.

Substantial reduction in maintenance downtime and labor during scheduled vessel turnarounds
Balanced hinge hardware enables effortless door opening and closing by a single technician
Integrated pressure interlock mechanisms prevent accidental opening under residual pressure
Horizontal and vertical installation configurations matching diverse process vessel designs

Technological evolution and engineering advantages of Grayloc assemblies

Engineered during the 1950s, Grayloc clamp connectors established an industry benchmark across high-pressure processing lines and critical fluid operations.

Compared to bulky ANSI/ASME or API bolted flanges utilizing flat composite gaskets, Grayloc connectors deploy an elastic metal bore seal ring ensuring leak-free performance under pipe deflections.

The product portfolio of Oceaneering's Grayloc Products division encompasses Clamp Connectors, compact flanges, non-slam nozzle check valves, rapid closure systems, and diverless subsea ROC units.

These components align with international pressure vessel design codes and are qualified for operation across temperature extremes from -196 to +800 deg C.

Operational physics of metal-to-metal sealing and seal ring profile

Dependable leak-tight performance across Grayloc connections relies upon a flexible metal seal ring featuring a T-shaped cross section.

During clamp makeup torquing, the tapered sealing bowls of both hubs elastically deflect the flexible ring lips, forming a continuous circular line of high-pressure metal-to-metal contact.

The central rib prevents over-compression of the sealing lips, while internal process media pressure acts directly within the internal diameter to energize the seal against the hubs.

To mitigate galling and surface friction during assembly, sealing surfaces receive specialized surface finishes including PTFE, molybdenum disulfide, or silver plating.

Grayloc Compact Flanges in modular plant design and weight reduction

When engineering offshore production platforms, floating LNG facilities, and modular processing skids, structural weight and space envelope govern piping decisions.

Grayloc Compact Flanges combine the familiar assembly advantages of conventional bolted connections with the compact dimensions of proprietary metal bore seals.

The compact geometry allows a substantial reduction in bolt circle diameter and flange ring thickness.

This design delivers weight savings reaching 60 to 75 percent over heavy ASME 2500 class configurations while maintaining full resistance against high bending moments, continuous vibration harmonics, and fluid pressure surges.

Hydrodynamic profile and dynamics of Non-Slam Nozzle Check Valves

To protect rotating machinery and pumping stations from destructive reverse surge waves, Grayloc engineered axial flow nozzle check valves.

The streamlined internal flow path shaped as a venturi nozzle minimizes pressure drops and eliminates turbulent vortex generation during high-velocity fluid and gas transmission.

A dual-spring dynamic mechanism guides a lightweight streamlined disc along a central spindle over a short stroke length. The valve closes smoothly before fluid velocity reverses, eliminating disc chatter, reducing piping vibration, and preventing shockwave damage across upstream process equipment.

Grayloc Closure Systems for rapid access to pressurized vessel units

Routine inspection and maintenance across process scrubbers, strainers, and pressure vessels require rapid opening of access covers. Grayloc Closure Systems replace time-consuming multi-bolt blinds with semi-automated clamp mechanisms supported by integrated counterbalanced hinge hardware.

An operator loosens two or four heavy-duty stud bolts, allowing the clamp segments to retract so the heavy door swings aside effortlessly without overhead crane support.

The assembly incorporates residual pressure interlock pins and visual indicators to prevent accidental opening prior to full vessel depressurization.

Remotely operated ROC units and Universal Ball Joint angular flexibility

For deepwater subsea field developments and hazardous facilities, Grayloc manufactures Remotely Operated Connectors (ROC). Integrating a precision screw mechanism into a three-piece clamp assembly enables work-class ROV manipulators to connect or release subsea flowlines within seconds.

To compensate for thermal expansion, storage tank foundation settling, and pipe angular offsets, Grayloc Universal Ball Joints deliver flexible pipe movement.

Available in Flexi-ball and Uni-ball configurations with Graphoil packing, these joints accommodate angular deflection up to 15 degrees under pressures reaching 1000 bar.

Grayloc and model names are trademarks of their respective owners and are used only to identify the equipment for which we source parts. SpareX is not an official dealer, distributor or representative of Grayloc and is not affiliated with the trademark owner. Origin, documents and warranty are stated for each item in the quotation.