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Cryogenic Breakaway Couplings

  • We’re the only safety breakaway coupling manufacturer with over 30 years of proven experience of handling the risks associated with working with cryogenic liquids. 

    The implications of a driveaway incident on a cryogenic application can be very serious. Not only is there a risk of cold burns from the liquid and gas, but there are also other serious risks such as that of fire damage and explosion resulting from the uncontrolled release of oxygen and asphyxiation of personnel resulting from the depletion of oxygen levels in the boarding area produced by the release of gases such as nitrogen.

    Our cryogenic breakaway couplings can help reduce the risks associated with driveaway incidents and provide peace of mind for your business and your employees.

    Testing and cleaning for oxygen service

    APC have comprehensive on-site oxygen cleaning facilities to ensure that the couplings are supplied in the ultra-clean condition demanded by all industrial gases companies. Inspection is carried by ultraviolet light to expose any evidence of moisture, oil, grease, cleaning agents, flux or any other matter that may be present. All cryogenic breakaway couplings are rigorously pressure-tested with nitrogen gas prior to tagging, packaging and despatch. 

    For more details and free application evaluation contact us.

  • The breakaway coupling is normally flanged onto the terminal pipe-work at one end and at the other end to a flexible loading hose allowing free flow of product in both directions.


    During a driveaway or towaway incident, the flexible loading hose comes into tension, transmitting the load to the breakaway coupling which causes the pre-determined break bolts to snap, allowing the coupling halves to separate. Each half of the coupling seals immediately preventing major product spillage.


  • Reliable operation
    The simple design of the coupling ensures reliable operation even in the most demanding operations.

    Positive shut off
    Unidirectional valve motion without complex mechanisms.

    Proven design
    Over 30 years’ field experience.

    Accurate break loads engineered to specific applications.

    Unique design break bolts
    Break bolts designed to prevent easy substitution of a standard nut and bolt, providing increased safety.

    Flanges are integrally cast and can be finished to customer requirements. There are no pressure containing welds in the construction.

    Range of applications
    Supplied to major industrial gases companies throughout the world.

    Obtainable records
    Impeccable records retention to ensure correct spares are supplied when required.

    Spare parts
    Spare parts held in stock.

    Product trials
    Numerous actual product trials at customer sites have over the years proved beyond doubt the effectiveness of the APC couplings compared to other designs.

    Manufacturing quality
    Manufactured to the highest quality control standard: QA system ISO 9001 2008 approved.

    CE marked to PED 97/23/EC

  • Cryogenic breakaway couplings applications:

    • Road tanker loading and unloading

    • Rail tanker loading and unloading

    • Process product transfer.

     Products handled include:

    • Liquefied gases: LNG, liquid oxygen, liquid nitrogen, liquid argon and liquid carbon dioxide.

  • Sizes
    1" to 4" or metric equivalents.

    Main body construction
    Standard material: stainless steel 316.

    Threaded and flanged variations, 1 1/2" to 4” to most standards including ANSI, BS, DIN, ISO and JIS.


    Break bolts calculated to suit each individual application.

    Coupling designed for bi-directional flow.

    Temperature range
    -196˚C to 100˚C.

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