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    • Gas Quads & Cylinders

    Gas Quads & Cylinders

    Gas Quads & Cylinders are essential for storing and supplying breathable air and other gases in diving operations. This category includes steel gas cylinders, carbon composite cylinders and cylinder quads. Together, these products ensure a safe and continuous supply of gas, supporting the needs of commercial diving operations.

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    Frequently Asked Questions

    A gas quad, frequently referred to as a gas rack, is a robust, portable steel structure designed to house multiple high-pressure cylinders. In commercial diving, these quads provide a massive, centralised supply of breathing gases such as compressed air, pure oxygen, or mixed gases like Heliox. By linking 12 to 16 large cylinders together, quads deliver a continuous, high-volume gas supply to the dive control panel, drastically reducing the need for the surface crew to constantly swap out individual tanks during long operations.

    The most common configuration utilises heavy-duty steel cylinders, typically with a 50-litre capacity, engineered to withstand working pressures of 200 to 300 bar. However, modern offshore operations are increasingly adopting carbon composite cylinders. Carbon composite offers the exact same high-pressure storage capacity but weighs significantly less than traditional steel. This weight reduction is incredibly valuable on smaller dive support vessels where total deck payload capacity is strictly limited.

    A manifold is a complex arrangement of high-pressure pipes and valves that securely connects the outlets of all individual cylinders within the quad into a single, unified delivery point. This engineered design allows the dive supervisor or life-support technician to draw breathing gas from the entire bank simultaneously. Drawing from a manifold ensures a uniform pressure drop across all cylinders, prevents isolated freezing of valves, and guarantees a smooth, uninterrupted flow of vital breathing gas down to the divers.

    Because they operate continuously under immense pressure in highly corrosive saltwater environments, gas quads and individual cylinders are subject to strict legal testing requirements. The cylinders themselves must undergo scheduled visual inspections and full hydrostatic pressure testing every few years to confirm they have not structurally weakened. The external lifting frame, manifold hoses, and lifting slings must carry current, highly traceable inspection certificates to comply with offshore health and safety protocols before they are legally allowed to be lifted onto a vessel.