Ductile iron covers and grates

Important Information

Wrekin is a British company and one of the UK’s leading suppliers of ductile iron access covers and gully grates.

Our 30 years of technical expertise and leadership have allowed us to develop a range of unique, innovative and patented products that give the specifier and contractor significant benefits.

Access covers and gully grates can be safety critical. In certain circumstances failure or misuse could lead to injury or loss of life. With this in mind Wrekin have developed products that incorporate features that help eliminate these failure mechanisms thus minimising safety issues and optimising installed life cost.

As well as optimising frame stiffness and rib positioning and design Wrekin have developed additional unique features and benefits:

ant-flex beam Anti-flex© beams – helps to eliminate at source one of the main causes of cover seating wear and therefore excessive noise and ultimately catastrophic failure.
framegrip symbol FrameGrip© – a mortar gripping system built into the underside of the frame that improves the bedding mortar grip to the frame reducing lateral shift and mortar breakdown.
Gully grate articulated cover linkage – a unique and patented articulated coupling links two double triangular units allowing the benefits of three point suspension with the advantages of single unit opening.
support symbol Specially designed cover support geometry – reduces movement relative to the frame and therefore seating wear.
Four flange symbol Specially designed frame flanges – help limit bedding mortar crack propagation.
keyway symbol Safety keyway – ensures key’s secure in keyway when lifting

  • The BSI Kitemark:

    As well as manufacturing its products under BS EN ISO 9001 quality system Wrekin’s high-performance access covers and gully grates are also independently tested and certified by the British Standards Institute and are thus able to carry the ‘Kitemark’ symbol.

    This third party certification is independent assurance that the product is manufactured and tested in accordance with BS EN 124:2015-2. A specifier or end user of an access cover or gully grate will wish to ensure as a minimum that all products used carry this symbol. You can check Wrekin’s Kitemark certificate here.

  • Comprehensive advantage:

    Wrekin manufactures a full range of other BS EN 124:2015 (and other British Standards where appropriate) access covers, gully grates, surface boxes and PPIC covers as well as other access and drainage solutions.

    They incorporate many design innovations and advantages and these are detailed in the range specific sections on the following pages. Learn more about the recent changes to the standards and regulations regarding manhole covers and gully grates without online CPD certified course here.

  • Materials – Ductile performance:

    Wrekin manufactures its high-performance range of products from Ductile Iron. This is a unique form of graphite-rich cast iron which has been treated before the casting process to produce an exceptionally strong and durable material with high impact resistance.

    It is also known as ductile cast iron, nodular cast iron, spheroidal graphite iron, spheroidal graphite cast iron and SG iron, discovered in 1943 by Keith MillisIt has a much superior strength to weight ratio than traditional grey cast iron.

    This combination of properties allows Wrekin to design and produce our innovative features and make significant weight savings that could not be achieved with less sophisticated materials.

  • How access covers are measured:

    Access cover dimensions are always referred to by their ‘clear opening size’ and sometimes also by their frame depth.

    The clear opening is the inside frame dimensions and these should normally be marked on the cover.
    If these are missing or have become illegible over time then it will be necessary to remove the cover and physically measure these dimensions.

    The clear opening size of the access cover frame must always be equal to or greater than the size of the chamber it is covering to ensure the frame is adequately supported.

  • Surface oxidation on ductile/grey iron castings:

    BS EN124-2 products are usually supplied coated. This coating is for initial aesthetic purposes only. It is not intended to function as a protection to the product’s parent cast ferrous material which is itself inherently corrosion resistant to normal UK climatic conditions and contaminants.

    Over time, when exposed to the atmosphere or the effects or trafficking, the coating will break down and light discoloration due to iron oxide deposits may become visible.

    This has no impact on the performance of the casting or its compliance with BS EN 124-2 and will soon disappear when in operation. If a painted finish is required, we advise painting with Hammerite® or similar paint with either a brush or roller.

    Surface Oxidation on Iron Castings

    3.02 MB | Version | PDF format