Specialist Ductile Iron Access Covers
Heavy-duty specialist ductile iron access covers for the most demanding applications: concrete infill multi-part covers and frames, continuous trench covers, solid top machine-seated covers, and solid top multi-part covers for large openings. All comply with the relevant British Standards and are proven in ports, airports, highways and industrial sites where standard covers won’t do.
Our technical team can help you specify the right configuration for large spans, unusual openings or extreme loadings.
An extensive range of ductile iron multi-part covers and frames, combining ductile iron covers with structural steel removable beams. Available lift out or slide out, and sealed where required to prevent ingress of water, dirt and debris. Ideal for data centres, ports, airports and large-scale infrastructure projects where full access to the chamber is needed.
When to specify a multi-part cover
A multi-part cover and frame is specified where a single cover will not do the job. Beyond a certain span a one-piece ductile iron cover becomes too heavy to handle safely, so the opening is divided into several covers.
The more important reason is full chamber access. Because the beams are removable, every cover and every beam can be taken out to leave a completely unobstructed opening — which matters when plant, pumps or switchgear have to be lifted in or out.
Slide out, lift out and machine seated
- Lift out — covers lift vertically clear of the frame. The simplest arrangement where there is headroom above the chamber.
- Slide out — covers slide horizontally across the frame seating, for locations with restricted overhead clearance.
- Machine seated — seating faces machined to a precise fit, giving a water-tight closure and even load transfer across the frame.
Removable beams
Covers seat on hot dip galvanised structural steel I-beams, which drop into ductile iron beam holders built into the frame. Sections range from 305 x 165 x 54kg/m up to 533 x 210 x 122kg/m, with two or more beams on larger openings.
Loading classes and sizes
Manufactured to BS EN 124-2:2015 in D400, E600 and F900. If you are unsure which applies, see our guide to BS EN 124 loading classes.
We publish 61 standard sizes, from 600 x 600mm to 5820 x 2400mm, in configurations from single covers to 24-part assemblies. Full clear opening, over base, frame height and beam section data is listed on each product page below.
Every Kitemarked product is load tested to 10% above the BS EN 124 requirement, under BSI Kitemark licence KM 789143. Standard sizes are held in Telford for nationwide delivery, and any size combination can be manufactured to order.
Explore other ranges
slow-moving traffic — hospitals, food manufacturing facilities, retail and public realm schemes — where drainage performance, hygiene
and appearance all matter.
Every grating is made to order in the UK, so openings, bar spacing, load requirements and locking options can be tailored to the project. Send us your drawings or dimensions for a fast quotation.
Choose D400 for highways and carriageways, E600 for docks, warehouses and heavy industrial zones, or F900 for ports, airports and areas of
extreme loading. Ductile iron’s high strength-to-weight ratio delivers exceptional durability with easier handling on site. Standard patterns held in stock for nationwide delivery; captive hinged and specialist options available.
Available ex-stock for immediate delivery.
Talk to us about loadings, seals and locking options for your specification.
Our technical team can help you specify the right configuration for large spans, unusual openings or extreme loadings.
Ask us about combining spring assistance with safety grilles and locking options.