Multi-Part Covers

Typically, our standard multi-part covers are gas-tight and also considered water-tight. For sensitive applications specifically requiring a higher degree of water or gas tightness, specialised sealed designs can be engineered. Please specify this requirement at the time of enquiry.

Multi-part access covers are highly configurable and can be designed to span many metres. Based on our current capabilities, SVC can produce multi-part covers to suit a maximum length of 6100mm and a maximum span of 3250mm.

The system uses a fixed outer frame and removable support beams that lock into position. Smaller, individual cover panels are then placed on the beams to complete the surface, allowing sequential removal.

The clear opening refers to the size of the open space or void beneath a cover or grate, and typically matches the internal size of the pit chamber below. It is the most critical dimension when ordering pit covers.

Access covers and grates are usually larger than the clear opening size in order to sufficiently cover the pit beneath. It is important to note that any dimensions in the product descriptions typically refer to the nominal clear opening, not the external dimensions of the cover or grate itself. For specific product dimensions, SVC can provide technical datasheets or product drawings for accuracy.

Absolutely! SVC can supply ductile iron access covers and multi-part covers rated to Class D, E, and G, which are specifically designed, tested, and approved to withstand the loading requirements of highway and main road traffic. While we also supply ductile iron access covers with a Class B load rating, these are not compatible for road installation and should only be used in driveways or behind-kerb applications where they are suitable for slow-moving domestic traffic.

Ductile iron is significantly stronger and less brittle than traditional cast iron. This allows for more efficient designs with higher load ratings and a far greater resistance to cracking under repetitive traffic loads, increasing the durability and longevity of these heavy-duty access covers in the built environment.