Covers for manhole chambers, sewerage chambers, and adduction chambers
Covers for manhole chambers, sewerage chambers, and adduction chambers are separate products, which are assorted with the chambers according to the area of exploitation. These come in various shapes and sizes, the most popular being those of circular shape.
Classification according to EN124:2015 standard:
This standard is governing these products, each of the standard parts refer to a specific material used for manufacturing of the covers, as follows:
- Cast iron
- Steel and aluminium
One can find covers made of cast iron, concrete, composite, and plastics in TRIPLAST variety. The governing standard classifies the products in accordance with maximum allowed load. Coding is made using a capital letter and a number of two or three digits, as follows:
|Class||Maximum load [kN]||Area of use|
|A15||15||Green areas, without any traffic, pedestrian us only|
|B125||125||Pedestrian and parking areas for only light vehicles|
|C250||250||Industrial areas with slow moving traffic|
|D400||400||Traffic areas, including small vehicles and trucks|
|E600||600||Heavy load areas, such as fork-lift traffic zones, loading bays, e.a.|
|F900||900||Extremely heavy load areas, such as seaports and airports|
The clear opening is an important detail of any cover; this means the empty access space you see when you open the cover. The clear opening is abbreviated as CO in the standard. It depicts the maximum diametre of a circle you can draw in that space. Protrusions from frame elements might reduce the CO from the frame opening diametre.
The standard allows the covers to bear inscriptions, customer logo, municipality coat of arms, or other design elements, given that these comply with the surface conditions depicted within the appropriate chapter of the applicable part of the standard.
Covers sold by TRIPLAST are in compliance with EN 124:2015. Periodical quality assurance and control is carried out by NANDO notified certification body.