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AS 3996 – Clause 1.1 Scope*
“This standard specifies requirements for access covers and grates for use in vehicular and pedestrian areas. It applies to access covers & grates having a clear opening of up to 1300mm, particularly to components manufactured from grey and ductile irons, cast and manufactured steels, aluminium and concrete. However, the use of other materials is not precluded."

NATA Certification
As part of ACO’s continuous product development and commitment to quality, ACO has NATA certified testing equipment (Licence no. 15193), operated by fully trained and certified technicians.

ACO's NATA test rig           

In practice, there are a number of key factors affecting a cover’s resistance to load:

   i) Type of traffic - pedestrians, cars, trucks, forklifts etc. crossing the cover. For trolleys and forklifts particularly, consider the weight of loads being carried.
  ii) Frequency of traffic - more frequent traffic may require a heavier load class.
  iii) Speed of traffic - fast moving traffic can intensify the load effect on the cover.
  iv) Position of cover - if the cover is positioned where traffic will be turning, braking or if the cover is installed at the bottom of a ramp, it will be subjected to extreme forces. Selecting the right cover and frame is essential.
  v) Wheel type - solid tyres exert loads through smaller contact areas than pneumatic tyres. A heavier duty cover may be required.

table of load classification

Note: In block paver areas, pavers can decrease the stated loading of the access cover.


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