Castings of Surface Boxes; Manhole Covers; Frames; Inspection Covers and Frames shall be of Grey Cast Iron.
All Castings are sound, homogeneous and free from sand, blow holes, chill, cold shuts, scab and other deleterious defects.
Castings are free or Warp after they have been dressed and fettled seat evenly without rocking.
Castings are capable of withstanding, without signs of fracture or permanent set the appropriate force as specified:
Heavy Duty: 135 (kn)
For use in carriageways and capable of bearing wheel loads of up to 12 metric tons.
Medium Duty: 40 (kn)
For use where heavy commercial vehicles have no access (e.g. domestic accesses, pavements, cycle tracts).
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