Drainfast Brochure Issue 36 - Flipbook - Page 44
1 MANHOLE COVERS & FRAMES
Size
The size listed is usually the size of the clear opening of
the manhole. For example, a manhole cover listed as 600 x
450mm will probably have a larger dimension including the
frame. Tempting though it may be to use a cover far larger than
the hole, it is best practice to source a cover that is a good size
match. A manhole cover that’s too small could fall in.
Types of manhole covers
Ductile iron
Solid and reliable, ductile iron will not corrode as quickly as cast iron, nor is it as
brittle. Ductile iron is stronger than cast iron too. The loading classes for ductile
iron manhole covers are subject to BS EN 124:2015 regulations.
Recessed/screed
These covers have recessed areas suitable for laying block paving or a layer
of screed – great for decorative finishes in driveways. The loading classes for
recessed covers are rated to FACTA loading specifications.
Solid top
Lighter galvanised steel manholes, often fitting flush at ground level and have
inset grab handles. Usually for lighter use. Weight classes for solid top covers are
subject to BS EN 124:2015 regulations.
Manhole cover weight classes
Weight classifications for manholes are as follows:
Covers subject to BS EN 124:2015 regulations are rated A15 to F900 –
A15
B125
C250
D400
E600
F900
Covers rated by FACTA are listed from FACTA A to FACTA F –
FACTA A
–
FACTA AA –
FACTA AAA –
FACTA B
–
FACTA C –
FACTA D –
FACTA E
–
FACTA F
–
Pedestrian use and up to 5kN wheel loads
Small vehicles up to 15kN wheel loads
Cars up to 25kN wheel loads
Cars and vans up to 50kN wheel loads
Trucks up to 65kN wheel loads
Articulated lorries up to 108kN wheel loads
Heavy, moving plant up to 158kN wheel loads
Aircraft and heavy plant up to 237kN wheel loads
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