Frost Brochure Issue 03 - Catalog - Page 11
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Floor Drainage - Design Considerations
WEIGHT BEARING AND LOAD
RATING
As an integral part of the 昀氀oor it
is vital gratings and assemblies
withstand all anticipated loads.
This catalogue shows the load rating
class for each grating, cover or gully
assembly to BS EN 1253, as follows:
Loading K3 (Pedestrian Only)
Areas for foot tra昀昀ic only, such as
washrooms, shower areas, hotels,
schools, museums, retail centres,
swimming baths, leisure centres,
balconies, terraces and roof gardens.
Loading L15 (Light Industrial)
Areas with light vehicular tra昀昀ic such
as cycle ways and domestic drives.
Loading M125 (Heavy Industrial)
Areas with vehicular tra昀昀ic, such as
car parks, factories, warehouses and
workshops.
FLOW RATE
Flow rate is the maximum amount of
water (litres/second) which a gulley
will drain and is in昀氀uenced by several
factors such as grating free area (i.e.
gaps in the grating), sump capacity,
body free area, design of the gulley,
outlet size, and additional features
and accessories such as 昀椀lter buckets
and traps.
At low heads of water the 昀氀ow rate of
a gully is mainly governed by the size
of grating free area. At heads of water
above 50mm 昀氀ow rate is governed by
the body free area, or the grating free
area, whichever is the smaller.
Selected top size (i.e. grate free area),
gully outlet size and piping system size
all relate to each other and should be
within recognised parameters.
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