Frost A5 Brochure final LR singles - Flipbook - Page 14
Floor Drains - Design Considerations
Factors including size, shape,
appearance and anticipated drainage
requirements need to be taken
into account in planning effective
drainage solutions. Design is usually
the responsibility of consulting
engineers familiar with the floor
construction, floor finish, piping
systems, operations and function
intended for particular building areas.
BUILDING REGULATIONS /
International regulations and local
building codes must be observed
for all sanitary and other drainage
installations so it is recommended
these are considered as the first step.
As a matter of good practice drains
should be considered for any
location where water is supplied
or where surface drainage must be
To prevent foul air from entering a
building a trapped gully may be used
and various types are available Bell,
Bottle, P and S. In other cases a nontrapped gulley may be used with a
trap installed in the drain line.
WEIGHT BEARING AND LOAD
As an integral part of the floor it
is vital gratings and assemblies
withstand all anticipated loads.
This catalogue shows the load rating
class for each grating, cover or gully
assembly based on BS EN 1253, as
Loading K3 (Pedestrian Only)
Areas for foot traffic 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 traffic such
as cycle ways and domestic drives.
Loading M125 (Heavy Industrial)
Areas with vehicular traffic, such as
car parks, factories, warehouses and
Flow rate is the maximum amount of
water (litres/second) which a gulley
will drain and is influenced 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 filter buckets
At low heads of water the flow rate of
a gully is mainly governed by the size
of grating free area. At heads of water
above 50mm flow rate is governed by
the body free area, or the grating free
area, whichever is the smaller.