|
Standard
Materials (Back
to top)
The
standard material is mild steel to EN 10025E-FE 430A/B. Hot dip
galvanised to BS EN ISO 1461 after fabrication
|
 |
|
Alternatives (Back
to top)
Stainless
steel to EN-58E grade 3041316 and aluminium to BS 435 grade 6063TF
other metals and combinations can be used.
Please
refer to our technical department for advice
|
|
Assisted
lift covers (Back
to top)
Where
ease and speed of opening is of prime importance, hinged units can
be provided with gas struts or torsion springs which as standard
are adjusted to partly lift the cover once it has been unlocked.
Complete opening of the cover and it's closure is then
accomplished under hand pressure.
The
pressure and type of gas struts used can be varied to fully open
the cover automatically when the locking mechanism has been
deactivated, requiring no hand pressure. The gas struts can be
adjusted on site if necessary.
|
|
Coatings
(Back to top)
Unless
specified otherwise all products will be galvanised to BS EN 1461
after fabrication. Alternative coatings can be applied to suit the
aesthetic or performance requirements of the location.
These
are typically epoxy resin coatings for spark protection or
resistance to corrosive atmospheres, or black bitumen coatings
where economy is the prime consideration. A wide variety of
coloured coatings can be applied to suit the appearance of the
installation. Again, please refer to our technical department for
the full range of options available.
Decorative
edgings (Back
to top)
Recessed
covers with the suffix BE or SE are available with high quality
3mm thick edging angle which is permanently and securely welded to
the frame and cover. This option is increasingly a requirement
where the cover and frame edge will be visible, and is
particularly suitable for terrazzo, marble, vinyl, carpet and
other high quality floor finishes. Brass (BE) or stainless steel
(SE) is used accordingly to suit the preferred colour scheme.
All brass and
stainless steel edged covers are locked with allen bolts of the
same colour as the edging strip and sealed as standard.
|
|
Fire
ratings (Back
to top)
Covers
can be supplied that are independently certified to the
requirements of BS476 part 20 1987 for fire exposures of up to
four hours. Other specifications according to the degree of fire
protection can be designed, please refer to us for further
details.
|
|
|
Hinged
Covers
(Back to top)
Units
can be manufactured with the cover permanently hinged to the
frame. This is often required for ease of handling and safety. All
hinged units incorporate a safety stay to secure the cover in the
open position
|
|
|
Sealing (Back
to top)
Our
standard method of sealing using high quality neoprene rubber will
effectively and economically limit the egress of odours and gasses
under ambient pressure from within the chamber or duct. This
method will also result in the limitation of water ingress from
above the chamber from run off water generated by washdown and
rainfall. For further advice, please refer to our technical
department
|
|
|
Locking (Back
to top)
Recessed
Covers
Locked
covers, unless specified otherwise will have as standard, allen
bolts to ensure a degree of security to prevent unwanted removal
of the cover. For sensitive locations where the prevention of
unauthorised removal is of prime importance, a variety of security
fixings can be specified which rely upon removal by a special
tool.
Solid
Top Covers
Solid
top covers, unless specified otherwise will have as standard
stainless steel machine screws to ensure a degree of security to
prevent unwanted removal of the cover. For sensitive locations
where the prevention of unauthorised removal is of prime
importance, a variety of security fixings can be specified which
rely upon removal by a special tool.
Hinged
Covers
Dependant
upon specification hinged covers can be locked by machine screws
(solid top) allen head bolts (recessed) or turnbuckle locks
(either).
For
the complete range of fittings please refer to our technical
office.
|
|
Keyways
(Back
to top)
Unless
specified otherwise, covers above 450mm long have 4 no. lifting
points (below 450, 2no.).
Covers
for concrete infill
All
non locked non decorative edged covers
Section
type R/R, DS
Type 1
Section
type P
Type 5
All
locked non decorative edged covers
Type 2
All
decorative edged covers locked as standard
Type 3
(alternatively
Type 4 if required). Bosses and gussets in
the same material as the edging.
|
|
|
Covers
for pavior infill
All
non locked non decorative edged covers
Type 5
All
locked non decorative edged covers
Type 4
All
decorative edged covers locked as standard
Type 4
(in
the same material as the edging).
|
|
|
Solid
top covers
Type 6
For
sealed covers a "cup" is welded on the underside to
close the keyway
|
|
|