CLARK DRAIN LTD
Suppliers of: Underground drainage, pipe, fittings, channels, gullys, inspection chambers, covers & frames, gully gratings, surface boxes, Linear drainage systems, drain mats, manhole lifters, Linear channel, Gully grate, Heavy duty channel, Domestic channel, Heavy du
Clark-Drain, formerly known as Clarksteel Ltd was founded in 1963. Clark-Drain offers a wide choice of high quality products in a variety of materials and includes Covers and Gratings, Linear Drainage Channel, Underground Pipes and Fittings, Security Covers and Bespoke Solutions.
At Clark-Drain we continue to invest in our technology and people here in the UK and worldwide as both our national and international business continues to expand.
It enables us to apply impressive resources to product updates, bespoke development, innovative design and of course, service excellence.
Even though we have become much larger we still retain our traditional values – meeting our customer needs by not compromising on quality and being focused on the best possible service and support.
Our cast iron covers and gully gratings meet the requirements of the European Standards BS EN 124 and provide innovative features designed to make them durable, safe and easy to install.
Our steel access covers and polypropylene covers offer solid top and pavior options in various sizes and loading capabilities suited to residential, commercial and industrial building and construction.
Clark-Drain have a wide range of thermoplastic, polymer concrete and polypropylene linear drainage systems to suit diverse applications. View our wide range of options to find the loading best suited to your project.
PVCU pipes and fittings, Polypropylene Inspection Chambers (PPIC) and bottle gulleys in a variety of sizes will precisely meet your underground needs.
Complete chamber access solutions delivering cable/utility access and network protection for various applications. Central to their design is their strength. It is why we supply them to meet the specific requirements of an installation in terms of ease of use and durability in use, as complete systems, ready to go in the ground.
Bespoke solutions can be designed in a way to suit a specific application and industry need. Clark-Drain is versatile and has a depth of product knowledge which can match your requirements with unparalleled flexibility.
Including highly secure access chambers and security lids, Clark-Drain’s products are widely used within the defence, retail security, CCTV, telecommunications and financial sectors.
Lifting keys, chamber reducers and build-in step irons make up just some of the Clark-Drain ancillary items
Further technical information, image galleries and product specifications are available through the Clark Drain Ltd website or via the BPI Download Library.
These files are provided by the manufacturer. While Building Products Index takes every care to ensure the information is correct and up to date, we cannot be held liable for any out of date or incorrect information in them. Please check with the supplier before specifying or purchasing products.
1. Clark Drain at A Glance
POLYMER CONCRETE LINEAR DRAINAGE, Polypropylene covers
Published [02/07/18]File size [6444 KB]
2. Clark Drain Underground Fittings
underground drainage fixtures and fittings offer cost-effective PVC and polypropylene systems
Published [02/07/18]File size [2149 KB]
3. Clark Drain Iron Castings
ductile Iron Castings
Published [02/07/18]File size [6239 KB]
4. Clark Drain Access Chamber Systems
Chamber Access Systems
Published [02/07/18]File size [1933 KB]
5. Clark Drain Linear Drainage
Linear Drainage - Stainless Steel Edged Channel Stainless Steel Slotted Grating
Published [02/07/18]File size [5649 KB]
B125 Access Chamber System
B125 Access Chamber System Access Chambers Inspection Chambers
Published [02/07/18]File size [5652 KB]
Clark Drain 300 Series Inspection Chamber
POLYPROPYLENE INSPECTION CHAMBER SERIES
Published [02/07/18]File size [2311 KB]
Clark Drain B125 Slideout Cover
MEDIUM DUTY COVER AND FRAME, THE B125 SLIDE OUT COVER, OFFERS AN ERGONOMIC DESIGN FOR USE IN PAVEMENTS, PEDESTRIAN AREAS AND DRIVEWAYS SUBJECT TO LIGHT VEHICULAR TRAFFIC.
Published [02/07/18]File size [1208 KB]
Clark Drain D400 Drainage Hinged Cover
ductile iron, the D400 hinged cover and frame
Published [02/07/18]File size [1479 KB]
Clark Drain D400 High Max Series Drainage
Published [02/07/18]File size [6117 KB]
Clark Drain Ductile Iron Technical Specification Brochure
ductile iron access covers and gratings
Published [02/07/18]File size [16090 KB]
Clark Drain Gully Grating Series
Published [02/07/18]File size [1494 KB]
Clark Drain High Performance Gully Grates
THE CLARK-DRAIN D400 HIGH MAX Gully Grates SERIES
Published [28/02/17]File size [627 KB]
Clark Drain Highways Sector Product Selector
HIGHWAYS, COMMERCIAL ACCESS AND ESTATE ROADS
Published [02/07/18]File size [4700 KB]
Clark Drain Precinct Access Cover
Precinct range of high quality access covers are ideally suited for use over telecommunications, CATV and electrical chambers that require secure, yet frequent and easy authorised access to below ground services.
Published [02/07/18]File size [4998 KB]
Clark Drain Road Gully With 180GG
450MM DIAMETER ROAD GULLIES
Published [28/02/17]File size [1423 KB]
Clark Drain Sino DUCTILE IRON COVERS
DUCTILE IRON COVERS, LINEAR DRAINAGE
Published [28/02/17]File size [4696 KB]
Clark Drain - Not all D400s are created equal
Not all D400s are created equal
Published 18 January 2019
Within our ductile iron manhole cover range Clark-Drain offers 3 types of D400 products. Each of these is intended for different applications but we are increasingly finding that the wrong type is chosen, with price often seemingly being the most influential factor.
A product compliant to EN124 D400 loading is merely making a statement about its static vertical loading capability under laboratory conditions, not that it is suitable for any location with any amount of road traffic. This is because in certain situations, such as roundabouts, road junctions, main roads, areas of high traffic density, etc., the dynamic loading effects exerted by vehicles passing over manhole covers either at high frequency and/or at speed means they are potentially subject to far greater stresses than other locations. This in turn can produce stress fatigue failures either in the manhole cover itself or more likely through the frame and to the bedding upon which it is sited. A product’s ability to resist a static vertical load of 400kN is only one small part of the equation of what goes into making a product suitable for a given application in terms of durability in service.
Ideally, we’d only offer one type of D400 cover in our range that was suitable for all locations, even if it was overkill for less demanding applications. However, in today’s cost-conscious market we have found the need to develop more competitively-priced products for those less demanding applications. Unfortunately we find that this leads to the wrong product being selected for the application on occasion, so to clarify:
Non-carriageway D400 products (e.g. CD 701 KMD, CD 1659 KMD, etc) = suitable for use in areas subjected to slow-moving vehicles only, including occasional HGV’s. Car-parks, cul-desacs, retail delivery areas, private access roads, etc. Not suitable for use in carriageways.
Carriageway D400 products (e.g. CD 701H KMD, CD 1659H KMD, etc) = suitable for use in carriageways subject to low-density traffic including HGV’s, fast or slow-moving.
Heavy-duty D400 products (e.g. CD 901H KMD, CD 902H KMD, etc) = suitable for use in carriageways subject to high-density traffic, fast or slow-moving.
Selection of the wrong product is likely to lead to an early failure of the manhole cover and/or bedding, meaning a costly on-site repair. A few pounds saved up front can therefore lead to great expense in the long run so if in doubt, always select the higher specification product.
We are occasionally called to construction sites where D400 products have failed. Whilst the product chosen and installed may be appropriate for the long-term intended use of the road, the fact that during construction a number of large site vehicles, often carrying large and unusual loads, will pass over the products is overlooked in the planning and specifying stages. Again, the dynamic loadings that such vehicles exert are far greater than their static mass would suggest. Accepted best-practice is to protect any ironwork from trafficking until all construction is completed, and this is what we also recommend, but as further caution consideration should be given to installing either a higher specification of D400 product (see above) or even an E600 product to avoid failure should the product be unintentionally trafficked by site vehicles.
Clark Drain - The great A15 debate
One of the most common queries we get as a drainage product and access cover manufacturer is - “can I use an A15 product on a driveway?” or (all too often) put another way - “I have an A15 product on my drive that’s broken, how come??”
The confusion is caused by interpretation of the A15 loading i.e. 1.5 tonnes. To the untrained eye this equates to less than the weight of their car so the incorrect conclusion is drawn that an A15 product is suitable for their driveway.
However, the static mass of a vehicle and the loads it exerts through its wheels to the ground is very much different to the dynamic loads applied when the same vehicle is turning and braking, as is often the case on driveways. In such circumstances the loads exerted are several times the level when static so even a small hatchback car with a static mass of, say, 1.2 tonnes will exert much more through its outside wheels when turning, and even more through its outside front wheel when braking at the same time. In extreme cases the load exerted through a single wheel can be 3 or 4 times the static mass of the car!
All of this was thought of by the committee of clever chaps who put together the load rating classification standards, and hence on initial glance each loading class seems to be over-specified but in reality they have been defined so as to accommodate the effects of dynamic loads that pedestrians, cycles, motorbikes, cars, vans and lorries exert when either moving at speed and/or turning & braking.
To conclude – an A15 product, is suitable for pedestrian areas only. For driveways B125 loading class is recommended as a minimum, and if the driveway in question is subject to occasional trafficking by dustbin lorries, delivery vehicles, removals vans, etc, then a C250 loading class product should be considered. If in doubt, install a higher loading class than you think!