Support

At Clark-Drain, we believe that service does not simply begin and end with your order. We pride ourselves on the technical information we provide. Below you will find links to a download area with all of our technical documents, product literature, industry articles, frequently asked questions and videos.

High Max Installation

300 PPIC chamber assembly

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CD D600H-DS Technical Specification
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FILE SIZE 103kb
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Technical Specification

CD D930J-DSL Technical Specification
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Technical specification

Technodrain linear drainage brochure
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This product selection brochure is designed to provide useful information about Technodrain, our High Density Polyethylene (HD-PE) linear drainage including main features, application options, sizes and accredited loadings. The brochure eases product selection, whilst providing the technical details for specifiers, installers and end-users to make informed accurate decisions.

Our Frequently Asked QuestionsView all FAQs

I'm installing a 450mm manhole cover over an inspection chamber and the depth is over 1.2m. What shall I do?

Use the CD 499 Reducer. This fits under all our polypropylene 450mm diameter inspection covers and will reduce the clear opening to 350mm, thus complying with building regulations.

I'm fitting a cover on a 450mm inspection chamber in my driveway/garden and do not know which one to use. Can you advise?

We recommend using our CD 452 Polypropylene cover & frame, which complies with Part H of the Building Regulations 2010.

What products should I install in a driveway?

Clark-Drain recommends B125 covers as a minimum specification for driveway use. A15 covers are for use in pedestrian areas only and should not be used in driveways. Further detailed advice can be found in our catalogues.

How do I know what size manhole cover I need?

All manhole cover sizes are measured by the clear opening inside the frame as this is the only true constant between manufacturer's designs.

Do forklifts require a different loading class to vehicles fitted with pneumatic tyres?

Forklift trucks generally have smaller diameter tyres, with a smaller contact area, than road going vehicles.

Calculations show that they apply at least 4 times the load of a 10 Tonne lorry, along with extra dynamic forces due to solid tyres, limited suspension etc.

Clark-Drain recommends the use of our forklift rated covers for use in all forklift loading areas.

The pavior cover I had installed a while ago is bowing. Why is this?

This might happen if our installation guidelines have not been followed and the block paviors surrounding the frame were laid on sand only rather than mortar. In this scenario, it is possible for the sand under the paviors and around the frame to work loose, thus reducing support and potentially allowing the cover and frame to bow. Provided the problem is addressed early enough, and assuming that no abnormally heavy vehicles have driven over the cover, it should be possible to effect a repair. Remove the blocks and the cover & frame and reinstall them all on a bed of weak-mix mortar.

Refer to our installation guides for further information.

I'm installing a 450mm manhole cover over an inspection chamber and the depth is over 1.2m. What shall I do?

Use the CD 499 Reducer. This fits under all our polypropylene 450mm diameter inspection covers and will reduce the clear opening to 350mm, thus complying with building regulations.

How do I know what size manhole cover I need?

All manhole cover sizes are measured by the clear opening inside the frame as this is the only true constant between manufacturer's designs.

I'm fitting a cover on a 450mm inspection chamber in my driveway/garden and do not know which one to use. Can you advise?

We recommend using our CD 452 Polypropylene cover & frame, which complies with Part H of the Building Regulations 2010.

Do forklifts require a different loading class to vehicles fitted with pneumatic tyres?

Forklift trucks generally have smaller diameter tyres, with a smaller contact area, than road going vehicles.

Calculations show that they apply at least 4 times the load of a 10 Tonne lorry, along with extra dynamic forces due to solid tyres, limited suspension etc.

Clark-Drain recommends the use of our forklift rated covers for use in all forklift loading areas.

What products should I install in a driveway?

Clark-Drain recommends B125 covers as a minimum specification for driveway use. A15 covers are for use in pedestrian areas only and should not be used in driveways. Further detailed advice can be found in our catalogues.

The pavior cover I had installed a while ago is bowing. Why is this?

This might happen if our installation guidelines have not been followed and the block paviors surrounding the frame were laid on sand only rather than mortar. In this scenario, it is possible for the sand under the paviors and around the frame to work loose, thus reducing support and potentially allowing the cover and frame to bow. Provided the problem is addressed early enough, and assuming that no abnormally heavy vehicles have driven over the cover, it should be possible to effect a repair. Remove the blocks and the cover & frame and reinstall them all on a bed of weak-mix mortar.

Refer to our installation guides for further information.

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