All handling of cable ducts and loose protected microducts must be in accordance with Danish Standards DS 430 “code of practice for trenching of underground fl exible pipelines of plastic”. The following guidelines highlight a range of important aspects within these areas:
- Transport 2. Reception 3. Storage 4. Laying 5. Disposal
- Transport Transport, loading and unloading are all very important factors in ensuring the quality of the ducts. In the contexts of transport and storage, it is essential to take into account the relative softness and flexibility of the duct material to prevent the ducts from becoming deformed and/or damaged.
1.1 Ducts in set lengths
We recommend handling the ducts for as long as possible in the packed bundles in which they are supplied. Ducts in set lengths should be loaded and unloaded with a forklift truck, with a crane, or manually by two people. The ducts must never be tipped off or thrown from the vehicle. In the case of manual handling, make sure that the ducts are never dragged along asphalt or other rough surfaces. For transport on lorries, the following conditions must be observed:
- When they are not bundled, the ducts must not overhang the rear edge of the lorry bed by more than 1 metre.
- For bundled ducts in wooden frames, the rearmost frame must lie on the lorry bed.
1.2 Ducts in rolls on drums
A forklift truck must always be used to move, load and unload ducts on drums. The truck operator must make sure to lift and carry the drums by their wooden frames. The drums must not be dropped from heights and must not be rolled over sharp objects. When loaded onto a lorry bed, each drum must always be securely chocked in place, and the drums must be positioned flange against flange. Each and every drum must be secured using transport straps. Ducts in coils are transported on pallets. The pallets may be stacked in two layers.
On receipt of ducts, all material should be checked as the responsibility is normally transferred to the receiver upon delivery.
The ducts must be stored on a level surface without sharp edges and/ or stones. During storage and transport, the ducts must be positioned flat and appropriately supported such that they are not subjected to unnecessary deformation. The surface may, for example, comprise of wooden battens spaced no more than 2 metres apart. The ducts must be stored in such a way that they are guarded against deformation and are not subjected to damaging influences. The ducts should not be stored in locations where they are subjected to direct sunlight for protracted periods, as this may cause the material to deteriorate. Nor should the ducts be allowed to come into contact with chemicals which may cause them to deteriorate. The maximum permitted storage period for ducts is one year. Coils of duct must be stored lying down.
Cable ducts, pressure ducts and loose protected microducts must all be laid in accordance with Danish Standards DS 430 “Code of practice for trenching of underground flexible pipelines of plastic” and DS 475 ”Code of practice for the laying of underground flexible pipelines of plastic”.
The disposal of remainders of micro-ducts of any length (which may be polluted with soil, mud and/or other impurities) and of complete products is the responsibility of the duct manufacturer – in this case Emtelle Scandinavia. Alternatively, responsibility can be exercised via a company with the facilities for such disposal. Customers may return small volumes to Emtelle Scandinavia in Sdr. Felding, Denmark. For larger volumes (3000 metres or more), it is best to collect all used and/ or unused micro-ducts in a single location close to a three-phase 380 V power supply. NB! Temperature-related expansion and contraction of micro-ducts may occur. Emtelle Scandinavia therefore recommends laying 1 metre of extra micro-duct in each hand hole.