30 Pipe with protective sheath PE sheathed pipe systems for specific applications and alternative installation methods When Extena became part of egeplast, we also became experts in multilayer pipe systems, with an extensive range of sheathed pipes for different applications and alternative installation methods. Two sheathed pipes with different functions Our multilayer pipes are based on our standard pipes and are made of PE100 RC. We then add different types of layers onto this main pipe to create pipes with unique properties. The basic model in the multilayer range is the SLM® 3.0, which is fitted with a strong and extra thick sheath. Based on this pipe, we have also developed the SLM® DCT with built-in function test and additional reinforcement for extra high pressure. SLM® 3.0 and SLM DCT® are part of the latest generation of protective multilayer pipe systems. When installed using alternative pipelaying methods, these systems provide a pipeline network with the safest possible installation and long service life. Both SLM® 3.0 and SLM DCT® meet the requirements of PAS 1075 Type 3 (pipes with a higher strength sheath). PEplus sheath for maximum resistance Using a sheath protects the pipe in alternative installation methods such as directional drilling, pipe splitting and relining. Extena’s sheathed pipes have an extra thick PEplus sheath that represents 20-30% of the pipe’s total wall thickness in dimensions up to 355 mm (SDR17). In dimensions over 355 mm, the thickness is a slightly lower percentage, but the thickness of the sheath in mm is in fact larger. This provides a safe installation and extra protection against scratches. Remember that there is a wealth of pipe systems with thin polypropylene sheaths. These must not be confused with our high strength PEplus sheaths, which offer significantly better protection. PEplus is a patented HD-PE with a higher molecular weight that makes the coating more scratch resistant compared to conventional grades. We have chosen this durable, scratch resistant and high density material because the sheath is only a protective layer that is not included in the dimension of the pipe. Tough tests have shown that our PEplus sheath offers 60% less wear on the outer layer of the pipe compared to a polypropylene sheath. SLM® 3.0 Standard pipe made of PE100 RC fitted with a protective PEplus sheath. SLM® 3.0 is easier to use, easier to weld and is a safe and more reliable pipe system. SLM® 3.0 is a standard pipe made of PE100 RC fitted with a high strength sheath (coat) on the outside of the pipe, providing extra protection against scratches and damage that may occur during pipelaying. The pipe’s high strength sheath is made of PEplus, with a thickness, in the case of dim 250 mm/SDR17, corresponding to 25% of the pipe’s wall thickness. Since the sheath is made of polyethylene, it does not need to be removed during butt welding (SLM® 3.0) but can be integrated into the joint, reducing the risk of the sheath being ripped off when performing alternative installation methods such as directional drilling and pipe splitting or when extraction hoods are used. SLM® 3.0 meets the requirements of PAS 1075 Type 3. The sheath is welded in the bead – it cannot be ripped off Since SLM® 3.0 and its sheath are manufactured from the same basic material, i.e. polyethylene, the sheath can be butt welded in the bead. The different layers are then joined together in the weld bead (the sheath merges with the main material), which prevents the sheath from being ripped off during directional drilling or horizontal drawing, etc. when an extraction hood is used. In the case of SLM® DCT, this pipe must be stripped when welding, as it has additional layers of other material. SLM® 3.0 with a high strength PEplus sheath.
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