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Type of coating
Epoxy resin primer
The PE adhesibe can be applied in powder form.The minimun layer thickness is 60μm.The thickness shall be monitored in accordance with DIN EN ISO 2808,Method 1A.
PE adhesive
The PE adhesive can be applied in power form or extruded.The minimun layer thickness is 140μm.The thickness shall be monitored is accordance with DIN EN ISO 2808,Method 1A.The peel strength requirements vary depending on whether the adhesive was applied as a power or was extruded.
Polyethylene coating
The polyethylene coating is applied either by sintering or by sleeve or sheet extrusion.The coating is to be cooled after application to avoid unwanted deformation during transport.Depending on the nominal size,there are different minimun values for the normal total coating thickness(n).In the case of increased mechanical loads(during transport,storage,installation,and as regards specific mass,stricter requirements) the minimum layer thickness shall be increased by 0.7mm(in which case the thickness is indicated by "v" for verstarkt). Minimum layer thickness are given in Table 3 below. Greater,special thickness may be agreed and are indicated by the letter"s".The total thickness (coating system thickness)is to be determined in accordance with AnnexA.
Guideline values for the total thickness of the polyethylene coating system
Cutback
For pipes smaller than DN 600 the length of the cutback shall be no greater than 150 mm. For larger pipes the cutback shall be (150±20mm).For theree-layer coatings,the epoxy resin and adhhesive layers at the pipe ends shall be removed to at least 80 mm from the welding bevel.A not less than 20mm strip of epoxy resin or epoxy resin and adhesive should extend form the cutback of the polyethylene coating.For coating thicknesses up to 2.2 mm the bevel angle shall be no greater than 45°,for greater coating thicknesses the bevel angle shall be no greater than 30°.Other end designs and/or angles may be agreed.
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