Polyethylene sleeving (application)
Polyethylene sleeving is made up of overlapping elements:
– a “barrel sleeve” along the barrel of every pipe,
– a “joint sleeve” at every joint.
Pipes and fittings must be as clean and dry as possible before sleeving. In particular avoid soil entrapment between the pipe and sleeving.
The pipe bed and natural soil, or backfill, must only consist of fine material, to avoid sleeving damage occurring during laying or in service (top loads, weight of full main, wheel loads).
The sleeving must fit the pipes as snugly as possible (importance of the fold and ties). See sketches opposite.
The barrel and joint sleeve overlaps must provide total continuity of protection.
The fold must always be made at the top of the pipes, to limit the risk of damage during backfilling. Do not use ripped sleeving and avoid damage during backfilling.
Small tears can be repaired with adhesive tape. Larger defects can be covered with extra sleeving of the same type, which must be sufficiently long to cover the damaged area.
The same application technique must be used as for the joint sleeves.
The polyethylene sleeve must be stored under cover, protected from heat and sunlight.
Cut the barrel and joint sleeves to the dimensions indicated in the section “Material required and dimensions”.
Note : For STANDARD DN 60 to 600 pipes, the barrel and joint sleeves are supplied pre-cut to size in one package.