Reduction joints are meant for the recovery of preinsulated pipes’ jackets of two different diameters. During the design of preinsulated pipeline network, the designers usually use preinsulated steel reducers for the connection of two pipelines of different diameters. Then, there is a need for using two standard joints to connect the preinsulated reducer and the preinsulated pipes. This solution raises the costs of the investment. The heat shrink reduction joint is a user-friendly alternative as for it eliminates application of the preinsulated reducer and two standard joints. The other advantage, beside lowering the costs, is shortening the time of construction works. The radiation crosslinked heat shrink reduction joint guarantees performing reliable and tight connection of two preinsulated pipes covering even two-dimension difference due to its shape memory and high shrink strength. The shape and dimension of the reduction joint is closely matched to the preinsulated pipes’ diameters which are going to be jointed.
RADPOL reduction joints’ advantage is high resistance to stress corrosion and the molded step-down lowers the soil frictional resistance during the thermal movements of the pipeline.

Instalation consists in shrinking down two ends of it and foaming it with the liquid PUR foam and then protecting the foaming holes with the welding plugs. The plugs are welded into non-crosslinked area which results in the fusion of the plug’s and the joint’s materials. This kind of welding is prone to any moisture leaks and guarantees tightness and long life of the joint.

Specification

• has a ground load test certificate (so-called sand box) for 100 cycles in accordance with PN-EN 489: 2009, test carried out by the Research Laboratory of the Research and Development Center for Heat Engineering of the Capital Group Przedsiębiorstwo Energetyki Cieplnej S.A. in Warsaw
• the reduction joint is made of black high-density polyethylene, radiation cross-linked,
• high mechanical strength of cross-linked material ensures resistance to tearing and abrasion,
• the use of appropriate sealing in the joint protects the joint area in difficult conditions
• a small number of elements forming the muff reduces assembly time up to min., and thus increases the efficiency of muff assembly and reduces the cost of the connector,
• the joints are resistant to corrosive chemical agents and UV radiation,
• each joint is individually packed in a white foil sleeve.
   

Selection of radiation-crosslinked heat shrinkable reduction shrink sleeves with butyl rubber for pre-insulated pipe sizes – with 150 mm ends of an insulated steel pipe.

Selection of radiation-crosslinked heat shrinkable reduction shrink sleeves with butyl rubber for pre-insulated pipe sizes – with 220 mm ends of an insulated steel pipe.

Attention: the joint in all sizes is fitted to typical, welded, seamless steel reduction available on the market.
Reduction joints are normally produced with butyl rubber (MR..MW). Special reducing couplings are available on request in other sealing variants

Content of the joint set

• Heat shrink joint radiation crosslinked with factory made holes
• 2 venting plugs
• 2 welding plugs
• 2 cleaning tissues
• Mounting instruction