Radiation crosslinked heat-shrink bell-ended joint

Radiation crosslinked heat-shrink bell-ended joint

Heat shrink joints are designed for the reconstruction of the jacket pipe in the joint areas of the preinsulated Pipes. 

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Heat shrink joints are designed for the reconstruction of the jacket pipe in the joint areas of the preinsulated Pipes. The joints made of radiation crosslinked polyethylene guarantee their high shrink strength and the shape memory. These features are basic for performing reliable, flexible and tight joint which is resistant to temperatures from -55°C to +125°C.

Radiation crosslinked heat shrink joints perfectly reconstruct the jacket of the preinsulated pipe which results in reducing the soil frictional resistance and thus the life length of the joint. They are also highly resistant to stress corrosion. Due to high shrinking strength, ageing resistance and mechanical strength against the soil stress as a result of the thermal elongation in the pipeline, the joints assure reliability and safety of the performed joint.

Random spatial network of hydrocarbon bonds appears in the entire structure of HDPE material exposed to radiation crosslinking process. The crosslinking process restricts the quantity of unbounded molecules in the volume of the material which excludes the fusion of two elements of crosslinked polyethylene. The foaming holes are the only areas in the heat shrink joint protected against the crosslinking during the production. The remaining part of the heat shrink joint is crosslinked. The non-crosslinked area keeps the initial features of HDPE which allows for welding the plugs.

This solution is registered and protected by patent No. PAT. 205918  

Specification and properties of joints

  • ground load test certificate (“sand box” test or box test) for 1500 cycles in accordance with PN-EN 489: 2009, joint sealing with hot melt glue and butyl rubber compound,
  • equipped with 2 vent plugs and 2 fusion plugs, cleaning wipes,
  • factory-made filler holeswhich are adapted to the vent plugs,
  • heat shrink joint is made of radiation cross-linked, black high density polyethylene,
  • high mechanical strength of crosslinked material ensures resistance to tearing and abrasion,
  • use of a suitable seal in the joint protects the joint area in difficult conditions,
  • small number of construction elements of the joint reduces the assembly to a minimum time, and thus increases the assembly efficiency,
  • heat shrink tapes are not required which reduce the cost of assembly,
  • joints are resistant to corrosive chemical factors and UV radiation,
  • a homogenous layer of sealant as a hot melt adhesive and / or butyl mass is not susceptible to sticking of foreign bodies and does not tear when the joint is moving on the casing pipe,
  • each joint is individually packed in a white foil sleeve.

Selection of bell-ended joint for preinsulated pipes
– Bell-ended joints in the version for pre-insulated pipes with terminals
– 150 mm insulated steel pipe

Dimension of preinsulated pipe Type of bell-ended joint Dimension of joint [mm]
Casing pipe Carrier pipe DN Joint with adhesive and with mastic Joint with adhesive Joint with mastic Maximum inner diameter after entire recovery Inner diameter of waist part
D
Diameter
d
Catalog length
Length when deliver Gauge of foaming holes
l
Middle part
L1
Bends
L2
Diameter of holes
a
90 20, 25 M 90 DPW-L M 90 DKW-L M 90 DMW-L 70 105 95 650 670±20 240 350 150±10 20
110 32, 40 M 110 DPW-L M 110 DKW-L M 110 DMW-L 90 128 118 650 670±20 240 350 150±10 20
125 50 M 125 DPW-L M 125 DKW-L M 125 DMW-L 110 142 132 650 670±20 240 350 150±10 20
140 65 M 140 DPW-L M 140 DKW-L M 140 DMW-L 125 156 146 650 670±20 240 350 150±10 20
160 80 M 160 DPW-L M 160 DKW-L M 160 DMW-L 140 180 168 650 670±20 240 350 150±10 20
180 80 M 180 DPW-L M 180 DKW-L M 180 DMW-L 140 200 190 650 670±20 240 350 150±10 20
200 100 M 200 DPW-L M 200 DKW-L M 200 DMW-L 160 220 208 650 670±20 240 350 150±10 20
225 125 M 225 DPW-L M 225 DKW-L M 225 DMW-L 200 250 236 650 670±20 240 350 150±10 20
250 150 M 250 DPW-L M 250 DKW-L M 250 DMW-L 225 278 262 650 670±20 240 350 150±10 20
280 150 M 280 DPW-L M 280 DKW-L M 280 DMW-L 225 300 290 650 670±20 240 350 150±10 20
315 150 M 315 DPW-L M 315 DKW-L M 315 DMW-L 250 334 324 650 670±20 240 350 150±10 20
355 200 M 355 DPW-L M 355 DKW-L M 355 DMW-L 250 375 365 650 670±20 240 350 150±10 20
400 200 M 400 DPW-L M 400 DKW-L M 400 DMW-L 338 430 415 650 670±20 240 350 150±10 20
450 250 M 450 DPW-L M 450 DKW-L M 450 DMW-L 338 480 470 650 670±20 240 350 150±10 20
500 300 M 500 DPW-L M 500 DKW-L M 500 DMW-L 400 540 530 750 770±20 240 350 200±10 20
560 450 M 560 DPW-L M 560 DKW-L M 560 DMW-L 400 590 580 750 770±20 240 350 200±10 20
630* 500 M 630 DPW-L M 630 DKW-L M 630 DMW-L 400 670 660 670 660±20 240 350 200±10 20

* product available on individual agreement

– Bell-ended joints in the version for pre-insulated pipes with terminals – 220 mm insulated steel pipe

Dimension of preinsulated pipe Type of bell-ended joint Dimension of joint [mm]
Casing pipe Carrier pipe DN Joint with adhesive and with mastic Joint with adhesive Joint with mastic Maximum inner diameter after entire recovery Inner diameter of waist part
D
Diameter
d
Catalog length
Length when deliver Gauge of foaming holes
l
Middle part
L1
Bends
L2
Diameter of holes
a
90 20, 25 M 90 DPW M 90 DKW M 90 DMW 70 105 95 700 720±20 350 500 110±10 20
110 32, 40 M 110 DPW M 110 DKW M 110 DMW 90 128 118 700 720±20 350 500 110±10 20
125 50 M 125 DPW M 125 DKW M 125 DMW 110 142 132 700 720±20 350 500 110±10 20
140 65 M 140 DPW M 140 DKW M 140 DMW 125 156 146 700 720±20 350 500 110±10 20
160 80 M 160 DPW M 160 DKW M 160 DMW 140 180 168 700 720±20 350 500 110±10 20
180 80 M 180 DPW M 180 DKW M 180 DMW 140 200 190 700 720±20 350 500 110±10 20
200 100 M 200 DPW M 200 DKW M 200 DMW 160 220 208 700 720±20 350 500 110±10 20
225 125 M 225 DPW M 225 DKW M 225 DMW 200 250 236 700 720±20 350 500 110±10 20
250 150 M 250 DPW M 250 DKW M 250 DMW 225 278 262 700 720±20 350 500 110±10 20
280 150 M 280 DPW M 280 DKW M 280 DMW 225 300 290 700 720±20 350 500 110±10 20
315 150 M 315 DPW M 315 DKW M 315 DMW 250 334 324 750 770±20 350 500 135±10 20
355 200 M 355 DPW M 355 DKW M 355 DMW 250 375 365 750 770±20 350 500 135±10 20
400 200 M 400 DPW M 400 DKW M 400 DMW 338 430 415 750 770±20 350 500 135±10 20
450 250 M 450 DPW M 450 DKW M 450 DMW 338 480 470 750 770±20 350 500 135±10 20
500 300 M 500 DPW M 500 DKW M 500 DMW 400 540 530 850 870±20 350 500 180±10 20
560 450 M 560 DPW M 560 DKW M 560 DMW 400 590 580 850 870±20 350 500 180±10 20
630 500 M 630 DPW M 630 DKW M 630 DMW 400 670 660 900 920±20 350 500 200±10 20

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