Radiation crosslinked heat-shrink straigh joints

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 straight joint for preinsulated pipes
– Straight 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	Catalog length L kat.	Length when deliver	Gauge of foaming holes l	Diameter of holes a
90	20, 25	M 90 PW	M 90 KW	M 90 MW	77	105⁺⁵	650	670^±20	240	20
110	32, 40	M 110 PW	M 110 KW	M 110 MW	90	128⁺⁵	650	670^±20	240	20
125	50	M 125 PW	M 125 KW	M 12 MW	110	142⁺⁵	650	670^±20	240	20
140	65	M 140 PW	M 140 KW	M 140 MW	125	156⁺⁵	650	670^±20	240	20
160	80	M 160 PW	M 160 KW	M 160 MW	140	180⁺¹⁰	650	670^±20	240	20
180	80	M 180 PW	M 180 KW	M 180 MW	140	200⁺¹⁰	650	670^±20	240	20
200	100	M 200 PW	M 200 KW	M 200 MW	160	220⁺¹⁰	650	670^±20	240	20
225	125	M 225 PW	M 225 KW	M 225 MW	200	250⁺¹⁰	650	670^±20	240	20
250	150	M 250 PW	M 250 KW	M 250 MW	225	278⁺¹⁰	650	670^±20	240	20
280	150	M 280 PW	M 280 KW	M 280 MW	225	300⁺¹⁰	650	670^±20	240	20
315	150	M 315 PW	M 315 KW	M 315 MW	250	340⁺¹⁵	650	670^±20	240	20
355	200	M 355 PW	M 355 KW	M 355 MW	250	390⁺¹⁵	650	670^±20	240	20
400	200	M 400 PW	M 400 KW	M 400 MW	338	430⁺¹⁵	650	670^±20	240	20
450	250	M 450 PW	M 450 KW	M 450 MW	338	480⁺¹⁵	650	670^±20	240	20
500	300	M 500 PW	M 500 KW	M 500 MW	400	540⁺²⁰	750	770^±20	240	20
560	450	M 560 PW	M 560 KW	M 560 MW	400	590⁺²⁰	750	770^±20	240	20

– Straight 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	Catalog length L	Length when deliver	Gauge of foaming holes l	Diameter of holes a
90	20, 25	M 90 PW-L	M 90 KW-L	M 90 MW-L	77	105⁺⁵	700	720^±20	350	20
110	32, 40	M 110 PW-L	M 110 KW-L	M 110 MW-L	90	128⁺⁵	700	720^±20	350	20
125	50	M 125 PW-L	M 125 KW-L	M 12 MW-L	110	142⁺⁵	700	720^±20	350	20
140	65	M 140 PW-L	M 140 KW-L	M 140 MW-L	125	156⁺⁵	700	720^±20	350	20
160	80	M 160 PW-L	M 160 KW-L	M 160 MW-L	140	180⁺¹⁰	700	720^±20	350	20
180	80	M 180 PW-L	M 180 KW-L	M 180 MW-L	140	200⁺¹⁰	700	720^±20	350	20
200	100	M 200 PW-L	M 200 KW-L	M 200 MW-L	160	220⁺¹⁰	700	720^±20	350	20
225	125	M 225 PW-L	M 225 KW-L	M 225 MW-L	200	250⁺¹⁰	700	720^±20	350	20
250	150	M 250 PW-L	M 250 KW-L	M 250 MW-L	225	278⁺¹⁰	700	720^±20	350	20
280	150	M 280 PW-L	M 280 KW-L	M 280 MW-L	225	300⁺¹⁰	700	720^±20	350	20
315	150	M 315 PW-L	M 315 KW-L	M 315 MW-L	250	340⁺¹⁵	750	770^±20	350	20
355	200	M 355 PW-L	M 355 KW-L	M 355 MW-L	250	390⁺¹⁵	750	770^±20	350	20
400	200	M 400 PW-L	M 400 KW-L	M 400 MW-L	338	430⁺¹⁵	750	770^±20	350	20
450	250	M 450 PW-L	M 450 KW-L	M 450 MW-L	338	480⁺¹⁵	750	770^±20	350	20
500	300	M 500 PW-L	M 500 KW-L	M 500 MW-L	400	540⁺²⁰	850	870^±20	350	20
560	450	M 560 PW-L	M 560 KW-L	M 560 MW-L	400	590⁺²⁰	850	870^±20	350	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

Radiation crosslinked heat-shrink straigh joints

Heat shrink sleeve, straight for preinsulated pipeline system

Radiation crosslinked heat shrink bend joint

Radiation crosslinked heat shrink joints – characteristic

HDPE collars