Heat Shrinkable Joint
It is a kind of connecting pipe fitting what is widely used on anti-corrosion, especially on Directly buried pre-insulated pipes field joint. It is made by Polyethylene sheets complex with the electro-fusion wire.
( Our Company Heat shrinkable sleeve and heat shrinkable sleeve equipment can be provided)
1. According to the pipe corrugated process, the peak valley width usually from 60mm to 80mm, the Narrow tape welding the pipe joint along the cutting edges.
2. Because of various of restrictions, can not guarantee the airproof capability after the pipe joint welded.
3. The best way to weld the joint should use the Hand extruder welding the cutting edges inside of the pipe first, the use the narrow tape welding it from outside.
2. Able to withstand axial forces initiated by axial movements of the pipe in the ground;
3. Able to withstand radial forces and bending moments;
4. Able to withstand effects of temperature and temperature variations.
5. Have the same thickness of the line pipe insulation layer
|NO||Text Item||Unit||Performance||Text Result||Text Method|
|1||Tensile Strength||MPa||≥17||19.47||ASTM D638|
|3||Vicat Softening Point||ºC||≥90||92||ASTM D1525|
|4||Brittleness Temperature||ºC||<-65||<-65||ASTM D2671C|
|5||Dielectric Strength||MV/m||≥25||33.13||ASTM D149|
|6||Volume Resistivity||Ω.m||≥1*1013||1.1*1013||ASTM D257|
|7||Environment Stress Crack||h||≥1000||>1000||GB/T1842|
|Chemical resistance (7d)||10% HCI||Tensile strength||MPa||≥85||104.9||ASTM D638|
|10% NaAH||Tensile strength||MPa||≥85||102.1||ASTM D638|
|10% NaCL||Tensile strength||MPa||≥85||108.3||ASTM D638|
|9||Thermal aging (150ºC,168h)||Tensile strength||MPa||≥14||20.7||ASTM D638|
|Text Item||Unit||Performance||Text Result||Text Method|
|Softening Point||ºC||≥90||90.1||ASTM E28|
|Brittleness Temperature||ºC||<-15||<-15||ASTM D2671C|
|Lap Shear||MPa||≥1.0||1.5||ASTM D1002|
|Steel N/cm||≥70||145.6||ASTM D1000|
|Primer N/cm||≥70||205.9||ASTM D1000|
|PE Layer N/cm||≥70||190.0||ASTM D1000|
NON-Solvent Epoxy Primer
|Text Item||Unit||Performance||Text Result||Text Menthod|
|Shear of cured perimer||MPa||≥5.0||12||SY/T0041|