Heat Shrink Cable Repair Kits For Damaged BS6883 Offshore Cables
Published 09 Oct 2019
uploaded by Chris Dodds | Thorne & Derrick Sales Marketing Manager
Working with Anixter, Thorne & Derrick are supplying heat shrink cable sheath repair kits to reinstate and repair cable damage to BS6883 offshore cables (600/1000 volts low voltage) – during installation of the offshore type cables (BS6883) the bending radius was exceeded causing stress cracks and splits on the EPR rubber insulation.
The lay-flat wrap-around design of heat shrink cable repair kits enable fast and reliable repairs to cable damage without resort to cable jointing or electrical circuit isolation.
The damaged cable can be repaired mid-circuit without resort to disconnection of the cable at the point of cable gland or cable termination. The damaged cables with an outside diameter of 19mm are to be repaired using 250no lengths of pre-cut sections of SPS SWRS 50-15 heat shrink repair kits.
The dielectric strength of a wraparound repair sleeve is minimum 11kV-12kV per mm of thickness and after recovery the heat shrink will provide a 2mm wall thickness.
This level of re-insulation is sufficient to seal and protect the cable and provide some additional insulation. However, whilst a heat shrink wrap sleeve is an excellent choice to repair low and high voltage cables, if any damage to the conductive screen or primary insulation on high voltage cable is evident, removing the damage and fitting a cable joint would be the recommendation.
Heat Shrink Cable Repair Kits
SPS SWRS Specification
|Item||Test Condition & Material||Requirement|
|Bursting Strength||Test Temp: 23±5°C||Min 3000N|
|Thermal Ageing Bursting Strength||168Hrs at 150±2°C (After Free Shrinkage)||Min 5000N|
|Dielectric strength||Electrode Surface Dia: 6mm. Weight: 50±2gms. Voltage Steps: 2kV/20sec||Min 12 kV/mm|
|Split Resistance||Temp: 200±2°C. Test time 23±3°C||No split Propagation|
|Carbon Content UV Res of Out/layer||Heating Rate: 20°C/min. Gas Flow Rate: 300cc/min||Min 2.5%|
|Cold Crack Resistance||Test temp: ≤-40°C||No crack|
|Resistance to Aggressive Media
|Test Media: Fuel Oil, Petroleum Jelly. Test Temp: 70 ± 2°C||Min 2000N|
|Environmental Stress cracking||10% Igepal Co 630. Solution Immersion Time: 30 days
Test Temp: 50 ± 3°C
|Temp. indicating paint conversion||Scraped Off Paint From Sleeve||230-250°C|
Pictured : BS6883 Offshore Cable – Typical Cable Construction – EPR Rubber Insulated Cables 600/1000 Volts
How to Install Wraparound Repair Sleeves
- Position the wraparound sleeve over the cable damage, joint or splice and close the metal channel
- Apply heat using the heat shrink gas torch to shrink the sleeve onto the cable sheath and melt the adhesive liner
- The finished sleeve is allowed to cool creating moisture proof and corrosion resistant cable seal
T&D are the largest UK distributor for SPS (Shrink Polymer Systems) and stock an extensive range of SPS 11kV and 33kV heat shrink cable joints and cable terminations.
LV Cable Joints (Low Voltage Cables)
Thorne & Derrick stock and distribute LV Joints in Cold Shrink, Heat Shrink or Resin Cast technologies – multicore and multi-pair cable joints are available for immediate backfill and energisation of Low Voltage power, control and instrumentation cables 600V/1000V 3.3kV.
Complete range of LV Cable Accessories ➡