Heat Shrink Oil Barrier Tube for PILC Cable Joints and Terminations (GOBT)

About Heat Shrink Oil Barrier Tube for PILC Cable Joints and Terminations (GOBT)

Paper insulated lead covered (PILC) cable is still in service across many utility networks, and it needs extra care when it is jointed or terminated. Its paper insulation is impregnated with oil or compound, which migrates out of a cut core and can attack and track along the polymeric materials of a heat-shrink joint or termination.

Gala's oil barrier tube (code GOBT) stops that. Made from cross-linked polyolefin formulated to resist oil, it is shrunk over each prepared core, sealing the impregnant inside the paper while adding a layer of insulation. The heat-shrink components of the joint or termination then go on over it. Oil barrier tubes are part of Gala's PILC termination and joint kits, and are also supplied on their own.

Six sizes run from GOBT 30/10 to GOBT 115/34; the first figure is the minimum supplied inside diameter and the second the maximum recovered inside diameter, in mm. Recovered walls are 2.5 mm, and 3.0 mm on the largest size. The tube shrinks at 125 deg C and is rated for continuous use from -40 deg C to +110 deg C. Shrink with a soft propane flame, working from the centre outwards.

Manufactured by Gala in India. Datasheet and size selection on request.

Specifications

• Brand: Gala
• Product type: Heat shrink oil barrier tube for PILC cable cores
• Material: Oil-resistant cross-linked polyolefin
• Colour: Translucent (as photographed on GSF's sheet)
• Voltage rating: For PILC cable joints and terminations up to 33 kV (36 kV equipment)
• Operating temperature: -40 deg C to +110 deg C (continuous)
• Size range: 30 to 115 mm supplied ID; 10 to 34 mm recovered ID
• Wall type / thickness: 2.5 mm to 3.0 mm after recovery (+/-10%)
• Standards tested to: Test methods quoted on GSF's datasheet - ASTM D638, ASTM D2671, ASTM D792, ASTM D2240, ASTM D570, ASTM D149, ASTM D150, ESI 09-11, IEC 216 (no third-party report in our evidence)
• Application: Sealing the impregnant inside PILC cable cores at joints and terminations
• Installation: Propane torch, as part of the joint or termination build-up
• Country of origin: India
• Shrink temperature: 125 deg C
• Tensile strength: 12 N/mm2 min (ASTM D638)
• Elongation at break: 350% min (ASTM D638)
• Dielectric strength: 12 kV/mm min (ASTM D149)
• Low temperature flexibility: -40 deg C for 4 h, no cracking

Sizes

• GOBT 30/10 | Ds 30 | Df 10 | T 2.5
• GOBT 40/12 | Ds 40 | Df 12 | T 2.5
• GOBT 50/16 | Ds 50 | Df 16 | T 2.5
• GOBT 75/22 | Ds 75 | Df 22 | T 2.5
• GOBT 90/26 | Ds 90 | Df 26 | T 2.5
• GOBT 115/34 | Ds 115 | Df 34 | T 3.0

Applications: Power distribution utilities with PILC networks, cable jointing and termination contractors, heat-shrink kit assemblers, cable repair and network refurbishment teams