Heat Shrink Corrosion Protection Sleeve for Pipeline Weld Joints (GTWS)

About Heat Shrink Corrosion Protection Sleeve for Pipeline Weld Joints (GTWS)

A coated steel pipeline is left bare at every field weld. Unless that joint is coated to match the line coating, it is where corrosion starts. Gala's three-layer corrosion protection sleeve (code GTWS) is a wrap-around heat-shrink sleeve made to close that gap on buried or exposed steel pipelines, and on insulated pipelines.

The sleeve is a cross-linked polyethylene backing with a hot-melt adhesive layer. It is wrapped around the cleaned and pre-heated weld area, its overlap is closed with the supplied closure patch, and it is heat-shrunk with a torch. As it shrinks, the adhesive melts and bonds to the steel and to the polyethylene or FBE line coating on each side, forming a continuous anti-corrosion layer with the pipe's own coating. The finished joint resists soil stress, moisture, bacteria and mildew, the pipeline's cathodic protection current, and corrosion from liquids and solvents.

Each size is cut to the pipe's outside diameter: fifteen sizes run from GTWS dia 159 x 500 to GTWS dia 1016 x 500, all 500 mm wide, with sleeve lengths from 620 to 3430 mm and a 500 mm closure patch 100 to 200 mm long. On GSF's sheet the adhesive softens at 95 deg C, and the sleeve passes a -15 deg C flexibility test.

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

Specifications

• Brand: Gala
• Product type: Wrap-around heat-shrink corrosion protection sleeve for pipeline field joints, with closure patch
• Material: Cross-linked polyethylene backing with hot-melt adhesive
• Colour: Black (as photographed)
• Size range: Pipe OD 159 mm to 1016 mm
• Wall type / thickness: Not stated on GSF's sheet (ask)
• Adhesive / sealant: Hot-melt adhesive, softening point 95 deg C (ASTM E28)
• Standards tested to: Test methods quoted on GSF's datasheet - ASTM D638, ASTM G14, ASTM D2240, ASTM D570, ASTM D1044, ASTM D2671, ASTM E28 (no third-party report on a coded GTWS sleeve in our evidence)
• Application: Corrosion protection of girth weld joints on buried or exposed steel pipelines and insulated pipelines
• Installation: Clean and pre-heat the joint, wrap the sleeve, fit the closure patch, shrink with a propane torch
• Country of origin: India
• Sleeve width: 500 mm
• Peel strength (GSF sheet, 25 deg C / 50 deg C): PE to steel 100 / 30 N/cm; PE to FBE 120 / 35 N/cm; PE to PE 110 / 30 N/cm (ASTM D2671)
• Low temperature flexibility: -15 deg C for 4 h, no cracking

Sizes

• GTWS dia 159 x 500 | sleeve 620 x 500 | patch 100 x 500
• GTWS dia 219 x 500 | 830 x 500 | 100 x 500
• GTWS dia 273 x 500 | 1000 x 500 | 100 x 500
• GTWS dia 325 x 500 | 1200 x 500 | 120 x 500
• GTWS dia 377 x 500 | 1370 x 500 | 120 x 500
• GTWS dia 406 x 500 | 1500 x 500 | 150 x 500
• GTWS dia 426 x 500 | 1560 x 500 | 150 x 500
• GTWS dia 457 x 500 | 1660 x 500 | 150 x 500
• GTWS dia 508 x 500 | 1840 x 500 | 170 x 500
• GTWS dia 529 x 500 | 1900 x 500 | 170 x 500
• GTWS dia 610 x 500 | 2160 x 500 | 170 x 500
• GTWS dia 711 x 500 | 2480 x 500 | 170 x 500
• GTWS dia 720 x 500 | 2500 x 500 | 170 x 500
• GTWS dia 813 x 500 | 2800 x 500 | 170 x 500
• GTWS dia 1016 x 500 | 3430 x 500 | 200 x 500

Applications: Oil and gas pipelines, city gas distribution, water transmission pipelines, pipeline EPC and coating contractors, district heating and insulated pipelines, refinery and plant piping