Isolation & Insulation
Flange Isolation Kits
Electrical Isolation for Cathodic Protection
Flange isolation kits break the electrical path across flanged pipe joints, preventing galvanic corrosion and keeping cathodic protection systems intact. Each kit comes as a complete set: isolating gasket, insulating bolt sleeves, insulating washers, and steel washers, matched to your flange size and pressure class. One thing we always recommend: test with an isolation checker after installation, because a single missed sleeve defeats the whole kit.
Types & Variants
Type E (G10 Gasket)
G10 fibreglass laminate gasket with Mylar sleeves and washers. Standard for general pipeline isolation to ASME B16.5.
Type F (PTFE-Faced)
PTFE-faced phenolic gasket with PTFE sleeves. For higher chemical resistance in process piping.
Type D (Neoprene-Faced)
Neoprene-faced gasket for water and low-pressure applications where budget is a priority.
Common Applications
Pipeline Cathodic Protection
Isolating flanges at pipeline stations, pig launchers, and metering skids to maintain cathodic protection integrity.
Process Plant Isolation
Preventing galvanic corrosion between dissimilar metals at flange connections in chemical plants.
Tank Farm Piping
Isolating above-ground storage tank connections from pipeline cathodic protection zones.
Materials & Standards
Materials
- G10/G11 fibreglass laminate
- Phenolic laminate (PTFE-faced)
- Neoprene-faced phenolic
- Mylar (PET) sleeves and washers
- PTFE sleeves and washers
- Zinc-plated steel washers
Standards
- AS 2832 — Cathodic protection of metals
- NACE SP0286 — Electrical isolation of cathodically protected pipelines
- ASME B16.5 — Pipe flanges dimensions
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Compressed fibre, rubber sheet, PTFE, flexible graphite, engineering plastics, foams, and metal shim, supplied as raw stock for in-house cutting, fabrication, or repair.
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Stud bolts, hex bolts, washers, and nuts in carbon steel, stainless steel, and exotic alloys to ASTM and ISO standards.
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Precision Shim Stock & Packs
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Flange size, pressure class, and which type (E, F, or D): we'll have a complete kit ready to ship. Not sure which type? We can advise based on your media and temperature.
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This page is provided for general engineering reference only and does not constitute professional advice, specification, or guarantee of performance. Actual results depend on specific application conditions. Universal Gaskets Pty Ltd accepts no responsibility or liability for decisions made based on this information. For full terms, see our Terms & Conditions.