Flange Bolt Isolation Kit

QS Flange: Wuxi Flange Bolt Isolation Kit

Complete flange bolt isolation kit: insulating gasket, sleeves and washers that stop current flow across the joint for cathodic protection and corrosion control.

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One-Minute Overview

Complete set: insulating gasket, bolt sleeves and washers for one flange joint.
Breaks electrical continuity so cathodic protection stays on the intended side.
Each bolt is isolated by a sleeve and two washers with a steel washer between.
Supplied to match common flange sizes and pressure classes.

A flange bolt isolation kit removes the electrical path across a bolted flange joint. Steel bolts and gasket washers normally bridge the two flanges; the insulating gasket, non-conductive sleeves and washers in this kit block that path so cathodic protection current stays on the protected section and galvanic corrosion at the joint is controlled.

Kit composition:
- Insulating gasket for the flange facing
- One sleeve per bolt
- Two insulating washers per bolt with a steel load washer between them

The sleeves line the bolt holes and the washers isolate the bolt head and nut from the flange, while the steel washer carries the clamping load. Select the kit by flange size, pressure class and bolt count of the joint, and install it together with the flange bolting in the usual star pattern.

FAQ

Q1. How does the kit break the electrical path across the joint?

Steel bolts and washers normally bridge the two flanges. This kit blocks that path three ways: the insulating gasket sits between the flange faces, a sleeve lines each bolt hole, and two insulating washers isolate the bolt head and nut while a steel washer in between carries the clamping load.

Q2. If the washers are insulating, what keeps the joint tight?

A steel load washer is sandwiched between the two insulating washers on every bolt. The insulating pair breaks the electrical path, and the steel washer carries the clamping load, so the joint tightens exactly as it should while the galvanic bridge through the bolt stays cut.

Q3. How do I select the right kit for my flange?

Select by flange size, pressure class and bolting: the kit is supplied to match common flange sizes and pressure classes, with one insulating gasket for the facing and the correct count of sleeves and washers for your bolt circle. Getting the bolting spec right matters, because every bolt needs its own sleeve and washer pair.

Q4. What's the minimum I can order?

Standard flange insulation gasket kits start at one set, and standard gaskets, studs, washers and sleeves start at one piece. Kits made to your drawing or for a non-standard bolt pattern are quoted individually, because the minimum really depends on the material and the tooling involved.

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