Flange Isolation Kit

QS Flange: Jiangsu Flange Isolation Kit

Complete flange isolation kit - gasket, sleeves and washers - that breaks electrical continuity across one bolted joint.

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One-Minute Overview

A complete kit that breaks electrical continuity across one bolted flange joint.
Gasket, sleeves, washers and studs arrive together, sized for the same joint.
Stops galvanic corrosion where dissimilar pipe metals meet on a line.
Used on buried, wellhead and process piping that carries cathodic protection.

A flange isolation kit turns an ordinary bolted joint into an electrically insulating one. The gasket sits between the flange faces, every stud carries a sleeve so it cannot touch the wall of its bolt hole, and each nut bears on an insulating washer. Together the parts break the metal path that would otherwise let current travel from one side of the joint to the other. That matters wherever two different metals meet, because the joint becomes the point where galvanic corrosion eats into the less noble side of the pair.

The kit only works when every part goes in the right order: gasket centred first, sleeves through the bolt holes, washers under both nut and head, then tightening in a star pattern so the gasket compresses evenly and the sleeves are not pinched. Kits are selected for the flange size, pressure class, facing and service fluid, together with the coating used on the line. Typical applications are buried pipelines under cathodic protection, wellheads and flow lines, terminal and refinery piping, and any joint that must be checked for electrical continuity. Gasket material, sleeve length and washer type are confirmed against your flange drawing per inquiry, and a detailed specification sheet is available on request.

FAQ

Q1. How does the kit stop current from crossing the joint?

Three barriers do the work. The gasket isolates the two flange faces, the sleeve keeps each stud clear of its bolt hole wall, and the washer separates the nut from the flange. With all three in place, resistance across the joint stays high enough to keep cathodic protection current on the pipe it is meant to protect.

Q2. Can I reuse the steel studs that are already on the flange?

No. Bare studs and plain washers short the joint the moment they touch the flange, which defeats the whole kit. Insulating sleeves and washers are sized to the same bolt as the stud, so order them as a set and keep the spare parts bagged with the flange they belong to.

Q3. What happens if one washer goes missing on site?

The joint quietly becomes a conductor, and nobody finds out until the cathodic protection survey shows a short. Treat the washers as single-use items, count them before installation, and keep a few spares in the toolbox rather than borrowing a plain washer from the fittings bin.

Q4. What is the smallest order I can place?

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

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