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Dielectric Flange Kit Flange Isolating Gasket Kits Types of Flange Gaskets

author: Qishine Industry
2023-05-16
Dielectric flange kits—also called flange isolating gasket kits—keep two flanges electrically separated while sealing the joint. They protect piping from stray current, galvanic corrosion, and shock. This article explains what a dielectric kit is, the common types of flange gaskets, and how to choose the right insulating kit.

One-Minute Overview

  • A dielectric flange kit insulates two flanges and seals the joint.
  • It blocks stray current and galvanic corrosion between flanges.
  • Common flange gaskets include flat, spiral-wound, and ring-joint types.
  • Choose by the temperature, chemical, and pressure of the service.

What Is a Dielectric Flange Kit and How It Protects Against Electrical Hazards

A dielectric flange kit is a flange gasket kit built to give electrical insulation between two flanges. The kit usually pairs a dielectric gasket with a sleeve, washer, or isolator made of non-conductive material such as PTFE or phenolic. It stops current passing through the joint, cutting the risk of shock, fire, or corrosion damage to the equipment and wiring.

Types of Flange Gaskets and Their Benefits

Flange gaskets seal between two surfaces in many systems. Knowing the types helps you pick the right one.

Flat Gaskets

Flat gaskets are made from rubber, metal, or plastic. They sit between flat faces and are easy to install with a reliable seal—common in plumbing.

Spiral-Wound Gaskets

Spiral-wound gaskets are a metal strip wound with a soft filler such as graphite or PTFE. They seal where faces are not perfectly flat and suit high-pressure duty.

Ring-Joint Gaskets

Ring-joint gaskets are all-metal gaskets for high-pressure joints, seated in a flange groove for a robust seal.

Dielectric Flange Kits

Dielectric flange kits are built to insulate flanges electrically while sealing. They pair a non-conductive gasket with isolating hardware to block current and prevent corrosion.

How to Choose the Right Insulating Gasket Kit

Pick an insulating kit by the service environment. First the temperature range—silicone or PTFE for high heat, neoprene or EPDM for low. Then the chemical environment—nitrile or Viton for oil and fuel, EPDM or silicone for water and steam. Finally the pressure range—PTFE or graphite for high pressure, neoprene or EPDM for low. Matching material to duty avoids early failure.

FAQ

What is a dielectric flange kit?

A flange gasket kit that insulates two flanges electrically. It pairs a non-conductive gasket (PTFE or phenolic) with isolating hardware, blocking current that would otherwise cause corrosion or damage.

What types of flange gaskets are available?

Flat gaskets (rubber, metal, or plastic for easy seals), spiral-wound (metal strip plus filler for high pressure), ring-joint (all-metal for high-pressure grooves), and dielectric kits (insulating while sealing).

What are the benefits of using a dielectric flange kit?

It gives electrical insulation between flanges, stopping current that causes corrosion or damage. Kits are easy to install, need little maintenance, and give a reliable seal that prevents leaks and contamination.

How do I choose the right insulating gasket material?

Match the material to the service: temperature (silicone/PTFE for high, neoprene/EPDM for low), chemical exposure (nitrile/Viton for oil, EPDM/silicone for water), and pressure (PTFE/graphite for high, neoprene/EPDM for low).

Expanded PTFE Gasket Tape and Joint Sealant Tape PTFE Sealing Tape

Dielectric Flange Kits Insulation Isolation Kits for Flanges Phenolic and Pikotek Gaskets

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