A flange isolation gasket kit protects pipeline flanges against damage caused by galvanic corrosion. The flange Gasket kits are intended to protect flanged joints and flanges against electrolytic corrosion produced by static currents in a pipe system.
A specific gasket, isolation sleeves for nuts and stud bolts, and special washers are included in the gasket isolation kits. These components are made of specific materials that have good chemical stability, dielectric, and less water absorption characteristics.
Flanger Gasket Kit Classification
The following are some examples of flange gasket kits:
Type “F” Flange Kit (Ring Face Gasket)
Type F isolation gaskets (ring type) are designed to fit raised face flanges (RF). F-type gaskets have an outside diameter smaller than the flange-facing surface.
You may enhance the cathodic isolation provided by the flange isolation kit by adding specific band protectors to the flanged joint.
Type F gaskets are manufactured using 1/8″ thick fabric-based phenolic sheets, both with and without coating, and have a nitrile rubber covering on both faces. Non-asbestos fibers with excellent isolation capability are also available for Type F gaskets.
Flange Gasket Kit Type “E” (Full Face)
Type “E” gaskets (full-face type) have an external diameter that is equivalent to the flange diameter, i.e., they cover the entire flange surface area.
The design also assists in keeping foreign material out of the flange joints and improves the kit’s isolation qualities. High-temperature, neoprene-faced phenolic, and phenolic materials are available in Type E flange insulation kits.
Flange Gasket Kit Type “D” (API Ring Joint Gasket)
Flange gaskets of type “D” fit ring joint face flanges as they fit the ring joint groove of RTJ flanges (styles R, RX, and BX). Type D gaskets are also available in a phenolic grade known as “API ring joint.”
Type “O” Flange Gasket Kit
On both sides of the device, Type O gaskets include an additional sealing element, which is commonly Viton Rubber, Nitrile, or PTFE, and are available in full and ring face designs. G-10 and phenolic materials are used to make Type O gaskets.
Insulation sleeves are often made of phenolic or polyethylene.
Installation of Gasket Kit
Installing a gasket kit is simple and easy if you know how to do it correctly. Here are a few things to think about before you start to install.
Cleaning Process of Gasket Kit
It is advantageous to clean all dirt and impurities from washers, fasteners, and gaskets. Examine all fasteners (nuts, studs, bolts) and washers for flaws such as cracks and burns. Always inspect the flange surfaces for flaws.
Check that the holes in the flanges and bolts are coaxial. The lowest flange gap is 10 mm. Insert the gasket with care and in a straight line. Jointing compounds, lubricants, and grease should not be used on the gasket or flange surface. Compounds can cause friction between the gasket and the flange, resulting in premature joint failure.
Assembling Flange Kits
Tighten the nut by applying bolt lubricant to the nut, bolt threads, and nut face. Turn the steel washer, insulation washer, and insulation sleeve onto the bolts (ensure the steel washer is always close to the nut). Insert the bolts into the holes. Avoid using the hammer since it will break the sleeves.
If the installation is hard, double-check the flange surface alignment and sleeve size. Insert the insulator washer, steel washer, and nut into the bolts on the other side of the flange. Fasten all of the bolts until the flange is completely attached to the gasket.
The following are the five stages you must follow:
- First of all, tighten all of the nuts manually, then use a smaller wrench for larger nuts.
- Tighten each nut to 30% of the required torque.
- Tighten each nut to 60% of the required torque.
- Tighten each nut to the maximum torque specified.
- Tighten all nuts clockwise to ensure that they all reach the specified torque.
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