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Metal Jacket Gasket

DESCRIPTION

Metal-jacketed gaskets are particularly suitable for sealing flat surfaces of heat exchangers, gas pipes, cast iron flanges, autoclaves and similar. The heat exchanger gaskets come in a wide range of types including single or double jacketed, corrugated, plain metal, soft and many others.

SHAPE AND CONSTRUCTION

These gaskets are used in shell and tube type heat exchangers. They can be manufactured in very different sizes, shapes, with or without bars. The primary seal is at inner diameter of the gasket, the outer gasket diameter acts as a secondary seal. The bars seal between the heat exchangers passages. The heat exchanger gaskets are produced in several types to meet the most demanding applications. Gaskets for heat exchangers can be manufactured in metal or alloy with a thickness of 0.4mm featuring a soft core inside a metallic jacket.

MATERIALS FOR HEAT EXCHANGER GASKETS

Selection of the jacket material depends on operating conditions. Materials for metallic jacket are as below:

Metallic jacket

MATERIAL ASTM DIN MATERIAL NO
Low Carbon Steel Soft Iron (CS) 1.0333
Stainless Steel AISI 304 1.4301
Stainless Steel AISI 316, 316L 1.4401, 1.4404
Stainless Steel AISI 321 1.4541
Stainless Steel AISI 316 Ti 1.4571
Monel (NiCu30Fe) Alloy 400 2.4360
Copper Copper 2.0090
Brass Brass Ms 63 2.0321
Titanium B 348 Gr. 1 3.7025

Metallic jacket is normally 0.4mm thick
Other materials are available on request

Filler

The standard filler material is flexible graphite. Other fillers like ceramic, mineral or other can also be used.

Sizes

The metal jacketed gaskets come in sizes according to EN 1514-4 and ASME B 16.20. Below table shows standard dimensions for these gaskets:

STANDARD DIMENSIONS
Gasket Thickness 2-12mm
Gasket Width 10,13 and 16mm
Bar Width 8,10 and 13mm

Tolerances

The tolerances of metal jacketed gaskets meet ASME B 16.20 and EN 1514-4. Manufacturing tolerances are as follows:

MANUFACTURING TOLERANCES
Gasket Inside Diameter (mm) Diameter Tolerance (mm)
Inside Diameter Outside Diameter
Up to 150 +0.8; -0.0 +0.0; -0.8
From 150 to 1500 +1.6; -0.0 +0.0; -1.6
1500 or greater +2.4; -0.0 +0.0; -2.4

METAL JACKETED GASKETS WITH INTEGRATED BARS

Double jacketed gaskets for heat exchangers are manufactured with integrated bars. There is a radius between bars and an internal diameter of the gasket. The values of the radius for the most commonly used metals and alloys are shown in the following table. If a radius is less than R min, the material can crack, reducing the sealing properties of the gaskets. Gasket materials can be seen in below table:

GASKET MATERIALS AND R min
Gasket Material R min
Copper 8mm
Soft Iron (CS) 8mm
Brass, Monel 10mm
Stainless Steel 10mm
Ring Joint Gasket
Spiral Wound Gasket
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