Metal-jacketed gaskets

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Metal-jacketed gaskets

CONSTRUCTION

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 METALLIC JACKET

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

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

– Metallic jacket is normally 0.4mm thick

– Other alloys 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
2 -12 mm	Gasket thickness
10 , 13 and 16 mm	Gasket width
8 , 10 and 13 mm	Bar width

TOLERANCES

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

MANUFACTURIN TOLERANCES
Diameter tolerance (mm)		Gasket Inside Diameter (mm)
Outside diameter	Inside diameter	Gasket Inside Diameter (mm)
+0.0 ; -0.8	+0.8 ; -0.0	Up to 150
+0.0 ; -1.6	+1.6 ; -0.0	from 150 to 1500
+0.0 ; -2.4	+2.4 ; -0.0	1500 or greater

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
R min	Gasket material
8 mm	Copper
8 mm	Soft iron (CS)
10 mm	Brass, Monel
10 mm	Stainless steel

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