METAL JACKETED GASKETS
The Metal Clad Gasket is the most basic and cost effective type of semi-metallic gasket.
Applications Include
- Heat Exchangers
- Pressure Vessels
- Valve Bonnet Gaskets
- Pumps
- Boilers and Flues
- Exhaust gases
General Properties
- Economical and cost effective
- Easy to handle and install
- Suitable for narrow flanges
- Suitable for high temperature
- Suitable for high pressure
- Cover a range of chemical media
- Good blow-out resistance
- Available in many styles, shapes and sizes
There are two different styles of manufacture of Metal Jacketed Gaskets, these being of a One-Piece, or alternatively, a Welded construction.
One-Piece Construction
These are manufactured using a single sheet of material.
This can therefore restrict the size of gasket available as it is dependent on the sheet size of material available, generally between 1400 mm and 1800 mm in diameter. The pass partition bars are also in this one piece construction intersecting with the outside ring. Should leakage occur, the flow path will follow along the length of the pass bar to the outer diameter of the ring where sealing will become reliant and be maintained by the secondary seal.
Welded Construction
This type of construction does not have any limitations on gasket size. It is also generally more cost effective as the process is quicker and material yield higher. The pass partition bars are securely welded into place with soft and small spot welds in two places at each end of the bar. Any leak path is retained by the primary seal at the inner diameter of the gasket therefore providing a technically superior gasket seal.
Styles available
There are 5 main styles of Metal Jacketed Heat Exchanger Gaskets, available in a wide range of metal jackets and filler material configurations
Style MCG1
Double Jacketed Gasket : Used on high temperature and pressure applications or where corrosion problems may exist. The filler material is totally enclosed in a two-piece metal encapsulation having good compressibility and resilience and is the most common and popular style of Metal Clad Gasket
Style MCG2
Single Jacketed Gasket – Partly Enclosed : This is the least used and most uncommon Style. Used where flanges are pitted or of poor surface finish, or where the radial dimensions only allow for a narrow width seal
Style MCG3
Single Jacketed Gasket – Totally Enclosed : Similar to style MCG2 but totally enclosed in a metal shroud giving more filler protection. This may be used on narrow flange widths where Style MCG1 is unsuitable
Style MCG4
Single Corrugated (No Filler) : This is a plain, all metal corrugated gasket It is used mainly in low pressure valve applications with a small recess gap or weight limitations and where the available bolt loads are low.
Style MCG5
Double Jacketed Corrugated Gasket Manufacturing process as with Style MCG1 only it is then corrugated. These corrugations give improved resilience in applications where thermo-cycling may be a problem. These also give a reduced contact area which enhances its compressive characteristics making it suitable for uneven flanges.
Materials Available
| Metal Jacket Materials | Soft Filler Materials |
|---|---|
| Soft Iron | Non-Asbestos Millboard |
| 304 Stainless Steel | Graphite |
| 316/L Stainless Steel | Rubber |
| 316 Ti Stainless Steel | PTFE Sintered |
| 321 Stainless Steel | PTFE Unsintered |
| 347 Stainless Steel | Ceramic Fibre |
| Duplex | Non-Asbestos |
| Nickel 200 | Firefly |
| Monel 400 | |
| Titanium | |
| Hastelloy B2, C276 | |
| Inconel 600, 625, 800, 825 | |
| Aluminium | |
| Copper | |
| Brass |
