Heat Exchanger Gaskets

	• Double-Jacketed Gaskets • Exchanger Gasket Style Chart • Double-Jacketed Gasket Design • Metal Jacketed and Metal Corrugated Gaskets • Heat Exchanger Gasket Typical Shapes

Double-Jacketed Gaskets Design

Double-jacketed gaskets shall be made with a filler completely enclosed in a corrugated metal jacket. For gaskets NPS 8 and larger, the corrugation pitch shall be 0.13-inch (3.2 millimeters) minumum and 0.25-inch (6.4 millimeters) maximum. For gaskets NPS 6 and smaller, the pitch shall not exceed 0.16-inch (4.0 millimeters).

The jacket metal thickness shall be 0.015-inch (0.4 millimeters) minimum.

The filler shall be 0.06-inch (1.6 millimeters thick) minimum.

Other details of design, including the density of the filler shall be NGC Standard.

Dimensions
The inside and outside diameters, and the thickness of a double-jacketed gasket (including tolerances), shall conform to NPS, class, and flange standard specified in the purchase order.

Standard Materials
The standard materials shall be a soft carbon steel jacket and a filler of Natfite having suitable binder. A jacket and/or filler or other materials may be specified by the purchaser.

Marking
Double-jacketed gaskets shall be tagged or, if the gasket size permits, marked with waterproof ink using symbols approximately 0.25-inch (6.4 millimeters) high, as follows:

1. Flange Size (NPS)
   
2. Class
   
3. Jacketed material indentificaion (number, name, or abbreviation) if other than a soft carbon steel
   
4. Filler material indentification, if other than Non-Asbestos
5. Indentification: API 601
   
6. Manufacturer's identification (trademark or name)
   
7. API 605 for gaskets to be used with flanges conforming to API 605; M.S.S.-SP-44 for gaskets designed for flanges conforming to M.S.S.-SP-44.