Metal Jacketed Gasket

Metal Jacketed Gasket

A spiral wound gasket consists of three elements:

1. Outer ring. Made of carbon steel, this outer ring is sometimes called the centering ring or guide ring. It’s used to center the gasket when you insert it into a bolted flange joint. 
2. Inner ring. The inner ring is pivotal for the gasket because it prevents windings from buckling inside the pipe. When a gasket buckles, parts of it get sucked into the pipe. From there, pieces of the gasket will typically flow through the pipeline until they get caught on something. Often, they’ll get wrapped around rotating equipment like a pump. The mess that results is known as a “bird’s nest.” Inner rings help you avoid this problem. 
3. Sealing element. As you might guess from the name, the sealing element creates the seal that prevents leaks. A sealing element encompasses both windings and filler material. Most spiral wound gaskets in oil and gas refineries will use a flexible graphite filler material rated for high temperatures. A flexible graphite filler also allows the gasket to be more tolerant of flange distortion and joint misalignment. Polytetrafluoroethylene (PTFE) is another common filler material. PTFE is not rated for high-temperature applications, however. Meanwhile, most winding materials in refineries will be stainless steel and monel. 

Metal Jacketed Gasket is based on 0.2-0.6 mm thick soft metallic stripe which acts as the shell material, filled with non-nature fibre like graphite, asbestos or ceramics. It often needs some certain shape rods when used in heat exchanger. We can produce square, oval and other sort of shapes metal jacketed gasket. According to their shell material and filler material, the maximum operating pressure and temperature are normally from 6.0 to 10.0MPa and 1000°C, respectively. The resilience for metal jacketed gasket is low which is mainly depended on the materials. But high quality flanges with good surface and preload capability are required. It is usually used for heat exchanger, pressure vessel and valve flange, and so on.