The tube and shell side of the heat exchanger operates in intermittent conditions. What gasket is better to use?

Try corrugated tooth composite gaskets, or bimetal self-sealing corrugated tooth composite gaskets

The heat exchangers in our factory basically use corrugated tooth composite pads. The specific structure is: 304 inside + graphite outside, the effect is okay.

When selecting suitable gaskets, pay attention to the material of the bolts. Try to choose bolts with a thermal expansion coefficient similar to that of the heat exchange tube shell. Your problem may lie with the bolts.

Temperature, pressure, and medium should be considered, and gasket detection should be strengthened!

Flanges, gaskets and fasteners to match

The corrugated tooth composite gasket is a metal composite gasket. Generally, a precision lathe or a special milling machine is used to machine the two sides of the metal flat gasket into concentric wave-shaped grooves. The tooth tips on the upper and lower sides are staggered to each other, so that it has better compression rebound performance. Since the contact with other sealing surfaces is multiple concentric circle line contacts, it has a labyrinth sealing effect. According to different media and working conditions, flexible graphite, PTFE, asbestos-free plates or other can be selected. It uses some soft metal and is pasted on both sides of the gasket. It takes advantage of the sealing properties of the soft covering layer and the strength and elasticity of the metal to achieve a better sealing effect. In most cases, we recommend graphite as the sealing layer. When the medium reacts to graphite or requires a clean environment, we recommend choosing the newly launched expanded PTFE with excellent performance as the adhesive layer. Metal corrugated composite gaskets generally do not require a large pressing force to achieve the sealing effect. Corrugated tooth composite gaskets can also be used directly without an adhesive sealing layer, and can also achieve good sealing effects. Compared with toothed combination gaskets, they have better compression resilience performance, especially in large-sized smoke and gas pipelines, low pressure, high temperature, or twisted and uneven flanges, and have a more significant sealing effect. Special working conditions such as extremely high temperature, strong corrosion, etc. require special materials. Metal corrugated composite gaskets. We can also produce the following special materials upon request.: Stainless steel 304L, 321, 316TI, 309, 347, 410, duplex steel (2205, 31803), Monel (400), INCONEL (600, 625), INCOLOY (800, 825), Hastelloy HASTELLO (B2, C276), titanium (T2) and other special stainless steel or alloy materials.

Performance characteristics of metal corrugated composite gasket: 1. Excellent compression and rebound performance, it can achieve excellent sealing performance even under low pressing force. It is especially suitable for occasions with high temperature, high pressure and alternating working conditions. It is an ideal substitute for traditional metal spiral wound gaskets and metal-coated gaskets. 2. The metal corrugated composite gasket does not damage the sealing surface and is easy to disassemble. 3. Wide range of use. It can be used for both low and high temperatures (-200°C~+700°C), as well as low and high pressure (vacuum~25Mpa). Corrugated composite gaskets made of corresponding metal skeleton materials can be used in most corrosive fluid situations. 4. The metal corrugated body part can be reused, which is of great significance for larger gaskets or gaskets of special materials such as heat exchanger gaskets. Application scope of metal corrugated composite gasket: Metal corrugated composite gaskets are mainly used in medium, high pressure and high temperature pressure vessels in petroleum, chemical, metallurgy, electric power, shipbuilding, machinery and other industries to seal the joints of heat exchangers, condensers and pipe flanges.