Issues regarding heat exchanger gaskets

Since the standards JB/T 4718, JB/T 4719, and JB/T 4720 you mentioned have been revoked, the standards for gaskets used in these shell-and-tube heat exchangers have actually been updated to GB/T 913, GB/T 912, and GB/T 911. Among these, GB/T 913 mainly describes the types and dimensions of non-metallic gaskets ； GB/T 912 covers the types and dimensions of metal wound gaskets ； GB/T 911 specifies the types and dimensions of metal flat gaskets. To determine the model of the tube box gasket, it is necessary to consider the actual requirements of the equipment, its operating conditions, as well as the specific requirements of these standards when making a choice. It is also possible to consider consulting the manufacturer or professional engineers for specific guidance. If necessary, relevant industry experience or actual testing can also be referred to for determination. .

According to the current energy standards, products such as NB/T47024, 47025, and 47026 come without sealing strips in between

HG/T20592-20635-2009 \"Steel Pipe Flanges, Gaskets, and Fasteners\"

According to the current manufacturing standards for energy equipment, NB/T 47024, NB/T 47025, and NB/T 47026, these standards require that heat exchanger gaskets have no sealing strips in the middle. This is because in the design of modern equipment structures, gaskets do not require additional sealing strips to achieve a sealing effect; their material and structural design alone are sufficient to provide good sealing performance. Therefore, if the gaskets you purchase are made in accordance with these standards, they will not come with sealing strips. If your device requires gaskets with sealing strips, you may need to find a manufacturer that specializes in producing such products for custom orders, or consider using alternative options that meet the requirements of your device. Additionally, professional equipment repair and maintenance services can also be sought to resolve this issue. .