To accurately measure flow, it is necessary to eliminate various electromagnetic interferences and effectively amplify the flow signal. The performance of the flow converter should be enhanced. A microprocessor-based converter should be used to control the excitation voltage. The excitation mode and frequency should be selected based on the characteristics of the liquid being measured to eliminate in-phase and quadrature effects. However, the improved instrument has a complex structure and high costs. The proper installation of metal spiral wound gaskets with inner and outer rings is crucial. The transmitter should be installed in a dry and well-ventilated indoor area, avoiding locations with excessively high ambient temperatures and strong vibrations. Machines with strong magnetic fields, such as large motors and transformers, should be avoided. Installation in areas with corrosive gases should be prevented. The installation location should be convenient for maintenance. These are the environmental conditions to ensure the normal operation of the transmitter.
The metal spiral wound gasket is a protective gasket processed by combining special metal strips with other materials. It has a circular appearance and can be used at mechanical installation points. Its color is mainly black. Generally speaking, the inner ring is black, and the outer side is also black. This also indicates that the inner ring of the metal spiral wound gasket is mainly composed of graphite, while the outer side's primary material is various special metal composites.
The flexible graphite metal spiral wound gasket is made of stainless steel wire and flexible graphite. The inner and outer rings are made of rigid rings. The design and structure are reasonable and comply with regulations. It has good sealing performance and reduced elasticity. It is suitable for corrosive substances at high temperatures, high pressures, low temperatures, vacuum, and with rapidly changing operating parameters. It is also suitable for liquefied gas storage and distribution stations, crude oil, chemicals, oil refining, and tank top holes.
Key design parameters for stainless steel spiral wound gaskets: Design parameters: HG297 Nominal diameter: DN15600mm Nominal pressure: PN1.6, 2.5, 4.0, 6.4 MPa Applicable temperature: -40+450°C. 2. Types of stainless steel spiral wound gaskets are suitable for convex surfaces, standard Type A, tongue-and-groove surfaces with inner rings, Type B, concave-convex surfaces with outer rings, Type C, convex surfaces with inner and outer rings, and Type D.
The specifications and dimensions of stainless steel spiral wound gaskets should comply with the regulations of China's Administration ZJJGZ (2000) No. 6 document, which clearly stipulates that the sealing surface of the container *Dao flange should adopt a high-neck butt-welded flange, and the stainless steel spiral wound gasket and threaded materials should be a combination of 30-35CrMo steel. B. Spiral wound gaskets for heat exchangers are generally divided into standard types and those with outer ring metal spiral wound gaskets.
