Discussion on the material of instrument junction boxes and bypass pipes in gasoline hydrogenation units
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In the new projects, all instrument accessories are of type 30408; can other materials be used as a substitute to reduce costs?
What exactly does the owner mean by accessories for instruments? Wiring ducts, cable trays, columns, pressure transfer pipes, bolts?
Hello, what I’m referring to is mainly explosion-proof boxes. Flexible tubes, gland fittings, and such
It is recommended to select materials in accordance with the requirements of the design institute. If cost is a concern, using anti-static resin for the instrument junction box is also an option; however, it is best to consult with the design institute first
Cost savings must be achieved on the basis of proper design. The materials chosen and the designs have all been evaluated; therefore, to make changes to the materials, design documentation is required in principle. Of course, some changes that clearly do not affect safety or the manufacturing process can still be made, and responsibility for such changes also lies with the relevant party. But it’s all related to experience. For example, in the case of explosion-proof boxes, the cost of 304SS is already low; however, the cost of carbon steel isn’t necessarily low, as the thickness varies. The resin value might be even higher. Will the carbon steel corrode in its surrounding environment? The selection of head types involves considerations regarding strength, as well as the choice of materials for use in corrosive environments. Therefore, to change the material, it is best to consult with the designer.