How is the length of the bolts used for connection calculated? How is the bolt length at a loose-flange connection calculated?
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The medium used in a certain project is not highly toxic; it is flammable under categories A and B, has corrosive properties, operates at low pressure, and the temperature is below 150 degrees. Linered pipes are widely used, with pipes and fittings connected by flanges; the client requires that some connections be made using loose-flange connections. 1. Where are loose flanges used? How to inform the supplier? 2. How is the bolt length required for PL connections of lined pipes and pipe fittings calculated? How is the bolt length at a loose-flange connection calculated? 3. The design institute recommended using the special grade 35CrMO with anti-corrosion treatment, while the owner said that the commercial grade 8.8 would be sufficient. 4. The design institute recommends the use of washers in accordance with the standard GB/T97.2, but their strength does not match that of the bolts. https://www.sohu.com/a/406277948_100052790?qq-pf-to=pcqq.c2c https://www.sohu.com/na/406277948_100052790 https://m.sohu.com/a/406277948_100052790
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If the owner specifies any areas that require loose-flange connections, just inform the supplier – they are aware of the relevant standards for lined pipes. As for the bolts you mentioned, you can ask the supplier or consult the product catalog.