Welding is the most common method of attachment flanges to the pipes. Therefore professional manufacturers producing stainless steel flanges (as well as the related equipment: tube plates, fitting tools, butt weld fittings, etc.), e.g. AlexanderComley, provide consultations and training to guarantee proper flanges installation.
Connection of flat flanges requires using special fasteners, which include nuts, bolts, studs and shims. Bolt is a fastener for connecting various structures and machine parts; it is a threaded rod with four or hexagonal head at one end. Nut is a component with a threaded hole, designed for connection of the unit. Shim is placed under the bolt head or nut. Using shims is necessary to enlarge the area of support (in case of insufficient rigidity of the anvil) to align the surface of the support and compensate for the increased diameter of the screw holes. If there is a bias of nuts and screws, it is customary to use the oblique and spherical shims. However, there is a dozen of shims for a variety of technical situations (sealings, springs, locks, etc.).
Hairpin is a metallic rod having threads at both ends. One end is screwed into the first piece and the other piece is pressed against the first one when the nut is screwed.
Securing is covered in a good number of regulatory documents and subjected to a range of requirements. So for flanged joints used fasteners adapted to the special requirements. All the requirements are specific to the use of its products and focus on particular conditions, such as pressure and environmental peculiarities. (more…)