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In industrial piping systems, selecting the right fasteners that can both endure corrosion and offer great mechanical strength is extremely critical. Locally, in both Riyadh and Dammam areas, a rising number of engineers are opting for PTFE Coated Bolts to their flange connections under very high stress, which are also exposed to chlorides, heat, and chemical agents. These bolts combine two characteristics, first a steel core type A193 B7 or B8 and second, a very thin layer of Polytetrafluoroethylene (PTFE), which not only stops the sticking but also has very low friction. PTFE-coated bolts and nuts are available in a variety of sizes from M6 to M36 and even 1½ inches in diameter.

Generally, these kinds of bolts are the ones found in ASME B16.5 and B16.47 standards for flanges from classes 150 to 2500. They are very precise in terms of dimensions and, on the other hand, have a coating thickness that does not break the rule according to ASTM F1941 standards. When it comes to chemical industry-related projects in Jeddah and Jubail, it is imperative to get your products only from dependable and genuine suppliers. Pipingmaterial.sa is an online platform that is very helpful in this regard because only those manufacturers are listed there who can present you with their detailed mill certificates, ISO 9001 test report, torque specifications, etc. Duplex and Super Duplex steels are the materials that are most frequently requested in this case since such environments are susceptible to sulfide stress cracking and consequently, the use of highly resistant corrosion materials would lead to the ability of the installation to even survive after multiple cycles of shutdown and startup.

Changes in the torque must also be considered since the presence of the PTFE coating influences the torque-tension relationship resulting in a scenario where 0.75 0.85 of the torque of the uncoated one is needed to achieve the correct clamp load without causing damage to the threads. Especially, when corroded by exposure to the atmosphere or marine environment, Hot Dip Galvanized Bolts are the material that in most cases are specified by the designers. Zinc layer thickness complies fully with the requirements of ASTM A153 and ISO 1461 and the amount of zinc along with its uniformity even on the most difficult parts of the bolts (threads and heads) is guaranteed. Heavily hex-head bolts and those of grades 5.6 to 8.8 are the main ones which are used in the structural and pipe support applications and if anything, that is hardly surprising considering they are perfectly compatible with cathodic protection system and it can be said with a high level of confidence the long service life of the system in a very harsh environment.