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The nut and bolt thread protector system is a patented, ultraviolet stabilized polyethylene thread protector, which seals nut and bolt threads in pressurized grease to effectively prevent corrosion and provide protection against physical damage.
The nut and bolt thread protector system is a patented, ultraviolet stabilized polyethylene thread protector, which seals nut and bolt threads in pressurized grease to effectively prevent corrosion and provide protection against physical damage. Laboratory corrosion testing has shown no corrosion on bolting using this system in 90-day ASTM B 117 salt spray tests and in 60-day wet sour gas tests. The system has proven its effectiveness for the corrosion protection of bolting in many marine applications. The corrosion protection provided allows removing the nut from the bolt after long exposure in corrosive environments without the use of special tools, and dramatically extends the useful life of the nut and bolt. The result is the elimination change-outs required from corrosion damage and significantly easier change outs when they are required for operational reasons, providing significant time savings for maintenance personnel. The system is state-of-the-art in corrosion protection for bolting in corrosive marine environments.
Keywords: bolting, polyethylene, corrosion, sour gas, marine environments
Since 1982, there has been a move to Thermal Sprayed Aluminum (TSA) coating in the “splash zone” of offshore structures. Our experience indicates that an experience applicator, good surface preparation and quality of wire combined to achieve required thickness and apply the sealer to seal the entire surface.
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Hot dip galvanizing steel articles after fabrication is one of the most widely used methods to provide corrosion protection. As a final step in the process, the hot dip galvanized coating is inspected for compliance with specifications. Correct measurement techniques and accurate interpretation of the results are necessary to provide an acceptable hot dip galvanized coating.
Corrosion Under Insulation (CUI) in pipingc systems consumes a significant percent of the maintenance budget in the petrochemical industry. Prevention of CUI by the use of (1) thermal spray aluminum, (2) stainless steel pipe, (3) expanded metal cages for personnel protection instead of insulation and (4) aluminum foil wrapping are discussed in terms of long term protection, installed cost and Life cycle cost.