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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.
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Laboratory testing to qualify several materials for high strength fastener applications for two projects has shown that, in the presence of cathodic protection, nickel alloys 718 and 725 offer the best resistance to hydrogen embrittlement and are available in the strength/size required for high pressure and moderate temperature applications for sub-sea applications.
The effect of the combined uncertainties on the performance of bolts in drilling and production systems using a Bayesian probabilistic approach. Also - managing the performance of bolts.