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Everlube Products UK Develops New Subsea Fastener Coating

18th May 2015

Often the failure of subsea bolts has been a major cause of gas or oil leakage in offshore installations, so along with the access difficulties for maintenance teams, preventing the premature failure of these components is certainly desirable wherever possible. 

A comprehensive range of corrosion tests have been carried out on our newly developed Everlube 1174® Coating, in combination with a variety of pre-treatments.

The results show that Everlube 1174® will provide 1500hrs of salt spray protection when applied over a phosphate pre-treatment, 2500hrs over Zinc plating and 5000hrs over a Cermet basecoat.  We tested two bolts and after 1500hrs in the salt spray cabinet as per ASTM B117, the bolts showed near zero corrosion and easy removal of the nut.

Everlube 1174® coated bolts after 1500hrs salt spray testing
Everlube 1174® coated bolts after 1500hrs salt spray testing showing near zero corrosion and easy removal of the nut.

Everlube 1174® is a low VOC, low friction, load bearing, thin film, resin-bonded, corrosion resistant, thermoset PTFE coating.

Everlube 1174® also acts as an excellent insulating shield between dissimilar metals due to its high dielectric strength.  This helps to alleviate the problem of galvanic corrosion.

In addition, subsea bolting systems can come into contact with a wide variety of chemicals, from those present in sea water to those used in various oil extraction equipment.  Hydraulic fluids for example, are extremely aggressive and can readily breakdown low grade coating systems.  Everlube 1174® has been formulated to resist all current hydraulic fluids used in the oil and gas industry.

Typical applications include wellheads, Xmas tress flanges, structural connections and flanges.

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Often the failure of subsea bolts has been a major cause of gas or oil leakage in offshore installations, so along with the access difficulties for

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