Nu-Bolt assembly for the prevention corrosion at pipe supports
in conjunction with Deepwater Corrosion Inc.
The Nu-Bolt has been used to prevent crevice at pipe supports all over the world
for almost 20 years, without any reported failures.
Designed by corrosion engineers, the Nu-Bolt assembly combines the half round I-Rod support with a modified pipe U-Bolt. A variety of corrosion resistant treatments provide reliable, long term service in the severe operating environments associated with offshore oil and gas production and coastal process facilities.
Polyshrink is applied over the shank of the U-Bolt to protect the paint system during installation. Polyshrink is not designed to protect the U-Bolt. The material is a cross linked, high-compressive-strength, UV Stable polyolefin. It can remain in service in temperatures up to 230 F (110 C).
Coatings - The Bolt itself is available in 316 SS, or with one of two coating options: Hot-Dip Galvanize, or SermaGard®. SermaGard is a corrosion resistant coating reliable in even the most harsh offshore conditions.
Half Round I-Rod Support - The standard I-Rod material works extremely well for most process piping conditions. In situations with extreme operating temperatures, Deepwater can substitute the more resistant I-Rod HT material. Deepwater has also begun to offer PEEK material for environments that prove too severe for either (though these instances are rather rare). For details about all three materials:
The NU-bolt & I-Rod assembly is used in the following:
I-Rod & Nu-Bolt assembly fitted onto a pipeline.
The I-Rod's half-round shape minimizes contact between the pipe and the support, eliminating the crevice. Keeping water out keeps corrosion at bay.
The Nu-bolt assembly also provides an electrically isolated stand-off between the pipe and the supporting beam or saddle clamp. This allows for easy maintenance and inspection, while preventing galvanic corrosion between dissimilar metals (the pipe and support).
I-Rod also has excellent compressive strength and a very low friction coefficient. Some Nu-bolts have been in continuous operation since 1989 with no reported failures. See the 13-year study on one of the first platforms to specify I-Rod for all of the structure's pipe supports.
Crevice corrosion can be eliminated with Nu-Bolt & I-Rod assembly.