Pipe failure cited in Marcus Hook refinery fire.
Fire officials blame a May 2009 fire that destroyed part of Sunoco’s Marcus Hook refinery on a rusty 10-inch pipe that ruptured and caused a catastrophic natural gas leak. The pipe failure was caused by external corrosion on the bottom of the pipe ..
Nu-Bolt assemblies have been in service for over 20 years without a single reported failure.
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 harsh operating environments associated with offshore oil and gas production and coastal process facilities.
Polyshrink is applied over the shank of the Nu-Bolt to protect the paint system during installation. Polyshrink is not designed to protect the Nu-Bolt. The material is a cross linked, high-compressive-strength, UV-stable polyolefin, which can remain in service in temperatures up to 230 °F (110 °C).
Coatings - The Nu-Bolt is available in 316 SS or carbon steel with one of two coatings: Hot-dip galvanized or SermaGard®. SermaGard is a corrosion-resistant coating reliable in even the harshest 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:
Abstract: Corrosion at pipe supports is one of the leading causes of process-piping failure. This paper will discuss the various corrosion mechanisms that occur at pipe supports as well as successful and unsuccessful attempts at controlling the problem.
From Pipeline & Gas Journal: During routine inspections of offshore oil and gas production facilities in the Gulf of Mexico, corrosion on piping systems is often noted. Deepwater's I-Rod brand of pipe supports tackles this nagging problem with near perfect results.
The first structure to specify I-Rod pipe supports was inspected 13 years after original installation. The results are stunning - not a single Nu-Bolt had failed.
The I-Rod's half-round shape minimizes contact between the pipe and the support, eliminating the crevice. Keeping water out minimizes corrosion.
The Nu-Bolt assembly 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. Nu-Bolt assemblies 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.
Online ordering coming soon!
To order any of our I-Rod brand pipe supports, including I-Rod strips, Nu-Bolts or I-Rod Clips, please contact Beverly at 713-983-7117 ext. 222, or you may inquire by email.