Nu-Bolt/ I-Rod

Pipeline Industry


Corrosion at pipe supports is one of the leading causes of process piping failures, which can have potentially catastrophic results. All styles of pipe supports – including beam supports and pipe saddles – create crevices where water is trapped and held in constant contact with the pipe surface. Once corrosion starts in these pockets, it can quickly undercut the paint film and rapidly cause wall loss as it expands from the crevice. If these conditions are not addressed, entire sections of pipe can fail and require replacement. Deepwater developed the I-Rod pipe-support system specifically to ensure longer, safer lives for pipes by eliminating crevices between pipes and supports.


If we are to design the ideal solution, it should achieve the following goals:

  • Eliminate the crevice and thus the ability to hold water in contact with the pipe
  • Be simple to install either on new or existing piping systems not requiring hot work
  • Be inexpensive
  • Provide inspect ability and maintainability
  • Eliminate metal-to-metal contact.

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Nu-Bolt /  I-Rod

NU Bolt IRod

I-Rods are half-round rods made from a high-strength thermoplastic material. When placed between the pipe and the support, it achieves all the ideal solutions. The curved surface against the curved surface of the pipe minimizes contact area and water is shed from the pipe surface. The separation created also provides good access for inspection and maintenance while eliminating metal-to-metal contact.

Easily installed either in continuous lengths across the top of pipe support beams or as an integral part of a Nu-Bolt assembly to replace saddle clamps, the rods provide a cost-effective solution to the problem. I-Rods have been in service on hundreds of offshore platforms in the Gulf of Mexico since 1989. Performance has matched or exceeded all expectations of the operators specifying them.

Saddle clamps are widely used (especially on larger diameter pipe), as they offer excellent mechanical support. They are used on both horizontal and vertical pipe runs. They are, however, a potential corrosion hot spot. The saddle clamp often has a rubber liner designed to protect the coating on the pipe during installation.