Draft:Corrosion under pipe supports
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Comment: Might be LLM-generated —pythoncoder (talk | contribs) 23:03, 2 December 2025 (UTC)
Corrosion under pipe supports (CUPS) is a form of external pipe corrosion that happens at the point where a pipe and its supporting structure meets. This commonly occurs at beams, saddles, shoes, and clamps. This interface, between pipe and support, traps water and other contaminants which creates a crevice like environment. This leads to the degradation of coatings and localized corrosion.[1][2] CUPS is a main reason behind touch point damage and corrosion in above ground piping systems.[3]
Because the affected area is often concealed it can be difficult to identify by sight. This means that NDT techniques are necessary to locate and monitor this type of corrosion.[4] Technical industry literature and research has been increasingly treating CUPS as a distinct type of corrosion mechanism.[1][2]
Mechanism
[edit]At pipe supports a narrow gap is formed between the pipe and the support. This creates a crevice where moisture, dissolved salts, and other contaminants accumulate. Limited air exchange, coating damage (from movement or thermal expansion), and galvanic interaction can produce differential aeration cells that accelerate corrosion on the pipe.[1][2] This often results in corrosion directly beneath, or adjacent to, the contact area.
Locations and risk factors
[edit]CUPS is often found on steel piping that is exposed to marine and/or industrial environments, long above ground lines, and insulated piping in refineries and petrochemical plants.[2] High humidity, salt water spray, frequent cycles of wet/dry, poor drainage, damaged paint coatings, and insulation systems that retain moisture are all increased risk factors.[1]
Inspection and detection
[edit]Traditional inspection methods are labor intensive and require that the pipe be lifted from the support to allow for examination. To reduce this a wide range of NDT methods are used to screen for corrosion under pipe supports. These include guided wave testing, phased array ultrasonic techniques, and medium range ultrasonics that have been adapted for use in the tight confines found at supports.[4][2]
Mitigation and design considerations
[edit]The most common strategies for CUPS combines rack and support design, proper material selection, and frequent inspections. Common measures are improving drainage and access at supports, minimizing coating damage, using more specialized coatings and insulation systems that reduce water retention, and introducing non-metallic liners and isolating components that reduce crevice formations and eliminate galvanic coupling.[1][3] Manufacturer and industry guidance for pipe supports emphasizes CUPS as an important factor in proper support selection and layout.[5]
See also
[edit]References
[edit]- ^ a b c d e "Corrosion Under Pipe Supports". Materials Technology Institute. 15 August 2023. Retrieved 2 December 2025.
- ^ a b c d e "Inspection of Corrosion Under Pipe Supports" (PDF). TWI. Retrieved 2 December 2025.
- ^ a b "Corrosion Under Pipe Supports Services". Acuren. Retrieved 2 December 2025.
- ^ a b "Inspecting for Corrosion Under Pipe Supports – Eddyfi Technologies Has it (Un)Covered". Eddyfi Technologies. 3 August 2022. Retrieved 2 December 2025.
- ^ "Corrosion Under Pipe Support (CUPS)". RedLineIPS. Retrieved 2 December 2025.
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