How to distinguish between loose rust and true rust on spiral steel pipes?

Release date:

2023-02-28

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Steel Pipe Knowledge

Spiral steel pipes typically cannot be stored in large quantities at the production facility before delivery to the end user, so distributors must keep some inventory on hand. However, most distributors lack spacious indoor storage facilities and rely primarily on outdoor warehouses; leaving spiral steel pipes exposed outdoors inevitably subjects them to wind and sun. So, how can you tell the difference between surface scale and actual rust on spiral steel pipes?

Spiral steel pipes typically cannot be stored in large quantities at the production facility before being delivered to the end user, so distributors must keep some inventory on hand. However, distributors usually lack spacious indoor storage facilities and rely mostly on outdoor warehouses; leaving spiral steel pipes exposed outdoors inevitably subjects them to wind and sun. So, how can we distinguish between surface scale and actual rust on spiral steel pipes?

As the name suggests, “floating rust” is a layer of rust that has risen to the surface of the spiral steel pipe and can be removed with a simple wipe using a towel or other material. In short, floating rust is essentially not true rust and is considered a normal condition.

Rust on spiral steel pipes develops over time; for pipes exposed outdoors to wind and sunlight for at least one year or longer, the rusted surface will exhibit pitting of varying sizes. This is a key distinction between surface scale and true rust.

Spiral welded steel pipe is manufactured by sawing billets into segments at the steel mill, followed by heating in an annular furnace, piercing, sizing, straightening, cooling, end‑trimming, and packaging to produce a finished product that meets quality standards. Spiral welded steel pipe is primarily used for oil and natural gas transmission pipelines, with its dimensions specified as outer diameter × wall thickness. Such pipes are available in both single‑sided and double‑sided weld configurations, and they must pass hydrostatic testing, with weld tensile strength and cold‑bend performance conforming to applicable regulations.

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Quality Inspection of Spiral Welded Steel Pipes

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