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An architect specified Corten steel panels for the outer wall of a farmhouse. The fabricator bought ordinary mild steel plates, painted them rust-brown, and delivered them to site. For a few months the wall looked right. Then the paint began to peel, and bare mild steel started to rust unevenly, the way ordinary steel does.

A fabricator needed 3 tonnes of 50 x 6 mm MS flats for a gate and railing job. He ordered “3 tonnes” and assumed it would be enough for 250 pieces of 6 metre length. It was not. A 50 x 6 mm flat weighs about 2.35 kg per metre, so 3 tonnes gives roughly

A fabricator once ordered “boiler plate” for a pressure vessel job and only wrote the thickness on the purchase order. The plates arrived, looked fine, and were cut and welded. At inspection, the client asked for the mill test certificate. It showed a general structural grade, not a pressure vessel grade. The whole batch had

A buyer orders 200 pipes for a plumbing and fire line. The quote is per kg, the truck arrives, and the invoice is far higher than the estimate. Nothing was wrong with the pipes. The estimate simply used the wrong wall thickness. Pipe weight is what you pay for, so it pays to know it

Quick answer: GI pipes come in three wall-thickness classes: Light, Medium, and Heavy. The class decides pressure rating, not the outer diameter. Order by NB size AND class, or you risk pipes that either burst under pressure or cost you more than you needed. The Order That Failed a Pressure Test A plumbing contractor once