How to Read a Heat Number and an EN 10204 3.1 Certificate
What a heat number is, where to find it on a valve, flange or fitting, and how to check a mill test certificate against the part in your hand.
Why a Magnet Does Not Prove Stainless Steel Grade
The magnet test is the most common check on site and the least reliable. Here is why, and what actually confirms 304 or 316.
Class 150 vs PN16 Flanges: Same Look, Different Bolting
Class 150 and PN16 flanges look alike on the shelf but do not bolt together. A size-by-size comparison and how to tell them apart.
Why a Cheap Flange Is Often a Thin Flange
A flange priced far below the market usually has a reason. Three quick checks for thickness and dimensions before you accept it.
Inside a Threaded Ball Valve: What Each Part Does
Ball, seats, stem, packing and body: how a two-piece threaded ball valve works, what the markings mean, and what to check before you order.
Five Checks Before You Sign for a Valve Delivery
A valve can leave the factory right and still arrive wrong. Five quick checks to make at the gate, and what to do if one fails.
What “WCB” Means on a Cast Steel Valve
ASTM A216 Grade WCB explained: what the marking tells you, where WCB valves are used, and how WCB compares with cast iron and cast stainless.
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