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Galvanization involves coating iron or steel with zinc to prevent rusting. While this treatment extends the life of pipes, it also alters their surface texture. The roughness created by the galvanization process can increase the friction factor compared to smooth-walled pipes. This increase implies greater energy requirements for pumping fluids through galvanized pipes, particularly in systems that rely on water or other low-viscosity fluids.
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What makes vintage metal lunch boxes so appealing is their craftsmanship. Unlike today's disposable lunch containers, these boxes were designed to last. Made from sturdy metal, they often featured secure latches and handles, making them both functional and durable. The artwork was typically lithographed, which ensured vibrant colors and intricate details that captivated the eyes. Each lunch box was not just a container for food; it was a canvas showcasing the culture and trends of the time.
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