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Pipe sizes depends upon the fluid pressure, temperature and its velocity. As the fluid temperature,
pressure & velocity are very low, small size pipes like 1/2?, 3/4? diameter are mostly used for carrying water
and gas in household usage. These pipes are connected by screwed fittings. Refineries, power plant etc.
uses large size pipes like 24”, 42” diameter. Here, the pipes are joined using welded connections.
In these pipes, fluid pressure and temperature are very high so we cannot use screwed fittings.