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Hydro-test pressure and holding times vary for different design codes. For example, the ASME SEC VIII Div.1 general hydro-test pressure will be1.3 x design pressure (minor factors may vary for this equation as well) and for piping design codes, the hydro-test pressure will be ASME B31.4,B31.8 1.5 xdesign pressure.

Bellows of an expansion joint going through a hydro-test pressure.

Ducts are a series of sectioned tubes, which transfer either heated or cooled air from the furnace or air conditioner, throughout the building.

Large diameter duct work for ammonia plant
Large diameter duct work