Pump pipe diameter
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I would like to ask: if 4 water pumps with DN150 inlet pipes are connected in parallel, what size should the main inlet pipe be? Is there any formula for calculating this?
The diameters of the pump inlet pipe and the inlet main pipe are generally determined by the recommended flow rate and pressure drop requirements. If there is no requirement for pressure drop, the pipe diameter is generally calculated based on the recommended minimum flow velocity. Since the GB 50316-2000 (2008 edition) Code for Design of Industrial Metal Piping does not specify a recommended flow rate, the recommended flow rate is generally determined according to design manuals; select the appropriate design manual based on your industry. Or, the design specifications for related industries can be followed; for example, for power pipelines or pipelines in power plants, the recommended flow velocity can be determined according to Table 5.1.3 of DL/T 5054-2016. The recommended flow velocity for water pipes in other types of factories can also be found in DL/T 5054-2016.