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what normally your basis in chilled water pipes sizing? share your experience.
This is the common practice check ASHRAE HVAC Fundamentals [2013] F22 SI page 22.5 :
A variety of upper limits of water velocity and/or pressure drop in piping and piping systems is used. One recommendation places a velocity limit of 1.2 m/s for 50 mm pipe and smaller, and a pressure drop limit of 400 Pa/m for piping over 50 mm. Other guidelines are based on the type of service (Table 8) or the annual operating hours (Table 9). These limitations are imposed either to control the levels of pipe and valve noise, erosion, and water hammer pressure or for economic reasons. Carrier (1960) recommends that the velocity not exceed 4.6 m/s in any case.
here is the online link which helps you a lot.
https://www.tlv.com/global/TI/calculator/water-pipe-sizing-velocity.html
In McQuay pipe sizer:-
4f/s maximum for pipe below/equal to 50mm and 4ft/100ft for pipe greater than 65mm pipe.
the best way to size chilled water pipes is of small diameter. and the it should be make up of copper (cu) because it can't get corried and remain cool for a long time and pressure doesn't drop here.