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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.
I don't think you should go from here. The size depends on the number of barrels that you need to transport at a time (that should be given) and the water flow range that you have. then you select a size accordingly and calculate velocity and pressure drop to confirm the adequacy of your selection and that the requirement of the number of barrels is met, or change the size if necessary.
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.
In McQuay pipe sizer:-
4f/s maximum for pipe below/equal to 50mm and 4ft/100ft for pipe greater than 65mm pipe.
here is the online link which helps you a lot.
https://www.tlv.com/global/TI/calculator/water-pipe-sizing-velocity.html
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