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Chilled Water Piping Sizing
- Thread starter SRBKDW
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ASHRAE 2001 Fundamentals, Ch. 35:
1-4 ft friction loss per 100 ft of pipe; 2.5 ft as mean. For noise, keep velocity less than 4 feet per second (fps) for 2" dia. and smaller pipes. For greater than 2" dia., keep PD <4 ft per 100 ft pipe. If you reduce air and turbulence, you can exceed the 4 ft limit.
There are also tables in Ch. 35 that indicate:
4-10 fps for general service
3-7 fps for city water (per Crane & Carrier)
2-5 fps for city water (per Grinnell)
6-15 fps for boiler feed
4-7 fps for pump suction & drain lines
And max. water velocity to minimize erosion is 10-15 fps range, depending on hours of operation during the year.
1-4 ft friction loss per 100 ft of pipe; 2.5 ft as mean. For noise, keep velocity less than 4 feet per second (fps) for 2" dia. and smaller pipes. For greater than 2" dia., keep PD <4 ft per 100 ft pipe. If you reduce air and turbulence, you can exceed the 4 ft limit.
There are also tables in Ch. 35 that indicate:
4-10 fps for general service
3-7 fps for city water (per Crane & Carrier)
2-5 fps for city water (per Grinnell)
6-15 fps for boiler feed
4-7 fps for pump suction & drain lines
And max. water velocity to minimize erosion is 10-15 fps range, depending on hours of operation during the year.
If I am correct, mil inches seems to be a redundant term.
1 mil = 1/1000 th of an inch.(generally used to figure out corrosion, mils/year)
100 mils = 0.1 inch and 500 mils = 0.5 inch
so for 100 ft, it is 10 to 50 inches which is 0.83 to 4.2ft/100ft. So the values given by Imok seems to be ok.
Regards,
Believe it or not : Eratosthenes, a 3rd century BC true philologist, calculated circumference of earth with the help of a stick and it's shadow. The error was just 4% to the present day calcuated value.
1 mil = 1/1000 th of an inch.(generally used to figure out corrosion, mils/year)
100 mils = 0.1 inch and 500 mils = 0.5 inch
so for 100 ft, it is 10 to 50 inches which is 0.83 to 4.2ft/100ft. So the values given by Imok seems to be ok.
Regards,
Believe it or not : Eratosthenes, a 3rd century BC true philologist, calculated circumference of earth with the help of a stick and it's shadow. The error was just 4% to the present day calcuated value.
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