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Hold Time

thread378-8299

Hold Time

Hold Time

(OP)
I need to hold a product (ie.milk) for 360 seconds @ 90C
in a holding tube.
The tube diameter is 0.75" and the flowrate is 300L/h.
What length of tubing will I need to achieve this? I've
calculated 6315 meters, but that seems like alot! Can
someone help me out here.
Thanks.
Replies continue below

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RE: Hold Time

(OP)
The pressure in the tubing is about 600psi.

RE: Hold Time

The length is calculated by multiplying flow velocity times the required hold time.  In your case, 300 L/hr is equal to 5.085 in^3/s.  The cross sectional area of 0.75" diameter is 0.442 in^2.  Dividing the flow rate by the pipe area gives a fluid velocity of 11.51 in/s.  Multiplying the fluid velocity by the hold time give a length of 4114 inches, or 105.2 m, or 345.3 ft.

RE: Hold Time

(OP)
Thanks butelja.
I made a stupid mistake dividing by 60 to get seconds
instead of 3600 (from L/h ---> L/s)

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