How are the inlet and outlet pipe diameters determined for a fixed-tube-sheet heat exchanger?
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I have now come into contact with a fixed-tube-sheet steam-water heat exchanger, with an operating pressure of 1.0 MPa. The shell-side steam flow rate is 973 cubic feet per hour. The fluid is hot water, with a flow rate of 204 cubic meters per hour. How is the diameter of the inlet and outlet pipes for steam and hot water calculated?
Determining the pipe diameter essentially means determining the flow velocity in the inlet and outlet pipes; once the flow velocity is known, choosing the pipe diameter becomes no problem. For this issue, the flow velocities are roughly as follows: Steam flow velocity: u=18~24 m/s; Water flow velocity: u=0.8~2.5 m/s (slow flow velocity results in less resistance)
Check page 3-72 of the chemical process manual :)
Flow rate = flow velocity × area. First, determine an appropriate flow velocity to calculate the pipe diameter, and then round it to a standard pipe diameter
It seems that on the GB, there are inlet and outlet nozzle diameters corresponding to the inner diameter of the shell
Excessively high flow rates result in a significant pressure drop; it is necessary to first select an appropriate flow rate, and then determine the pipe diameter based on the flow rate and volume flow rate
I agree with the opinion above – the diameter should be determined based on the flow rate and an appropriate flow velocity. I specifically created a small Excel tool today; if you need it, I can send it to you. It’s not possible to upload attachments here.
I agree with you; the standard equipment should specify the inlet and outlet pipe diameters.
The pipe diameter can be determined based on the flow rate of the medium, and then the value of ρv2 can be calculated