I am designing a sample cooler for Condensate sample. The Tie points for sampling station are discharge and suction of Condensate pump. The condensate is at 90 C and to be cooled upto 25 C. The line run will be around 20 feet (Tieing from discharge Pressure gauge to Suction drain valve of the pump).

Since Pressure drop is very high(800 Kpa) and line length is not much , the flow rate is huge ( through 1" line).

What is a good idea to control the flow of sample ? Use an orifice or a Globe valve ??

Utility water at 10 C/300 Kpa  is used for cooling. How can I calculate Utility water flowrate?

Pretty standard design.  You can probably find examples in your plant now if you go out and look.

Normal is block valves in and out of cooler on process and utility side.  Make sure your sample point is after the cooler and before the block valve.  Valve on sample point should be a needle valve to limit the flow of sampled material.

I do not recommend that you design your own.
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