ps version

All lines are 3/8" polyflo, (this is the OD), which has an ID of 6.0 mm. The flow was measured at the end of the long return line, just before the degassing can, and found to be 2036 cc/min. This is only 15% above the flow required for FC75.
Reducing the length of the return line by 22' increases the flow to 2340 cc/min, which is 33% above nominal, and replacing the other long section with a short piece increases the flow rate to 2840 cc/min, which is 60% above nominal. Therefore we will replace the long hoses with 1/2" polyflo, in order to have enough of a safety margin.

In John Bernardin's report I found the following numbers:

• LDO max power dissipation: 60W
• environmental heat load: 20-40W
• Water flow rate: 220 cc/min
• FC75 flow rate: 1760 cc/min leading to a pressure drop of ~10 psi, usinf 50m of 9mm (3/8") ID tubing.