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VacuumFurnaces.com is a Q&A community where vacuum furnace product and service suppliers connect with commercial and captive heat treaters to share their practical skills and know-how and to establish valuable relationships around niche topics of expertise with vacuum furnace end-users in operations, production, training, maintenance, marketing, sales, and engineering.
A properly designed system will have ports at the high points for venting air. While the system is running, vent the high points in the process discharge piping to remove air from the pipe. Most problems with the initial start-up are associated with filling the system and releasing air out of the process piping. Blocked air can resist or prevent proper water flow. We do NOT recommend automatic air release valves. They are too prone to leaks.
Source: Dry Coolers