New System Evacuation Procedure

[witold1]

I have new Ice Rink system under construction. What is a recommended vacuum pressure we should evacuate system to and how long to keep it under such vacuum to approve the installation as vacuum-leek-free? Thanks.
-Witold1

[Peter_1]

I can only speak for Europe: leaktesting with vacuumed is prohibited. You must pressurize at 1.1 max operating pressure.
If you vacuum, you only have a pressure difference of 1 bar and this is not a real life situation.
I doubt this is common practice in the US.

Is it with NH3?

Why not with OFN?

[Brian_UK]

What does it say in the project specification about the system tests to be performed.

What does the equipment supplier require?

This information should be available to you on site.

[US Iceman]

Vacuums are used for dehydration of the refrigeration system only. If you want to ensure the system is pressure-tight, use a pressure test.

Then once you are sure the system is leak-free, then pull a vacuum to assure the system has NO moisture in it.