Question on non-condensables in ammonia

[Magoo]

Hi CD,
generally low stage boosters in negitve range have shaft seal areas at positve oil pressure, oil sealing and feeding seal compartment. Once stopped and idle they can possibly leak to atmosphere at positve pressure internally

[Segei]

Hi CD,
generally low stage boosters in negitve range have shaft seal areas at positve oil pressure, oil sealing and feeding seal compartment. Once stopped and idle they can possibly leak to atmosphere at positve pressure internally

It depends of manufacturer.I know that Frick compressors have positive pressure, but Micom compressors have negative pressure during operation.