INSULATING TUBES SECRETS

Insulating Tubes Many thanks for The good information on your internet site. I am at the moment designing a cryogenic vessel for storing nitrogen. I am planning a double-walled vessel and wish to vacuum the Room concerning the partitions.Why does the 400BIPA needs to be tightened using a torque of 50Nm and also the 300BIPA having a torque of 30Nm?F