Dewar Changeover System

Dewar changeover systems provide a continuous, uninterrupted flow of liquid nitrogen to the use point. When the primary source is empty, the system allows a simple switchover to a standby, full, secondary supply bank, thus eliminating liquid supply interruption.

CSM Cryogenic provides two options for dewar switchover system: Manual or Automatic

Automatic switchover stations will constantly monitor the liquid nitrogen supply using a liquid detection sensor. When the sensor detects liquid nitrogen supply interruption due to an empty dewar, the controller will command the vacuum-insulated valves to perform the supply switchover to the standby dewar.

Switchover stations are an efficient and economical alternative to installing a bulk storage tank with extensive vacuum-insulated pipelines.

Features & Benefits:

Vacuum insulation with lowest heat leak and lower liquid losses compared to traditional foam insulation
Easily expandable when the liquid cylinder demand increases
No moisture condensation, frosting or wet floor issue
Prevent liquid air condensation and fire hazard due to high oxygen concentration
Highest safety, prevents the operator from cold burns
Built-in nitrogen gas purging function to avoid moisture intrusion during dewar replacement
Safe-draining of residue liquid nitrogen to prevent spillage and cold burn accidents when disconnecting the hose from the dewar
Pressure equalizing function to avoid cross-filling between dewars when more than one dewar is manifolded together in one bank