Internal Cryogenic Gas Traps

Internal Gas Traps are typically installed in vertical drops to liquid nitrogen use points with non-vacuum jacketed terminations. The gas trap works by ‘trapping’ a pocket of gas inside the line when liquid nitrogen is shut-off. This gas pocket prevents liquid nitrogen from reaching the non-vj connection in essence insulating the joint.

Benefits of using a gas trap include:

• Reduced Heat Leak – When liquid nitrogen is not flowing, the heat leak of a non-vacuum jacketed termination is about 200 BTU/hour (60 Watts). With an internal gas trap the heat leak is only about 0.5 BTU/hour (0.15 Watts).
• Eliminates Ice. When liquid nitrogen is not flowing your non-vacuum jacketed terminations maintain a constantly dripping ice ball. With an internal gas trap, this ice ball is eliminated.