The reserve header in a cryogenic liquid cylinder manifold system shall have sufficient cylinder connections for an average day's supply, but NOT fewer than how many connections?

The reserve header in a cryogenic liquid cylinder manifold system shall have sufficient cylinder connections for an average day's supply, but NOT fewer than how many connections?

• A. 4
• B. 3
• C. 1
• D. 2

Answer: (B)

This question tests the minimum number of cylinder connections the reserve header must provide to cover a full day of supply. The reserve header is there to ensure continuous operation if the primary source is down or during cylinder changes, so it must be able to deliver a full day’s gas without interruption. Three connections give enough parallel supply paths to meet typical daily consumption while allowing swapping or adding cylinders without starving the system; two connections would usually not suffice for a full day, while four would exceed the minimum requirement. Therefore, the smallest acceptable number is three.

This question tests the minimum number of cylinder connections the reserve header must provide to cover a full day of supply. The reserve header is there to ensure continuous operation if the primary source is down or during cylinder changes, so it must be able to deliver a full day’s gas without interruption. Three connections give enough parallel supply paths to meet typical daily consumption while allowing swapping or adding cylinders without starving the system; two connections would usually not suffice for a full day, while four would exceed the minimum requirement. Therefore, the smallest acceptable number is three.