CHT Equipment Operation & Maintenance 2

Question 1

Which type of valve is most commonly used as a primary shut-off on hyperbaric chamber oxygen supply lines due to its clean-service compatibility?

Accepted Answer

Ball valve

Answer

Ball valves are preferred on oxygen lines because they open fully with a quarter-turn, leave no dead space, and are available in oxygen-clean configurations.

Question 2

What is the minimum recommended frequency for changing the desiccant in a hyperbaric chamber's air drying system under normal operational use?

Accepted Answer

Per manufacturer schedule or when saturation indicator changes

Answer

Desiccant replacement frequency is driven by the manufacturer's schedule and color-indicator saturation, not a fixed calendar interval.

Question 3

A hyperbaric technician notices the chamber's built-in breathing system (BIBS) mask check valve is leaking gas into the chamber environment. The IMMEDIATE corrective action is to:

Accepted Answer

Remove the mask from service and replace the check valve before next use

Answer

A leaking BIBS check valve enriches the chamber oxygen concentration and creates a fire hazard, so the mask must be removed from service immediately.

Question 4

What is the purpose of a pressure-relief valve (PRV) on a hyperbaric chamber hull?

Accepted Answer

To prevent the chamber from exceeding its maximum allowable working pressure

Answer

The PRV is a safety device that automatically vents gas if chamber pressure exceeds the MAWP, protecting structural integrity.

Question 5

When lubricating O-ring seals on a hyperbaric chamber door, which lubricant is acceptable for use?

Accepted Answer

Oxygen-compatible, silicone-based lubricant approved for the seal material

Answer

Only oxygen-compatible, material-compatible lubricants (typically silicone-based) may be used to prevent seal degradation and fire risk.

(CHT) Certified Hyperbaric Technician Practice Test

(CHT) Certified Hyperbaric Technician Practice Test

CHT Equipment Operation & Maintenance 2