CHS Hyperbaric Equipment Operation & Safety 2 — Questions and Answers
Question 1: What is the minimum required wall thickness for a monoplace hyperbaric chamber rated at 3 ATA working pressure?
- Determined by ASME PVHO-1 calculations based on diameter and material (Correct answer)
- Always 0.5 inches regardless of diameter
- Always 1.0 inch regardless of material
- Set by the manufacturer at a fixed 0.75 inches
Correct answer: Determined by ASME PVHO-1 calculations based on diameter and material
ASME PVHO-1 requires wall thickness to be calculated based on the vessel's diameter, material yield strength, and maximum allowable working pressure.
Question 2: During a hyperbaric treatment, the oxygen partial pressure (PO2) inside a multiplace chamber should not exceed which value to minimize oxygen toxicity risk?
- 1.6 ATA (Correct answer)
- 2.0 ATA
- 2.4 ATA
- 3.0 ATA
Correct answer: 1.6 ATA
A PO2 greater than 1.6 ATA significantly increases the risk of central nervous system oxygen toxicity during hyperbaric treatments.
Question 3: Which type of valve is preferred at the oxygen inlet of a hyperbaric chamber due to its oxygen-compatible construction?
- Oxygen-cleaned stainless steel globe valve (Correct answer)
- Standard brass ball valve
- PVC gate valve
- Carbon steel butterfly valve
Correct answer: Oxygen-cleaned stainless steel globe valve
Oxygen service requires valves that are oxygen-cleaned, use compatible materials, and are rated for high-pressure oxygen to prevent ignition hazards.
Question 4: A chamber operator notices the pressure relief valve activating repeatedly during treatment. The FIRST action should be to:
- Identify and resolve the source of overpressure before continuing (Correct answer)
- Replace the relief valve immediately
- Seal the relief valve outlet temporarily
- Increase the chamber pressure setpoint
Correct answer: Identify and resolve the source of overpressure before continuing
Repeated relief valve activation indicates a control or supply problem that must be diagnosed and corrected before safe operation can continue.
Question 5: What is the primary purpose of an oxygen monitor inside a multiplace hyperbaric chamber?
- To detect elevated oxygen concentrations that increase fire risk (Correct answer)
- To measure the patient's arterial oxygen saturation
- To control the chamber compression rate
- To verify the purity of nitrogen used for pressurization
Correct answer: To detect elevated oxygen concentrations that increase fire risk
Ambient oxygen monitors detect dangerous enrichment of the chamber atmosphere, which dramatically increases the risk of fire or explosion.
Question 6: The inside observer in a multiplace chamber must be trained to perform which critical task independently?
- Emergency egress and manual decompression procedures (Correct answer)
- Recalibrate the oxygen analyzer mid-dive
- Replace the CO2 scrubber canister during treatment
- Adjust the main compressor output
Correct answer: Emergency egress and manual decompression procedures
Inside observers must be capable of initiating emergency decompression and guiding patient egress in case of outside crew incapacitation.
Question 7: Which NFPA standard specifically addresses fire protection for hyperbaric facilities?
- NFPA 99 (Correct answer)
- NFPA 101
- NFPA 13
- NFPA 72
Correct answer: NFPA 99
NFPA 99 (Health Care Facilities Code) contains specific requirements for hyperbaric facilities including construction, electrical, and fire safety.
CHS Hyperbaric Equipment Operation & Safety 2
What is the minimum required wall thickness for a monoplace hyperbaric chamber rated at 3 ATA working pressure?