CHT Hyperbaric Chamber Operations & Safety 3

Question 1

What is the maximum allowable oxygen concentration in a multiplace chamber breathing air, per NFPA 99 guidelines?

Accepted Answer

23.5%

Answer

NFPA 99 sets 23.5% as the oxygen-enriched atmosphere threshold; chamber ambient O2 must be maintained below this level to reduce fire risk.

Question 2

A CHT notices the chamber's oxygen analyzer reads 25% during a multiplace treatment. What is the priority action?

Accepted Answer

Increase ventilation rate to purge excess oxygen

Answer

Elevated chamber O2 above 23.5% creates an oxygen-enriched fire hazard; increasing ventilation to purge excess O2 is the correct first response.

Question 3

Which U.S. Navy Treatment Table is most commonly used for AGE (arterial gas embolism) in a clinical hyperbaric facility?

Accepted Answer

Table 6A

Answer

U.S. Navy Treatment Table 6A is the standard table for arterial gas embolism, reaching 60 fsw with oxygen and air breathing cycles.

Question 4

What does the term 'fsw' represent in hyperbaric medicine?

Accepted Answer

Feet of salt water — a unit of pressure depth

Answer

fsw stands for feet of sea water, a common depth/pressure unit in U.S. hyperbaric practice; 33 fsw = 1 ATA gauge pressure.

Question 5

Why must petroleum-based lubricants NEVER be used on oxygen-system fittings in a hyperbaric chamber?

Accepted Answer

They can ignite explosively when exposed to high-pressure oxygen

Answer

Petroleum-based lubricants are highly combustible and can spontaneously ignite upon contact with high-pressure oxygen, causing catastrophic fire or explosion.

(CHT) Certified Hyperbaric Technician Practice Test

(CHT) Certified Hyperbaric Technician Practice Test

CHT Hyperbaric Chamber Operations & Safety 3