PADI ENRICHED AIR DIVER EXAMS SCRIPT 2025/2026
QUESTIONS WITH ANSWERS RATED A+
✔✔What color coding, stickers (decals) and tags should an enriched air cylinder have? -
✔✔1) Yellow cylinders should have a 4 inch green band with yellow or white lettering.
2) Non-yellow cylinders should have a 6 inch band with 1 inch of yellow on the top and
bottom, green in the middle, and yellow or white lettering.
3) There should be a dated visual inspection sticker.
4) There should be a sticker stating whether or not it meet oxygen service standards.
5) There should be a contents sticker or permanent tag that should , at a minimum, list
the oxygen content, the fill date, the maximum depth for the blend, and the name of the
person who analyzed the oxygen content to verify the blender's analysis.
✔✔What are the two primary concerns associated with filling enriched air cylinders, and
how are they avoided? - ✔✔1) Fire/explosion hazard.
2) Percentage of oxygen in the blend.
Have only reputable, qualified enriched air blenders fill enriched air cylinders for you.
✔✔Why should only qualified, reputable enriched air blenders fill enriched air cylinders?
- ✔✔They have the proper training and equipment to manage the two primary concerns
associated with enriched air cylinders.
✔✔What is the potential hazard of improper enriched air filling procedures? -
✔✔Fire/explosion and having a different mix of oxygen than you asked for.
✔✔What should you do if an enriched air cylinder or oxygen-service equipment is used
with standard compressed air? - ✔✔Have it serviced and cleaned by someone qualified
to service enriched air equipment.
✔✔How do you identify qualified enriched air blenders and enriched air service? -
✔✔By looking for gas quality verification, proper procedures, cylinder markings,
analysis, record keeping and other documentation showing evidence of training and
certification.
✔✔What are the two most commonly used blends of enriched air? - ✔✔EANx32 or
NOAA Nitrox 1, and EANx36 or NOAA Nitrox 2.
✔✔What is meant by oxygen partial pressure? - ✔✔The pressure exerted only by the
oxygen part of the blend.
✔✔How does exposure to increased oxygen partial pressure affect allowable dive time?
- ✔✔It decreases it.
QUESTIONS WITH ANSWERS RATED A+
✔✔What color coding, stickers (decals) and tags should an enriched air cylinder have? -
✔✔1) Yellow cylinders should have a 4 inch green band with yellow or white lettering.
2) Non-yellow cylinders should have a 6 inch band with 1 inch of yellow on the top and
bottom, green in the middle, and yellow or white lettering.
3) There should be a dated visual inspection sticker.
4) There should be a sticker stating whether or not it meet oxygen service standards.
5) There should be a contents sticker or permanent tag that should , at a minimum, list
the oxygen content, the fill date, the maximum depth for the blend, and the name of the
person who analyzed the oxygen content to verify the blender's analysis.
✔✔What are the two primary concerns associated with filling enriched air cylinders, and
how are they avoided? - ✔✔1) Fire/explosion hazard.
2) Percentage of oxygen in the blend.
Have only reputable, qualified enriched air blenders fill enriched air cylinders for you.
✔✔Why should only qualified, reputable enriched air blenders fill enriched air cylinders?
- ✔✔They have the proper training and equipment to manage the two primary concerns
associated with enriched air cylinders.
✔✔What is the potential hazard of improper enriched air filling procedures? -
✔✔Fire/explosion and having a different mix of oxygen than you asked for.
✔✔What should you do if an enriched air cylinder or oxygen-service equipment is used
with standard compressed air? - ✔✔Have it serviced and cleaned by someone qualified
to service enriched air equipment.
✔✔How do you identify qualified enriched air blenders and enriched air service? -
✔✔By looking for gas quality verification, proper procedures, cylinder markings,
analysis, record keeping and other documentation showing evidence of training and
certification.
✔✔What are the two most commonly used blends of enriched air? - ✔✔EANx32 or
NOAA Nitrox 1, and EANx36 or NOAA Nitrox 2.
✔✔What is meant by oxygen partial pressure? - ✔✔The pressure exerted only by the
oxygen part of the blend.
✔✔How does exposure to increased oxygen partial pressure affect allowable dive time?
- ✔✔It decreases it.
