PADI O2 Exposure, EAD, and EANx Tables

Created by Chickenhawk25 

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What is an equivalent air depth (EAD)?

An adjusted depth that accounts for the reduced nitrogen in enriched air.

How do you find the EAD for various depths and enriched air blends using the DSAT Equivalent Air Depth Table?

Find your actual depth on the left, then find the EAD to the right in the column for the appropriate enriched air blend.

How do you find your no decompression limits on the RDP using EADs?

Use the EAD on the RDP in place of the actual depth.

How do you plan repetitive dives with EADs and the RDP when using the same enriched air blend for the dives?

Use EADs in all places.

How do you plan repetitive dives with EADs and the RDP when using different enriched air blends for the dives?

You switch to the new blend's EAD when you go to Table 3 on the RDP Table.

How do you use The Enriched Air Recreational Diver Planner?

Almost exactly like the air RDP Table, but for the specific air blend specified.

How do you determine the maximum depth limit and contingency depth limit for different enriched air blends using the DSAT Equivalent Air Depth Table?

On the Equivalent Air Depth Table, the last depth with an EAD above the horizontal line is the maximum depth for each blend. The last EAD listed below the line corresponds the the contingency depth limit.

How do you determine the oxygen partial pressure for different depths and different enriched air blends using the DSAT Equivalent Air Depth Table?

It's right next to the EAD.

How do you use the DSAT Oxygen Exposure Table to stay within accepted oxygen limits?

Find your oxygen partial pressure at the top, then go down the column until you find your dive time. Add your total exposures from all dives within a 24 hour period.

What is the recommended minimum surface interval using enriched air?

1 hour

How do you determine the allowable dive time on a repetitive enriched air dive?

Find your maximum no decompression limit and your maximum oxygen exposure limit and use the lower time.

Why would you use the Equivalent Air Depth Formula instead of the Equivalent Air Depth Table?

If your actual depth and/or EAD fall between depths on the Equivalent Air Depth Table and the RDP, respectively, and you want to maximize your allowable no decompression time. Also, if you want to determine EADs with enriched air blends with less than 30% oxygen or more than 40%.

How do you use the Equivalent Air Depth formula?

Just plug in your depth and oxygen percent as a decimal.

Why would you use the oxygen partial pressure formula instead of the Equivalent Air Depth Table?

When you want to maximize your allowable oxygen exposure by eliminating unnecessary rounding.

How do you use the oxygen partial pressure formula?

Just plug in your depth and oxygen percent as a decimal.

Why would you use the maximum depth formula instead of thee Equivalent Air Depth Table?

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How do you use the maximum depth formula?

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Why are eniched air nitrox blends with more than 40% oxygen not commonly used in recreational diving with open circuit scuba?

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Why are enriched air blends with 40% to 60% oxygen desirable in semiclosed circuit recreational scuba?

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What is the primary equipment consideration when using blends with 40% to 60% oxygen?

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How do you determine EADs, oxygen partial pressures and maximum depths when using blends with 40% to 60% oxygen?

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