aquata Dry Diving Suit Руководство пользователя - Страница 15

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Pre-dive buoyancy check

Buoyancy compensation with weights wearing your full equipment.

1a. Select undergarment considering the water temperature and adjust your weight belt

accordingly. Start practicing in shallow water, with all your gear. Open the exhaust valve

completely (counter clockwise to full —) for Minimum air volume in the suit, deflate the BC

completely while breathing normally.

1b. Add or remove weights until you have neutral buoyancy and can hang feet down, your

body floating perpendicular to the water surface with the crown of your head touching it.

In this pose, with your arms horizontally in front of your chest the exhaust valve should be

at the highest point of the suit.

Add some weight to compensate for the calculated increase of buoyancy and to allow

a deco stop.

2a. calculate the weight of the air that you expect to consume during the dive. Compen-

sate for the expected weight loss by adding the same weight in lead to your weight belt.

Adding some additional weight, say 2-3 lbs/1-1,5 kg, will allow you the option of a safety

stop.

2b. Inflate your dry suit and adjust the exhaust valve clockwise (towards +) until you've

reached the state of neutral buoyancy.

2c. Start the descent by exhaling and elevate your elbow (or press the cover of your

exhaust valve) to decrease the amount of air in your drysuit. While descending, inflate air

to compensate the loss of buoyancy and to avoid suit squeeze.

Post-dive buoyancy check

See if you are able to maintain neutral buoyancy at 9 feet/3meter with less than 50

BAR/725 PSI in your tank(s).

How to calculate what increase in buoyancy that can be expected at the end

of the dive:

When using metric units, the service pressure (P1), the atmospheric pressure (P2)

and the tank volume (V1) will be known data. By using Boyle's equation to calculate the

volume of the air in you tank(s) plus knowing the density of air (D), you will be able to

calculate the weight of the air (W).

Ex.1: A typical tank volume is 10 liter with a service pressure of 200 BAR. Boyle's equa-

tion will give the weight: W = (P1*V1)/P2*D = (200 b*10l)/ 1 b* 1.29 g/l = 2580 g. Add

a max. of 1500 g for the option of a decompression stop.

If you are diving in the USA, the known data will be the volume of air in your tank(s)

(V2), and the service pressure (P1).

A typical US tank will hold a volume of 80 CF air at a service pressure of 3000 PSI. The

weight of the air (W) is calculated like: W= V2*D = 80 CF*0,081 lbs/CF = 6.48 lbs. Add

a max. of 3 lbs for the option of a decompression stop. If you, for some reason, need to

know the volume of your tank(s), use Boyle's equation: V1 = V2*P2/P1 = 80 CF*14.7

PS/3000 PSI = 0.392 CF = 677 CI.

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