Master Diver Certification

3510 Words Mar 29th, 2013 15 Pages
Master Diver

Diving Equipment

Open circuit demand scuba is the most commonly used by recreational divers, but closed circuit and semi-closed rebreathers are now available.

Test Pressure: the pressure to which the cylinder is subjected to during hydrostatic testing. For a 200 bar cylinder it is 300 bars, for a 232 bar cylinder it is 348 bars.

If internal inspection reveals corrosion, it may have to be cleaned by tumbling. The tumbling process involves filling the cylinder approximately half full of an abrasive material such as carbide chips, or aluminum oxide chips, and rotating it for a number of hours.

A dual valve for a single cylinder, known as a Y-valve, or an H-valve, allows a diver to mount 2 regulator systems on
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There are two types of pressure gauges for determining the amount of air in a scuba cylinder. A surface cylinder pressure gauge is used to check the amount of air in the cylinder above water. It attaches to the cylinder valve in the same manner as a regulator to provide a one-time check of cylinder pressure. A bleed valve relieves trapped pressure so the gauge can be removed when the cylinder valve has been closed.

Dive Computers may allow longer dive times because they compensate for time spent at varying depths throughout a dive compared to the “square” dive profiles required for the use of most tables.

A compressor operates on the principle of Boyle’s Law – reducing the volume increases the pressure. The air is compressed in stages.

The Diving Environment

The wavelength is the horizontal distance between successive crests (or troughs), and the period is the time required for two successive crests to pass a given point.

Plunging Breakers release their energy quickly. The type of surf forms from large swells over a moderately steep bottom. As the swell moves toward shore, the waves steepen quickly and break suddenly. These waves break with tremendous force, and they are the most hazardous type.

Surf Passages

▪ Have your BC partially inflated for slight positive buoyancy ▪ Be fully equipped ▪ Get as close to the water’s edge as possible