Tuesday, October 28, 2014

Scuba Diving Regulators - How Do They Function?

Scuba diving is now a popular leisure activity which is being enjoyed by a lot of people. This is because there is nothing more exhilarating than to be able to have that close encounter with the flourishing beauty that lies beneath the sea and swimming amongst them for long periods of time. If you are planning to have a prolonged underwater exploration, bear in mind that your breathing apparatus must be one which is very efficient in giving your lungs and body the air that it needs. Naturally, you would definitely need a good cylinder with enough compressed air to give you adequate underwater exploration time. However, this would not be enough without the presence of a good scuba diving regulator.



Naturally, because of the huge amount of compressed air that these cylinders hold, there is tremendous pressure which must be controlled so that you would be able to comfortably breathe it. Scuba diving regulators work by controlling the amount of compressed air that the scuba cylinder releases to your body.

Normally, scuba diving regulators act on two stages. The first stage is the one that really reduces the pressure that comes out directly from the air cylinder. It is directly connected to the scuba cylinder with an A-clamp and is fitted over the valve which is found at the uppermost portion of the tank. The first stage regulators are designed in such a way that it minimizes the risk of an internal corrosion which can be fatal if breathed in. It is also equipped with thermal insulators to prevent the regulator from freezing when subjected to low temperatures.


The second stage is integrated into the mouthpiece which further reduces the pressure so that divers can breathe the air in comfortably. The mouthpiece portion of the scuba diving regulators opens immediately when the diver breathes in and almost immediately closes when the diver exhales. It is normally attached to the first stage through a sturdy hose which usually dangles over the shoulder. There are many types of second stage scuba diving regulators but the most common among them is one which has a downstream valve. This type of second stage regulator includes a diaphragm which allows for the valve to open and close.

Recognizing how scuba diving regulators work is very important since it might just be the knowledge that could save you, or that of your fellow diver, should an emergency situation suddenly arises.


Reference: http://ezinearticles.com/?Scuba-Diving-Regulators---How-Do-They-Function?&id=5413298

Thursday, October 23, 2014

Thursday Featured Video: Basic Cave Diving

Planning to go on cave diving soon? Watch this video first. Remember, it's always advisable to be on the safe side at all times.



Video Courtesy of: Ramon Llaneza Technical Diving
Check out his channel: Technical Diving  

Tuesday, October 21, 2014

How to Use a Dry Suit for Scuba Diving

Dry suits are comfy, warm alternatives to wet suits. But they take added skill to use. Follow these tips to make sure your dry suit functions properly.



  • Choose a dry suit that fits properly. Height should be comparable, wrists and neck seals should be snug, and the body should be baggy enough to allow a thin layer of clothes beneath.
  • Dress in thermal underlayers and thick socks.
  • Run a wax stick generously along the hefty suit zipper, which is generally located on the back between the shoulder blades.
  • Step into the dry suit and pull your feet all the way into the attached booties.
  • Coat the wrist and neck seals with silicone spray (available in most dive shops).
  • Pull on the remainder of the suit.

  • Get a friend to carefully zip you up.
  • Don your regular scuba gear, including ankle weights of about one to two pounds each.
  • Attach the additional low-pressure inflator hose from the regulator first stage to the dry suit valve, which is generally located on the suit's chest.
  • Inflate the dry suit and buoyancy compensator slightly before entering the water. The dry suit inflation button is located in the center of the valve.
  • Wear gloves and a hood to complete the cold-water attire.
  • Inflate the dry suit as you descend ' both to help buoyancy and to keep you warm.
  • Press the exhaust valve (located right next to the inflation valve or on one of the suit's arms) to deflate the suit upon ascent.



Reference: http://www.ehow.com/how_9906_dry-suit-scuba.html



Tuesday, October 14, 2014

3 of the Best Scuba Diving Destinations in Brazil

Brazil. The land of football and samba. But those are not the only things that make the country special. In fact, it has one of the loveliest and diverse coastlines in the entire world. Not only that, thanks to ideal weather conditions, the country is also perfect for different kinds of water-based activities, and yes, one of them is scuba diving.

fr www.takepart.com

Without further ado, here's a list of the best diving spots the country has to offer:

Arrairal do Cabo

Located in the Brazilian state of Rio de Janeiro, Arrairal do Cabo is blessed with white sandy beaches and crystal clear waters that are teeming with a very diverse marine life. This is the place where you'll get to see different types of fish, as well as turtles, lobsters, squid and octopuses.

Buzios

Buzios or formally Armação dos Búzios is a resort town located in the state of Rio de Janeiro. Offering calmness, direct contact with nature and stunning views, Buzios is a favorite destination for Brazilians, as well as Argentinians.

The beaches located on the west side are clear and calm while those on the eastern side are much more wilder as they face the open sea, hence they attract surfers and water sports enthusiasts.

Some of the best places to scuba dive here include Ilha da Ancora, Ilha Feia, Ilhas Gravatas and Filhote.

Fernando de Noronha

This archipelago is comprised of 21 islands and islets in the Atlantic Ocean, and it's located about 354 km offshore from the Brazilian coast. Administratively, Fernando de Noronha belongs to the Brazilian state of Pernambuco and was declared as a World Heritage Site by UNESCO in 2001 due to the importance of its environment. In fact, visitors who come here are charged an environmental preservation fee.

fr www.fanpop.com


The beaches on this archipelago are promoted for tourism and recreational diving. Divers don't need a wetsuit when diving to depths of 30 to 40 meters thanks to the South Equatorial Current that brings warm water from Africa to the island. Underwater visibility on the island reaches up to 50 meters.

Tuesday, October 7, 2014

How Do Gas Laws Relate With SCUBA Diving?

Boyle's Law
Named after its discoverer Robert Boyle, Boyle's Law states: As pressure increases, volume decreases. As pressure decreases, volume increases.

This is relevant to scuba diving in the context of depth and water pressure. Pressure increases with depth, and thus volume will be decreased as a descent is made and will increase upon ascent. This means that every air space on the diver, both dead air space (such as the mask) and live air spaces (such as the lungs), must be paid attention to to avoid problems such as decompression sickness and lung over-expansion injuries. Therefore breathing techniques, equalizing air spaces and never holding your breath are affected by Boyle's law. In addition buoyancy can be affected too, with wetsuit material being compressed and thus becoming less buoyant.

from travel.usnews.com

Dalton's Law
John Dalton stated in his law that "the pressure exerted by a mixture of gases is equal to the sum of the pressures that would be exerted by the gases individually". This is relevant to scuba diving with regard to the individual gases in a mix that will compress equally as outside pressure increases.

Henry's Law
Henry's Law, named for William Henry, states that "the mass of a gas which dissolves in a volume of liquid is proportional to the pressure of the gas". This essentially says that as pressure increases then our bodies will absorb more gas. Thus at greater depths the amount of gas absorbed into our body will be greater. This means that deeper dives have to be calculated shorter to allow for this, or risk the possibility of decompression sickness.

Charles' Law
Charles'; Law says that cooling a gas decreases the volume of the gas. If the volume does not change then pressure must decrease. This means that if a scuba tank is heated then the pressure will increase, which accounts for accidents that have happened with scuba tanks being left in hot environments.

Diving
The physics of diving take into account all of the laws mentioned in applying relative standards, in order that divers can dive safely with knowledge of the effects of gas laws on their bodies and their dive times. Most dive rules are derived with respect to the gas laws and research continues into their effect on the human body while diving.

from www.theguardian.com



Reference: http://www.ehow.com/about_6692411_do-laws-relate-scuba-diving_.html