Scuba Diving Sales and Services
mcssl.com Sherwood's First True Watch Computer Is Sure To Be A Diver's Favorite. The Amphos Is Sherwood's Newest Addition To An Already Strong Lineup Of Dive Computers. Sherwood's First True Watch Computer Is Sure To Be A Diver's Favorite. This Watch Computer Display Is Based On The Intuitive Wisdom3 Format,....
geekwire.com The late Paul Allen’s ship-hunting team aboard the Research Vessel Petrel has reached record new depths with its latest discovery. Vulcan Inc. released footage Wednesday of the deepest shipwreck ever…
ikelite.com Ambassador David Fleetham is one of the most published underwater photographers of all time and has shot hundreds of magazine covers with his Ikelite housings. So he knows a thing or two about how to set up his gear and ensure that he comes back with the shot and not a fancy bucket of water. Tune in...
Shearwater's NERD 2 has been in use with the Renton Fire Department Water Rescue Team in emergency situations. Firefighters Chris and Brandon talk about how ...
tdisdi.com It’s no secret that diving comes with risk. However, we increase that risk when we attempt to move our training forward too soon without practice and patience. It’s hard to be patient with ourselves in the age of social media when we see other advanced divers posting incredible photos of deep wr...
In the middle of this cow paddock, there's a hidden world. 😮
This world-class sinkhole attracts divers from across the globe. Imagine stumbling on it as you plough your paddock!
Join us every week on Wild Rides, where we explore Landline's most exciting stories. Watch the full series on Youtube: http://bit.ly/2NCKB9q. 📱
Charlotte County FL, News
Megalodon Tooth? 🦈 “Okay so yesterday while swimming... well more or less “rolling around in the ocean” (it was too rough to go out far at all) a man within 5 feet of us brought his hand up out of the water..... (remember we were all rolling around cooling off). He said something weird cut me... and he picked this up!!! I said OH MY GOSH that’s a huge sharks tooth. He didn’t know what it was until I said that. Christopher McMickle said you should have kept your mouth shut and let him chunk it back so we could have went after it, but I didn’t. lol I have to say it was meant for this man to find this rarity and since he said he would have never known what it was he let me take it for a few and take pics of it! I was in total awe of this massive thing. I couldn’t imagine this coming at you with any force much less a mouth full of them! Really really reminded me just how big God is and how small we really are. It was razor sharp and super heavy too!!Found at Myrtle Beach SC on 7/22/19!”
📷 Stacey McMickle
That time of year folks
In water or Just Slow Air/gas fills: PSI-PCI Articles
I recently received a copy of a note written by a Mike R. who says he knows his physics and therefore knows that using a wet tub when filling cylinders is beneficial. When just looking at physics we can all pretty much agree that heat transfer is far greater in water than in air. Coldwater divers concluded that fact long ago without any physics classes. However, claiming one law of physics justifies placing dive cylinders into typical dive store water tubs during fill as is still done at some air stations, simply isn’t the right thing to do. Fred Calhoun, writing in the Nov/Dec 1988 issue of NAUI NEWS, addressed the dry fill/wet fill issue accurately and in detail. Fred’s article is still distributed by PSI in its publication SCUBA CYLINDER REPRINT FILE. The PSI, Inc. textbook, INSPECTING CYLINDERS also explains how the tub fails to achieve what its promoters desire.
Water tubs often contribute to overfilling. There are a number of laws, industry policies and common sense that relate directly or indirectly to the use of water tubs and must be considered when filling cylinders. For example, it is illegal to overfill cylinders. Chilled water tubs can contribute to overfilled cylinders as can careless operators who think overfilling is alright as the water bath will drop pressure some. The Pressed Steel Tank Co. states “PST can provide no assurance that cylinders which have been subjected to over-pressurization are safe to use”. Further, structural damage during overfill is cumulative and irreversible. Hydro tests have been shown to be unreliable in detecting fatigue damage for overfill; therefore, even those overfilled cylinders which have passed hydro test may suffer a leak or rupture.
Many fill station operators (FSO) don’t know when, by law, a cylinder is full. Each DOT or ICC authorized cylinder must have a legible service pressure marking. A cylinder is full when an accurate gauge shows the marked service pressure at a temperature of 70 degrees F. Many air station gauges are seldom or never tested to assure accuracy. A cylinder filled slowly (as all cylinders should be) in chilled water will actually be overfilled when allowed to come to a higher ambient temperature. It will be difficult to defend an air station with a policy or reputation for overfilling cylinders. It is worth repeating, water tubs often contribute to overfilling.
Reported Water Tub Benefits
Several perceived benefits to using a water bath during fill are offered by tub proponents.
They include (1) cooling allows more air in the cylinder, (2) cooling allows faster fills, (3) the water will absorb the energy of a ruptured cylinder, (4) the tub itself provides explosion protection, and (5) the water bath provides cylinder cleaning.
Relating to benefit numbers one and two above, cylinders, when filled at the industry recommended fill rate of 300-600 psig/min, do not get hot. They may be warm but usually the temperature of the water is too close to the cylinder increase (about 100 to 110 degrees F. maximum) that the exchange rate is slow and low. We don’t want more air in the cylinder than is allowed by law. We don’t want fast fills, beyond the industry standard, if for no other reason, than cylinders will get warm and such practice makes the air station un-defendable.
The whole water tub thing began in the mid 1950’s when we knew very little about cylinders and their care. Steel cylinders got warm during what we now know to be fast fills. We didn’t know about prudent fill rates, and we often ignored the service pressure limit. Cylinders were filled quickly, removed from the water promptly and very little actual in-water temperature reduction took place. Then along came aluminum cylinders with walls nearly ½ inch thick.
The aluminum cylinders didn’t seem to get as warm. That was because although we still filled quickly, the heat generated within the cylinder took much longer to transfer to the outside. The water bath cylinder was removed from the water and sent on its way, long before the fast fill generated heat could be dissipated into the water.
What about the perceived benefit that the water bath will absorb explosive energy? There simply is not enough water between the FSO and the exploding cylinder to have any measurable effect whatsoever unless of course the tub is a nearby swimming pool. But, surely the tub itself will provide protection. Not true when you look at a great many of the water tubs in use today. Plastic garbage cans are used as well as sheet metal buckets of one sort or another. The energy within a full, exploding cylinder is so great, well over one million ft. lbs of potential kinetic energy, that all these containers break up and contribute shrapnel to injury and property damage. Even concrete block barriers usually disintegrate.
Ok, well at least a water bath cleans away harmful salt deposits or other contamination. Once again the facts don’t support this view. Most tubs used in dive stores today and fortunately there are fewer each year, do not regularly have the water changed. Fresh water is often added to make up for that which has evaporated or been spilled out onto the dive store floor but no total exchange. Consequently, contaminates left by one cylinder remain there for the next and the contamination level increases over time to where the following cylinders are bathed in contaminated water. Don’t forget that water puddle on the floor where customers or employees might slip and be injured. OSHA will not treat the store owner kindly.
Water Gets Inside
The greatest concern for water baths when filling cylinders is water entering into the cylinder. With water, metal and the ample oxygen in compressed air, cylinders can be damaged dramatically in a very short time. A study conducted by the University of Rhode Island revealed that under adverse conditions, a steel cylinder with a small amount of salt water (remember the fill tub may contain contaminated water) could be in danger of exploding within as little as 100 days. In a perfect facility, tub water does not enter the cylinder but, in many tubs, water is allowed to enter the valve aperture as well as the fill whip connector. Those water droplets are pushed into the cylinder.
The reader should note that in the above paragraph I referred to a perfect water tub system. A very few do exist, reinforced concrete and steel tubs serving both to hold water and as a blast shield. Cylinders placed into the water cannot drop below the valve aperture, fill whips can’t reach water level. It has a drain that is used often. Of course the fill station should be away from customers. Even this perfect water tub for filling is un-needed, although any true blast protection is a very wise investment. Nowhere else in the gas industry are cylinders routinely filled in a water tub.
High-pressure cylinders should not be filled in water tubs because the perceived benefit, when the laws and industry policies are followed, is negligible. There is real potential for overfilling cylinders, injecting water into the cylinder and developing a false sense of security that the bath somehow protects the FSO. Air station personnel deserve real protection. To that end, they need to be educated, have a safe air station and only fill cylinders that have been inspected by trained visual inspectors and hydrostatic re-qualifiers.
uwkdive.com Cave diving is a thrilling form of scuba diving for experienced and adventurous divers. Click now to discover its charms and dangers.
SIDEWALK SALE May 24,25 and 27th
Aquatic Adventures Of Florida
Time to start diving and time to upgrade to great equipment
Aquatic Adventures Of Florida
The recent edition of Dive Training Magazine has arrived. Come on in and get your free copy while supplies last. Say hello talk some scuba and see what dive trips we have scheduled.
Great way to tell others about your dive and not need to carry a lot of extra equipment. $299.95 Orders yours today!
Ocean Reef’s Full-Face Mask Recall
Not to be confused with the Aria snorkeling mask by the same Italian manufacturer, the U.S. Consumer Product Safety Commission are recalling about 1,000 Ocean Reef Neptune Space integrated diving masks, made between March and November 2018. They represent a potential hazard due to a possible restricted air-flow. Check if your mask is affected by comparing its serial number with those listed at www.oceanreefgroup.com. If yours is included, return the mask to where you bought it for a free replacement or refund.
oceanreefgroup.com Ocean Reef Group owns the brands OCEAN REEF (diving and snorkeling equipment) Nemo's Garden (underwater farming) and Mestel Safety (protection equipment)
IT's diving season! and to start it off We're planning these dives: Give us a call 813-788-6476
April 28 2019 Jupiter Florida Jupiter Dive Center 8AM show 9AM departure. Open to all divers. Cost $85.60 per person. Tanks are not included. Drift Dive. 4 spots
May 16 Gulf of Mexico Tanks A Lot Charter 4 Spots. Tanks not included. Cost $80.00 per person
May 18, Drift DIve Jupiter Florida Diveocean SCUBA Works 4 spots $85.60 per person, tanks not included
May 19, Drift DIve Jupiter Florida Diveocean SCUBA Works 4 spots $85.60 per person, tanks not included
May 20, Drift Dive Jupiter Florida Jupiter Dive Center 4 spots $85.60 per person, tanks not included
June 6 2019 Gulf of Mexico Tanks A Lot 3 spots $80.00 per person, tanks not included.
June 9 2019 12PM show 1PM depart Drift dive Wreck Treck Jupiter Florida Diveocean - AOW Course - Enriched Air Required 4 spots. $85.60 per person, tanks not included.
June 28 to 30 Blue Grotto Florida Camping and Diving Weekend. Tanks not included. Lets practice those skills. Pot luck Dinner Trivia Games, Connect 4 tournament underwater. Peak Buoyancy Control.
July 4 2019 Gulf of Mexico Tanks A Lot Charters $80.00 per person, tanks are not included.
July 7 2019 Drift Dive Jupiter Florida Jupiter Dive Center 3 spots $85.60 per person, tanks are not included.
July 27 Boynton Beach 1PM Loggerhead Dive Charters 3 spots $85.60 per person.
August 22 Drift Dive Jupiter Florida Enriched air required 3 spots $85.60 per person, tanks are not included.
August 23 3 tank drift dive with lunch Enriched Air required. Cost $107.00 per person, tanks not included.
August 24 Drift Dive Jupiter Florida $85.60 per person, tanks not included. AM and PM Diving AM 8AM show 9AM departure PM 12PM show 1PM departure
August 25 Drift Dive Jupiter Florida $85.60 per person, tanks not included. AM Dive 7AM report 8AM departure
September 8 2019 Drift Diving Jupiter Florida $85.60 per person, tanks not included.
This production will take you deep into Mexico's Yucatan where a team of cave explorers search for sacred relics within the water filled subterranean passage...
tdisdi.com Have you debated any of these three situational approaches to learning to dive? Learn more about how each option isn’t necessarily a bad option. Each has its own pros and cons list, you just have to figure out which is the best for you.
Florida Fish and Wildlife Commission Adopts New Regulations Protecting Sharks & Blue Heron Bridge Dive Site
After nearly two years of effort and input from DEMA and the diving public, the Florida Fish and Wildlife Commission (FWC) has adopted several new regulations that protect sharks in Florida waters and protect a world-renowned dive site in Palm Beach.
New Regulations for Shore-Based Shark Fishing Regulations
New shore-based shark fishing regulations adopted by the FWC on February 20 will require that all fishers, regardless of age, attend an online education program to educate about the importance of sharks and familiarize them with the new regulations. Fishers over 16 years old, including seniors, must also obtain a free, shore-based shark fishing permit, which is only available after completing the Commission-approved education program. The permit is also required if any fisher, while fishing from shore, is using a leader that is four feet long or more, and when the hook exceeds a specified size.
FWC regulations prohibit sharks from being landed on shore and to help ensure this is followed, shore fishers must now carry a device capable of cutting the line or hook. The shark must be cut free with as little remaining line and tackle as possible if the hook cannot be removed without raising the gills out of the water, or if the fisher would be at risk by removing the hook. This regulation helps reduce the incidence of sharks being removed completely from the water to photograph or measure the animal, which can impact the shark's health.
While supporting these new regulations, DEMA and others commented in favor of prohibiting shore-based shark fishing within 100 yards of designated public bathing beaches. Even though this is already a rule with regard to spear fishing in Florida, the FWC did not adopt any swimmer-shore-based shark fishing distance requirement at this time. DEMA will continue to work adoption of a common-sense distance requirement.
The revised shore-based shark fishing rule language will be posted on the FWC website, myfwc.com, and new rules go into effect on July 1, 2019. DEMA's comments to the FWC on shore-based shark fishing from April and December 2018, and February 2019, can be found here.
New Regulations Prohibit Collection of Aquarium-Sized Marine Life From the Blue Heron Bridge
DEMA has also been working with local Florida dive stores and citizen's groups to prohibit further collection of aquarium-sized marine life from the Blue Heron Bridge shore dive site in Palm Beach. This dive site is well known by snorkelers, divers and photographers, and was recently rated one of Florida's best shore dives by Sport Diver Magazine.
DEMA favors keeping this dive site accessible to all divers and snorkelers but asked the FWC to prohibit the taking of all marine life, creating a marine sanctuary. FWC did adopt regulations prohibiting the take of aquarium sized marine life while diving, but continues to allow hook and line fishing in the area. FWC's new regulations can be found on their website, and new rules for the Blue Heron Bridge go into effect on April 1, 2019. DEMA's comments on this important dive site can be found here.
DEMA appreciates the hard work of DEMA Members, citizen's groups in Florida, as well as members of DEMA's Public Policy Committee and Board of Directors for their support in these efforts. After two years of work, moving a government agency in this manner is a win for the diving industry!
DEMA's Public Policy Committee will conduct Dive-In-Day at the Capitol in Tallahassee Florida on March 19 and Florida Based DEMA Members are invited to participate. For more information, email us at [email protected].