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John If you read IANTD standards they do not specify Al or Steel cylinders. They never have. Now if your instructor has a private policy of no Al then as his/her private policy they may do so. But it is not a IANTD standards issue. Some of us especially when diving dry do not like the use of Al 80 (12L) cylinders. this is due to the buoyancy and limited gas supply for many divers. Before you post items on the list why not go to the IANTD web page and see what the standards say I agree as a person with your instructor on the Al back mount cylinders Because of having to carry additional weight to compensate for the buoyancy change with a dry suit and heavy underwear. In IANTD courses we have drills that check theability of a diver to use different equipment here are a couple of these From IANTD Standards 5. Remove the harness and cylinders from a simulated- diver in less than 1 ½ minutes. (Student so who exceed the time limit on this skill must have a quick-release added to their harness). 6. Divers using a quick-release on their harness or backpack must, in confined water, swim the system while the instructor disconnects the quick-release to simulate a failure. The student is to swim the system demonstrating control of buoyancy and body positioning with the quick disconnected for sufficient duration to satisfy the instructor that the student is capable of managing. 7. Demonstrate an ability to respond to a single-bladder BCD failure by the two methods listed below. (Students using gear configurations that prevent accomplishment of these two skills will be required to wear a redundant BCD. Students who already have a redundant BCD or dry suit may use one of these alternates after attempting perform the methods without the use of the alternative.) a. Completely deflate BCD and swim while maintaining buoyancy control for at least two minutes. b. Completely deflate BCD, ascend safely to the surface, and remain afloat for at least 3 minutes. Note on the drill of swimming the cylinders with a BC failure Using Favor (OMS) 12L-!-l 13L -17L and 19L with Al stages . In the last two years I have not had a diver in a 3 mil wet suit that could not do this. I have swam the 13 L with two Al 40 stages from 170 If you go to press steel cylinders are the 104 no one that I have seen can do it. On the other hand most of us prefer Al stages. Respectfully yours, Tom Mount CEO IANTD World HQ http://www.iantd.com ----- Original Message ----- From: John Grogan <john@ro*.co*.uk*> To: Tom Mount <TOM.MOUNT@wo*.at*.ne*> Cc: techdiver <techdiver@aquanaut.com> Sent: Thursday, November 04, 1999 6:50 AM Subject: IANTD IT standards > Tom / List, > > It would appear (based on IANTD standards in the UK) that steel bottles must > be used for training and that Aluminium bottles simply do not cut it...... > > the following is part of a message I had from someone trying to do an IT > course ...... > > "I've recently been told :( that I can't do the IANTD Technical Instructor > course with the instructor trainer I wanted to, unless I switch back from > ali to steel stage bottles. The instructor argued that [my] alis will float > at the end of the dive if 2/3 of gas is used and that they regard this as > dangerous in sea water decompression as it could add to the positive > buoyancy of a diver. He said the bottles had to be standard 10 ltr steel (or > larger if required) to be safe enough." > > Do IANTD really believe that ali bottles are dangerous in the ocean or is > someone trying to pull the wool over our eyes? > > Perhaps this IT trainer does not understand how buoyancy works. > > What is the official IANTD line on this and do you think this is sufficient > grounds for refusing to let someone train? > > Best, > John. > -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
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