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right as rain... on all accounts... more below... On Fri, 28 Jun 1996, John E. McKenney wrote: > Scott Wrote > > >Going back a couple of years, I recall long conversations about >why the > >average diver shouldn't consider buying or using surplus military > >re-breathers (i.e. the Mk16 or Mk15.5) because the units had >been > designed > >for use by the military with no concern for servicability. I know it > >was said at least once that 'these units require excessive >amounts of > >pre-dive setup'. Statements like 'you need to almost re-build the >units > >after every dive' were made. > > >How much of this is still true with the CCR500, and how much of >it was > >hogwash from the start? > > >Thanks, > >Scott. > > Scott, > Vive been diving a Bio Marine CCR 155 for almost 2 years now. Yes there are > excessive amounts of maintenance both pre and post dive, with it. With out > a doubt it is going to be the same with the CCR 500. I know that Dick is > using the same technology and a lot of the same parts. I would not get > close to any unit that the manufacturer said "hey just slap this sucker on > and away you go see ya in four hours". Salt water, electronics, > pneumatics and the probability that human error will prevail, pretty much > eliminates the design of a maintenance free unit. Anyone out there who > discounts the hard fact, that there will be a lot of maintenance and > thereby sees himself not performing the necessary maintenance, DON'T BUY > ONE YOU WILL DIE. again, very true, and we don't want the bad press.. thanks. I don't believe what Dick said about only 15 minutes > worth of maintenance. > > You don't have to all most rebuild the unit after every dive. You had > better be able to take it all the way apart when it needs it in order to > keep it in good working order. The E package and Secondary gauges, unless > you are an EE might be tough to fix in the field. There's a check list > with about 20 things to do > Prior to and after a dive, see below. > > The words "log book" were made for this unit. Keeping track of everything > is a must. For those of you who enjoy technical maintenance it should be > enjoyable. After a while it's like anything else it becomes a habit. You > get good at it and it doesn't take as long as it did in the beginning. How > do you take care of your open circuit rig? A good question to ask yourself > before you buy a rebreather. > > If you let someone else do your maintenance for you you're a DICKHEAD, PACK > YOUR OWN CHUTE. > > When you want to change your set point, then calibration procedures have to > be done this takes 45 minutes to an hour. > > Replumbing a third tank into my unit was relatively easy about 2 or 3 days > in all. Some Swagelok, fittings and brackets, a three way valve, some > stainless tubing, a little plumbing experience will help. > > > Don't put any slobknobs on the unit or George will flame you. > > The expense doesn't stop with the purchase from Bio Marine. Are you going > to want a Haskel $4000.00. Are you going to want a computer $3000.00. > Sensors are 95.00 a piece life expectancy realistically 9 months > sometimes more sometimes less. You all ways need 1 or 2 spare in your kit. > > > I don't know what kind of bottles are going to be put on the CCR 500 I > haven't seen it. alum 15cf If they are the sphere's Nickel Cadnium. They aren't a DOT > item, therefore unless your dive shop owner/filler is a buddy, filling the > dilluent bottle with air could require a compressor. > > For those of you who are interested below is a copy of a check list and log > for pre-dive inspection on the CCR15.5. This does not include calabration > set up or scrubber changing or post dive maintenance. For those of you not > interested in this sorry for the waste of band width. > great check list, thanks much, can i use parts of it in my maintenance manual? really.. dp > > Heyydude will buy your old used scrubber and burnt out sensors from you. > > Hope this helps > > > JOHN MCKENNEY UNIT OWNER > PREDIVE CHECK LIST > CR155-UBA > > PROCEDURE DATE__________________ > > INSPECT FOR DIRT, DETERIORATION, AND DAMAGE DURING EACH PREDIVE STEP > > BOTTLE PRESSURE OXYGEN______DILUENT_______ _____________ > SCRUBBER , ACCUM., TIME ON SCRUBBER LOAD_________ _____________ > MOISTURE ABSORBERS _____________ > SENSOR WIRES _____________ > SENSOR READINGS IN AIR #1______ #2______ #3______ _____________ > CANISTER REINSTALLED _____________ > MOUTH PIECE & HOSES _____________ > BATTERY VOLTAGE -_______ +_______ > _____________ > INSTALL BATTERY, PRESSURE RING, BLEED SCREW _____________ > > DIVE CHECKLIST > INSTALL OXYGEN & DILUENT BOTTLES _____________ > OPEN DILUENT SHUTOFF VALVE. _____________***** > TEST DILUENT BYPASS VALVE _____________ > BOTTOM DIAPHRAGM TO TEST DILUENT ADD VALVE _____________ > TURN UNIT ON _____________ > OPEN OXYGEN SHUTOFF VALVE _____________***** > TEST OXYGEN BYPASS VALVE _____________ > WHEN SOLENOID STOPS, CHECK PRIMARY FOR "O" LIGHT _____________ > SECONDARY SENSOR READINGS #1______#2______#3______ _____________ > LEAK CHECK > TURN UNIT OFF UNTIL DIVE > > -- > Send mail for the `techdiver' mailing list to `techdiver@terra.net'. > Send subscription/archive requests to `techdiver-request@terra.net'. >
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