BOV and extra 2nd stage

Stephane · 17th September 2007, 17:37

Hello hello,

For those who have their BOV connected to an off-board bailout tank, do you also have an extra 2nd stage (to give to a buddy) or is the BOV the only way to breathe OC on the stage?

And last question: do you have a shut-off valve on the BOV gas line? Why?

Merci beaucoup.

Mark Chase · 17th September 2007, 17:46

Quote: (Originally Posted by Stephane)

Hello hello,

For those who have their BOV connected to an off-board bailout tank, do you also have an extra 2nd stage (to give to a buddy) or is the BOV the only way to breathe OC on the stage?

And last question: do you have a shut-off valve on the BOV gas line? Why?

Merci beaucoup.

Yes and yes

Bov could be full of nasty burning liquid

My buddy could need the gas

OC divers might need the gas

Shut off valve on BOV in case it free flows No fun loosing wing inflation + all your dill. A free flowing bov is not as easy to sort out as a free flowing second stage.

Someone recently died apparently attempting to bailout to a BOV that was isolated. This was put up as a reason not to have one. Sorry IMHO not checking your flow on the BOV it right up there with not switching the 02 on.

I check my BOV periodically during the dive regardless and immediately at the slightest hint of a thought that there just might be a reason to have to use it for real. I also practice finding and operating the isolator in the same way I did when i had one on the ADV of my Classic.

ATB

Mark

***diverklondike*** · 17th September 2007, 17:54

Quote: (Originally Posted by Mark Chase)

Yes and yes

Bov could be full of nasty burning liquid

My buddy could need the gas

OC divers might need the gas

Shut off valve on BOV in case it free flows No fun loosing wing inflation + all your dill. A free flowing bov is not as easy to sort out as a free flowing second stage.

Someone recently died apparently attempting to bailout to a BOV that was isolated. This was put up as a reason not to have one. Sorry IMHO not checking your flow on the BOV it right up there with not switching the 02 on.

I check my BOV periodically during the dive regardless and immediately at the slightest hint of a thought that there just might be a reason to have to use it for real. I also practice finding and operating the isolator in the same way I did when i had one on the ADV of my Classic.

ATB

Mark

"Ditto" on all of Mark's comments...

M

Dave Sutton · 17th September 2007, 18:57

Yes please... ditto above.

Dave

Stephane · 17th September 2007, 18:59

Well, I guess I'll have to buy a shut-off valve and leave the 2nd stage on the rebulator.

Thank you all for your comments, have some green.

MarcLaukien · 17th September 2007, 20:14

Instead of a shut-off valve, I have a quick disconnect on my BOV. In case of a free flow, I disconnect the BOV.

Stephane · 17th September 2007, 20:22

As the BOV will be fed from an off-board tank, I sure will have a quick-connect system (probably a Swagelok QC6) but I find the shut-off valve more convenient to manipulate, especially if it's located near the BOV.
But, this is what I think now that I'm behind a keyboard. I will maybe change my mind ...

brinoz · 17th September 2007, 20:59

Hi

A shut-off valve is needed only if you use also your bail out tank for wings and/or dil (to feed something else in general).

I do not have a BOV yet but I am thinking of the following config :
- inboard dill + wing inflation
- dedicated small bottle for suit inflation
- BOV + second stage on bail out tank, nothing else. In case of freeflowing, I will shut off the cylinder valve

Regards
Bruno

Hanssing · 17th September 2007, 21:19

Quote: (Originally Posted by brinoz)

I do not have a BOV yet but I am thinking of the following config :
- inboard dill + wing inflation
- dedicated small bottle for suit inflation
- BOV + second stage on bail out tank, nothing else. In case of freeflowing, I will shut off the cylinder valve

Well guys,
Seeing this is getting near a rEvo thread here's my dream-setup for the rEvo, which I am still diving in stock config:

O2-Side:
Standard Wing-inflation with replaced Highflow QC (Golem or CEJN)
T-piece on 1st-stage for hose and OPV.
(... or perhaps a breating inflator jury is still out on that one, but I'm leaning towards the normal inflator, so no freeflow or reg-mixup can occur)

Dil-side:
Original Hose from 1st.stage to internal feed is maintained.
One hose runs from 1st. stage to a 1->3 port manifold at scrubbercage
Port A: BOV with highflow QC at the BOV.
Port B: Drysuit (If EAN-diving)
Port C: Offboard QC

Very few hoses, very simple, but provides BOV-acess to all gas offboard as well as inboard. This is done, since I do a Lot of diving real shallow, and on these <12m dives I wont bring Offboard. The setup give reduandant boyancy, but the wing only gets inflated at surface, or if I have a drysuit-leak, so not much O2 is wasted, and I dont have to bring special bottles for drysuit.
Also I was "lucky" enough to recieve the 300bars 3l. cylinders, and my booster likes them

As to the original question, I will bring a spare regulator on any offboard gas.
And I will have a QC at bov for more than one reason:
* Provides access to O2, even if Dilside has gone BOOM.
* Can shut down freeflow of BOV
* Can be detached when cleaning breating hoses and drying.

As allways heavily inspired by Dave Sutton - thanks Dave.

Nicolai

Dave Sutton · 17th September 2007, 22:19

Trust me.... you won't mistake your 02-fed inflator/regulator for a bottom-gas regulator..... and they don't freeflow, and if they do, you can disconnect it using the QD. Just get one (I use the Apeks/Zeagle ones).

It'll be a good setup. When you get closer we'll draw out the system including the checkvalves that will make it all come out well. The offboard *inlet* to your 3 port manifold needs to have a checkvalve installed, or have double-shutoff QD's. If you stick to CEJN's (recommended) you'll use the stub on the inlet feed to the manifold and will need that to feed thru a non-return valve. You want one with a fairly high cracking pressure so it does not take in water *ever*, while still having a good flow coefficient so you can breathe thru it.

Actually, I have a spare offboard manifold and hose setup all made and ready to install on a rEvo... just on a *guess* that someone in Denmark might want the *correct* hardware...... wonder if anyone wants it complete, ready to plug and play?

. And if you want to do without the 02 regulator, the offboard gas can just as easially be offboard 02 as diluent... as long as you have CEJN feed hoses on your donor gas bottles.

Log your 50 hours and then we'll talk again.

Dave

17th September 2007, 17:37	#1 (permalink)
Stephane Hey! Ho! Let's go! Current Rebreather/s: rEvo Other Rebreather/s: rEvo Join Date: Nov 2005 Location: Nantes - France Posts: 742	BOV and extra 2nd stage Hello hello, For those who have their BOV connected to an off-board bailout tank, do you also have an extra 2nd stage (to give to a buddy) or is the BOV the only way to breathe OC on the stage? And last question: do you have a shut-off valve on the BOV gas line? Why? Merci beaucoup. __________________ Stéphane Hammer-rEvo powered!
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17th September 2007, 17:46	#2 (permalink)
Mark Chase I go down for ages Current Rebreather/s: Classic Kiss Other Rebreather/s: Inspiration Classic Join Date: Jan 2005 Location: Kent Posts: 2,564	Re: BOV and extra 2nd stage Quote: (Originally Posted by Stephane) Hello hello, For those who have their BOV connected to an off-board bailout tank, do you also have an extra 2nd stage (to give to a buddy) or is the BOV the only way to breathe OC on the stage? And last question: do you have a shut-off valve on the BOV gas line? Why? Merci beaucoup. Yes and yes Bov could be full of nasty burning liquid My buddy could need the gas OC divers might need the gas Shut off valve on BOV in case it free flows No fun loosing wing inflation + all your dill. A free flowing bov is not as easy to sort out as a free flowing second stage. Someone recently died apparently attempting to bailout to a BOV that was isolated. This was put up as a reason not to have one. Sorry IMHO not checking your flow on the BOV it right up there with not switching the 02 on. I check my BOV periodically during the dive regardless and immediately at the slightest hint of a thought that there just might be a reason to have to use it for real. I also practice finding and operating the isolator in the same way I did when i had one on the ADV of my Classic. ATB Mark __________________ Is it supposed to make that noise ? I took my unit to the dive shop and demanded they bolt on every thing that would fit. Join my elite diving teem and get a Tshirt "Doing It Chasey"Hammerhead Eccr Advanced Diving System
(Online)

17th September 2007, 17:54	#3 (permalink)
*diverklondike* Moderator Current Rebreather/s: Inspiration Classic Other CCR Other Rebreather/s: Inspiration Classic Other CCR Join Date: Oct 2005 Location: Delaware, USA Posts: 1,563	Re: BOV and extra 2nd stage Quote: (Originally Posted by Mark Chase) Yes and yes Bov could be full of nasty burning liquid My buddy could need the gas OC divers might need the gas Shut off valve on BOV in case it free flows No fun loosing wing inflation + all your dill. A free flowing bov is not as easy to sort out as a free flowing second stage. Someone recently died apparently attempting to bailout to a BOV that was isolated. This was put up as a reason not to have one. Sorry IMHO not checking your flow on the BOV it right up there with not switching the 02 on. I check my BOV periodically during the dive regardless and immediately at the slightest hint of a thought that there just might be a reason to have to use it for real. I also practice finding and operating the isolator in the same way I did when i had one on the ADV of my Classic. ATB Mark "Ditto" on all of Mark's comments... M
(Online)

17th September 2007, 18:57	#4 (permalink)
Dave Sutton Membership Cancelled Current Rebreather/s: Sport Kiss MK 15.X rEvo Other CCR Azimuth Home Build Other Rebreather/s: Classic Kiss rEvo Other CCR Azimuth Home Build Join Date: Jun 2006 Location: Narragansett, Rhode Island and Hackettstown, New Jersey Posts: 2,637	Re: BOV and extra 2nd stage Yes please... ditto above. Dave
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17th September 2007, 18:59	#5 (permalink)
Stephane Hey! Ho! Let's go! Current Rebreather/s: rEvo Other Rebreather/s: rEvo Join Date: Nov 2005 Location: Nantes - France Posts: 742	Re: BOV and extra 2nd stage Well, I guess I'll have to buy a shut-off valve and leave the 2nd stage on the rebulator. Thank you all for your comments, have some green. __________________ Stéphane Hammer-rEvo powered!
(Offline)

17th September 2007, 20:14	#6 (permalink)
MarcLaukien Custom Title Allowed! Current Rebreather/s: Other CCR Other Rebreather/s: Optima Other CCR Join Date: Dec 2006 Location: South East Florida Posts: 181	Re: BOV and extra 2nd stage Instead of a shut-off valve, I have a quick disconnect on my BOV. In case of a free flow, I disconnect the BOV.
(Offline)

17th September 2007, 20:22	#7 (permalink)
Stephane Hey! Ho! Let's go! Current Rebreather/s: rEvo Other Rebreather/s: rEvo Join Date: Nov 2005 Location: Nantes - France Posts: 742	Re: BOV and extra 2nd stage As the BOV will be fed from an off-board tank, I sure will have a quick-connect system (probably a Swagelok QC6) but I find the shut-off valve more convenient to manipulate, especially if it's located near the BOV. But, this is what I think now that I'm behind a keyboard. I will maybe change my mind ... __________________ Stéphane Hammer-rEvo powered!
(Offline)

17th September 2007, 20:59	#8 (permalink)
brinoz New Member Current Rebreather/s: rEvo Other Rebreather/s: rEvo Join Date: Sep 2006 Location: Belgium Posts: 51	Re: BOV and extra 2nd stage Hi A shut-off valve is needed only if you use also your bail out tank for wings and/or dil (to feed something else in general). I do not have a BOV yet but I am thinking of the following config : - inboard dill + wing inflation - dedicated small bottle for suit inflation - BOV + second stage on bail out tank, nothing else. In case of freeflowing, I will shut off the cylinder valve Regards Bruno
(Offline)

17th September 2007, 21:19	#9 (permalink)
Hanssing flap-flop ..... flap-flop Current Rebreather/s: rEvo Other Rebreather/s: rEvo Join Date: Nov 2005 Location: Denmark Posts: 378	Re: BOV and extra 2nd stage Quote: (Originally Posted by brinoz) I do not have a BOV yet but I am thinking of the following config : - inboard dill + wing inflation - dedicated small bottle for suit inflation - BOV + second stage on bail out tank, nothing else. In case of freeflowing, I will shut off the cylinder valve Well guys, Seeing this is getting near a rEvo thread here's my dream-setup for the rEvo, which I am still diving in stock config: O2-Side: Standard Wing-inflation with replaced Highflow QC (Golem or CEJN) T-piece on 1st-stage for hose and OPV. (... or perhaps a breating inflator jury is still out on that one, but I'm leaning towards the normal inflator, so no freeflow or reg-mixup can occur) Dil-side: Original Hose from 1st.stage to internal feed is maintained. One hose runs from 1st. stage to a 1->3 port manifold at scrubbercage Port A: BOV with highflow QC at the BOV. Port B: Drysuit (If EAN-diving) Port C: Offboard QC Very few hoses, very simple, but provides BOV-acess to all gas offboard as well as inboard. This is done, since I do a Lot of diving real shallow, and on these <12m dives I wont bring Offboard. The setup give reduandant boyancy, but the wing only gets inflated at surface, or if I have a drysuit-leak, so not much O2 is wasted, and I dont have to bring special bottles for drysuit. Also I was "lucky" enough to recieve the 300bars 3l. cylinders, and my booster likes them As to the original question, I will bring a spare regulator on any offboard gas. And I will have a QC at bov for more than one reason: * Provides access to O2, even if Dilside has gone BOOM. * Can shut down freeflow of BOV * Can be detached when cleaning breating hoses and drying. As allways heavily inspired by Dave Sutton - thanks Dave. Nicolai __________________ Woohooo - I can change my rEvo! Its going to be bitchin' tricked out piece of gear
(Online)

17th September 2007, 22:19	#10 (permalink)
Dave Sutton Membership Cancelled Current Rebreather/s: Sport Kiss MK 15.X rEvo Other CCR Azimuth Home Build Other Rebreather/s: Classic Kiss rEvo Other CCR Azimuth Home Build Join Date: Jun 2006 Location: Narragansett, Rhode Island and Hackettstown, New Jersey Posts: 2,637	Re: BOV and extra 2nd stage Trust me.... you won't mistake your 02-fed inflator/regulator for a bottom-gas regulator..... and they don't freeflow, and if they do, you can disconnect it using the QD. Just get one (I use the Apeks/Zeagle ones). It'll be a good setup. When you get closer we'll draw out the system including the checkvalves that will make it all come out well. The offboard inlet to your 3 port manifold needs to have a checkvalve installed, or have double-shutoff QD's. If you stick to CEJN's (recommended) you'll use the stub on the inlet feed to the manifold and will need that to feed thru a non-return valve. You want one with a fairly high cracking pressure so it does not take in water ever, while still having a good flow coefficient so you can breathe thru it. Actually, I have a spare offboard manifold and hose setup all made and ready to install on a rEvo... just on a guess that someone in Denmark might want the correct hardware...... wonder if anyone wants it complete, ready to plug and play? . And if you want to do without the 02 regulator, the offboard gas can just as easially be offboard 02 as diluent... as long as you have CEJN feed hoses on your donor gas bottles. Log your 50 hours and then we'll talk again. Dave
(Offline)

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