So How do you connect your BOV up

***schford*** · 10th March 2007, 18:15

I am still kicking around the idea of a BOV - personally I believe that Open Loop is the first step but then I can see the benefit of flicking a switch rather than removing your DSV.

With that in mind - how do you guys who have them set them up. Is it a quick disconnect to your deep bailout?

Then when you move from that to shallower gas you put a reg in or do you have some sort of switching block or quick disconnects?

Thanks

Stuart

**Dave Sutton** · 10th March 2007, 21:11

Two manifolds on the left (diluent) side of the rig:

(1): Connected to the internal diluent supply to allow it's external distribution (think drysuit, wings, BOV, etc)

(2): Connected to the offboard diluent selector valve inside the rig, and with a port (in) and a port (out) external to the rig. Think "this is where offboard gas it plugged to the rig for distribution".

Manifold (1): feeds drysuit and and can feed BOV if diving "naked" (IE no external gas). I use air in my onboard bottle all the time so in less than perhaps 150 feet of water this is it. (actually when I switch to gas, I also switch internal diluent to 50/50 nitrox so it's a better deco gas both SCC and OC....another "Alpinist Survival Strategy topic for another day).

Manifold (2): Accepts offboard gas IN thru a quick disconnect hose at my left shoulder (Swagelok QC-6) and distributes that gas thru the side of the rig to the ofboard gas select valve, and may also act to feed that gas to the BOV as well. This way the offboard gas cylinder is connected to the rig with only one QD hose, and the distribution to the rig and the BOV is done at the rig, not by feeding each thig with a separate QD.

Modularity is the key.

Manifolds are machined brass with 3/8-24 UNF ports (normal first stage threads). Makes it dead-simple.
Photos later, rig is all torn apart right now for winter maintenance.

To beat a dead horse, if you use normoxic diluents when possible (down to perhaps 220 feet or so) you can have your bottom diluent to the BOV all the time. Just another reason to avoid the inapproproate use of hypoxic diluents when not required. I want my BOV to be a good gas *everywhere*, surface included, without needing to worry about it.

Dave

Gilles · 10th March 2007, 23:16

Quote: (Originally Posted by Dave Sutton)

Photos later, rig is all torn apart right now for winter maintenance.

Dave

More green

awaits the delivery of those photos.

divetheworld · 10th March 2007, 23:24

Using a gas switching block I have connected the diluent and oxygen to the input and the output goes to the open circuit regulator. When using open circuit the gas, diluent can feed the regulator until the 6m stop is reached. At this point the switching block is changed over to feed pure oxygen to maximise off-gassing of your out of gas buddy. On my unit, I am using a Drager Ray manifold to also feed the BOV.
The BOV is fed by a GCS connector. This can be connected into any of the offline gases.

Mark Chase · 10th March 2007, 23:44

Here the BOV is conected to the inboard 3ltr Id run it like this If i was doing a 10m dive under Brighton Pier

Here i have disconected the inboard and I have conected off board 7ltr gas. i tuck the 3ltr fitting away so It dosent get lost incase i need it.

On this one you can see the route of the hose and the fact i also have an OC bailout reg on the tank

Should i need to hand off the stage i can reconect the 3ltr so i still have a sanity breath for my self in the event I need to bailout later as well.

It seems to work OK and not look too much of a hose fest.

ATB

Mark Chase

diverklondike · 11th March 2007, 01:04

Quote: (Originally Posted by Dave Sutton)

Two manifolds on the left (diluent) side of the rig:

(1): Connected to the internal diluent supply to allow it's external distribution (think drysuit, wings, BOV, etc)

(2): Connected to the offboard diluent selector valve inside the rig, and with a port (in) and a port (out) external to the rig. Think "this is where offboard gas it plugged to the rig for distribution".

Manifold (1): feeds drysuit and and can feed BOV if diving "naked" (IE no external gas). I use air in my onboard bottle all the time so in less than perhaps 150 feet of water this is it. (actually when I switch to gas, I also switch internal diluent to 50/50 nitrox so it's a better deco gas both SCC and OC....another "Alpinist Survival Strategy topic for another day).

Manifold (2): Accepts offboard gas IN thru a quick disconnect hose at my left shoulder (Swagelok QC-6) and distributes that gas thru the side of the rig to the ofboard gas select valve, and may also act to feed that gas to the BOV as well. This way the offboard gas cylinder is connected to the rig with only one QD hose, and the distribution to the rig and the BOV is done at the rig, not by feeding each thig with a separate QD.

Modularity is the key.

Manifolds are machined brass with 3/8-24 UNF ports (normal first stage threads). Makes it dead-simple.
Photos later, rig is all torn apart right now for winter maintenance.

To beat a dead horse, if you use normoxic diluents when possible (down to perhaps 220 feet or so) you can have your bottom diluent to the BOV all the time. Just another reason to avoid the inapproproate use of hypoxic diluents when not required. I want my BOV to be a good gas *everywhere*, surface included, without needing to worry about it.

Dave

Stuart,

My Golem BOV article has some examples and pics...

http://www.rebreatherworld.com/inspi...spiration.html

It could be easily adapted to the Meg.

Dave...

Just my 2 cents here but I would never want my Wing and Dry suit on the same gas source... I also would not have my dry suite run off my back gas since I use more dry suit gas than wing gas...

Sorry for going off topic....

Mark

**Dave Sutton** · 11th March 2007, 01:10

Quote: (Originally Posted by diverklondike)

Dave... Just my 2 cents here but I would never want my Wing and Dry suit on the same gas source... I also would not have my dry suite run off my back gas since I use more dry suit gas than wing gas... Mark

I never wear both, only one or the other...... you know I wear as little equipment as possible: I just don't see the value of wings with a rebreather. I'm not trimming out 20 pounds of open circuit gas that I'm going to blow on a dive. Suit is almost empty at neutral bouyancy. I've got almost 30 cubes in my onboard sphere so suit inflate seems OK there. When diving mix I'm not using that gas for anything else anyhow. All mix is carried offboard. In any case, I can plug my wings (if worn) into either the offboard or inboard diluent manifiolds on the left side of my rig to do anything I need, no worries.

The photos show my external manifolds. On the right side of the rig is an 02 manifold with (4) ports on it. The main internal 02 line feeds the back of it, and taken OUT of the back of it is the line that then routes the 02 to the internal rig 02 system. As far as internal 02 the manifold acts as a continuation of the main 02 from the first stage to the rig. On the exterior of the manifold there are 4 ports from which I can feed an open circuit 02 regulator if I need to, or can feed into the rig external 02 if needed. Works great.

The diluent side is a mirror image of the 02 side: Into the back of the manifold GOES the 02 from the internal regulator and COMES a SS line feeding the rig's internal diluent selector whitey valve. On the outside of the rig is the same thing that I have on the 02 side, 4 ports FROM which can be tapped BOV gas, drysuit gas, etc, or which can be FED with gas if needed. Whatever is there is fed to the rig as long as the external diluent supply valve (3 way valve on the bottom of the rig) is set to "internal".

The black manifold right next to the chrome one on the diluent side is the OFFBOARD manifold, INTO which is normally fed offboard gas suplied to the rig, the backside of the manifold feeds the other side of the 3-way diluent selector valve which if set to "offboard" puts this gas to the rigs ADV, etc. This manifold also has (2) EXTERNAL ports that vare spares, so that offboard gas can be fed to wings, BOV, etc.

The close placement of the two diluent manifolds means that my BOV supply hose can go into one or the other, based on if I want to feed it with on-board or off-board gas as it's default.

My BOV has a Golem Gear QD at the inlet to the regulator, which is the same fitting as I use in my drysuit and wings. The bottom line is that I can plug ANYTHING into ANYTHING and feed (wings if worn, drysuit, and BOV) from (02 internal, 02 external, diluent internal, diluent external) just by plug and play.

The overall photo shows how the stainless steel lins from the stages feed the BACK of the manifolds. What cannot be seen well is the internal SS tubing that feeds that gas back into the rig from the rear of the two manifolds, and which takes the offboard gas supply back to the 3 way valve.

Mark, you run the offboard gas line across your waist to the QD on the right side? Offboard gas carried on your left side?

Dave

Drmike · 11th March 2007, 03:04

Quote: (Originally Posted by Dave Sutton)

Two manifolds on the left (diluent) side of the rig:

(1): Connected to the internal diluent supply to allow it's external distribution (think drysuit, wings, BOV, etc)

(2): Connected to the offboard diluent selector valve inside the rig, and with a port (in) and a port (out) external to the rig. Think "this is where offboard gas it plugged to the rig for distribution".

Manifold (1): feeds drysuit and and can feed BOV if diving "naked" (IE no external gas). I use air in my onboard bottle all the time so in less than perhaps 150 feet of water this is it. (actually when I switch to gas, I also switch internal diluent to 50/50 nitrox so it's a better deco gas both SCC and OC....another "Alpinist Survival Strategy topic for another day).

Manifold (2): Accepts offboard gas IN thru a quick disconnect hose at my left shoulder (Swagelok QC-6) and distributes that gas thru the side of the rig to the ofboard gas select valve, and may also act to feed that gas to the BOV as well. This way the offboard gas cylinder is connected to the rig with only one QD hose, and the distribution to the rig and the BOV is done at the rig, not by feeding each thig with a separate QD.

Modularity is the key.

Manifolds are machined brass with 3/8-24 UNF ports (normal first stage threads). Makes it dead-simple.
Photos later, rig is all torn apart right now for winter maintenance.

To beat a dead horse, if you use normoxic diluents when possible (down to perhaps 220 feet or so) you can have your bottom diluent to the BOV all the time. Just another reason to avoid the inapproproate use of hypoxic diluents when not required. I want my BOV to be a good gas *everywhere*, surface included, without needing to worry about it.

Dave

My set up has evolved over time and will probably change again. For now it looks like this. Get hold of some drills, taps and some brass bar - very useful to be able to knock out custom manifolds. Mine feeds my back mounted BOB-ADV and my BOV too.

Like dave I keep offboard gas that powers the BOV as normoxic as I can (but that is not always possible)

See attached pic:

**Dave Sutton** · 11th March 2007, 03:28

Quote: (Originally Posted by Drmike)

My set up has evolved over time and will probably change again. Get hold of some drills, taps and some brass bar - very useful to be able to knock out custom manifolds. Mine feeds mt BOB and BOV too See attached pic:

Wow...

Mike's manifold feed-diagram is *exactly* like mine... just imagine the "2 port side" fed thru into the interior and the "3 port side" being external to the rig.

Brass works great. I've also had very good luck making up Delrin manifolds. Easier to work with.

The trick here when making manifolds is to buy the CORRECT cutter to port the hole for the O-ring of the hose. Otherwise it's trial and error to cut the port to dimension. Photo of the cutter and the resultant port attached.

Needed for making manifolds:

Drill: Letter Drill "Q"

Tap: 3/8-24 UNF

Reamer: For O-Ring port....

And you're in business.

Often it's also nice to use 1/8 National Pipe threads... "almost" but not quite the same as a standard regulator thread, but no O-Ring to worry about.

I probably ought to confess that the lower of the ports on both diluent and 02 sides feed QD hoses that fit the drysuit valves used as gas add valves on my BOB....

Dave

Drmike · 11th March 2007, 03:49

Quote: (Originally Posted by Dave Sutton)

The trick here when making manifolds is to buy the CORRECT cutter to port the hole for the O-ring of the hose. Otherwise it's trial and error to cut the port to dimension. Photo of the cutter and the resultant port attached.

ha ha yeh tell me about it

counter-boring with a larger drill works - but theres a few 'prototypes' laying around my workshop lol!

10th March 2007, 18:15	#1 (permalink)
*schford* RBW Founder Current Rebreather/s: Megalodon Sport Kiss Other Rebreather/s: Join Date: Jan 2005 Location: UK Posts: 3,564	So How do you connect your BOV up I am still kicking around the idea of a BOV - personally I believe that Open Loop is the first step but then I can see the benefit of flicking a switch rather than removing your DSV. With that in mind - how do you guys who have them set them up. Is it a quick disconnect to your deep bailout? Then when you move from that to shallower gas you put a reg in or do you have some sort of switching block or quick disconnects? Thanks Stuart __________________ Bailout and Kit Management account for Murphy's Law The only bad question is one you did not ask and later wish you had. Use of RBW is subject to the Rebreather World Terms & Conditions of Use
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10th March 2007, 21:11	#2 (permalink)
Dave Sutton Diveshop of Horrors Current Rebreather/s: Sport Kiss MK 15.X rEvo Other CCR Azimuth Home Build Other Rebreather/s: Evolution Megalodon rEvo Other CCR Azimuth Home Build Join Date: Jun 2006 Location: Narragansett, Rhode Island and Hackettstown, New Jersey Posts: 2,971	Re: So How do you connect your BOV up Two manifolds on the left (diluent) side of the rig: (1): Connected to the internal diluent supply to allow it's external distribution (think drysuit, wings, BOV, etc) (2): Connected to the offboard diluent selector valve inside the rig, and with a port (in) and a port (out) external to the rig. Think "this is where offboard gas it plugged to the rig for distribution". Manifold (1): feeds drysuit and and can feed BOV if diving "naked" (IE no external gas). I use air in my onboard bottle all the time so in less than perhaps 150 feet of water this is it. (actually when I switch to gas, I also switch internal diluent to 50/50 nitrox so it's a better deco gas both SCC and OC....another "Alpinist Survival Strategy topic for another day). Manifold (2): Accepts offboard gas IN thru a quick disconnect hose at my left shoulder (Swagelok QC-6) and distributes that gas thru the side of the rig to the ofboard gas select valve, and may also act to feed that gas to the BOV as well. This way the offboard gas cylinder is connected to the rig with only one QD hose, and the distribution to the rig and the BOV is done at the rig, not by feeding each thig with a separate QD. Modularity is the key. Manifolds are machined brass with 3/8-24 UNF ports (normal first stage threads). Makes it dead-simple. Photos later, rig is all torn apart right now for winter maintenance. To beat a dead horse, if you use normoxic diluents when possible (down to perhaps 220 feet or so) you can have your bottom diluent to the BOV all the time. Just another reason to avoid the inapproproate use of hypoxic diluents when not required. I want my BOV to be a good gas everywhere, surface included, without needing to worry about it. Dave __________________ "Silent Diving with No Bubbles and No Politics".... www.nobubblediving.com And the colors of the sea blind your eyes with trembling mermaids, For the sparkling waves are calling you to kiss their white-laced lips. And you see a girls brown body dancing through the turquoise, And her footprints make you follow where the sky loves the sea. And when your fingers find her, she drowns you in her body, Carving deep blue ripples in the tissues of your mind...... Last edited by Dave Sutton : 10th March 2007 at 21:18.
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10th March 2007, 23:16	#3 (permalink)
Gilles Worship the feminine Current Rebreather/s: Megalodon Other Rebreather/s: Join Date: Sep 2005 Location: Den Haag (Netherlands) Posts: 762	Re: So How do you connect your BOV up Quote: (Originally Posted by Dave Sutton) Photos later, rig is all torn apart right now for winter maintenance. Dave More green awaits the delivery of those photos. __________________ Gilles http://www.dirrebreather.com
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10th March 2007, 23:24	#4 (permalink)
divetheworld Dive porn pimp Current Rebreather/s: Inspiration Classic Other CCR Other Rebreather/s: Not Bought Yet Inspiration Classic Inspiration Vision Classic Kiss Other CCR Join Date: Mar 2005 Location: Leeds, England Posts: 1,661	Re: So How do you connect your BOV up Using a gas switching block I have connected the diluent and oxygen to the input and the output goes to the open circuit regulator. When using open circuit the gas, diluent can feed the regulator until the 6m stop is reached. At this point the switching block is changed over to feed pure oxygen to maximise off-gassing of your out of gas buddy. On my unit, I am using a Drager Ray manifold to also feed the BOV. The BOV is fed by a GCS connector. This can be connected into any of the offline gases. __________________ Attitude and self praise is no reccomendation. Dont try to be a great man, just be a man and let history be the judge of you. *WWW.NARKEDAT90.CO.UK* *http://www.grpservices.com/pursuit/* Supporting Shearwater Research Products in Europe
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10th March 2007, 23:44	#5 (permalink)
Mark Chase RBW Member Current Rebreather/s: Classic Kiss Other Rebreather/s: Inspiration Classic Join Date: Jan 2005 Location: Kent Posts: 2,904	Re: So How do you connect your BOV up Here the BOV is conected to the inboard 3ltr Id run it like this If i was doing a 10m dive under Brighton Pier Here i have disconected the inboard and I have conected off board 7ltr gas. i tuck the 3ltr fitting away so It dosent get lost incase i need it. On this one you can see the route of the hose and the fact i also have an OC bailout reg on the tank Should i need to hand off the stage i can reconect the 3ltr so i still have a sanity breath for my self in the event I need to bailout later as well. It seems to work OK and not look too much of a hose fest. ATB Mark Chase __________________ See my "Doing It Chasey" video where I'm locked into a padded room, naked, with two ball bearings and within an Hour, I manage to lose one and break the other!!! Kevin Juergensen 16/11/08 [/quote]
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11th March 2007, 01:04	#6 (permalink)
diverklondike RBW Member Current Rebreather/s: Inspiration Classic Other CCR Other Rebreather/s: Inspiration Classic Other CCR Join Date: Oct 2005 Location: Delaware, USA Posts: 1,780	Re: So How do you connect your BOV up Quote: (Originally Posted by Dave Sutton) Two manifolds on the left (diluent) side of the rig: (1): Connected to the internal diluent supply to allow it's external distribution (think drysuit, wings, BOV, etc) (2): Connected to the offboard diluent selector valve inside the rig, and with a port (in) and a port (out) external to the rig. Think "this is where offboard gas it plugged to the rig for distribution". Manifold (1): feeds drysuit and and can feed BOV if diving "naked" (IE no external gas). I use air in my onboard bottle all the time so in less than perhaps 150 feet of water this is it. (actually when I switch to gas, I also switch internal diluent to 50/50 nitrox so it's a better deco gas both SCC and OC....another "Alpinist Survival Strategy topic for another day). Manifold (2): Accepts offboard gas IN thru a quick disconnect hose at my left shoulder (Swagelok QC-6) and distributes that gas thru the side of the rig to the ofboard gas select valve, and may also act to feed that gas to the BOV as well. This way the offboard gas cylinder is connected to the rig with only one QD hose, and the distribution to the rig and the BOV is done at the rig, not by feeding each thig with a separate QD. Modularity is the key. Manifolds are machined brass with 3/8-24 UNF ports (normal first stage threads). Makes it dead-simple. Photos later, rig is all torn apart right now for winter maintenance. To beat a dead horse, if you use normoxic diluents when possible (down to perhaps 220 feet or so) you can have your bottom diluent to the BOV all the time. Just another reason to avoid the inapproproate use of hypoxic diluents when not required. I want my BOV to be a good gas everywhere, surface included, without needing to worry about it. Dave Stuart, My Golem BOV article has some examples and pics... http://www.rebreatherworld.com/inspi...spiration.html It could be easily adapted to the Meg. Dave... Just my 2 cents here but I would never want my Wing and Dry suit on the same gas source... I also would not have my dry suite run off my back gas since I use more dry suit gas than wing gas... Sorry for going off topic.... Mark
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11th March 2007, 03:49	#10 (permalink)
Drmike RBW Member Current Rebreather/s: MK 15.X Ouroboros Other CCR Home Build Other Rebreather/s: Inspiration Classic Other CCR Home Build Join Date: Feb 2005 Posts: 3,379	Re: So How do you connect your BOV up Quote: (Originally Posted by Dave Sutton) The trick here when making manifolds is to buy the CORRECT cutter to port the hole for the O-ring of the hose. Otherwise it's trial and error to cut the port to dimension. Photo of the cutter and the resultant port attached. ha ha yeh tell me about it counter-boring with a larger drill works - but theres a few 'prototypes' laying around my workshop lol! __________________ Cave diving is a sport Wreck diving is a sport Diving in general is a sport 'Rebreather diving' is not a sport its the delusional obsession with a highly dangerous and often inappropriate piece of equipment
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