ip recomendations...

netmage

Using DS4's w/ defualt ip of 135psi... chatting around breakfast w/ Fergus since we got blown out in NC today, mentioned he turned his ip down to 90 to reduce wear tear on seats and solenoid power consumption... Wondering if there was any recommendation IP for O2/Dil 1st's...?

-Tim

PacketSniffer

What testing did he do to show the power consumption is reduced???

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Far better it is to dare mighty things, to win glorious triumphs, even though checked by failure, than to take rank with those poor spirits who neither enjoy much nor suffer much, because they live in the gray twilight that knows not victory or defeat.

netmage

He's on an optima, so I'm not sure its apples/apples... the logic is that there is less force laterally against the solenoid - I think...

I'm not on a copis rig, so depth compensation is still in play, really just curious i theres any benefit tuning from stock Apeks specs

PacketSniffer

Yeh, but the solenoid requires a specific amount of power to operate the plunger. If you have not pressurized the regs and hoses, does the solenoid require no power to operate?

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Far better it is to dare mighty things, to win glorious triumphs, even though checked by failure, than to take rank with those poor spirits who neither enjoy much nor suffer much, because they live in the gray twilight that knows not victory or defeat.

netmage

No... of course not silly...

But if anyone were trying to squeeze blood from a turnip - it'd be you....

diverreb

Manufactures recommend specific ip's for a reason.... Usually optimum performance regarding set point maintenance and not over stressing various parts in the system, and to get optimum power consumption, which will vary with different ip settings due to more or fewer solenoid firings to maintain a set point.

Richie

jradomski

The optima solenoid NEEDS to be in the neighborhood of 90 psi as the max operating pressure rating is not much higher than this..

All solenoids have a minimum power draw when there is no pressure applied and a max power draw at their recommended operating conditions... Different pressures will have varying effects on the specific solenoid..

take the snaptite solenoid, there a small difference between 100 psi and 150psi, so in this range its not worth the power savings to reduce the ip, keep it in the 135 to 150 psi range.. in fact your power consumption on something like the HH will go UP.. Why.. lets say the HH has some power saving tricks in the solenoid control, a lower IP will actually cause it to fire more often and therefore use more overall power.. Many Solenoids in take more power to activate than to hold open..

if you take something like the jaska solenoid on the meg, the orifice is smaller than used on the optima and snaptite solenoids, an IP of 90 psi will result in a VERY small flow and wount be really good on ascents (and depending on the software version and work load also on a constant depth) and will require manual adding of o2.. I would operate the jaska atleast 140psi.. Hiigher is even better..

do the math on the various orifice sizes.. CE mandates the ability to deliever at least 12lpm to cover ascents.. when you take into account the available duty cycles of the various rebreathers, it means in many cases you need a flow in the range of 25-30lpm..

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Joe Radomski
CCR Trimix Instructor Trainer
ANDI Instructor Trainer Director #10

All posts are personal opinions and DO NOT reflect any affiliated agency unless specifically stated.

netmage

Thnks Joe...

gtzavelas

and what would be the max you would reccommend?

jradomski

I don't know the exact specs on the solenoid, but looking at their website on similiar solenoids 150 psi should be a safe setting..

__________________
Joe Radomski
CCR Trimix Instructor Trainer
ANDI Instructor Trainer Director #10

All posts are personal opinions and DO NOT reflect any affiliated agency unless specifically stated.