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Re: [PSUBS-MAILIST] o2 control
A real psub design ! :-)) We (Emile and I ) make the same on
Sgt.Peppers. best regards Carsten
Cliff Redus schrieb:
>
> Carsten,
>
> I use both. If I loose my main battery bank (10 AGM Batteries,12 VDC, Deep
> cycle in series), the circuit will automatically switch over to a emergency
> 24V bank (2 AGM Batteries,12 VDC, Deep cycle in series) . If I loose both
> the main and emergency batteries, I have a flexible hose connection from the
> scrubber to use lung power to scrub CO2.
>
> Cliff
>
> > scrubber to a mouthpiece
> ----- Original Message -----
> From: "Carsten Standfuss" <Merlinsub@t-online.de>
> To: <personal_submersibles@psubs.org>
> Sent: Wednesday, December 21, 2005 2:06 PM
> Subject: Re: [PSUBS-MAILIST] o2 control
>
> > Hi Cliff, how do you run the scrubber in "black ship" condition ? By a
> > small 24V emergency battery or by a flexible hose conection from the
> > scrubber to a mouthpiece ? Or both ?
> >
> > best regards Carsten
> >
> >> Cliff Redus schrieb:
> >>
> >> In this thread on O2 control, I thought I would outline the system
> >> that I am using on my boat. I am about a year and a half into the
> >> fabrication of a one-man, one-atm. submersible rated to 300 ft. After
> >> much thought, and with the intent to stay within ABS rules, the
> >> following is what I ended up using. The normal mission time is 8
> >> hours with provisions for additional 72 hours of emergency life
> >> support. Components:
> >>
> >> 1 each Scuba first stage regulator (Aqualung Titan First Stage -
> >> Setup for 100% O2)
> >> 2 each Medical "E" size tank, 24 SCF, 2015 psig max
> >> 2 each Medical "D" size tank, 15 SCF, 2015 psig max
> >> 1 24VDC solenoid (O2 clean), NC, controlled by PLC
> >> 1 each Barometric pressure transducer, 0-5 VDC output , 700-1100 mbar
> >> 1 each Backup Oxygen Regulator 0-8 LPM H-Style gauge, John Bunn # 106
> >> JB0150-085
> >> 8 each Filter Cartridges, CO2 Scrubbing, "4-8". mesh Sofnolime, 4.5
> >> lbm/cartridge
> >> 1 each Flow-Control Needle Valve
> >> 1 24 VDC blower for circulation of cabin air through the
> >> filter system
> >> 1 each CO2 Sensor, 0-2000 ppm
> >> 1 each Maxtec MAx-250 O2 sensor element
> >>
> >> Normal operation:
> >>
> >> When the hatch is closed, the PLC records the barometric pressure in
> >> the hull. When the barometric pressures drop 10 mbar below the last
> >> hatch closure pressure, PLC signals solenoid valve to open in the
> >> regulated O2 supply. Four small external tanks for O2 are manifolded
> >> and located inside a FRP cowling to minimize drag. The first stage
> >> regulator is set to deliver 25 psi above ambient water pressure. When
> >> barometric pressure has been restored to the hatch closure pressure,
> >> the solenoid is closed. A needle valve down stream of the solenoid
> >> valve is adjusted so that a the surface, it takes 60 seconds to
> >> restore pressure to 1 atm. Cycle is repeated to maintain cabin
> >> pressure at 1 atm. The 100% O2 is introduced at the inlet to the
> >> scrubber. O2 and CO2 sensor measurements are displayed on a touch
> >> screen display and are for information only, not control. PLC will
> >> issue visual and audible alarms if O2 or CO2 levels go out of range.
> >>
> >> Emergency operation:
> >>
> >> In the event both the main power and backup power fail, the operator
> >> can manually adjust a medical oxygen regulator with a dial indicator
> >> from (0-8 lpm) . For one man, 0.5 lpm is nominal rate.
> >>
> >> All the elements of the life support system have been installed in the
> >> boat and leak tested. SS Swaglelok fittings were used for air and O2
> >> gas lines. A scuba first stage regulator was used for O2 so that in
> >> an emergency, I can blow MBT at depth with either air or O2 by opening
> >> a crossover solenoid valve between the air and O2 systems from the
> >> touch screen panel.
> >>
> >> In the next several weeks, I will be doing some life support tests in
> >> my shop so should be able to confirm how both the primary and backup
> >> systems work. If the automated system proves to be problematic, I
> >> will just use the backup system as the primary which is a fixed
> >> metered flow rate of O2 into cabin and monitor the O2 and CO2 levels.
> >>
> >> Cliff
> >>
> >
> >
> >
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