jetsam baby booster freezing

**wedivebc** · 5th April 2008, 17:22

Depening on the ambient temp, my baby booster will start to short cycle after a while and stop pumping any gas. I notice at this point the Humphry valve is covered in ice.
Anyone else have this problem?
I was thinking I could put a heat sink on it or better yet run a pipe from the outlet and use the warmed outlet gas to keep the Humphry valve from freezing.
Any thoughts?

Sutty · 5th April 2008, 18:01

MIne does this too - I stick a wet cloth soaked in hot water over the humphrey valve, but if anyone has a better remedy I'd love to hear it - a new humphrey valve?
What do you mean by outlet gas? If you mean the waste drive gas coming out of the muffler it is Cold. Perhaps a pipe with its outer surface attached to the humphrey valve between HP outlet and the cylinder you are boosting into might work, but if the reason is because the humphrey is on its last legs then replacing it seems a better bet.

Neil

**wedivebc** · 5th April 2008, 18:18

Quote: (Originally Posted by Sutty)

MIne does this too - I stick a wet cloth soaked in hot water over the humphrey valve, but if anyone has a better remedy I'd love to hear it - a new humphrey valve?
What do you mean by outlet gas? If you mean the waste drive gas coming out of the muffler it is Cold. Perhaps a pipe with its outer surface attached to the humphrey valve between HP outlet and the cylinder you are boosting into might work, but if the reason is because the humphrey is on its last legs then replacing it seems a better bet.

Neil

I was thinking the O2 discharge gets warm while boosting. If I could make a couple of wraps of SS pipe around the Humphrey valve it might warm it and prevent this problem. It would also cool the O2 discharge so less pressure loss would occur in the tank?
I just got my booster back from jetsam so I was surprised when it did the same old trick. I guess I am relieved other have the same problem (sorry)

O.C.Diver · 5th April 2008, 23:15

The answer is heat. I think I might try something simple like pointing a hair dryer at it while it's running to see if that solves the problem.

Ted

cameron · 6th April 2008, 03:15

I have have had the same problems with my baby booster. Storing it indoors and not running it when it has been cold solved the problem.

They are delicate little things, thats for sure.

Cam

Numpty diver · 6th April 2008, 11:19

what are you useing to drive it ?.
I normal use 50ltr j tanks but keep them warm ..ie indoors.
I also use a 2.1 scuba pro long hose from a ds4 (SET AT 9 BAR) which i inslate with pipe insalation. ( plumbers store ).
Just to keep it even warmer i use a 60w table lamp just over the top of the boostER
Dean

***jradomski*** · 6th April 2008, 11:32

Quote: (Originally Posted by wedivebc)

Depening on the ambient temp, my baby booster will start to short cycle after a while and stop pumping any gas. I notice at this point the Humphry valve is covered in ice.
Anyone else have this problem?
I was thinking I could put a heat sink on it or better yet run a pipe from the outlet and use the warmed outlet gas to keep the Humphry valve from freezing.
Any thoughts?

all the baby booster I have seen short cycle have all been cycling too fast.. you need to cycle at a MAX of 1 cycle per second.. slower is MUCH better..
also most of these boosters I have seen do this started to get some form of damage on the main bearing due to that part getting too hot due to fast cycling.. Personally my target would be 30 cycles per minute...

Hanssing · 6th April 2008, 14:14

Quote: (Originally Posted by Numpty diver)

what are you useing to drive it ?.
I normal use 50ltr j tanks but keep them warm ..ie indoors.
I also use a 2.1 scuba pro long hose from a ds4 (SET AT 9 BAR) which i inslate with pipe insalation. ( plumbers store ).
Just to keep it even warmer i use a 60w table lamp just over the top of the boostER
Dean

Im im understanding this correctly, then you're insulating you're drivegas?
This drivegas comes from a high-pressure vessel, and due to the adiabatic cooling will be very cold to startwith (frost forming on the 1st.stage and hose), so if anything dont insulate it.....

The heat-transfer required per stroke is "constant" (COnstant gasvolume), so give the booster-system some time for convection by cycling more slowly. I run mine a less then 20 strokes/min, but its also bigger (HII 5G-SS-30) booster.

Regards
Nicolai

5th April 2008, 17:22	#1 (permalink)
wedivebc FIGJAM Current Rebreather/s: Megalodon Other CCR Other Rebreather/s: Not Bought Yet Inspiration Classic Sport Kiss Other CCR Join Date: Feb 2005 Location: Vancouver Island BC Canada Posts: 1,411	jetsam baby booster freezing Depening on the ambient temp, my baby booster will start to short cycle after a while and stop pumping any gas. I notice at this point the Humphry valve is covered in ice. Anyone else have this problem? I was thinking I could put a heat sink on it or better yet run a pipe from the outlet and use the warmed outlet gas to keep the Humphry valve from freezing. Any thoughts? __________________ Cheers, Dave.... Man is the only animal burdened with the knowledge he will eventually die
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5th April 2008, 18:01	#2 (permalink)
Sutty Classic Kiss diver Current Rebreather/s: Classic Kiss Other Rebreather/s: Join Date: Jun 2005 Location: Glossop, Derbyshire, UK Posts: 789	Re: jetsam baby booster freezing MIne does this too - I stick a wet cloth soaked in hot water over the humphrey valve, but if anyone has a better remedy I'd love to hear it - a new humphrey valve? What do you mean by outlet gas? If you mean the waste drive gas coming out of the muffler it is Cold. Perhaps a pipe with its outer surface attached to the humphrey valve between HP outlet and the cylinder you are boosting into might work, but if the reason is because the humphrey is on its last legs then replacing it seems a better bet. Neil __________________ Never forget that life is a finite resource.
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5th April 2008, 18:18	#3 (permalink)
wedivebc FIGJAM Current Rebreather/s: Megalodon Other CCR Other Rebreather/s: Not Bought Yet Inspiration Classic Sport Kiss Other CCR Join Date: Feb 2005 Location: Vancouver Island BC Canada Posts: 1,411	Re: jetsam baby booster freezing Quote: (Originally Posted by Sutty) MIne does this too - I stick a wet cloth soaked in hot water over the humphrey valve, but if anyone has a better remedy I'd love to hear it - a new humphrey valve? What do you mean by outlet gas? If you mean the waste drive gas coming out of the muffler it is Cold. Perhaps a pipe with its outer surface attached to the humphrey valve between HP outlet and the cylinder you are boosting into might work, but if the reason is because the humphrey is on its last legs then replacing it seems a better bet. Neil I was thinking the O2 discharge gets warm while boosting. If I could make a couple of wraps of SS pipe around the Humphrey valve it might warm it and prevent this problem. It would also cool the O2 discharge so less pressure loss would occur in the tank? I just got my booster back from jetsam so I was surprised when it did the same old trick. I guess I am relieved other have the same problem (sorry) __________________ Cheers, Dave.... Man is the only animal burdened with the knowledge he will eventually die
(Offline)

5th April 2008, 23:15	#4 (permalink)
O.C.Diver Helium Addict Current Rebreather/s: Classic Kiss Other CCR Home Build Other Rebreather/s: Not Bought Yet Other CCR Home Build Join Date: Mar 2006 Location: Salisbury MD USA Summers; Wandering Florida Winters Posts: 213	Re: jetsam baby booster freezing The answer is heat. I think I might try something simple like pointing a hair dryer at it while it's running to see if that solves the problem. Ted __________________ Consider this my opinion.......sometimes I'm even right, but remember.........YMMV. Ted Green Charter Boat "OC Diver" http://www.ocdiver.com
(Online)

6th April 2008, 03:15	#5 (permalink)
cameron Classic Kiss 124 Current Rebreather/s: Classic Kiss Other Rebreather/s: Join Date: Apr 2005 Location: Toronto, Ontario, Canada Posts: 247	Re: jetsam baby booster freezing I have have had the same problems with my baby booster. Storing it indoors and not running it when it has been cold solved the problem. They are delicate little things, thats for sure. Cam __________________ Reclaim at work and CCR at home, life is good
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6th April 2008, 11:19	#6 (permalink)
Numpty diver Custom Title Allowed! Current Rebreather/s: Megalodon Other CCR Dolphin Ray Home Build Other Rebreather/s: Other CCR Dolphin Ray Home Build Join Date: Jul 2006 Location: Norway, Bergen Posts: 204	Re: jetsam baby booster freezing what are you useing to drive it ?. I normal use 50ltr j tanks but keep them warm ..ie indoors. I also use a 2.1 scuba pro long hose from a ds4 (SET AT 9 BAR) which i inslate with pipe insalation. ( plumbers store ). Just to keep it even warmer i use a 60w table lamp just over the top of the boostER Dean
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6th April 2008, 11:32	#7 (permalink)
*jradomski* Moderator Current Rebreather/s: Inspiration Classic Sport Kiss Optima rEvo Other CCR Home Build Other Rebreather/s: Inspiration Vision Evolution Megalodon Classic Kiss rEvo Other CCR Home Build Join Date: Mar 2005 Location: "Da" Bronx Posts: 2,900	Re: jetsam baby booster freezing Quote: (Originally Posted by wedivebc) Depening on the ambient temp, my baby booster will start to short cycle after a while and stop pumping any gas. I notice at this point the Humphry valve is covered in ice. Anyone else have this problem? I was thinking I could put a heat sink on it or better yet run a pipe from the outlet and use the warmed outlet gas to keep the Humphry valve from freezing. Any thoughts? all the baby booster I have seen short cycle have all been cycling too fast.. you need to cycle at a MAX of 1 cycle per second.. slower is MUCH better.. also most of these boosters I have seen do this started to get some form of damage on the main bearing due to that part getting too hot due to fast cycling.. Personally my target would be 30 cycles per minute... __________________ 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.
(Online)

6th April 2008, 14:14	#8 (permalink)
Hanssing flap-flop ..... flap-flop Current Rebreather/s: rEvo Other Rebreather/s: rEvo Join Date: Nov 2005 Location: Denmark Posts: 378	Re: jetsam baby booster freezing Quote: (Originally Posted by Numpty diver) what are you useing to drive it ?. I normal use 50ltr j tanks but keep them warm ..ie indoors. I also use a 2.1 scuba pro long hose from a ds4 (SET AT 9 BAR) which i inslate with pipe insalation. ( plumbers store ). Just to keep it even warmer i use a 60w table lamp just over the top of the boostER Dean Im im understanding this correctly, then you're insulating you're drivegas? This drivegas comes from a high-pressure vessel, and due to the adiabatic cooling will be very cold to startwith (frost forming on the 1st.stage and hose), so if anything dont insulate it..... The heat-transfer required per stroke is "constant" (COnstant gasvolume), so give the booster-system some time for convection by cycling more slowly. I run mine a less then 20 strokes/min, but its also bigger (HII 5G-SS-30) booster. Regards Nicolai __________________ Woohooo - I can change my rEvo! Its going to be bitchin' tricked out piece of gear
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