Rebreather World - View Single Post

iain-hsm · 30th March 2007, 14:39

Quote: (Originally Posted by jmurba)

Ha yes,

our friend Tom is sometime difficult to understand for me... I am French...
I had not understand this clearly, i tought he was only deploring not to be able to increase a little bit the pressure without braking the guarantee.
I think that a skilled mechanic or technician could easily turn a screwn and increase the pressure in a reasonnable rage, say 25 bars more or so....

regards

jean mi

As this is a compressor not a booster it's designed output pressure of
155 barg (2200psig) working pressure is when using the ½ hp motor and speed reduction gear box. To increase to 207 barg (3000psig) would:

Produce 30% more load on the motor
Increase rod loadings
Increase temperature generated
Increase inter stage pressures in 2nd stage and 3rd stage

Now if you were to physically tamper and increase the pressure switch setting and final stage relief valve setting you would by doing this:

The increased motor overload and relays now to close to trip overload.
The inter stage relief valves (non adjustable) would be on the point of venting.
The compressor cooling would have to be increased pro rata possible additional cooling coils or additional heat exchanger
Rod loads are above the engineering design loading.

I hope we understand that it’s less some arbitrary bullshit warranty problem and more sound practical engineering practice and principle. Iain Middlebrook

30th March 2007, 14:39	#24 (permalink)
iain-hsm Custom Title Allowed! Current Rebreather/s: MK 15.X Other CCR Other SCR Other Rebreather/s: Other CCR Other SCR Join Date: Mar 2005 Location: Loughborough England uk Posts: 347	Re: air driven Vs manual booster Quote: (Originally Posted by jmurba) Ha yes, our friend Tom is sometime difficult to understand for me... I am French... I had not understand this clearly, i tought he was only deploring not to be able to increase a little bit the pressure without braking the guarantee. I think that a skilled mechanic or technician could easily turn a screwn and increase the pressure in a reasonnable rage, say 25 bars more or so.... regards jean mi As this is a compressor not a booster it's designed output pressure of 155 barg (2200psig) working pressure is when using the ½ hp motor and speed reduction gear box. To increase to 207 barg (3000psig) would: Produce 30% more load on the motor Increase rod loadings Increase temperature generated Increase inter stage pressures in 2nd stage and 3rd stage Now if you were to physically tamper and increase the pressure switch setting and final stage relief valve setting you would by doing this: The increased motor overload and relays now to close to trip overload. The inter stage relief valves (non adjustable) would be on the point of venting. The compressor cooling would have to be increased pro rata possible additional cooling coils or additional heat exchanger Rod loads are above the engineering design loading. I hope we understand that it’s less some arbitrary bullshit warranty problem and more sound practical engineering practice and principle. Iain Middlebrook
(Offline)