Good afternoon wise folk of ScubaBoard. I have two questions surrounding filtration for my Coltri MCH6.
I have the 13X and carbon to perform a filter re-pack. I initially was planning on using similar ratios to the existing filter (1 part carbon, 2 parts 13X). But looking at the www.scubaegineer.com ( Stephen e Burton BSc(hons) C.Eng., MIET)’s spreadsheet, the 13x lifetime when using the standard MCH6 MS/AC Standard Filter amounts of Carbon (20 grams) and 13x (25 grams), is significantly lower than the carbon (2.04 hours for 13x vs 50 hours for carbon).
It appears that you would be able to use a filter for longer if you put more 13X in and less carbon. Trying to game the spreadsheet, 3 grams of carbon and 42 grams of 13x would give the longest filter performance (assuming roughly even densities), but I feel this is not enough carbon. I understand that once the 13x is fully used, the water coats the carbon and makes it useless.
I am not using hopcalite as I run an electric compressor (and test for CO too just to be sure).
TL;DR 1: Does anyone when repacking filters use this spreadsheet to try and get the maximum lifetime out of their filters by changing the ratio of carbon to 13-X? If so what ratio do you run with and why?
With the MCH6, I have just replaced the 4th stage piston and housing, as the old one was worn. From my reading, the thing which can kill these is when the compressor is left for a long period and the water which inevitably penetrates the synthetic oil sinks to the bottom of the sump (where the 4th stage is located). I understand the water corrodes the 4th stage when it sits there for a while.
TL;DR 2 Could the compressor be stored propped up on one side, to make the lowest point be somewhere in the housing with the water running to it, rather than at the 4th stage? Any issues with this?
Thank you.
Tony
I have the 13X and carbon to perform a filter re-pack. I initially was planning on using similar ratios to the existing filter (1 part carbon, 2 parts 13X). But looking at the www.scubaegineer.com ( Stephen e Burton BSc(hons) C.Eng., MIET)’s spreadsheet, the 13x lifetime when using the standard MCH6 MS/AC Standard Filter amounts of Carbon (20 grams) and 13x (25 grams), is significantly lower than the carbon (2.04 hours for 13x vs 50 hours for carbon).
It appears that you would be able to use a filter for longer if you put more 13X in and less carbon. Trying to game the spreadsheet, 3 grams of carbon and 42 grams of 13x would give the longest filter performance (assuming roughly even densities), but I feel this is not enough carbon. I understand that once the 13x is fully used, the water coats the carbon and makes it useless.
I am not using hopcalite as I run an electric compressor (and test for CO too just to be sure).
TL;DR 1: Does anyone when repacking filters use this spreadsheet to try and get the maximum lifetime out of their filters by changing the ratio of carbon to 13-X? If so what ratio do you run with and why?
With the MCH6, I have just replaced the 4th stage piston and housing, as the old one was worn. From my reading, the thing which can kill these is when the compressor is left for a long period and the water which inevitably penetrates the synthetic oil sinks to the bottom of the sump (where the 4th stage is located). I understand the water corrodes the 4th stage when it sits there for a while.
TL;DR 2 Could the compressor be stored propped up on one side, to make the lowest point be somewhere in the housing with the water running to it, rather than at the 4th stage? Any issues with this?
Thank you.
Tony
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