[labnetwork] DI costs - DIW maintenance

Fri Oct 5 13:15:17 EDT 2012

Hi Bob,

So here are the answers to the questions about my system, see below:

Le 2012-09-29 à 11:45, Robert M. Hamilton a écrit :

> Matthieu Nannini,
> 
> To open the dialogue parameters for your system are needed:
> 1) What' the analysis of the water you are starting with?
289 uS/cm
pH: 7.79

> 2) How much RO makeup are you using
7.5usgpm
> and what is the makeup's final resistivity (conductivity)?
20uS/cm
for operation 10h/day 5 days a week.

> 3) What is your DI spec? The desired total-silica value partly determines the polishing bed performance. It is the first breakthrough product.
R > 18 megohm/cm
TOC (max): < 100 ppb
Silica (disolved): < 5ppb
Sodium: < 0.1ppb
Bacteria (1000 mL): < 10
Particle/L (SEM): < 10 (1um size)

> 4) What's the DI loops recirc. gpm?
40 usgpm @ 50psi
> 5) How many polish beds are in use and are they in a lead/lag configuration?
4 Mixed bed in parallel + 4 other in parallel
> 6) Do you blanket your DI reservoir with N2?
not N2 available at DIW plant site. we have a 0.1um filter for vent
> 7) How much DI is being removed from the loop?
5 to 12 usgpm
> 
> Berkeley can share our numbers but we need to compare the systems specs. Regrettably, the costs don't scale with system size.
> 
> Bob Hamilton
> 
> Bob Hamilton
> Marvel NanoLab
> University of CA at Berkeley
> Rm 520 Sutardja Dai Hall
> Berkeley, CA 94720-1754
> bob at eecs.berkeley.edu
> (e-mail preferred)
> 510-809-8600
> 510-325-7557 (mobile - emergencies)
> 
> On 9/28/2012 10:46 AM, Matthieu Nannini, Dr. wrote:
>> Dear colleagues,
>> 
>> Reviewing my annual costs and trying to find places where I could save money I realized that one of my main maintenance expense was on DIW. I pay about 10,000$/y to a contractor that is doing monthly and annually maintenance on the mixed bed and anionic cylinders. I have full confidence in this contractor and I don't have to worry about the DIW plant. However, everytime I issue a PO I can't help but thinking it's quite expensive.
>> 
>> I'd like to know if I'm in the normal range or not.
>> 
>> Thanks
>> 
>> Matthieu
>> _______________________________________________
>> labnetwork mailing list
>> labnetwork at mtl.mit.edu
>> https://www-mtl.mit.edu/mailman/listinfo.cgi/labnetwork
> 
> 
> _______________________________________________
> labnetwork mailing list
> labnetwork at mtl.mit.edu
> https://www-mtl.mit.edu/mailman/listinfo.cgi/labnetwork