Some power stations in Australia have moved away from
using gaseous chlorine to a Nalco bioscide. Apparently
it is purely cost driven rather than a safety issue.
Perhaps you can pursue this as an option. --- Ahmed
Vawda <avawda@aksugar.co.ae> wrote:
<HR>
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<tt>
Hello Rakesh<BR>
<BR>
You are quite correct. Dosing them separately would be
fine, but note the<BR>
ffg conditions.<BR>
<BR>
I am not sure what state the chlorine is in, perhaps
its liquid, (some big<BR>
systems use gas, got to take care here.)<BR>
If it is a liquid, usually sodium hypochlorite comes
at a concentration of<BR>
12%. This is often dosed to obtain a residual in the
cooling water circuit<BR>
of 0.2 - 0.5 PPM.<BR>
The H2So4 comes in conc. of max. 98%. I am not sure if
you are obtaining a<BR>
98% or a diluted form.<BR>
In any event, if both chemicals are added separately,
and all care<BR>
engineered that they do not mix in their
"supplied" state, it should be<BR>
perfectly acceptable.<BR>
<BR>
I used to use hydrochloric acid in my swimming pool to
get the pH below 7.8.<BR>
The pool always had a minimum chlorine residual of 0.2
PPM. Its quite safe.<BR>
One could drink it if one liked.<BR>
<BR>
Ahmed Vawda<BR>
Process Engineer<BR>
Al Khaleej Sugar - Dubai<BR>
<BR>
<BR>
<BR>
-----Original Message-----<BR>
From: RAKESH PATIL [mailto:rpa@epc.ltindia.com]<BR>
Sent: Wednesday, March 20, 2002 5:17 PM<BR>
To: avawda@aksugar.co.ae;
PipingDesign@yahoogroups.com<BR>
Subject: RE: [PipingDesign] Commissioning
Activities<BR>
<BR>
<BR>
** High Priority **<BR>
<BR>
<BR>
Dear Mr Ahmed Vawda,<BR>
<BR>
As you have mentioned that mixing of chlorine and
H2So4 is not advisable for<BR>
system, then what should be done if the pH value of
water goes beyond the<BR>
desirable reqmnt of system and at same time chlorine
percentage get reduced<BR>
in the system?<BR>
<BR>
As per reqmnt we have to reduce the pH by dosing H2So4
Acid in water and at<BR>
same time we may require to maintain the percentage of
Chlorine in water to<BR>
restrict the biological growth in water. But while
dosing both in water if<BR>
one dose them separately then there should not be any
harm. if it is harmful<BR>
then what should be the solution for it? <BR>
Pls suggest.<BR>
<BR>
regards,<BR>
rakesh<BR>
<BR>
>>> avawda@aksugar.co.ae 03/20/02 11:06am
>>><BR>
<BR>
</tt>
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