Coolant Ph

A place to exchanges questions and ideas of a technical / procedural nature. Go ahead, try to stomp us !
BilgeRat1
Tanktop Cleaner
Posts: 15
Joined: Tue Jun 03, 2008 3:53 am
Currently located: Northern Illinois, USA

Coolant Ph

Postby BilgeRat1 » Tue Jan 31, 2012 9:09 pm

Does anybody have any idea of what Ph I should be looking for in an EMD 645 cooling system running Nalcool 2000 and no antifreeze?
Thanks,
Tom
"It is not that there are too many fools on earth, it is just that the lightning is distributed unevenly."
Mark Twain

User avatar
JollyJack
Fleet Engineer
Posts: 1128
Joined: Wed Mar 24, 2010 3:57 am
Currently located: Eastern Canada

Re: Coolant Ph

Postby JollyJack » Thu Feb 02, 2012 5:37 am

In general, when pH points to acidic environment, the chances for corrosion increase and when pH points to alkaline environment, the chances for scale formation increase.

The pH values above 7 signify alkalinity, pH values less than 8.3, most of the alkalinity in the water is in the bicarbonate form, and scale formation is normally not a problem. However, when the pH rises above 8.3, the alkalinity converts from the bicarbonate to the carbonate and the scale will start to form. You want to keep the water alkaline, but not too alkaline. 10 or 11 is great for boilers where scale inhibitors are added to water treatment, but cooling water should be in the 8 - 8.5 range, not more than 9. Nalcool 2000 is particularly suited for small medium speed engines like the EMD (which, in my opinion is the best medium speed engine ever made, designed to be run and maintained!) and the recommended concentration of that chemical additive will maintain Ph in the required range.

You might want to keep an eye on other parameters, too, eg:
Total hardness, 170ppm Max
Chlorides, 40ppm Max
Sulphates, 100ppm Max
TDS 340 Max (Total Dissolved Solids)

Your Nalcool supplier should be able to provide a suitable test kit.
Discourage incest, ban country "music".

User avatar
The Dieselduck
Administrator
Posts: 2748
Joined: Sun Jul 22, 2007 1:41 pm
Currently located: Nanaimo, British Columbia, Canada (West Coast of Canada)

Re: Coolant Ph

Postby The Dieselduck » Thu Feb 02, 2012 10:04 am

Attached is the EMD notes on Coolants. They don't make mentions of the pH exactly, but there is some reference in there.
Attachments
EMD 645 Blower engine MI 1748 (coolant).pdf
EMD coolant specs
(354 KiB) Downloaded 494 times
Martin Leduc
Certified Marine Engineer and Webmaster
Martin's Marine Engineering Page
http://www.dieselduck.net

BilgeRat1
Tanktop Cleaner
Posts: 15
Joined: Tue Jun 03, 2008 3:53 am
Currently located: Northern Illinois, USA

Re: Coolant Ph

Postby BilgeRat1 » Sat Feb 04, 2012 9:30 pm

Thanks guys. We have had no way of testing coolant since about 2007; seems they didn't put too high of a priority on finding a way for us after Dearborn's little conductivity testers went away. This past trip out, we got test strips that also checked Ph, so I was curious. My Ph came in at about 8, and minerals are not a problem as we run a water softener on board. We treat with Nalcool 2000. Chalk this one up to blind luck, but my Nalcool levels were at the recommended levels on everything except the SME, and it only needed a gallon to bring it up to spec. Good to know it's all good,
Tom
"It is not that there are too many fools on earth, it is just that the lightning is distributed unevenly."
Mark Twain

User avatar
Big Pete
Engineering Mentor
Posts: 817
Joined: Fri Apr 24, 2009 11:18 pm
Currently located: Solihull, England

Re: Coolant Ph

Postby Big Pete » Sun Feb 05, 2012 12:37 pm

Good, always welcome to hear the results after people ask questions.
BP
It is always better to ask a stupid question than to do a stupid thing.


Return to “The Workshop”

Who is online

Users browsing this forum: No registered users and 1 guest