Power Generation: Product Operation and Maintenance

[sachinpalakkat]

Dear sir, we have one diesel engine with 6 mw capacity.We are using Nalco chemical as coolant additive for its HT & LT Water circuit. The nitrate level of both circuit is nearly 1100 ppm.But from last few days we observed that the color of LT circuit water is very different from HT cxircuit. Eraliear the color of both circiuts was Red. Now the LT circiut water color is Ash color.Why its happaning.

[JAMES007]

KINDLY THROUGHLY  CHECK  YOUR LT CKT, BRUNTFUEL, EXH LEAKGE OR LUBE OIL DEPOSITE  MAY GET ENTERED.

CHECK UR LT CKT TEMP AND PRESSURE, OIL COOLER CHOKE UP.

POSSIBILITY OF DIRT OR DUST MAY GET ENTER FROM OUTSIDE TO EXPANSION OR MAKE UP TANK.

REGARDS.

[jkearney]

Gentlemen,

Coolant discoloration can be the result of several conditions within your cooling system. When evaluating the following areas need to be looked at

Has there been any hi-temp or overheating issues with engine

What is the condition of the cooling system overall, ie. heat exchangers, radiators etc. scale, rust, and corrosive actions within the cooling system can contribute discoloration

Has the delta p been checked to verify there are not any flow issues in the system, "stalling" or restrictions in the coolant system can create hot spots which can discolor the coolant

Has the oil cooler been checked or cleaned recently?, Cross contamination from pin hole leaks in the bundle can allow trace amounts of oil to passed from the higher pressure oil side to lower pressure cooling system causing discoloration.

Finally has a coolant sample been taken and sent for level II analysis to determine the presence of contamination.

Hope this helps

[josh_lukejan]

Ash color? meaning your engine  Lt cooling water got oil dilution or your LT water ckt. was penetrated by engine oil.