We offer two methods to scrub a cooling tower/chiller. The primary being a mechanical cleaning and the second being a chemical cleansing. At instances, it’s possible you’ll should encompass each strategies in order to accomplish the duty at hand. Consult your water remedy rep. and have him help you in figuring out one of the best procedure.
Chemical cleanings contain three distinct separate procedures. One being the use of a dispersant to loosen biomasses and get into difficult areas.. The second being the use of acid for extreme scaling. The third is a disinfection for bacteria and Legionella prevention and elimination. You may have to find out which methodology is finest suited in your state of affairs. You might have to make use of a mix of the three in some instances. Seek the advice of your water treatment specialist if you have any questions.
COOLING TOWER PRE-Cleaning PREPARATION
Whether or not you might be mechanically or chemically cleaning a cooling tower, these steps must happen first. It will be significant that each step be adhered to. The order of the steps will be fluctuated but every step should be achieved to insure your security.
1. The tower have to be isolated from the system. Turn off and secure the electrical service to the tower. Make certain the tower fan is off, the primary circulating pumps are off, and the temperature sensors are off or put in a none operational mode. Lock out and tag out the primary power swap.
2. Close the valves that supply and return water to and from the tower.
Three. Shut the make up water valve to the tower.
Four. Open bottom drain of the tower. Remove overflow pipe.
5. Remove the grate masking the suction intake for cleansing if attainable.
6. Have a separate backyard hose ready, charged, and place in tower as soon as the tower has been drained out. Have your squeegee, broom, and shovel prepared and place in tower.
7. Suit up with water proof boots, coveralls, gloves, hat, and face protection.
Eight. Start your cleaning. As soon as cleaned, reverse the process for startup.
Such a cleaning will contain the use of a energy washer, a garden hose with energy spray nozzle, shovel, broom, and squeegee. Such a cleaning in designed to remove all algae, slight scale, dirt, mud, and collected debris. The aim is annual cleanings and removing of dirt to regain cooling efficiency. At occasions it’s strictly cosmetic.
Starting at the new deck, utilizing the strain washer, wash cooling tower blades, display, inside of exhaust collar, and scorching deck. Take away the covers of the recent deck and make sure all drain holes are free of scale and debris. Wash total space the place water flows to the fill. Make observe if any spray nozzles are lacking or broken. Inform chief engineer if they’re.
Be careful when cleaning the fill with a stress washer. The stress and stream will trigger the fill to interrupt easily and snap off. Use a spray stream and never a straight stream. Clear the fill from prime to bottom, outside and inside. Wash the sump space, additionally exterior and beneath the fill.
Clean the inside of the tower fill, high to backside, the partitions, and beneath the fan blades. Remove all indicators of algae, dirt and debris from float valve. Utilizing the shovel or squeegee, be sure the floor of the sump is clean and free of all mud and deposition. Use your hose to clean beneath fill and inside of fill. After wash out is over, examine to make certain no loose scale has broken off and isnt lodged someplace in the underside of fill.
When completed, shut the drain, reset over flow pipe, and open the make up valve to refill tower. Add sufficient chemical for startup. Consult together with your water therapy rep. for the correct quantity of chemical so as to add to the tower. As soon as the tower is crammed, slowly open provide and return valves. Tower might add extra water as soon as the provision and return valves are open as to displace trapped air. Take away lock out and tag out supplies. Have chief engineer examine tower and have him start electrical service to begin tower. Watch the water stage to be sure it remains at ample levels for operation. Once tower is in service, have chief engineer sign off in your report that tower cleaning is completed.
That is much more concerned than a mechanical cleaning. It is advisable to first set up the purpose of the chemical cleaning. This is very important. Consult with your water treatment rep. There are a number of steps/tests that have to be performed prior to the precise cleaning. This is very important.
Kinds of Chemical Cleaning
The usage of a biodispersant alone will help take away dirt and loosen bio lots for straightforward removing. This is the most favorable safest, and easiest type of chemical cleansing. The use of a biodispersant along with both an algaecide (chlorine) or biocide will insure that each one biomasses, silt, and deposition are decreased and can extra easily be mechanically removed.
If a tower has not been used, is in a stagnant state or is extremely fouled and wishes cleansing, a bacteria test must be performed first to determine bacteria ranges. If micro organism ranges exceed the center of Illness Controls regulation of ten to the fifth ranges, the tower should be disinfected. Excessive levels of chlorine and sodium bromide are to used together with a biocide, either gluteraldehyde or isothiazalin, and a biodispersant to insure that each one traces of biological progress are killed. These chemicals must be recirculated for two-6 hrs. earlier than the precise mechanical cleaning process begins. Tower must be retested for bacteria situations prior to discharge of chemicals and the mechanical course of can start.
SCALED COOLING TOWERS AND CHILLERS
If a tower is closely scaled, and an acid cleansing is decided to be the simplest method of reducing or removing the size, your water remedy specialist should be contacted. He will determine the kind and quantity of acid that is needed to descale the tower. As soon as the proper acid is set, the acid will likely be added by way of a particular chemical tank and recirculating pump. The solution shall be recirculated for a number of hours. Once the acid has exhausted itself (determined by a pH take a look at and bodily inspection), it’s neutralized after which dumped. If a second application is required, the water remedy rep. will reapply the answer with new acid and recirculate it for several more hours. As soon as the water treatment rep. determines that the scale has been dissolved, or loosened off where it may be mechanically eliminated, he will neutralize the answer, retest, and drain the tower. This can insure that the interior portion of the tower is protected to begin the mechanical cleaning. Security is primary at all times. Ensure the service rep. is totally dressed and covered before getting into the tower.
Your water remedy rep. will analyze the size and determine the most effective acid to use to dissolved the scale. The neutralization course of includes a mix of caustic chemicals to insure that the tower resolution has a pH of 7.0 to 7.4. before discharge. It is a time consuming course of and requires an incredible deal of labor to insure the security of the service reps. Time and materials plus labor are charged for this course of.
The mechanical cleansing is the least expensive of the three processes. The disinfection is subsequent followed by the descaling. The water therapy division will work hand in hand with the service reps. who’re assigned to scrub a tower.
Consult with your water treatment rep. in case you have a tower cleansing scheduled. This may give him adequate time to order the necessary chemicals and supplies based mostly upon his evaluation. We want to make your job simpler and insure your security.