Cleaning of live chilled water system

http://en.wikipedia.org/wiki/Pigging

Dear Guest,

It is the first time I read for pigging, however it seam very special process and expensive way, used to remove the heavy and stick contentment and it is More likely to use with straight pipes, or flanged ends but it will be difficult to us In rout has many elbows, Do you agree with me?

Agreement isn't necessary in this forum.

And doing nothing can be <...expensive...>.

If it is a closed circuit reticulating CW swstem, you should never have to clean it out. If you think there are contaminants then quickly drain the system and re-fill with fresh water or coolant whichever is applicable. There should be a normal "Y" type strainer in the system anyway, which can be mechanically cleaned fairly quickley.

You can insert a bag filter in your chemical shot feeder for the system. The filters come in different micros.

Greetings,

I am so interest for your suggestion can you tell me more about bag filter and location?

This is the web page for the bypass shot feeder.

http://www.neptune1.com/pumps/bypass.htm

The shot pot feeder at the 6 speed is a FTF-5HP. It is shown a couple pages down on the attached sheet. This unit will filter the water, as well as, provide a container to add treatment. Both are critical to a having a clean closed loop. Let me know if a quote is needed.

Thank you,

Jeff C. Holtyn
ChemTreat

I have contacted the supplier of the shot feeder and the filters that were used on the GM Toledo Powertrain SCHW system. We installed the shot feeder across one of the three secondary chilled water pumps. We used that pump for one week to remove the rust and other suspended particals. We cleaned the bag filter once per day. After the first week we rotated the pumps and continued to use the shot feeder as a filter to clean the water. The water continued to flow thru the shot feeder because of the DP. (If you install one it would be best to install it across the common supply and return header). We still check and clean the filter once a week because we are still adding equipment from the process part of the plant. I had my doubts that the 1" inlet and outlet on the shot feeder would clean the system. I was wrong. It is crystal clear at this time. (3 months). The filter that is in the feeder at this time is a 20 micron.

Thank you goalmaker for your perfect response, and your efforts to contact the supplier, I will recommend your suggestion for such projects which capabel to add a new units after starting.

Best Regards

Do you have your system cleaned?

Is it rust in your water or biological growth? If it is rust, you can inject a scrubber chemical that will clean off the sides of your pipe and then hold the rust in suspension until you turn the water over with fresh water. Biological might be more difficult to remove, but you could at least kill it with a biocide agent. How are you currently treating your water?

Dear Betomachine,

I appreciate your input, but adding secrabur will blocked the very fine Y Strainers and blocked them,most of the units are difficult to accessible. can we remove the non accessible strainers until the ending of re-cleaning of the system? I mean will the FCU's cooling coils be effected if the strainers basket removed temporary?

Best Regards

I see that I am a little late to this discussion.

Every closed system should have a side-stream filter installed across the recirculating pump. I generally prefer a filter feeder which uses a bag type of filter. I start with 20 micron bags.

Once they fail to remove any more material, I would recommend the addition of a chemical cleaner such as our SCS-3500-S product. This will cause the removal of more material from the system. Continue to filter at 20 microns until that is no longer effective, then drop the micron size down to 5 micron.

Once the system is clean, it is now time to add the inhibitor.

You should also look into how the system became contaminated. Most often the "closed" system was not really closed and fresh water was entering the system which diluted the inhibitor and brought in corrosive dissolved oxygen. A water meter should be added to the make up line to determine if water is being added to the system.

If you suspect bacteria contamination, then I would suggest running a Sulfate Reducing Bacterial (SRB) test and/or an ATP test.

A treatment product could be used that will also control bacterial contamination if that appears to be necessary.

Sometimes, a conductivity controller is used to add more treatment to the system if the conductivity falls too low from the addition of make up water. This is a last resort which is to be used if and only if you cannot find and stop the leak.

Dick Hourigan

www.RichardHouriganInc.com