cleaning 27 yr. old chilled water coils

Hi jray,

Check this video out. It is very instructive despite the speaking ability of the narrator:

http://www.youtube.com/watch?v=KbEfHpka3ec

A list of A/C coil cleaners:

http://www.mainsupplies.com/index.php?main_page=index&cPath=60&zenid=74a3000279f15990d68b6ff9be16cc85&gclid=CNXX1OjmkJ0CFSBN5Qodn3lx1w

http://www.interstateproducts.com/coil_cleaner.htm

http://www.ductbusters.com/equipment/coil_clean.htm

All this through a simple internet search.

Mike

Depending on what you intend to get rid off, the best chemical free way is still steam cleaning. Make certain the pressure is not too strong to damage the coil. Try it and see, literally see the miracle of steam cleaning power!

these were probably over designed in the first place if they got more and more clogged over 27 years and only now demand replacement.

Suggest you get a capable design team to compute the correct size, replace them and clean them on a regular basis with the cc-600 and do not wait 27 years.

This will probably be cheaper than replacing the overdesigned and clogged coils with new overdesigned ($$$) coils

CHEMICAL CLEANING WILL BE BEST. ARRANGE ONE PUMP, TANK AND CIRCULATE THE CHEMICAL TO REMOVE SCALE. REGARDING CHOICE OF CHEMICAL, CONSULT SOME CHEMISTRY PERSON OR OEM OF THE CHILLER

REGARDS

IRSHAD

www.marinerschoice.net

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"are they cleanable" - maybe.

"do we replace them?" - if you want.

Sorry for sounding like a "wise guy", but there are a ton of unidentified variables before anyone could venture a reasonable answer to this.

What are these coils serving? Is the space critical of can you go a month while the coils are replaced?

What is the external condition of coils? What is remaining tube thickness? What is fin condition?

Have conditions changed that a redesigned coil is justified? Original coil lasted 27 years. Was it well designed? Or did it limp along because no one paid attention to it?

What was circulated through the tube? untreated water? glycol solution? tri-methyl death?

What is the space available to wrestle the old coils out vs wrestling new coils in? It could take a week or a month for a crew to make a change out.

There probably is not a cut and dried economic choice, but a gut feel based on long term plans for operating your facility.

Hello Jray,

What is the contamination, that you want to clean from the coil/fins, hotwater and even a good chemical will not clean some surfaces, let me know the surface, material, contamination to be cleaned etc.

Aluminum coil fins, the air passing through the coils is non-corrosive, outside air is sometimes very dusty, the matter that is coming out of the coil is hard deposits about the size of a #2 pencil lead, large granules. The interior of the outside of the coil is very difficult to reach with this coil washer. We are having some success but now it takes much time to remove small amounts of deposits.

"27 year old chilled water coils that have never been cleaned before"

I'd say you've got your justification to replace it based on:

• Permanent loss of efficiency caused by corrosion and pitting
• Potential EPA/OSHA liability created by continuing to operate faulty/degraded equipment that could lead to a refrigerant release or a technician being hurt.

"If you know about it they call it negligence"

I inherited an ammonia refrigeration plant that had been neglected for years and regretted almost everything that we repaired instead of replaced.

If the coil that you have is copper tubes with aluminum fins, then the price for that coil would be around $6300.