Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Rate Thread Display Modes
Old 05-08-2015, 07:56   #1
Registered User

Join Date: Mar 2011
Location: Caribbean
Boat: Oyster 66
Posts: 973
Descaling the calorifier

My shower was blocked by scale debris from the hot water pipe, presumably breaking free from inside the calorifier, so I think I should clean it. Digging out the mixer valve for the shower to unblock it was a really fiddly task that I would rather not do again.

Is there a best practice way to do this? I believe phosporic acid is often used for cleaning scale from kettles - would this be a good choice here? What concentration? I couldn't find anything in the archives - has anyone done it?
__________________

__________________
poiu is offline   Reply With Quote
Old 05-08-2015, 08:56   #2
Registered User
 
UNCIVILIZED's Avatar

Join Date: Jun 2014
Location: Up the mast, looking for clean wind.
Boat: Currently Shopping, & Heavily in LUST!
Posts: 5,629
Re: Descaling the calorifier

I haven't done the job you're referring to, but am familar with mineral scale, in some of it's various forms. That, plus one gentle but slow method to get rid of it. And a couple of hypothetical, more agressive methods.

You could start mild, & try heating Distilled water to as high a temp in it as you can. Changing the water frequently.
The idea being, that because distilled water is so "clean" it'll "pull" out/off some of the minerals when you heat it. Which is the reverse of what got you into that fix. Such being, that heating standard water, with a fair mineral content to it, left behind said minerals, when you emptied the unit of hot water each time.

Plan B would be a mild acid. Like say Vinegar (Acetic Acid). I wouldn't heat that, but just let it soak, & see if the vinegar will eat the scale. As, for example, if you drop sea shells or similar (which I think are calcium carbonate) into Vinegar, you can watch them bubble & dissolve.

And as crazy as it sounds, Coca Cola might be another option. As it acts similarly to Vinegar, being an acid itself. Phosphoric I think, actually.

Also, assuming that it's not a vessel used to heat potable water, you might try CLR or orther commercial, household, scale removers. Although what I'd be willing to use on it experimentally, would be based a lot on the replacement price of the item.

As usual, the last resort - Try talking to the company which made it. AKA "the instruction manual" (which you likely can find for it online).
__________________

__________________

The Uncommon Thing, The Hard Thing, The Important Thing (in Life): Making Promises to Yourself, And Keeping Them.
UNCIVILIZED is offline   Reply With Quote
Old 05-08-2015, 09:09   #3
Moderator
 
a64pilot's Avatar

Cruisers Forum Supporter

Join Date: Oct 2013
Location: Albany Ga.
Boat: Island Packet 38
Posts: 17,045
Re: Descaling the calorifier

My scale is coming from my water tank, it's aluminum and is pretty much covered in calcium.
I installed a water filter just after my water pump and now I don't have to go around cleaning "sand" out of my faucets, etc. anymore.
__________________
a64pilot is offline   Reply With Quote
Old 05-08-2015, 17:27   #4
Registered User

Join Date: Mar 2011
Location: Caribbean
Boat: Oyster 66
Posts: 973
Re: Descaling the calorifier

Quote:
Originally Posted by a64pilot View Post
My scale is coming from my water tank, it's aluminum and is pretty much covered in calcium.
I installed a water filter just after my water pump and now I don't have to go around cleaning "sand" out of my faucets, etc. anymore.
Sound like you have the same problem. But isn't the water pump after the cold tank? You shouldn't have scale there.
__________________
poiu is offline   Reply With Quote
Old 05-08-2015, 17:33   #5
Registered User

Join Date: Mar 2011
Location: Caribbean
Boat: Oyster 66
Posts: 973
Re: Descaling the calorifier

Quote:
Originally Posted by UNCIVILIZED View Post
I haven't done the job you're referring to, but am familar with mineral scale, in some of it's various forms. That, plus one gentle but slow method to get rid of it. And a couple of hypothetical, more agressive methods.

You could start mild, & try heating Distilled water to as high a temp in it as you can. Changing the water frequently.
The idea being, that because distilled water is so "clean" it'll "pull" out/off some of the minerals when you heat it. Which is the reverse of what got you into that fix. Such being, that heating standard water, with a fair mineral content to it, left behind said minerals, when you emptied the unit of hot water each time.

Plan B would be a mild acid. Like say Vinegar (Acetic Acid). I wouldn't heat that, but just let it soak, & see if the vinegar will eat the scale. As, for example, if you drop sea shells or similar (which I think are calcium carbonate) into Vinegar, you can watch them bubble & dissolve.

And as crazy as it sounds, Coca Cola might be another option. As it acts similarly to Vinegar, being an acid itself. Phosphoric I think, actually.

Also, assuming that it's not a vessel used to heat potable water, you might try CLR or orther commercial, household, scale removers. Although what I'd be willing to use on it experimentally, would be based a lot on the replacement price of the item.

As usual, the last resort - Try talking to the company which made it. AKA "the instruction manual" (which you likely can find for it online).
I should have said, it's a 60 litre non potable tank, so coke won't work on cost grounds. qualifies on non potable though.

Needs to be cheapish really.
__________________
poiu is offline   Reply With Quote
Reply

Tags
cal, calorifier

Thread Tools
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Troubleshooting Engine Waste Heat Calorifier Loop Dockhead Plumbing Systems and Fixtures 4 04-10-2011 15:26
Descaling Solution wingover Engines and Propulsion Systems 4 20-04-2011 17:33
Gas Water Heater or Combined Calorifier / Immersion Heater ? simonmd Plumbing Systems and Fixtures 5 30-12-2010 08:50
Calorifier Puzzle Dockhead Plumbing Systems and Fixtures 3 12-08-2010 18:42
Horizontal Calorifier anjou Plumbing Systems and Fixtures 3 01-07-2010 03:11



Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 13:52.


Google+
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.