[MW:675] Re: 664] Chemical cleaning for Marine boilers

Thanks for the information below. 

 

The chemical cleaning is for newly built boiler at yard and will be erected in FPSO.

We are doing chemical cleaning to remove mild scale and grease.
 

 

Thanks

Sriram.
 

On 3/19/08, donboscomarine@vsnl.net <donboscomarine@vsnl.net> wrote:

Dear Mr. Sriram,
You may please consult either Drew Ameroid or Unitor chemicals which are the standrad suppliers for chemicals in most of the ports. Here I am assuming, you are talking about a boiler fitted presently on the ship and not removed to the yard, as such. If at all the boiler is an exhaust gas economiser ( or exhaust boiler in Marine engineering terms) and is choked near the side where exhaust gas enters the shell, it is going to be extremely dificult and impossible at times to get the tubes cleaned internally by chemical circulation or soaking . If it is a new boiler then only a detergent plus mild alkali/ acid circulated and later a neutralising solution with fresh water washing will be enough.

Rgds.

G. A. Soman
Don Bosco Maritime Academy, Mumbai

----- Original Message -----
From: "Bathula Raghuram (Mumbai - PIPING)" <R.Bathula@ticb.com>
Date: Wednesday, March 19, 2008 3:01 pm
Subject: [MW:665] RE: 664] Chemical cleaning for Marine boilers
To: materials-welding@googlegroups.com

> Is it new equipment or used one? What is the purpose of chemical
> cleaning for your equipment? (I mean incase of used equipment what
> typeof scaling involved, like water scales, iron oxide, and any other
> corrosion product/loose oxides?)
>
>
>
> The principle of cleaning basically consists of circulating the
> desiredchemicals through the Cooling Water Circuit by dosing them
> in the
> chemical dosing pot and maintaining circulation for a period
> sufficientto remove all the deposits.
>
>
>
> Sriram!
>
> Did u remember what we have done in BPB offshore for heat exchangers?
> What ever I could recollect I am putting down hereunder!
>
>
>
> The procedure is elaborated as follows:-
>
>
> CLEANING OF SHELL SIDE
>
>
>
>
> 1)                  Dosing of 2% Teepol B-300 into the Chemical Dosing
> Pot though which it is fed into the system.
>
>
>
> 2)                  The solution is circulated in the system for a
> period of 3-4 days during which KMnO4 value is tested.
>
>
>
> 3)                  On the completion of 4 days of circulation the
> system is to be progressively drained with simultaneous filling of
> freshwater.
>
>
>
>
> CLEANING OF TUBE SIDE
>
>
>
>
> This cleaning has been carried out by forming a closed circuit
> cleaningloop consisting of temporary piping and Recirculation Tank.
>
>
>
> 1)                  Filled and flushed the entire system with fresh
> water till clear.
>
>
>
> 2)                  2% Teepol B-300 and 0.5% KOH added based on the
> system volume into the circulation tank. This solution is then pumped
> into the exchanger where it is allowed to soak for a period of 12 hrs.
>
>
>
> 3)                  The same solution is then circulated for a
> period of
> 8 hrs, after which it is drained and flushed till the PH is equal to
> that of the flushing water.
>
>
>
> You can get the elaborated procedure from the chemical cleaning
> vendor,but remember it will vary for type of sediments what u
> needs to clean
> finally.
>
>
>
>
>
> ________________________________
>
> From: materials-welding@googlegroups.com
> [mailto:materials-welding@googlegroups.com] On Behalf Of jagannathan
> Sriram
> Sent: Wednesday, March 19, 2008 10:29 AM
> To: materials-welding@googlegroups.com
> Subject: [MW:664] Chemical cleaning for Marine boilers
>
>
>
>
> Hi friends
>
>
>
> If any one has procedure for chemical cleaning of marine boilers
> pleaseforward to me.
>
>
>
> Thanks
>
> Sriram.
>
>
>
>
> >
>
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