Cleaning Options for Feedwater Heater Steam Supply Line 1

[MAPower]

I was looking to see what reccomendations/options anyone had on cleaning a new steam supply for a 1st point feedwater heater after construction. I have been looking at some startup documents, but no good information is available for feedwater supply lines (lots on main steam line "steam blows"). Would a basic flush or alkaline cleaning be sufficient? Some information on the system:

- system contains 5x feedwater heaters, deaerator, and condensate polisher
- coal fired unit
- this will be a secondary mainsteam supply to the 1st point feedwater heater

Thanks for the help.

 

[kenvlach]

Depends upon initial rust, weld scale, lubricants, dirt, etc. present. Maybe follow new boiler procedures: a hot, slightly buffered citric acid cleaner at pH 3.8-4 to remove dirt & rust/scale, followed by passivation at pH 9.

http://www.vecom.nl/english/documentation/tb/TB-2005-17-eng.pdf

http://www.angelfire.com/mt/chemicalcleaning/webboiler.html

 

[rmw]

What do you mean 'secondary mainsteam supply to first point heater'? Is this a supercritical unit? what is the "primary" mainsteam supply to the heater? Is it cold reheat? If so what are you cleaning the cold reheat lines with?

rmw