Procedures for wet lay-up of boilers

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important proper action is taken before the vessel is laid up to avoid

corrosion created by low pH and/or oxygen pitting in the water.

The lay up procedure has to be started a few days before the boiler system

will be stopped.

1.  The boiler treatment levels should be kept as follow: p-alkalinity 200

ppm and chloride readings must be kept low as possible.

2.  Regular blow downs must be given to reduce the potential sludge

deposits at a minimum:

•  Surface blow down to remove possible oil contaminants

•  Bottom blow down to remove potential sludge

3.  Oxygen Scavenger Plus should be dosed the last 3 days 1,5 ltr/day

to reduce the oxygen content.

4.  One hour before the boiler will be stopped a final dosage must be

given with 1 ltr/Oxygen Scavenger Plus/ton (calculated the full

capacity of the boiler)

5.  The boiler must be filled up complete with a water “head” created by

a hose via the air vent connected to a drum above the boiler.

6.  The water level in the drum should be checked regular to be sure

that there would be no oxygen intake.

7.  Maintain boiler water at pH 9 by dosing with Condensate Control.

To return the boiler in service the water level must reduced till normal

working level and lite-off as per boiler manufacturer instructions