Why boiler water tests onboard ?
Lot of people misunderstand boiler water tests and boiler water treatment. Boiler water tests are tests to find a particular chemical compound or excess chemical compound in the boiler water.If you do the boiler water test correctly and regularly you can find excess compound or impurities in the boiler water and prevent following factors,
>Prevent corrosion in the boiler feed system by maintaining the boiler water's alkaline condition.
>Remove dissolved gases such as oxygen from water.
>Control sludge formation which prevent carry over with the steam.
>Determine the amount of impurities by which we can select appropriate treatment.
>Exercise careful control over boiler treatment chemicals.
>Maintain and provide residual reserve of chemicals.
>Improve efficiency, thus increasing boiler life and service period of boilers.
>For economical operation of boiler.
Boiler water tests
- Onboard boiler water tests are carried out by professional water analysis kits provided by recognised companies such as Unitor And Drew .
- The procedure and method for doing these tests are different according to the these companies but the final result is to find particular chemical content.
Collecting Sample water
>The first stage in the boiler water testing is to collect feed water sample from the boiler concerned.
>Always take water sample from the same place.
>test samples should be cooled to 25 degree Celsius with the help of sample cooler. This is done in order to prevent flashing which concentrates the sample.
>If the sample is colored or turbid, filter paper should be used before testing.If the sample still remains turbid even after first filtration, the same filter paper should be used again as it will become more retentive after the second filtration.
>Allow the water to flow from the sample cock before taking the sample for testing to ensure the line is clear of sediment>An ideal location in the boiler to draw sample is from the Salinometer Valve, after passing thru a sample cooler making sure that the sample line is flushed through and sample bottle rinse thoroughly.
> Let the water over flow from the sample bottle to prevent air being trapped inside the bottle and keeping the bottle air tight for testing.
Different boiler water tests and its purpose
>Hydrate Alkalinity - For testing the presence of hydrates
>Condensate PH - Measuring the acidity or alkalinity of the water.
>Chloride ppm CI Test- measure the chlorine content or sea water presents.
>Phosphate - For testing the presence of phosphate compounds. It is important to maintain minimum of 10 ppm of phosphate.
>Deha/Oxygen test -For testing oxygen and Chemical content
>Neutralized Conductivity - For testing the presence of ferrous ions and metal contents.
> Feed Water Hardness - For testing the presence of carbonate compounds.
For exam point of view this much is enough.Test procedures are not that much important.
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