Let's know about the Different boiler water test and Its procedure

1. Phenopthelin Test (P Alkalinity Test):

1. Take 100 ml of boiler water sample.
2. Add 10 drops of phenopthelin.
3. Color will turns to pink.
4. Now add N/50 sulfuric acid, till color will varnish.
5. The quantity of sulfuric acid will indicate the phenopthelin alkalinity of boiler water.

Result : Drops of sulfuric acid *10 = P alkalinity in PPM.

2. Total Alkalinity Test :

1. With the above sample add 10 drops of methyl orange.
2. Color will turns to orange.
3. Now add sulphuric acid, till color change to pink.

Result : No. of drops of sulphuric acid X 10 = Total alkalinity in PPM.

Note : This test is use to test hydroxide plus carbonate and bicarbonate in boiler water.

3 . Chloride Test : 

1. Sample after P-alkalinity test to be used. 
2. Add 10 drops of potassium chromate.
3. Color changes to yellow.
4. Add N/35 silver nitrate(Agno3), till color changes to brick red.

Result : Quantity of silver nitrate *10 = Chloride present in water in PPM.

4 . Phosphate Test :

1. Take 25 ml of filtered boiler water sample. 
2. Add 25 ml of reagent molybdate. 
3. Then add one small spoon of stannous chloride color will change to blue.

Result - Use comparator to check the phosphate. 

5 . P-H Test :  

1. It is check by using P-H paper 
2. Dip the PH paper. 
3. Use the color comparator to check the P-H. 

6 . Hardness Test : 

1. Can be carried out by means of conductivity meter or we can use standard soap solution. 
2. Take boiler water in a beaker. 
3. Add soap solution and stir it for some time. 

Result : More the foam formed less is the hardness in boiler water. 

7 . Conductivity Test : 

1. Higher the conductivity, higher the hardness.
2. So with the harness test you have the general idea about the conductivity. 

The correct value we have to maintain In boiler water are:

• P alkalinity = 150 PPM. 

• T alkalinity = 300 PPM. 

• Chloride = Should not be more than 300 PPM.

• Phosphate = 40 -60 PPM.

• Conductivity = 3000 us/cm for High pressure boiler 400 us/cm.

• PH = 10-11.