Take sample after P-alkalinity so that all carbonates and hydroxides are delt with and chlorides can be tested alone. [add 2ml of sulphuric acid(to make sample acidic to speed up reaction) + 2ml of potassium chromate indicator and titrate with 35.5 silver nitrate until a brown colour appears. ppm of cl= ml of silver nitrate used * 10. silver nitrate has more affinity to chlorides than to chromates. ( max=50ppm)
Since very small needle lift is obtained in the test equipment result in an unequal pressure distribution in the cut off shaft resulting in a hard contact in a small area along with high frequency oscillations, low lubricity of test oil will increase the chance of seizure. Full lift and high lubricity of heavy oil eliminates this risk of seizure during normal operation.( Always open and clean slide type valves before testing as cold sticky heavy oil along with small clearances can cause restriction in the movement of the spindle).
Comments