| Water cheap&plentiful internal surfaces are kept free from deposits, water can be operated at high temperatures. High specific heat capacity. But leakage can cause oil contamination. Additional pumps and coolers needed. Oil easy supply no contamination problems lower thermal conductivity reduces steep temp gradient. but- possibility of oxidation & coking. |
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).
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