measuring equipment, tools and tackles were required for execution. First respondent engaged a sub contractor M/s.S.V.Engineering. It deployed around twenty workmen including fitters, riggers, welders, fabricators etc. The set up was completed by May 10, 2016 and operation of chemical cleaning was started and completed on June 3, 2016. After seven days of completion of chemical cleaning temporary piping set up was dismantled. First respondent started mobilising for the work of steam blowing during this period, which included preliminary engineering, preparation of drawings, lay out, equipment and planning to commence steam blowing. They ordered four numbers of custom built motor operated valves and bypass valves on M/s.Athena Engineers, Chennai, with advance payment. Athena returned advance later as they did not supply to TES. Chemical cleaning of main boiler of Unit 1 was completed on June 3, 2016. On June 6, 2016, the orders of first respondent were unilaterally cancelled for the unexecuted portion. First respondent represented against the cancellation order vide letter reference TES/BGR/2016 dated 09.06.2016. Subsequently, orders were reinstated partially for chemical cleaning only. After two months, first respondent was compelled to surrender the order for MOVs made on