The steam turbine unit has a high oxygen content

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In cases of high oxygen content, the turbine department in the equipment facility conducted a thorough inspection of the drain system. The findings are as follows: 1. The mechanical seal water for the heat network drain pumps in Unit 1 is a closed-loop system, and the volume of this water affects the oxygen content in the heat network drains; together with the operators, adjustments were made to the mechanical seal water for the three heat network drain pumps. The inlet valve for the mechanical seal water of the backup heat network drain pump is fully closed, and the seal water valve of the operating drain pump is turned down. 2. An inspection was carried out on the insulation covering the upper part of the heat network steam trap tank. 2.1 No leakage was found during the inspection of the manhole in the heat network drain tank. 2.2、There are two air release pipelines on the west side of the upper part of the heat network drain tank; inspections have shown no internal leakage at the flanges and the valves are closed. I need help – which other parts need to be inspected by the sister unit?