1. HP BY PASS WARM UP METHODS: (A) Equalising line with orifice (B) Drain line at upstream side of valve connected to downstream side of Main Steam line strainers

2. Method (A): This method results in certain amount of loss of heat energy and increases HP By Pass downstream temperature and some times causes problems in proving emergency operation of HP By Pass. Method (B): This method is suitable for short HP By Pass upstream line

3. SUGGESTIONS 1) To effectively warm up Main Steam line it is preferable to take tap off for HP By Pass near to strainer or after the strainer similar to LP By Pass 2) The lines are to be taken to the higher elevation. The horizontal portion of the line to be kept as minimum as possible to prevent condensate collection in the upstream side of HP By Pass

4. SUGGESTIONS Contd…. 3) It is preferable to have a drain pot at the downstream side of individual Hp By Pass with provision to drain condensate through level switches 4) Water collection in the downstream side orifice plate is expected at Simhadri since the orifice dia. is more than the pipe size.Such deviations are to be prevented

5. CRH HP BYPASS WARMUP SCHEME -1 MSL FE TE 60.3 *12.5 (STUB AT BOTTOM OF THE PIPE) HP BP VAV LOCK OPEN TO MAIN STEAM STRAINER DOWN STREAM 200 MM Nb 50 LINE DIRT TRAP

6. MSL FE TEHP BP VAV LOCK OPEN TO TURBINE FLASH TANK CRH 200 MM Nb 50 LINE 60.3 *12.5 (STUB AT BOTTOM OF THE PIPE) HP BYPASS WARMUP SCHEME -2 10M min.