The steam must be exhausted to atmosphere outside the turbine hall. Since, steam blowing is not a normal operation procedure, extreme care should be taken to ensure safely of personal and equipment. The area should be cordoned off and notice should be displayed prominently. For thermal expansion of the pipe, proper allowances must be given. First steam blow is given at a lower mass flow of steam and the pipe lines are to be surveyed for proper expansion and supports.
Ensure that all permanent hangers of various pipe lines including main steam line is erected as per drawing and the values set accordingly to the design values also ensure that locking of hangers are removed. Ensure that remote operation of startup valve, main steam stop valve and its bypass valve is possible. Ensure that flow nozzles, control valves non return valve flaps are not erected before steam blowing.
Spool pieces may be erected at its places wherever applicable. Ensure that insulation of temporary and permanent piping is completed as per schedule before starting the steam blowing. The steam generating unit is started in normal manner following a cold start-up procedure. All recommendation with reference to drains, vents, firing system etc should be followed. The boiler should be brought-up slowly and the expansion movement should be monitored.
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