Tuesday, September 30, 2014

[MW:22019] Max. temp. attainable by CS tubes to avoid creep rupture

Design Code : ASME Sec I, API 560 & API 530
Service: Non Corrosive.


We have CS tubes in the convection section (BFW service) of furnace and we are planning to operate during the emergency shut down (plant black out) for short duration of about an hour at higher temperature then the design temp.  (425° C). 
At this short duration of time the water tubes is going to see the no BFW flow condition (DRY).

Query: What is the max. temperature attainable (intermittent - 01 hour) by CS tubes (to avoid creep rupture). How much the temperature above the design temperature (425° C) can the CS tube be pushed for this short operation of time (01 hour)?

Regds/Jignesh

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