Re: [MW:22020] Max. temp. attainable by CS tubes to avoid creep rupture

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The max temp. for SA-106 GrB is 800 deg F (as indicated by ASME B31.1).
Your temperature is close to this limit.
However, creep is not only a function of time. It is a function also of the load (pressure or other).
So I would suggest that you carry a static calculation and you compare the resulting stress with the allowable stress at 800 degF (for SA-106GrB, this is 10,8 ksi).
If you are below you have not to worry about.
Otherwise you will need to perform FEA with non linear Finite Elements simulating creep

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Jignesh Desai ---30/09/2014 10:52:54---Design Code : ASME Sec I, API 560 & API 530 Service: Non Corrosive.

From: Jignesh Desai <jignesh.desai.met@gmail.com>
To: materials-welding@googlegroups.com
Date: 30/09/2014 10:52
Subject: [MW:22019] Max. temp. attainable by CS tubes to avoid creep rupture
Sent by: materials-welding@googlegroups.com

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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