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RE: [MW:22656] Max. temp. attainable by CS tubes to avoid creep rupture

By Materials & Welding
For a short term exposure the specified temperature will not cause creep
except overheating. In general the covection section tubes are designed
for no flow condition for certain hours. Since your are measuring the
skin temperature the tube inner wall temperature will be less than skin
temperature.
regards,
Gopalsankar
On 2014-09-30 07:45, pgoswami wrote:
> Hi Jignesh and Dr Dilintas,
>
> A short note on this scenario, from Utility Operators point of view.
> C.S will be pushed well above the upper limit and cause overheating of
> SA 106 GrB. Reason excessively higher temperature(well above design
> limits) plus dry(no flow condition).
>
> It would advisable to switch to Cr-Mo steel for better design, and
> avoid premature failure. FEA is good for all other scenario, but Creep
> is totally unpredictable.
>
> Thanks.
>
> Pradip Goswami, P.Eng,IWE
> Welding & Metallurgical Specialist
> Ontario, Canada
> pgoswami@quickclic.net
> pradip.goswami@gmail.com
> http://ca.linkedin.com/pub/pradip-goswami/5/985/299 [1]
>
> -------------------------
> FROM: materials-welding@googlegroups.com
> [mailto:materials-welding@googlegroups.com] ON BEHALF OF
> george.dilintas@gr.bureauveritas.com
> SENT: Tuesday, September 30, 2014 4:29 AM
> TO: materials-welding@googlegroups.com
> SUBJECT: Re: [MW:22020] Max. temp. attainable by CS tubes to avoid
> creep rupture
>
> 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
>
> best regards
>
> Dr. Georgios Dilintas
>
> Authorized Nuclear Inspector
> Authorized Inspector Supervisor
>
> I&F REGIONAL TECHNICAL MANAGER
> BUREAU VERITAS HELLAS
>
> Tel: +30 210 40 63 113/4
> Fax: +30 210 40 63 118
> Cell: +30 69 44 64 62 04
> _(See attached file: Dilintas_George.vcf)_
>
> 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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