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Max Allowable Working Temperature Limits

11/22/2010 7:17 AM

Can any person guide me on the following qurey : We have to use Carbon Steel material under following conditions : NORMAL Operation 374 Deg SHORT term Event ( lasting less than 15 min Total < 80h /year) 502 Deg Single Event ( 5 min max. ) 510 Deg ----------------------------------------------------------------------- is this advisable to use Carbon Steel or even more, change to P11 / P22 considering the Short term Design Condition ?? Warm regards, Deepankar
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PWSlack
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#1

Re: Max Allowable Working Temperature Limits

11/22/2010 9:53 AM

For what purpose - landing pads on the Lunar Excursion Module, perhaps?

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MJCronin
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#2

Re: Max Allowable Working Temperature Limits

11/22/2010 2:44 PM

Suggest that you review one of the piping codes (ASME B31.1 B31.3)

As I recall, these codes permit carbon steel usage to 775F continuous duty with very brief excursions to 800F+ ( 2% of the time)

Carbon steel degrades above 800F.

If hydrogen is present, an even lower maximum operating temperature is recommended

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Tornado
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#3

Re: Max Allowable Working Temperature Limits

11/22/2010 7:33 PM

See the pressure derating factors for elevated temperatures. If high strength is not required at the same time as temperature, this may be okay. (Sorry I don't have a Code copy handy.)

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