Re: TRUNION TEMPERATURES

Dear Kaustubh

Thanks for that. I would guess SIF stands for stress intensification factor. When the bend cools, the stress will decreaseand then be reversed in the sense of bending. So if the pipe tends to bend upwards when heated, it will tend to bend downwards when cooled. The SIF will still apply but in the reverse direction, I guess. I assume C II accounts for this. It does suggest to me however, that in complex piping, say around pumps, where there are more bends, reducers, valves etc, than there is straight pipe, then CII may produce less than ideal results as it relies on "factors" rather than calculation. Am I wrong?

Cheers

Steve Mck
----- Original Message -----
From: "KAUSTUBH JOSHI" <kvj@epc.ltindia.com> To: <PipingDesign@yahoogroups.com> Sent: Saturday, April 20, 2002 12:56 AM
Subject: Re: [PipingDesign] TRUNION TEMPERATURES

> Dear Steve,
>
> As a non stress(ed) engineer I have a question for the more highly
stressed
> guys.Say we have a 1.5D bend at exactly 90 degrees cold. As it warms, the
> angle will decrease because there is more metal on the outside of the bend
> than the inside. Does C2 allow for this?
>
>
> Ans:
> CAESAR-II is based on the principle of "Guided Cantilever Method", in
which the end rotations are not allowed. Hence, in CAESAR-II the inward bending of a bend due to increase in thermal expansion, is not taken into consideration. The solver takes into consideration of flexibility factor to calculate end displacements and sif for calculation of bending stress.
>
> Similarly, it is worth noting:
> when we have increase in temperature the bend bends inward and due to
warping of fibres, we have a SIF assiciated with the bend. Does this mean that when the system is having negative increase in temperature due to opening of bend we should have Stress RELEAVING factor ?
>
> Regards,
> Kaustubh
>
>
>
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Received on Fri Apr 19 09:44:00 2002