This is where engineering judgement comes in play.
When you think friction forces (takes place during thermal transient
and seismic condition) would effect your piping system and the
equipment nozzles where the pipe connects, then you must included
friction in the analysis. Otherwise, as rule of thumb, friction
coefficient is set to zero. Your consultancy & EPC company
suggestions are correct.
On very long straight pipe run you may want to consider friction when
the pipe ends at an equipment nozzle. Watch where you place your
anchors and expansion loops.
- In PipingDesign@yahoogroups.com, "KAUSTUBH JOSHI" <kvj@e...>
wrote:
> Hello All,
>
> A few days ago, a world known consultancy & EPC company suggested
us the following:
>
> 1) While performing the static analysis (flexibility analysis) of
the piping systems, it is not necessary to consider the friction
forces. The friction forces are short time generated loads, and act
on the system during the thermal expansion. The friction forces
diappears after the thermal movement of the piping. That's why
friction should be excluded from static piping stress analysis
(flexibility analysis).
>
> 2) There will be no friction at the guide side surfaces or the
limit stops. The friction will be there only for the resting supports.
>
> What are your views on these?
>
> Regards,
>
> Kaustubh
Received on Mon Apr 21 11:02:00 2003