Consider this,
If you use Teflon slides, the weight of steel can be reduced. The gains
resulting from using reduced quantity of steel, will it not out weigh the cost
of providing the Teflon slides?
It is sometimes done this way, on concrete pipe racks, steel rods are placed in
the transverse direction to support the pipes. This will provide a point contact
between the pipe and the steel rod.
The friction factor of 0.3 is for normal steel to steel. Sliding friction is not
dependent on area of contact. Therefore how the above is effective, perhaps
somebody can tell me. It is my guess that it may be because of this. Steel after
rusting, if the area of contact is more will stick more together thus requiring
a large force for sliding to begin than if it were with a rod.
Sajit
-----Original Message-----
From: k1_m_a [mailto:mashayekh-k@iritec.com]
Sent: Tuesday, November 11, 2003 10:58 AM
To: <a href="/group/PipingDesign/post?postID=mvMh_XWF18YQmJWIn03jg_KuLtBd8LrsE2-k-eXlLMVrQKuWBmmEGfZBv8iBtjW1DVleEJFY4LeM4uScip80FT6uk5U">PipingDesign@yahoogroups.com</a>
Subject: [Man.Distr]Re: [PipingDesign] Piping supports contact surface friction
factor
Dear Sajit,
The history of the job is that, considering the expences,
construction concerns and the number of supports we are obliged to
use simple pipe supprts made of pipes. And because of this Teflon
Sliders can not be used.
And that friction factor of 0.3 has been considered based on
Petroleum Standards in my country. But now I am looking for some
other standards and reliable references to based on them lower
friction factor for pipe to pipe contact can be cosidered.
That's all.
Regards,
Keivan
- In PipingDesign@yahoogroups.com, "Sajit Viswan" <sviswan@t...>
wrote:
> May I suggest,
>
> The person who raises the question should also say what answers on
the question that he has already found (Including previous postings
on this list), so that the person who answers does not have to start
from zero.
>
> For a start, have you considered supports with teflon slides?
>
> Sajit
>
> -----Original Message-----
> From: k1_m_a [mailto:mashayekh-k@i...]
> Sent: Monday, November 10, 2003 6:45 PM
> To: <a href="/group/PipingDesign/post?postID=mvMh_XWF18YQmJWIn03jg_KuLtBd8LrsE2-k-eXlLMVrQKuWBmmEGfZBv8iBtjW1DVleEJFY4LeM4uScip80FT6uk5U">PipingDesign@yahoogroups.com</a>
> Subject: [Man.Distr][PipingDesign] Piping supports contact surface
friction factor
>
>
> Dear members,
>
> Thank you in advance for your kind attention.
>
> In the Gas Treating Plant we are working on, we have faced this
problem that
> for Flare lines outside the battery limits, the piping supports
have become
> very huge.
> Piping load is big, elevation is high and the supports shall be of
pipes. But
> considering 0.3 friction factor for pipe to pipe, the horizontal
load will be
> so big that will tend to a huge supprt structure.
>
> Is there any reference standard or approved engineering practice to
stick to
> that to consider lower friction factor for pipe to pipe surface
contact?
>
> Best regards,
>
> Keivan Mashayekh
>
>
>
>
>
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Received on Tue Nov 11 04:20:00 2003