PIPE SUPPORT-COLUMN ORIENTATION

[tmgczb]

In my opinion,Type 1 shall be used to make full use of column stiffness of bending resistance. But Type-2 is more widely used in many projects.
Kindly please experts here explain and help me build a concept.

 

[HTURKAK]

I am not sure why TYPE 1 SHALL BE USED !! . Both can be used acc. to bending moment developing.. In most cases , type 2 ( the one at right of the picture ) is used.

 

[MJCronin]

These supports are sometimes called "T-poles" or "T-posts" ... they are typically tall and slender and used when there is no alternative

Sometimes a pipe is used for the column member, which has equal stiffness in all directions

Additionaly, you should note that these t-pole suports are NOT supposed to be used where the piping system will develop axial loads ! (e.g. where the pipe needs an anchor at that point)

The answer to your question is:

-- "Type 1 offers "column bending stiffness" along the axis of the single supported pipe or pipes, where it is not necessary or desired,"

-- "Type 2 offers "column bending stiffness" orthogonal to the axis of the supported pipe which is desired and is therefore MORE COMMON"

I am not comfortable with your awkward third world terminology "column bending stiffness" .... but used it anyway in my response

If you were to develop a composite structural model with a series of supported piping systems and REALISTIC values for "C", then the answer would be obvious

https://www.eng-tips.com/viewthread.cfm?qid=195028

MJCronin
Sr. Process Engineer

 

[tmgczb]

But forces in horizontal direction are mainly along axis of pipes.

 

[MJCronin]

A better location for this question might be in the "Piping, pipelines and Fluid Mechanics" forum

MJCronin
Sr. Process Engineer

 

[tmgczb]

Indeed.

 

[le99]

For everything that concerns the static gravity load, either type can be used. But once lateral loads and dynamic effects get involved, the choice may not be that clear.

 

[1503-44]

Please do not make double posts.

A black swan to a turkey is a white swan to the butcher ... and to Boeing.

 

[dhengr]

Tmgczb:
The pros and cons, as I see them..., The right hand detail, Type 2, is the preferred column/post orientation in most cases, for the following reasons:

Along the length of the pipes, you will at least have forces and movement due to thermal expansion and contraction of the pipes. A degree or two of column top movement/lean can be tolerated and designed for over a number of support bays. Then every so often, every so many bays, you might x-brace a bay, along the axis of the pipes, to control and contain this movement. Slip joints or saddles might come into play in this longitudinal loading and movement too. And, you may have some support points which are fixed in terms of these longitudinal loadings and movements, for various reasons. And, the weak axis bending strength of the columns lends itself to the above considerations.

On the other hand, the strong axis bending of the columns and their bases/foundations is the primary means (only means) of supporting lateral loads (wind, EQs, etc.) in the direction perpendicular to the pipeline, not much sharing or redistribution btwn. columns here. These are often the greater lateral loads at the tops of the columns, and the columns are more difficult to brace (guy wires, etc.), in this perpendicular direction. These guy wires end up outside the pipeline right-of-way, or out in a travel path, etc. The basic column strength vs. gravity load only, is pretty much the same for either orientation, but then you must combine this with the column bending due to the various lateral loads in each direction.

 

[tmgczb]

There is no X brace nor tie beams between any 2 posts. All T posts are isolated.

 

[1503-44]

It is possible that pipe friction will supply some limited lateral and axial sway restraint.

A black swan to a turkey is a white swan to the butcher ... and to Boeing.