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Anchor force
3

Anchor force

Anchor force

(OP)
Could anyone advise me the way to desin or get information to calculate anchor forces from pipelines to support eg. piperack.

Thanks

RE: Anchor force


Buy a copy of a stress analysis package.

You can hand calculate it easily if the geometry is simple.
I think www.coade.com has a book that covers simple hand calcs.  The old ITT-grinnel manual also has some hand methods.

-Tom Meier

RE: Anchor force

3
Anchor forces are typically provided by the pipe stress engineer who does a flexibility analysis, usually by computer, on the system. Flexibility analysis considers weight, thermal, and occasional (i.e. wind, seismic) loads. It would be difficult to engineer a pipe rack without knowing what the reactions to these loads are. The question that has to be asked is why is there no pipe stress analysis being done.

RE: Anchor force

(OP)
pipesnpumps, steve1
     Lot of thanks for your help.
     pipesnpumps---could you tell me more detail of ITT-grinnel manual, how can i get this informatiion.
     I'm not familiar with any pipe textbooks. What i want is to roughly estimate this anchor forces to my piperacks for preliminary design( not detail design). Any pipe engineers in my firm could not go deep into stress analysis at this preliminary design.
     In case you have any idea for approximate forces of these will be very thanks.

-Gtoyo

RE: Anchor force

Gtoyo

Are you looking for anchor forces or support reactions? Piping analysis is based on a pipe that runs from an anchor to an anchor with supports in between. It is relatively easy to determine the support reactions, not quite so easy to determine anchor forces.

If you are looking for preliminary support reactions then those can be calculated based on the tributary length of the pipe between supports. You will need to know the pipe diameters, schedules, insulation (if any)and contents (if carrying a liquid). Dead loads can be expressed in pounds per foot. Lateral (occassional) loads such as wind and seismic are based on the exposed area (diameter X length) for wind, and the mass of the pipe plus contents for seismic. Ask your pipe stress engineers if thermal loading will be a problem. Depending upon thermal conditions the pipe may or may not be laterally supported at each rack.

If you are looking for a reference book I suggest:

Piping and Pipe Support Systems
Design and Engineering
Smith & Van Laan
McGraw Hill
ISBN 0-07-058931-3

RE: Anchor force

(OP)
steve1
        I'm looking for anchor forces come from thermal operation, I've some estimating formula for preliminary design( as I stated before not detail design) such as in case of equal-length-tanget-U-loop ;
      Px = Kx . C . I / U2 (kg)
      Sb = Kb . C . D / U  (kg/cm2)

     I'd thank if somebody can give me copy of table for  Kx , Kb and C that depending type of piping.

     Thanks.

RE: Anchor force

Gtoyo

The information that you are seeking is in the aformentioned reference book (English units only) in Table 5.6. I can fax (U.S. only) or send via snail mail anywhere in the world.

Steve

RE: Anchor force

(OP)
Steve1
       Thanks for your kindness , my add :lsurakiat@hotmail.com

       

RE: Anchor force

Gtoyo

I sent the info via email today. Hope this helps.

Steve1

RE: Anchor force


Steve
 I'm looking for same information (rough calculation for forcs on anchors caused by thermal expansion...)

 It will be of great help if you mail me the same info.

 My e mail is shahin@warmseas.com

 Shahin71

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