Why would you replace it with a more flexible element? I think he's referring to a concrete thrust block or something similar, which should help lock the pipe in to the soil and spread the thrust loads out into the soil.
My company has been using thrust blocks for blow down stacks on natural gas transmission pipelines for probably 60 years. I'm not convinced they're really needed as the soil would probably restrain the blow down stacks just fine, but they've been used for a long time.
yes mac man,, i am referring to concrete block to restrain movement,, how can i model that in auto pipe.
I believe after virtual anchor length, pipe is fully restraint,, so in order to counterbalance the movement in unrestraint portion, anchor has to be placed here, so hw can i model that,,,
A thrust block is not an anchor block. A thrust block is a foundation that supports the pipeline, blowdown stack, valve weights and the live loads superimposed on those elements generated by the act of releasing the pressurized gas from the pipeline.
I don't know Autopipe but we have 2 ways for modeling anchor/thrust blocks in CAESAR II(as I know):
1- use of anchor with stiffness at anchor/thrust blocks
2- changing property of the soil near anchor/thrust blocks.
So do you increase the stiffness of the soil or insert an anchor with stiffness proportional to the area increase that the thrust block gives you vs. the pipe itself?
Of course. According to thrust/anchor block area and soil stiffness you can estimate thrust/anchor block stiffness and then use this stiffness in the software at the block point.
Hi all,
we are designing a natural gas pipeline, of 24'' diameter. My question is, when an achor bolt is required. The pipeline that we are designing is an underground carbon steel pipe, which in some cases has over 40% slope! Is there any rule of thumb or good engineering practice for anchoring the pipeline if its slope is over one specific percentage?
tsofa, Please post your own question rather than tacking on to this old one that has nothing to do with yours. A lot of people won't bother reading it otherwise because they believe the issue's already been answered.
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