Recent content by gwkwong

I wonder if an ultimate skin friction shall be used for the determination of the minimum pile embeddment against frost heave. I have seen some soil reports suggest to use factored ultimate resistance skin friction to determine the min. pile embeddment. In this case, a factor of 0.3 will be...

thanks very much, I wonder if there is a good book discussing vibration spectrum for recip compressor.

here is the spectra for the comp and cylinderhttp://files.engineering.com/getfile.aspx?folder=40fb362e-8c24-4fdd-8bf1-9f4f0cad1a3e&file=comp_&_cylinder_spectra.pdf

The unit is a recip compressor. I have attached the spectra for the comp/cylinder and the I beam from the vibration monitoring. The spectra for the I-beam shows vibrations at high order of operating frequencies which I think is related to pulsation. Any idea will help...

My Client has a recip compressor unit that is experiencing vibration issue. The overall vibration magnitude is about 0.5 ips at 1000 rpm at the distance piece support I beam. However, the manufacturer review and conclude that most of the vibration is beyond 2X operating frequency, which means it...

Does anyone know what would be the vibration induced by , say, pile driving or dirt compaction equipment, on the underground pipeline. I once was told about a certain shear wave velocity values or something which I forgot.

I wonder where I could find the vibration criteria for centrifugal pump foundation.

After so many months, I found out that they have torque values when the machine shut down. But I believe it is not the torsional study for the shaft.

I am working on the foundation design for Flowserve DMX centrifugal pumps. I wonder if anyone knows how to calculate the unbalanced forces and couples for these pumps. I have been waiting for the vendor to answer my question but so far I haven't heard back from them. But I would like to have...

I just wonder what is means by "band of liquid". To determine the anchorage requirement, shall we assume that tha tank is empty. Where is this "band" of liquid comes from?

I got it. Very useful and clear thanks to all.

Snorgy, I spent lots of time researching and find out yes they could pressure test up to or may even exceed 100%. But in Alberta Pipeline Act (http://www.qp.alberta.ca/574.cfm?page=2005_091.cfm&leg_type=Regs&isbncln=9780779743919), section 2 part 16 - I think they limited the design stress level...

Yes I switch my topic because I was dealing with steel pipe as well. I agree that the hoop stress to be calculated based on the design pressure and then check with the SMYSxFxTxLxJ. But my project manager who has been in the pipeline told me that CSA allow the hoop stress compare to yield, which...

Thanks so much for all the help. I wonder if anyone is familiar with CSA Z662. In pressure checking, should the hoop stress be compared to the yield strength of the material or the factored yield strength (design factor, location factor , temperature factor.....)

forgot to mention that it is under 120 psi pressure