Recent content by gbratis

Thanks everybody, BibInch your info was most explainable. The only thing I dont seem to understand is the ? parameter in the formula ((?/4)^0.5*D +(?/4)^0.5* P*D^2/2/t/E-(?/4)^0.5*2*t )^2. Which is the source of this formula? Do we have to consider the limitation of the 0,25 barg/min or is it an...

Dear Biginch, Thanks for your fast reply. I was informed that the pipeline will be filled with water and after that the PD pump will take action.My superior needs my evaluation on the correct PD pump that incorporates the pressure rise rate of the 0,25 barg/min, noting that from his experience...

Sorry everybody, I meant HYDROTESTING!!!!!!

Hi folks, Here's a good one for you. We are trying to size a pump in order to perform a hydraulic test in a pipeline system. We have the following data : 1) Pipe size - 18 " (SA 106 Gr.b) 2) Straight Pipe length - 5.000 mt 3) Hydraulic test pressure - 41,25 Barg 4) Fluid - Potable Water 5)...

Thanks everybody, Jte to clarify things up I'm adding some remarks on your original post : I presume you are at least talking about a vessel whose design temperature is ambient (No) and that the "or 2/3 yield" part of the allowable stress basis doesn't apply (We are not performing test at known...

Hi folks You noted once that I shouldn't use API 5L piping for an ASME VIII div.1 vessel. Even though I dont seem to understand why, since you can use an A 106 Gr.B PIPE!, now I'm in the position of no turning back where I've used an API 5L X 65 pipe to lower the calculated thickness of the...

Hi everybody, This is my first thread in this mechanical engineering division so my question is simple.Often we are asked to size shell-u tube heat exchangers and as far I know the most critical parameter is defining the overall heat transfer coefficient. Different approaches-values, result to...

Here's a good one for you folks. Is it permissible to weld a SA 234 Gr. WPB cap to a API 5L X 65 pipe? Our quality manager stated that if the calculated wall thickness is acceptable, they can be welded using of course a new WPS for this weld. Is this clause valid or I have to proceed with a gr...

Dear Biginch, The kicker line in our example is a branch from the main pipeline. The most logic thing is that the flow rate is the same as the pipeline's, that is 1400 cm/hr.Do we need to throttle the flow first? As for the medium, it is either gasoil or gasoline.

Dear ZDAS, Thank you for your valuable post. If the medium is gasoline what does your program picks?

Hi everybody, First of all I would like to thank each and everyone of you for your concern on my queries. You quys are the best and this forum rules. I'm quite new in the area of API 650 tank design and engineering, so I would appreciate some guidelines and technical directions on the above...

Thanks EGT01 you hit the jackpot!!!!!!!

Could somebody recommend a reliable piping thermal insulation thickness calculator? (Freeware or an excel will be highly appreciated!) Regards George

Hi lifesaviours, I would like you to advise me on the applicable rise rate (velocity) of an internal Floating roof when filling a tank. A certain manufacturer replied as follows : " There is no standard as such for the rise rate of a Internal Floating Roof when filling a tank. All we make sure...

Hi guys, Could someone advise me on the gap that needs to be left between flanges for gasket utilization? I'm having a hard time to find a reliable source where I can obtain this info. Any suggestion? For example is 3mm (compressed) adequate clearance for a spiral wound gasket for a #600 flange...