Recent content by hello2006

Hi JStephen, thank you very much for your reply! I do not need to consider the deflection and there is no internal forces in the structure. I do have four unknown here. two of them are one alxe symmetry. I am thinking if there is no symmetry, how to find four equations to solve four unknown...

Hello Everybody, I have a question about force distribution calculation. Suppose there is a rectangular with a force perpendicular to its surface at some point, but not center. how to calculate the force distributations at the four corners of the rectangular? My problem is actually a weight...

I am not sure yet if it is welded or threaded. How to decide which one is better between welded or threaded? My thinking is that the pipe is for oil and I do not want it to be easy to leak, therefore, maybe I prefer welded. Since the temperature is only about 50 C. I am not thinking to sue...

I am just thinking Grade A give me more safety factor. I thought there is no much difference between Grade A and Grade B. Is that correct? thanks!

Hi Dcasto, Appreciate your information! I thought to use ASTM A106 GRADE A. therefore, our thinking is quite similar to each other! thank you very much! hello2006

Hi Biginch, Sorry for forgetting to mension those data! The operating pressure will be about 50 psi, the temperature is about 50 degree C. there is no external load since the pipe is within house. Cost if not very expensive and normal price will be ok. Anticorrosion should not be problem since...

Hi Everybody, Just want to confirm if there is minimum distance requirement between ceiling and the top of pipeline? My pipeline is an cooling oil pipeline suspended from ceiling with 3.5" diameter. Another question is what kinds of pipe material normally can be used for this kind of pipe? My...

Hi Tmoose and Rarswc, Appreciate a lot for your information! happy2006

Hello everybody! Would you please tell me what book is good to learn about metal frame design? I am trying to design a metal frame base for fan and motor. I am thinking if there is a book which describes the common rules or steps for designing metal frame. After I learn this, I can not only...

Hi thanks civilperson, I am thinking that pounds is an unit of mass, but not weight, right? In my calculation, I use the pounds as unit for pipe and other conponents. Actually that is mass of pipe and others too, right? When I was choosing hanger rod, the catalog also shows the pounds as the...

Hi Good morning everybody! I am calculating the force of seismic for designing pipe support. I have HPGA =0.44 g. Can I simply use F= 0.44*g*weight of pipe? Because I think F=am, here a=0.44*386 (g=386 in/s2), therefore, F=0.44*386*weight, Is that correct or I should use what formula to...

Hi Everybody, would you please say something about bearing? What is the difference between bearings which are used for belt driven and bearings which are used for direct drive? Can they inter-changable or not? Where is the bearing located in the fan? I do not the reason why the bearing used...

centrifugal fan, clockwise downblast, double width, double inlet, airfoil type, class III, 24” diameter. The proformance is 18000 SCFM, 8”SP, OV = 2900 FPM, BHP=27.45, RPM = 1985 That is the specific of my fan. If you have any warning that you think I should be careful for this fan, please...

Hi Doct9960, Thanks very much for your reply! Actually, I know my question is not the one that only expert can anser. but I mean everyone who is better than me looks like an expert in my eye. :)! (to show my respect and appreciation!) Do you mean that "AEF 1/1000" is the chance seismic can...

Hello Djack77494, thank you very much for the message! My client wants me to make sure that the cooling ability of the fan system can be the same as before or a little bit higher is no problem too, after My make some modification for this fan cooling system. My client currently is using belt...