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Hello, I have to design a heat exchanger with variable load such that the outlet temperature of the shell side (gas at high pressure) is maintained at constant temperature. I have two options: [Option1] Use single phase water on the tube side and control the shell side outlet temperature by...

Hello, I am in the process for designing a blower from scratch for a very special service condition which is generally not met by commercial blower manufacturers. I would like to know if there are any correlations/theoretical techniques that can predict the surge point for a given impeller...

georgeverghese .. thanks for idea!..I was wondering if there is any correlation for heat transfer from a flat plate on which a number of cylinders are arranged perpendicular to the plate in an array...like tubes emerging from tubesheet. Abhishek

Hi..which section of which book? I don't think you can find this in any standard heat transfer book. Abhishek

Hello, Is there any way to calculate the heat transfer coefficient at the shell-side surface of a tube-sheet in a shell and tube type Hx? Of course CFD is one option, but is there any easier alternative? Abhishek

Q-What pipe size are we talking here? A- Its 170 mm ID, Thickness: 8mm Q-Do you need welded pipe? A-No it will be a seamless tube Q-Do you need steel pipe? A-Steel (2.25Cr-1Mo) is from process and cost consideration Q-Could you use reeled pipe? A-No its straight lengths..not reeled Q-Is the...

There are 5x5 number of tubes for the larger size..6x6 of the smaller size..both are 300mm long Abhishek

Hello...no there is no flange to speak of..there is no explosive environment..it is 8mm thick so should be weldable in a single pass, else I am open to reducing the thickness to 6 mm...after each weld is finished it will be subjected to 100% radiography before moving on to the next tube...hope...

One is 186mm od and the other is 60mm od..so very different Abhishek

Thanks EdStainless and LittleInch .... 300 mm is quite large for my use, but using standard open welding heads a gap of 96 mm is workable for me.. In my case each of the welds will be radiographed once each weld is done, one at a time. Also, the media is non-aggressive, so it should be...

Hello, I have a tube array with two different tube sizes. The larger ones are located in a square pitch in a 5x5 arrangement. The smaller ones are located in the centres of the diagonal of the larger ones. If you rotate the assembly by 45 degrees, its clear that both the tubes are arranged in a...

Hello, I have to design a 2D array of tubes, where each tube is to be butt welded to corresponding stubs (also arranged in an array). I plan to weld the tubes row-wise. Hence, there will be access from one side only. Is there any guidelines regarding the minimum gap between the ODs of adjacent...

To MacGyver2000... (1) How to calculate the induced current? (2) What is the proportionality constant?

Hello, Can anyone point me to any references which gives the calculation for torque generated in an induction disk type relay? I am aware of "very basic" expressions for the torque as in this link (https://www.eeeguide.com/induction-relay-torque-equation/), but I was wonder if there exists any...

Hello, What is the reasonable valve of out of roundness [as defined by UG-80(a)(1)] that can be obtained after correction? UG-80 says "the difference between maximum and minimum inside diameters at any cross section shall not exceed 1% of the nominal diameter". What I would like to know is as...

Dear Artisi, yes I did, but couldn't come up with equations or design rules. All I could get were some CFD calculations for some specific impeller designs.m What I need are mathematical formulas (ideally) or design guidelines. Abhishek

Hello, Can anyone point to any publication having the guidelines for design of pump-out vanes in radial centrifugal pumps? Thanks! Abhishek

Hello, Can anybody point me towards any reference that deals with calculation of pressure drop of the gas phase in a spray tower type scrubber? Abhishek

I finally got it!!. After a lot of digging through old documentation of the plant I finally got it: It means "leads to data logger"..thanks for all the help!https://files.engineering.com/getfile.aspx?folder=6fdd27e8-4cf0-4537-a2c2-293be574b1ac&file=F.png

Thanks for all the responses. I am attaching a few more examples from the other drawings of the same plant. Hope it makes things a bit clearer.https://files.engineering.com/getfile.aspx?folder=1d902350-1990-4679-a4cc-9d44bd5cb229&file=MoreExamples.zip