Recent content by Ask1122

Hi all, I have a question on vapor pressure. As far as I understood, a liquid will flashes into gas when the absolute pressure it is experiencing (in a pipe / in the atmosphere) is lower than the liquid's vapor pressure (assuming temperature is constant). Everyone knows that gasoline forms...

Hi all, I am having trouble grasping the phenomenon on why the LPG tank freezes as you use up more and more of the gas inside. My understanding is this. Initially, the tank is full of liquefied gas, and as you use up the gas, the pressure inside the tank drops, and since the temperature...

Thank you for the replies guys, but a question in terms of the explanation above, firstly, the bracket support can have a natural frequency of 45Hz, and the bearings holding the shaft can have a natural frequency of 35hz for examples, so wouldn't the frequencies in between the harmonics be...

Thank you for your answer, but would you please explain why do we worry about 2x and 3x the frequencies? Because the shaft is only turning at 1500rpm, it will not ever reach 3000 and 4500 rpm, so why are the harmonics important, and how do we even measure the amplitude of the frequencies that...

Hi all, I am confused with the amplitude at 1x, 2x, 3x frequency. The 1x, 2x and 3x is the harmonic (or mutiples) of the original frequency, meaning that if the shaft is turning at 1500rpm, then 2x will be the amplitude at 3000rpm and 3x will be the amplitude at 4500rpm right? But how will...

Hi all, does anyone knows of any good website that teaches you how to read turbine or compressor maps? And possibly teaches you how to select the best turbine / compressor for your particular application? Thank you!

This is just a suggestion, but I know that modern robotics often uses a liquid which changes it viscosity when a current passes through it (can't remember the name for that fluid) to act as muscles for the robots, I think that would be the ideal option in this case as this is a liquid, so it is...

Thanks for the reply, but I am not sure how it restrict only the displacements but not the moment?

Hi all, can someone please tell me what are the advantages of using a trunnion pipe support? I guess that since it is welded on the pipe, it will prevent pipe movements in any directions, but then why would you use a trunnion instead of an anchor? Thank you!

Hi all, for a closed container with water under pressure in it, let's say GAUGE PRESSURE of the container is 101 kPa, what will the boiling point of water in that vessel be? Will it be 100 deg C, or will it be 120 deg C because the ABSOLUTE PRESSURE of the water in that vessel is 202kPa...

Hi guys, I thought of something when I was rolling something. In a nut shell, why is it easier to roll an object once it started rolling, and what would be the force required to keep the object rolling? Let's use a car as an example, when you push the car, it will only start rolling once...

Thx Timmay, that make much more sense to me now. But then does it mean that all austenitic stainless steel comes in a solution annealed condition, I saw somewhere that austenitic stainless steel are not normalised, but i am not sure why? And if the nickel and chromium prevent the...

Hi all, just wanted to find out how is austenitic stainless steel made? Because when you heat the steel above certain temperature, your cementite starts to diffuse out and austenite starts to form, but the thing is this: if you allow the austenite to cool down, it reverts back to cementite and...

Can you please elaborate on that? I thought that it's the other way around, that the high delta P is the side effect of the control valve when the valves are in a throttling position?

Hi all, was thinking about this the other day. Is high pressure differential always a bad thing? Please correct me if i am wrong, but from the way I understand, high pressure differential is bad because if you have a high pressure differential across a piece of equipment (valve, pump, fitting...