Might not make a difference given thin wall of pipe. But as wall thickness was never stated we cannot verify. Still, 4" is a small diameter. So much so in fact that the wall thickness might be negligible. If pipe was several feet in diameter such as in case of municipal sewer then the walls would be thick and their thickness cannot be ignored. Just my 2 cents.
Anything regarding the flow inside a pipe or tube will use the internal diameter. Anything regarding the strength of the pipe will use both the internal and external diameter. The nominal diameter is just a rounded number that is vaguely correlated with the diameter of the pipe, and has some historical connection to the actual size of the pipe. For schedule 40 pipe, it roughly equals the internal diameter. Nominal diameters play no role in determining the engineering of the pipe. Design codes may refer to nominal diameters, but engineering fundamentals don't care about nominal diameter.
Hello Julanar, thank you for your question. To get the roughness coefficient using Hazen Williams, check the table on page 173. I will actually post a video clarifying all the three different roughness coefficients and how to get those coefficients from the reference manual. Thank you for watching and please share with your friends who might find these videos helpful. Good luck with your studying!
Hi . Thank you for the video. A question. What's the difference between darcy weisbach question and William hazen ? At what condition we have to use darcy weisbach and at watch situations we have to use William hazen? Thank you
Not sure if you are still looking for an answer, but she goes over this in "Head Loss Equation (FE Exam Review)". Basically, it depends on the variables which equation you should use.
The Hazen-Williams is a special case of the Darcy-Weisbach equation, and related equations such as the Colebrook equation for determining friction factor. There is no theoretical basis for any of this, it is all just curve fitting to experimental data. Only laminar flow situations can be solved in closed-form from first principles. Turbulence requires correlations to experimental data, or computational fluid dynamics. The Hazen-Williams equation is an older equation that was a lot more user-friendly in a pre-computer age, but its drawbacks are that it has a much narrower range of where it is applicable. The Darcy-Weisbach equation is more broad in its scope of where it can apply, but its drawbacks are calculations for friction factor that are not user-friendly.
Might not make a difference given thin wall of pipe. But as wall thickness was never stated we cannot verify. Still, 4" is a small diameter. So much so in fact that the wall thickness might be negligible. If pipe was several feet in diameter such as in case of municipal sewer then the walls would be thick and their thickness cannot be ignored. Just my 2 cents.
That is really good question. I feel the PE courses are all over priced, hopefully, one day I can make a course for the PE and make it affordable for everyone 😂🤣. To answer your question, try the EET, www.eetusa.com/, I think they might be the cheapest out there. I hope this helps and good luck!
New sub! Love your content :)
Thanks Kenza, FYI Hazen instead of hazel, lol lov u
Good video. However wouldn’t you need to use the internal diameter instead of the nominal?
Might not make a difference given thin wall of pipe. But as wall thickness was never stated we cannot verify.
Still, 4" is a small diameter. So much so in fact that the wall thickness might be negligible.
If pipe was several feet in diameter such as in case of municipal sewer then the walls would be thick and their thickness cannot be ignored.
Just my 2 cents.
Anything regarding the flow inside a pipe or tube will use the internal diameter. Anything regarding the strength of the pipe will use both the internal and external diameter.
The nominal diameter is just a rounded number that is vaguely correlated with the diameter of the pipe, and has some historical connection to the actual size of the pipe. For schedule 40 pipe, it roughly equals the internal diameter. Nominal diameters play no role in determining the engineering of the pipe. Design codes may refer to nominal diameters, but engineering fundamentals don't care about nominal diameter.
Hi, thank you for the great videos, would you please help explain how to get the roughness factor for the pipe from the reference handbook?
Hello Julanar, thank you for your question. To get the roughness coefficient using Hazen Williams, check the table on page 173. I will actually post a video clarifying all the three different roughness coefficients and how to get those coefficients from the reference manual. Thank you for watching and please share with your friends who might find these videos helpful. Good luck with your studying!
Hi . Thank you for the video. A question. What's the difference between darcy weisbach question and William hazen ?
At what condition we have to use darcy weisbach and at watch situations we have to use William hazen?
Thank you
Not sure if you are still looking for an answer, but she goes over this in "Head Loss Equation (FE Exam Review)". Basically, it depends on the variables which equation you should use.
The Hazen-Williams is a special case of the Darcy-Weisbach equation, and related equations such as the Colebrook equation for determining friction factor. There is no theoretical basis for any of this, it is all just curve fitting to experimental data. Only laminar flow situations can be solved in closed-form from first principles. Turbulence requires correlations to experimental data, or computational fluid dynamics.
The Hazen-Williams equation is an older equation that was a lot more user-friendly in a pre-computer age, but its drawbacks are that it has a much narrower range of where it is applicable. The Darcy-Weisbach equation is more broad in its scope of where it can apply, but its drawbacks are calculations for friction factor that are not user-friendly.
What was that pdf file you had on your computer? And how can I download it?
Thank you so much
Hi Gelo. Thank you for watching. You can download the refrence handbook from the NCEES website, just go to ncees.org/. I hope this helps.
@@Genieprep ohw thank you so much 😊💚🌹 I really appreciate you 🌹
@@gelomelo3426 Thank you Gelo. I really hope you pass your FE!
@@Genieprep 🌸🌸🌸
I'm plugging exact same numbers to my Casio, I keep getting 73.86 f. Which step am I missing to get your answer 54 f ?
Q^1.852
@@05adeleon Actually, I got 89.94 ft
Might not make a difference given thin wall of pipe. But as wall thickness was never stated we cannot verify.
Still, 4" is a small diameter. So much so in fact that the wall thickness might be negligible.
If pipe was several feet in diameter such as in case of municipal sewer then the walls would be thick and their thickness cannot be ignored.
Just my 2 cents.
Thank you
hey, what are your PE exam recommendations best website/ course thats not $1800.
That is really good question. I feel the PE courses are all over priced, hopefully, one day I can make a course for the PE and make it affordable for everyone 😂🤣. To answer your question, try the EET, www.eetusa.com/, I think they might be the cheapest out there. I hope this helps and good luck!
I found this killexams.com/pass4sure/exam-detail/NCEES-PE
The answers should show head loss as 'h' subscript 'f' not Q which is flow rate.
Bonjour