Kenneth Lamb

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@22_nabilhamzah79 3 күн бұрын

Love your explanation, it's very helpful.

@silverbackdungeongorilla4315 18 күн бұрын

man you sound like postal dude from the postal game

@rbert1829 Ай бұрын

Maaaan, that was super helpful to my understanding!!

@ucheanyanwu5972 Ай бұрын

Thank God for software 🤲

@Sunnahclips1 2 ай бұрын

Thanks for the informative video.

@alecsandoval1214 2 ай бұрын

Hi Kenneth, I followed up until the units conversion. Shouldn't 12Din=Dft and similarly for Q 448.8Qgpm=Qcfs Thanks for the helpful video.

@alecsandoval1214 2 ай бұрын

I've been giving it a lot of thought and my conclusion is that because this is an empirical formula, we are not converting units but rather making a substition. xin/12=yft

@kennethwlamb 2 ай бұрын

@@alecsandoval1214 That is correct. It may feel backwards, but the objective is to substitute values.

@muhammadsalmankhattak2352 4 ай бұрын

Sir why you stoped making videos 😢

@kennethwlamb 4 ай бұрын

I appreciate the comment! I took a position that didn't leave me much creative bandwidth to make videos. However, I'm back teaching engineering full time so I'm planning a new series of videos to launch this fall!

@ChristoAnd 4 ай бұрын

What is cavitation?

@atakanyaman5013 5 ай бұрын

U are right sir I thought I would never use this again after I graduate but there I am :D. Thanks for the clean explanations very helpful.

@AldilaPutriSyamsudin 5 ай бұрын

thankyou kenneth may I ask you? how about the line with different shapes?

@kennethwlamb 5 ай бұрын

Can you clarify what you mean by different shapes? Do you mean different channel shapes (for example, trapezoidal, or triangular channels)?

@sachinhumtum 6 ай бұрын

Please let me know welding reduction factor (W) for A358 304H (18 Cr ,8Ni)

@francissolis 6 ай бұрын

I'm back! I took your class in 2014 and now I need a refresher. Thanks professor!

@suuris1 6 ай бұрын

hello kennet, by the AWWA on page 61 they calculate the deflection of pipe using this equation, but in the calculation of I there is no consideration of the parameter b they only use t^3/12 . can you please tell me in which cases i take b in to consideration and in which cases i dont ? thank you for your help

@hapless_152 7 ай бұрын

"If you enjoyed your first term of calculus" LOL

@AndreaCuripoma 8 ай бұрын

Hi, thank you so much for your video it is very precise and summarices the criterias when sizing a sewer system. Can you please help me with one question regarding the interpretation of some codes? For example the -10 State Standards- mentions : "All sewers shall be designed and constructed to give mean velocities, when flowing full, of not less than 2.0 feet per second (0.6 m/s), based on Manning's formula using an "n" value of 0.013" and provides a table with minimum slopes. Does the part "when flowing full" mean that the velocity we check is the one gotten with the ratio d/D = 1? Or for example in other codes it says: "mean velocities when flowing 95% full", so in that case also, the velocity checkin is with a ratio of 0.95? If so, considering the normative mentions a minimum diameter of 8 inches for mains and in initial pipes of the systems we will not get a peak flow that achieves that radio, how should we proceed? Thanks in advance for your reply.

@kennethwlamb 8 ай бұрын

Sometimes an agency may ask you to specify the minimum slope of your pipeline. To do that, solve Mannings equation for slope and compute the resulting slope when velocity is set at 2 ft/s, and the pipeline is assumed to be full. Do not use 95% capacity when analyzing the hydraulics of a pipeline, it results is an overestimation of the flow capacity.

@delinquense 9 ай бұрын

So sad! what would have otherwise been just a great video but because of an error in the conversion of inches to feet I spent an hour trying to figure this out Being someone without any type of background in this area it's really frustrating to see that videos like this are still published with errors. For heaven sakes please just take a few extra minutes to review your work before publishing it. you tell me you have students that make errors and then you do it yourself and make a similar mistake.

@lekunyemalefane244 10 ай бұрын

Greetings I am Malefane From South Africa. Thank you for the brief but very clear explanation.

@karimrahouni2385 10 ай бұрын

thank you very much for this precious lessons.(Greetings from Morocco)

@muhammedg-tips1584 11 ай бұрын

thanks for your great effort

@MariwanRostam Жыл бұрын

Hi Sir I don’t know how thank you for great series videos thanks again for being here!, it’s possible to creat a new video to stay a-bit about how to calculate the design flow rate?

@one-eyejawa3128 Жыл бұрын

Question: If you google the pump affinity law for flow versus diameter you also see the equation Q2/Q1=D2/D1 floating around (lacking the cube on the D's). The PE/FE handbook follows the equations you've specified. Just trying to figure out what I'm missing as I have never worked with pumps before so this is mostly new information, and the two different methods yield different results.

@kennethwlamb Жыл бұрын

I reviewed my notes on this video to make sure I am confident what I did was correct. The math basis for the affinity laws is a dimensional analysis. This means the discharge, Head, and power coefficients are formulas designed to produce a result that has no dimensional units. If you look at where I start with the discharge coefficient, you can see that the units of each variable cancel out. My guess is that the formula you're seeing that differs from mine simply is a typo or else the dimensional units would not cancel out.

@macraynelomac4280 Жыл бұрын

GOT ME ON THE WHOLE "WHAT WOULD YOU HAVE CALLED IT?"

@amanthakur652 Жыл бұрын

Thank you

@josedealvarmirandahuerta2579 Жыл бұрын

Such a nice explanation, here a Mechanical engineer from Piura Peru congrats

@alxomnm Жыл бұрын

this is just great!! thanks

@sgueto0590 Жыл бұрын

Wow! Well explained.

@guidemonkey6407 Жыл бұрын

Does Hazen Williams equation work for flows that are not constant? Such as a flow that is a function of a parameter x where x is the distance water has traversed in a pipe?

@kennethwlamb Жыл бұрын

I have not thought about that before. However, Hazen-Williams is very famous (infamous?) for being applicable to very specific fluid conditions. Since the equation was developed from observing flow in installed waterlines, I would guess that the answer is "No, Hazen-Williams can not be used for non-steady flow conditions."

@fatmaakl5609 Жыл бұрын

Thanks a lot Kenneth

@bell_khalo Жыл бұрын

This was helpful, thank you!

@keithw8217 Жыл бұрын

I had a problem like this on the PE Exam. Nailed it!

@kennethwlamb Жыл бұрын

Glad to hear it! I hope you passed the whole thing as well!

@keithw8217 Жыл бұрын

@@kennethwlamb I passed the test and rocked that problem!

@kennethwlamb Жыл бұрын

@@keithw8217 That's awesome! I'm happy for you and what you'll do in your career now that you have your license!

@neilmenon8943 Жыл бұрын

Could you shows how to program the plots to look like yours

@MarioPereira-u5h Жыл бұрын

quite interesting on how you are able to get the units into the cells and perform calculations. For Example cell E3

@kennethwlamb Жыл бұрын

Yeah, i learned that trick from a business major years ago. Go to the cell properties (Ctrl + 1) and click on Custom for the number format. Anything you put into quotes " " will appear as text but not be considered as data in the cell.

@Szhihihihihihi Жыл бұрын

Thanks !

@one-eyejawa3128 Жыл бұрын

Working on a similar problem but am having an issue I was hoping you could help with. Ive found that the pressure I calculate at point 2 is directly tied to the flow rate that I assume when calculating the head loss. I don't have a specific demand. I just want to see the maximum flow obtainable by extending a waterline a certain distance with a given static/res. pressure at point 1. Would you just assume the residual pressure at point 2 is zero psig to obtain the maximum flow (solving the energy equation for h_L) since the pipe is exiting to atmosphere? If that is correct then the max fire flow is where residual pressure is 20 psig?

@kennethwlamb Жыл бұрын

Yes, that approach should also help you find the max flow (when p2 =0) and the max fire flow (when p2 = 20 psi).

@one-eyejawa3128 Жыл бұрын

@@kennethwlamb on a different note, could you consider the pressure drop from static to residual pressure to be equal to the head loss from the source to the point at which the reading was taken?

@kennethwlamb Жыл бұрын

@@one-eyejawa3128 yep, that is correct

@one-eyejawa3128 Жыл бұрын

@@kennethwlamb thanks! 10 years out of school and just now starting my EIT time. Some things are a little rusty.

@kennethwlamb Жыл бұрын

@@one-eyejawa3128 Good luck to you in your preparation!

@GeoCalifornian Жыл бұрын

My $10 Casio fx-115ES pocket scientific easily tackled this implicit equation, as did my $20 pocket hp17bii financial calculator. /In the Newtonian World

@francissolis Жыл бұрын

7 Years later and I am still referencing these videos. Thanks Dr. Lamb!

@SeanLeeOliver Жыл бұрын

Impressive!!! 👍👍

@slengoslengaw8510 Жыл бұрын

Is NPSH calc applicable for closed loop systems? I only saw open loop examples and nothing for closed system

@kennethwlamb Жыл бұрын

The same process to analyze NPSHa in an open loop system applies to closed loop systems as well.

@slengoslengaw8510 Жыл бұрын

@@kennethwlamb is there any example you can point me to?

@kennethwlamb Жыл бұрын

@@slengoslengaw8510 The NPSHa calculation does not consider anything that is on the discharge side of the pump. Therefore, I do not see how the system being a closed loop or open loop would change the calculation. Is there a sample system you have in mind? One small difference in the NPSHa calculation can occur when the source of water on the suction side has a starting pressure that is greater than atmospheric pressure. For example the pump is pulling water from a pressurized storage tank. In this situation it is not just the elevation difference (ztank - zpump) but the elevation of the tank plus the tank pressure (then subtract the pump elevation)..

@oleopathic Жыл бұрын

Might this problem be solved by hand for practicing for the civil PE ?

@kennethwlamb Жыл бұрын

This exact problem won't be in the PE (at least not any more). They typically simplify the three Reservoir problem by giving you the flow rate in one of the three pipelines. That makes the solution algebraic and not numerical

@oleopathic Жыл бұрын

@@kennethwlamb thank you for reply. Would you have this sort of a simplified problem I might practice on ? Was working on a CERM problem, got stuck, came to your channel and still stuck.

@kennethwlamb Жыл бұрын

@@oleopathic I have another video that sets up the problem by hand. does this help? kzbin.info/www/bejne/bHLMi32tmLtkfLc

@oleopathic Жыл бұрын

Does an example problem exist within your channel to practice for the PE ?

@oleopathic Жыл бұрын

This is a very interesting channel. Are there any civil PE exam videos here as well? Plans to publish PE items ? Subscribed. Beautiful, succinct explanation of open channel concept and math.

@kennethwlamb Жыл бұрын

In a way... these are my PE Review materials. I used to teach a PE review class and I would simply cover the items in these videos. Are you looking for videos solving practice problems?

@oleopathic Жыл бұрын

@@kennethwlamb yes! I'd say that I'm looking for 90% problems and 10% theory at this point in my studies. Again, love your channel.

@drbigtop Жыл бұрын

Thanks for the videos. What did g represent in the formula? Gravity or a number from a chart?

@kennethwlamb Жыл бұрын

It represents gravity

@danhan6996 Жыл бұрын

Why did you add 7'/2 to the invert elevation? Shouldnt the WSE just be the invert elevation plus H? Thanks

@kennethwlamb Жыл бұрын

H is measured at the centerline of the pipe. Not the invert, so that's why I divided the pipe diameter by 2.

@kandari_hasansir1531 Жыл бұрын

You are too good ..........sir Thank You

@hussainmustafashahzad4189 2 жыл бұрын

How did excel took ratio and text as input ?

@kennethwlamb Жыл бұрын

Inside Excel you can add custom units that do not affect the number value. Basically in the cell properties you can select custom units and after the value you can put into quotes (") the unit you wish to use. Here is a MS Office article on how to do that: support.microsoft.com/en-gb/office/create-and-apply-a-custom-number-format-6c308025-35da-4047-9481-c146a12063df

@baytalhikmatanger 2 жыл бұрын

ملخص رائع، استمرارية موفقة

@Jin-Daniel82 2 жыл бұрын

THANK YOU 😀

@greentechguru362 2 жыл бұрын

Sir one question. How to calculate npsha for pump in series

@kennethwlamb 2 жыл бұрын

Believe it or not, it would be the same process because the NPSHa would be computed at the first pump. You could compute NPSHa for each subsequent pump but it likely would not be useful as the most critical is the first pump in the series.

@greentechguru362 2 жыл бұрын

@@kennethwlamb sir NPSHa for first pump in series I calculate as patm+ (water level minus impeller eye level) minus vapour pressure. Here first pump takes water from source ie dam or reservoirs. Now for second pump which is in series here NPSHa= residual head left behind at impeller eye of second pump minus vapour pressure. Here I doesn't take atmospheric pressure. I think I m on right path.

@kennethwlamb 2 жыл бұрын

@@greentechguru362 Yes I think you are on the right path. Perhaps I would have explained it as: When considering the NPSHa for the second pump you must replace the potential energy calculation (Res elevation - Pump Eye) with the static head between the first and second pump (Dynamic Head - Pump Eye). You could say that the Dynamic Head at pump 2 is the residual pressure at pump 2. Therefore we are in agreement.

@mikkomakkonen4987 2 жыл бұрын

My highschool physics teaher want us to do this and nowhere on the book do they explain what the fuck this is. Also we have no calc yet :)) i want to die

@kennethwlamb 2 жыл бұрын

Let me know if there is anything I can do to help you work through it. Perhaps I can create another video showing how to create this graph in Excel. Would that be helpful?

@ahmadhaziq3358 2 жыл бұрын

I really appreciate you making this playlist such a compact and easy to understand video. I love your explanation! cheers

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