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- เผยแพร่เมื่อ 15 ต.ค. 2016
- How To Use the Pitot Tube instructional video discusses the Pitot and its connections, how to decide on duct test insertion points and how to connect the Pitot to obtain Static (Sp) and Velocity (Vp) Pressures.
Do provide feedback and suggestions for any other LEV related video clips you would like to see on this channel. Contact via www.oxyl8.com
Dang. I've listened to a ton of people and watched as many youtube videos. You sir, have hit the nail on the head. I am now confident and ready to work. Thank you.
useful video I understand the Pitot tube, but we are looking for briefing note for more information as you mentioned in your video.
Sir, you have an amazing pedagogical gift. Great tutorial.
Amazing video! Finally understood how to correctly use a pitot tube and feel confident enough to conduct my testing! Thank you so much, everything well explained, it all makes sense now!
Thank you for the tutorial. I'm a NEBOSH Diploma student and have exam questions on LEV systems and transport velocity. Really helpful.
Salute you Sir for the knowledge you provide here. Very useful.
Great video on Pitot and Velocity measurements!
Great video, thank you, you made it simple and clear.
LOVE the tunes! Oh and learned about Pitot!!
Thanks, You are a very good lecturer
Thank you! the class was very helpful!
You are most welcome. More videos coming over the summer
Very well explained! Thanks.
Well explained. Thank you, sir!
Well explained Sir. Thank you!
Super helpful. thank you mister
nice explanation. Thanks. Further I have few query n my mind. What will be the effect on static pressure and total pressure if their is damaged in duct line and addition air infiltrating into the duct apart from the design please.
Thank you so much for your great video
Very well explained
superb....amazing work..you are doing very helpful work for Engineering students......Thank you.........Keep it up.......
Thank you Pritesh. Next video series will be on the design, assessment and measurements to be taken at Captor Hoods (such as welding hoods). Ideas for teaching videos always welcome.
IM1 mate ? :p
Very well explained sir
Very good!
thank you so much super stuff
Awesome thanks
good job
Thanks a lot.
Thank you
Thanks, gave me the basics so I can build my own pitot tube to measure the airflow in my dust collection system. Now I just need to figure how to make and calibrate a manometer.
I do not recommend using a pitot in dust collecting units. Small holes in the pitot tube can become blocked.
@@aykutgurkan7008 Thanks for the tip. If you have a suggestion of a better way to make and use cheap/free home made sensors and instruments to gauge the performance of a dust collection system in a hobby work shop, I'm most definitely interested.
Actually though, the big worry is that a big chunk of something will get sucked through one of the blast gates, rattle down the duct and smash the pitot tube, or get hung up on the pitot, clogging the duct, which is why I rejected...blah blah 3d printed impeller...encoder from an old mouse...blah blah Arduino...display....wires...code..of some sort inside the duct.
All I really care about is relative performance so a water column and some marks on the wall showing how much vacuum I can pull when the filter is clean and the system is working is maybe a slightly better system than "Huh, the dust hood for the miter saw isn't working all that well today....maybe I ought to dump the dust bin"
Thank you a lot for this amazing helpful video, but I have a question,How I can measure the airflow for a compressed air system using this device to check the compressor efficiency ?
Hi Ahmad. Difficulty would be getting the instrument into the pipe and yet maintaining a seal. Not sure it can work in your application? Regards, Bill
Thanks
Please help me understand log-Tchebycheff method. How are the traverse points placed? Are there any mathematical formulas used to know their locations in the cross-sectional area? Thanks. I'll really appreciate a feedback as soon as possible.
can this unit be used to measure cfm air movement in a vacuum or compressed air tube of 1/2 inch ID diameter?
amazing !!! I'm building a wind tunnel and I'm looking for a pitot tube to,measure the air speed...
If you need help in identifying suppliers drop me an email to bill@oxyl8.com
How should I interpret the Negative Static pressure you measure? To get Total Pressure do I add the negative static pressure value to the Velocity Pressure? Or do in use the absolute value of the measured (and negative) static press (ie treat it as a positive value)?
How do I measure this on a large air handling unit fan with a large duct? Where my pitot tube can't even reach the middle of the duct because the cross sectional area is so large?
Ah! Then you need a big Pitot. You can purchase Pitots up to 3m long to my knowledge.
Can you use this instrument to measure duct leakage?
It can be used only to measure air flows in a ducted system. Duct leakage is usually measured from pressure loss using a manometer. You might find this document useful:- tc0502.ashraetcs.org/documents/presentations/Need_for_Duct_Leakage.pdf
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Sir we know V = ✓2gh where h equals to velocity pressure and volume equals to area of duct x velocity .
Now how do you find V= 1.29✓velocity pressure .
Somewhere I find V= 1096.7✓velocity pressure ÷ density where density is 1.23 lb/ cu ft air at barometric pressure 29.45 hg column and atmosphere temp is 460 + 75 °f . .
Pl text how do u find 1.29 ?
Can you please share the pdf
Anybody know how the 1.29 constant was derived?
that's the weight of Air
@@matreyasouthgate2184 that is the density of air.....
Sir what is 1.29 and how this no you find ? Pl share .
Sorry - I do not monitor this question log - but here is your (very) late answer. The full formula is (for metric conversions only) - V (velocity) = SQRT(Vp/0.5p) where p = air density. But in most cases we use Pitots in duct at around 20C where the air density is 1.2Kg/m3. If we put that figure into the main equation we could reduce it/simplify it to V=1.29SQRT(Vp) ...... but ONLY if the air in the duct is around 20C - otherwise you need to use the full equation.
Why readings are minus ..?
So you kept saying it was accurate from 90 to 70? Where is the accuracy?