[Part 12] Kilowatt Microhydro Turbine - Penstock Repair
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- เผยแพร่เมื่อ 31 ม.ค. 2025
- In case it wasn't clear in the video I used a steel cable to secure the penstock to a chunk of old pipe under a pile of rocks.
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i freaking LOVE this hidden gem of youtube
Got a laugh from me with the "Every spring visit day is leg day" thing. You win this round.
Every day is leg day, Monday Tuesday Wednesday (ignore me, just reminded me of a song)
At 4:00 "My nuts are loose here... and everything's twisted". Hey, at least it is still shorts weather, so adjustment shouldn't be too hard. :)
lol exactly my thoughts!
Ouch that's painful!
I was going to say that it sounds like a personal problem.
My thought was "TMI dude!" :D :D
I am in awe of this man; he's absolutely amazing!
i dont know why but i came across your videos for hydropower and i am genuinely interested to see how things work out and power generation etc etc
so you keep doing what your doing and i will keep enjoying your videos :)
One way to prevent shutting off the water to quickly is to replace the quarter turn valve with one that must be turned multiple times to turn on and off like I believe is called a gate valve. A stand pipe might work if it is high enough so it doesn't over flow.
Hey, another up load! 🙂
I love making things with a bit of a technical aspect. You get to use words like water hammer, forebay and penstock. And you get to season them with words like inertia, turbine bay and kilowatts. And you get to use math you learned in school except you sit there saying they never even tried to teach me this stuff in school... 🙂
Great progress! You're going to continue to have issues with the penstock moving for a variety of reasons. The pipe is slick so you have very little friction and a good deal of slope on the hill. I recommend securing it in several places with sturdy polyester rope to the base of the trees as these provide an anchor point that's not easy to dislodge. You'll need a good way to ensure the penstock doesn't just slip through the rope. Steel bar bent into an L with some hose clamps to clap one side to the pipe should do the trick. Angle brackets for wood are at the home centers.
I further recommend that you secure the barrel in place and insulate it because even with water flowing through it, there will be eddies along the sides and these will freeze in winter and the ice will migrate in until it chokes things off. We all hope that the water flowing into the system is warmer than than freezing - but you need to preserve that warmth into the big black barrel. Once the water is in the penstock, it's all moving and should not freeze under most conditions.
Best of luck!
10:20 What is cool about the international system is that you can convert pressure to water elevation instantly.
Here, we have a pressure of 8.25 kg/cm2
Imagine a "box of water" 1cmX1cmX100cm = 100cm3 = 100ml = 100g = 0.1kg of water per meter of elevation
8.25kg x 1m/0.1kg = 82.5 m
Thank you for the video series, I'm jealous of your property and nice your nice hobby!
One day it will be my turn... One day!
wow, 120 psi, thats crazy! nice job man, i cant wait till the next video
Wow! It actually pull the barrel? Pretty good force.
With the few gauges I have worked with I think they were + or - 12% give or take and gauges that are super accurate tend to be out of the average joe blows price range. Lets just hope the 120 psi is correct so you get the best power for what you are doing. Can't wait to see the turbine running.
I can try a few gauges from various suppliers and average them together, but that's a subject for next year I think.
Your flow test in the previous video shows spot on 30gpm (half a bucket in 5 seconds), so a few quick calcs show your 760' long 1.6" diameter pipe contains about 660 pounds of water travelling at over 3mph (or 304kg at 1.44m/s for metric types). Wikipedia tells me that means it has the same kinetic energy as "an average person jumping as high as they can" or a 165lb person running - it's no surprise it pulls the pipe!
If there are ways to mitigate a watehammer, you should consider them. If you are not able to mitigate the watehammers, you should at least let it fail as gracefully as possible, meaning account for that it will fail, but have it in such a way that when it fails again it does not drag your whole setup down with it. Good work there buddy, keep it up.
Might consider an additional support midway down say just below the coupling from the top pipe and bottom pipe. I would use nylon instead tho. Nylon rope will stretch just a bit, but return to pretty much where it started. May use the steel cable a little slack as a stop. Trying to stop all movement at one spot will likely just move the area of fault to somewhere else. Adding in additional support with some dampening should reduce the strength of the hammering enough to prevent failures all together.
Alternately you could add a pressure tank :) Similar to what is used at a well house to prevent the water from busting pipes in the house. It's just a metal cylinder with an air bladder. You just match the air bladder to the pressure you expect and it expands and contracts faster than the water can move to equalize the pressure and smooth out the shocks you would otherwise get. The water rushing in after you turned off the flow would flow into the tank and crash into the air bladder. Adding in a check valve would prevent the shock from going back up as well and give you an anchor point (the tank to some concrete) for the system so that it doesn't disturb you down at the bottom as well.
Have you considered building some suports or fixtures for the pennstock? The next small water hammer is just a question of time, it will slip a little with every closing of the pipe..
He anchored his pipe to a big block of concrete
Good job. Keep up the good work
It's probably not necessary but I wonder if wrapping the Barrel in bubble foil tearing your freezing season might be a good idea to avoid ice build-up on the inside of the barrel even though the water is flowing there's a slight possibility the water might freeze to death outside the barrel if the water is Flowing slow enough and possibly the pipe coming from the spring might start to ice up I think bubble foil would be enough to keep it warm enough until it got to the barrel and started to either head down the hill or overflow
Good point about the freezing. I would substitute the bubble wrap for bails of straw. They would act as insulators as well as support for the barrel. The only problem is getting them up the hill.
You mentioned the pressure guage might not be accurate. You stated previously #11 that you had 120 + psi pressure. According to google and the Internet water produces 0.434 psi per foot of height. If you divide 120 psi by 0.434 you get 276.5 feet. Would you say that spring is that heigh above your based elevation?
Wow, the joy of emperial measurements... I saw a bit over 8 bar on that gauge, one bar is 10 meters, so it should be a bit over 80 m high.
Legday, loose nuts, shorts & T-shirt weather! Man if ya didn't know what's going on, someone could get really confused, and possibly the wrong idea! Ha-ha!!
If you take your climbing rope and use it to tie a few preseck knots on your penstock and wrap the other end around a tree, then your penstock won't be able to fall.
As a thought, you could drill an anchor bolt into that concrete to attach your steel cable to something that absolutely will not move. That would give a lot more relief against water hammer issues.
Looks like some strategic applications of concrete are needed to keep things in place. Or drill into that old concrete to install an eyebolt to connect the wire rope. If you want it to stay put, drill down into the top then use some hard urethane resin to pot the bolt in place. I have some secured into holes in concrete as tie down points for a metal pipe tent frame with a heavy tarp. Been in place for over 10 years, they haven't pulled out with vertical tension. So pulling perpendicular to the drilled hole will be even stronger. To be weather resistant I'd use stainless steel wire rope and other hardware.
You can prevent water hammer with a standpipe at the top of your fill pipe look it up online . Goddle what is water hammer and how do you prevent it.
I would have recommended leaving an anchor on the water line at the top of the hill.
I did anchor it.
@@JoeMalovich Good deal, I must have missed that. I worked maintenance for a water dept. for about five years, you're spot on with what you said about water hammers.
Oh...
You got hundred feet plus up hill... I was thinking that valve set up was a trompe pump creating that 120 psi... I got it now, I watched a video out of order because my feed and what I search, the other day you had all pipes before the cinder block set up now,
I'm all over the place, but I watch them as they come 👍
Sorry I can't donate, everything came down on me the same Time as this pandemic, I'm in the middle of building a house with tires and sand bags but broke now...
But hopefully giving you views help.
Likely barrel was empty while the water hammer hit. more ballast and less hammer. Is there a way to have a tall piece of pipe for a blow off.
Proof that thrust blocks are important
Unfortunately I don't own the land, so concrete is not an option. It seems fine now but I could do thrust tethers with stakes in the future.
5:30-ish... feel like I am watching Jaws, the first time they actually hook the shark.
-Shawn
Are you going to anchor the barrel?
Need a water hammer arrestor. Easy to make.
Can someone please tell me what this is about
Water hammer!
Maybe tether the plastic drum
man hearing that winch ratchet I think of Ghost Ship
❤️🎥
What is the scientific nature of the ooga-dooga?
The sound an air impact makes.
@@JoeMalovich nah, it's more of an ugga-dugga than an ooga-dooga.
@@TacoMaster3211 potato potato
@@JoeMalovich no, it really doesn't sound like potato potato.
Man... Fuq them bugs...
Reason why I'm surrounding my home with ponds... Maybe bat houses too
First
this sucks