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2,165,526 Views • Sep 6, 2022 • Click to toggle off description
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Making a structure last as long as possible before it needs to be replaced isn’t just good stewardship of resources. It’s a way to keep the public safe and prevent environmental disasters too. Corrosion is one of the number one ways that infrastructure deteriorates over time, so cathodic protection systems are an essential tool for keeping the constructed environment safe and sound.
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Practical Engineering is a YouTube channel about infrastructure and the human-made world around us. It is hosted, written, and produced by Grady Hillhouse. We have new videos posted regularly, so please subscribe for updates. If you enjoyed the video, hit that ‘like’ button, give us a comment, or watch another of our videos!
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This is not engineering advice. Everything here is for informational and entertainment purposes only. Contact an engineer licensed to practice in your area if you need professional advice or services. All non-licensed clips used for fair use commentary, criticism, and educational purposes.
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Producer/Writer/Host: Grady Hillhouse
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Script Editor: Ralph Crewe
Background Painting: Josh Welker
Views : 2,165,526
Genre: Education
Date of upload: Sep 6, 2022 ^^
Rating : 4.972 (442/61,738 LTDR)
RYD date created : 2024-05-07T17:03:03.69444Z
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YouTube Comments - 1,756 Comments
Top Comments of this video!! :3
This channel is just a financial justification for Grady to do awesome garage projects
3.9K |
I had a co-worker that swore (and told anyone listening) that putting a (like in singular) boat anode on the rear bumper of a truck would keep the body from rusting. He said it "neutralized" the road salt...I was in the marine industry, and we ran across and interesting situation once. A gentleman had bought a new boat with twin outboards. He'd leave it on the dock for weeks, so he had an onboard charger for the batteries that was plugged into shore power. We had to replace the charger as it had been submerged. Easy job. Just disconnect some wiring at the charger, install the new one, and reconnect. That fall we got a call from the boat yard that hauled it. "There's a problem with the boat." I went over to look at it and was shocked to find the stainless prop all chewed up and looking like some medieval weapon and the drain plug, also stainless, corroded right off. Turned out, the people that rigged the boat in the spring hadn't connected the two batteries together and, the way the charger was hooked up, it was sensing the port battery needed charging, sending charge, but the ground between the two batteries was missing so it went through the motor, out through the noblest metal (the stainless) and found it's ground at the starboard motor.
2.7K |
I installed hundreds of passive cathodic protection systems on natural gas pipes in NYC (coatings + magnesium anodes), but only one active one (coatings+anodes+rectifier). The active one was on a section of underground high tension power line (345kv) in pipes bathed in oil. The field of anodes were like giant 12’ long candlesticks. The rectifier station looked exactly like the one you showed.
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The way to show roughness on camera is to use side lighting so the peaks are highlighted and the indentations are in shadow. (That's how artists create a sense of depth in pictures - they draw a sphere by adding highlights and shadow to a circle.) And depending on the size of the features, you might need to bring the camera in close to make small features visible.
524 |
I remember being taught this age 12. 8 years later I found myself working on a container ship in a Dry Dock. The Chief Mate, trying to show me up asked me what these things were on hull were, and this random seemingly pointless science lesson from a decade earlier came back to me.
Always pay attention in class, you never know what one day may become relevant.
800 |
For most boats with outboard drives, the housings are made of aluminum. In a saltwater environment, usually zinc anodes are used. In freshwater environments it's more common to use magnesium anodes. The houseboat we lived on for 10 years had an aluminum hull, and had an impressed current system. It was powered by a 1.5V battery, and a meter and potentiometer. The meter had a scale to indicate which way current was flowing, and you'd adjust it with the pot to try to get it to zero. We replaced the battery every year, but it was rarely ever depleted (the amount of current is in the microamp range). When in the marina, if you noticed the meter had moved off zero, it was typically an indication there was an electrical problem with a nearby power pedestal or boat.
368 |
I was working on a project that required water wheels in salt water. the pushing surface of the wheel was fastened to the steel frame with aluminum rivits. I replaced so many of those rivets before figuring out what was happening. this video is the best explanation of that process I have ever seen!
23 |
I absolutely love the Rust-O-Matic. Reminds me of the time I tried to do electrolysis for a science project and de-galvanized a bunch of washers by accident. Other fun potential uses:
- Acid rain timelapse! Also etching, corrosion as a useful tool. Glass! Concrete! Circuit boards!
- Thermal cycling fun times. Cold, hot. Cold, hot. Cold, hot...
- Speaking of thermal things: mild steel vs. carbon steel vs. bronze and their respective hardening/annealing properties. Seems like a good way to dunk samples into quenching fluid all at the same time.
- Put shapes into wind tunnels. Wheeeeeeee fluid dynamics
- Don't know if this could be done on a reasonable timetable, but it'd be interesting to see biodegradable/non-biodegradable plastics in action. Do they actually break down and go away, or do they just go into smaller bits and hang around for ten thousand years?
- Why you shouldn't just unplug high-voltage circuits. Bzzzzzzzzzzzt!
- Pushing four (4) buttons at once, over and over
- Donate it to Michael Reeves so he can gratuitously misuse it
- Hot dip galvanizing at home! Just hold your breath around the molten zinc.
- Impatient Fisherman Simulator 2022
118 |
Just curious if you weighed those samples before and after corroding them might be interesting to see what the percentage of metal loss is per day or hour.
827 |
Hey Grady, I work at Site C dam in Northern BC Canada. The construction budget of this dam has ballooned from a few billion to over 16B. Mostly from engineering challenges. Might make an interesting video if you felt like looking into it!
339 |
10:41 28.3 g of protection is worth 454 g of cure.
Or, 62.5 g of protection is worth 1 kg of cure, if you're just concerned about the ratio.
4 |
Grady I watch every video in its entirety because you deserve the boost in analytics for your wholesome, straightforward, and detailed approach to complex subjects. I enjoy every second and sitting through sponsor spots is my way of paying you back for such delightful content. Its got a vibe of serious business in a nonchalant but eager to teach you way that is TRULY appreciated. Among the greats!
10 |
Grady,
Ships have been using anodes and impressed current cathodic protection for decades. It has been over 50 years since I started training to be a naval architect and marine engineer. We were taught about the effects of corrosion on ships. Coatings, material selection, cathodic protection using both active (impressed current) and passive (anodes) andcombinations thereof. Shipping companies, depending on size and trade often have full time corrosion engineers to monitor corrosion and the performance of prevention systems.
One of the strangest occurences I encountered was on a double bottom tanker that had recently entered the Alaskan North Slope trade. As was practice at the time the cargo tanks were not coated and except for the suction wells there was no cathodic protection. After a small amount of oil started appearing in the double bottoms the cargo tanks were cleaned and inspected. Small pits about 12 mm (1/2") in diameter were found. There was a higher concentration of pits near weld seams.The pits had water in them. If you put your finger in the pit and rubbed gently you could get them to shine brightly. It turned out the pits were a result of a combination of water settling out of the ANS crude, sulfur content of the crude and the uncoated mild steel. The concentration of pits near welds was due in part of the raised area of the weld seam causing the water to pool and the heat effected zone around the weld changing the properties of the steel. The end solution was, after repair of the pitting, to fit anodes and to coat the bottom 1 meter (36") with a 2 coats of epoxy paint.
119 |
I pulled an engine out of the river a couple weeks ago, crankshaft, cam, piston rods, wrist pins and piston rings were still in the engine. The piston heads were gone. Best I could figure is that the piston heads were some alloy that sacrificed itself to save the rest of the block.
62 |
in the swimming pool business, we have sacrificial anodes typically made of zinc. they are plumbed into the pool return lines and linked up to the pool equipment. just my two cents. awesome video
26 |
Super cool stuff! My Dad did cathodic protection for a natural gas pipeline for 40 years! I never really understood what he was doing every day but now I do. Thanks for the cool series and I look forward to more.
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I'm curious how large of an area each of those little anode pucks would protect. I guess it would depend on how electrically conductive the steel is, how far the charge could travel along it to reach the sacrificial anode.
308 |
Cathodic protection (CP) is a great tool that is under utilized. One of the main reasons is it does require occasional monitoring and maintenance. And it's often the first area to be cut when budget cuts are made as it has long-term consequences, not immediate ones.
68 |
Loved how you set up experiments and tests that are fairly real-world yet simple/repeatable.
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