Ultrasonic thickness testing the steel hull plates on the trawler
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- เผยแพร่เมื่อ 3 มี.ค. 2019
- In this video I clean up the hull plates and then ultrasonic thickness test the thickness of the steel hull plates using a Checkline TI-25TLX www.checkline.com/wall_thickn...
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To any company that sponsors Dangar Marine consider it a good investment. I enjoy his videos and would seriously consider purchasing any tools and materials he would use. I am sure a lot of viewers would.
I agree 😉
Agree!
i agree
Agree
J D I’ve actually bought stuff , (only an impeller) from marine engine.com, as a result of watching dangar
I wasn't ever planning on buying a steel hulled boat, especially a old one and watching this series has reinforced my opinion on the subject. But I love hard work, so I could watch you do it all day.
Good to see reputable new sponsors getting on board with Stu's project. The Checkline unit looks like a quality item.
I just checked them out, they make a ton of products!
How you do not have a small army of volunteer workers is beyond me. If I lived near you I'd happily spend some of my time off helping out. Can't get enough of this project.
You have a really good community surrounding your channel, it’s a small community but it’s a loyal one, which is good to have
Right! He's made a ton of awesome videos though and just built it up!
Well Enduro , I just sub'ed a week ago. Been loving the content, I guess it's getting bigger LOL
I completely agree! Great quality videos and great comments. And huge plus that he's built it up without being in your face about marketing.
Best boat videos on youtube , the guy is honest and open about his mistakes , shows you all the down and dirty work it takes to get the job done ....highlight of my day is seeing a new video from him 👍
During my time in the Royal Navy, I had the dubious pleasure of serving on an Aircraft Carrier, the whole surface off the flight deck needed to be stripped of it's paint, and those needle guns were the weapon of choice - what an incredible noise that was.
Because they were powered by compressed air, they acquired the nickname of "Windy hammers".
I'm actually in the market for a tester and was on the fence about a few. But I'm sold on the check line thanks to being made in the USA and your review.
I had to prep a steel boom boat tug before a sandblaster came in to clean it, and the needle gun is what we used, worked great. We tried a creeper but it would not roll due to the crud coming off the hull so we modded the creeper to take 8" hand truck pnematic wheels, and it worked great. Also we put a curtain up off the gunale of the boat down to the ground, used respirators which kept the mess in as well as a lot of the noise.
There is no replacement for true sandblasting on a boat, the employer tried to have me clean it with a wet blaster, and in the end brought in a sandblaster.
Especially when you are talking about painting it and getting it to stick on
Big admiration for a true grafter with some considerable skill and problem solving ability. If only for your health, make sure your needle scaler is high quality or wrapped in some kind of insulating material (cheap pipe lagging is good). That amount of scaling will give you serious white finger and possibly damage the cartilage in your fingers which would be a tragedy for a guy like you. Big thumbs up from the uk, Mark.
Thanks mate. Won't be doing too much needle scaling and will be wearing gloves.
Great video!
Tip: add cayenne pepper powder to marine hull paint. (If you're repainting the hull).
Barnacles won't be an issue anymore.
I’ve got a buddy that’s a car hauler and he literally was at the mercy of the repair shop that wrote the proposal to replace sections of steel tubing. If he had that sweet CheckLine thickness tester he could have comfortably done the work himself. I will be telling him about that tool!
There is nothing like being able to do tests like this for yourself. They can end up paying for themselves in no time.
Cool demonstration of the ultrasonic tester Stu. This is one way that aircraft are checked for stress cracks in the skin.
I professionally sandblasted for several years, mostly heavy equipment but if you need any tips don't hesitate to ask.
If you're going to be hiring someone with a professional rig (600 lb pressure pot and towed compressor) you are absolutely wasting your time with the needle gun. The sandblaster is going to cut through it so effortlessly.
I have had mixed results with wet blasting however my equipment was not the best and I was primarily working on residential brick for graffiti removal.
otm646 second this. A professional blaster will rip everything off and take it down the white metal. Even rust scale. Literally everything that’s not welded on Let the blaster do the work for you.
Aye, there ain't much stops a big shot blasting outfit.
There is nothing on that fine vessel that will give much of a fight.
The other thing is, you blaster man may want a certain amount of money to turn up, set up, and maybe clean up.
On a job that size, that's the bit that's going to take the time.
Actually doing the blasting is the quick bit.
You'll not be saving yourself a great lot of money by doing some of it. It's an insignificant issue compared to the set up time and costs.
Totally agree with this Stu, not only will it save you time, effort and money but it will also save you with community good will. Save up "pissing off the neighbors" points for down the track, I'm sure you're going to need them.
It is a fair point you make. I'm going to give some wet blasting a go on the section I've already taken the paint off but I'm leaving the whole underside to the sandblaster.
@@andrewdavies4604 - In the US there is a difference between "shot" blasting and (wet or dry) sandblasting. "Shot" is actually very small steel beads. Shot blaster typically have some kind of vacuum to collect the used shot and material they have removed or it is done in a closed box/cabinet.
I liked your presentation, mate. It's easy to be seduced by pedantics such as grit blasting. For over 20 years I learned that the VIP element of being a capable Rust Doctor is [1] You must kill the rust stone dead. Imagine a stream of electrons emanating from a point on a steel plate. (It's a nano battery) . If you zoom in (in your mind's eye) you will see a pit (crater) with a tiny black dot down the bottom. That's what you've got to get out. Grit blasting won't remove chloride ions buried deep in a substrate, just push them in further. After you grit blast, watch it blush in a couple of hours. If you try to chemically 'convert' it, the whole surface will turn black. The most effective cure for killing rust is phosphoric acid 10 molar 9:1 diluted with water. Prove it by leaving it unattended for 6 months or so. Overcoat with Wattyl EPUP (olive green) 15% thinned with L760 applied by brush. Image you're fibreglassing and 'wet it out'. Do it once = do it only once. You would need to pay very particular attention to that area under the stern gland. If it was mine, I would replace that panel with 6mm 316. Good to watch a fellow marine enthusiast. Hope I haven't bored you with my didacticism. A good blast job will leave you in peace for a couple of years. That ultrasonic meter is good stuff. If you need a lesson in strengths of steel, watch a few Smit salvage videos. 3.6mm steel impregnated with ch+. ions can tear like wet cardboard with a force majeure.
Thanks mate, not boring at all. I have bought a bottle of Phosphoric acid from a local industrial cleaning place at a good price. It turned out he had a steel trawler too so we hit it off. :) I'm going to be using a Chlor-Rid and Hold-Blast when wet blasting the hull, but I do like the idea of doing a complete coat with Phosphoric acid afterwards. I was initially worried that it would stop the primer sticking but I believe as long as you lightly sand all the lose stuff off after painting it in the primer should stick well. Oh, and I *love* watching the SMIT salvage videos. :)
Thank you Checkline. When I'm ready for a tester....your my guys.
I was just looking at them, pretty expensive! Awesome tool, idk if it's a DIYer tool though :\
I watch these videos even though I know nothing about boats, keep up the great content!
He makes great videos! Nice 1V3 clutch on mirage, I haven't finished the Katowice matches yet :\
@@BornAgainBoating He does! thanks for the nice comment, I miss the days when I used to play counter-strike everyday with the bros lol (:
True story, I had a job I didnt know what to do and I was like "we'll just grind the welds and should pop off" it worked, I even said it with an accent
@@noone-ft9lw too funny
I've watched almost every video and now I know a little something about boats.
That was really interesting. I don't throw much about steel boats, but the surveying of the steel thickness was fascinating to me, thank you for sharing.
Great video. You are managing to provide real insights into your project without going into too much repetitive detail. Keep up the great work.
Cheers.
What a wonderful surprise! Best show in town, hope more people kick in to support this excellent adventure.
You would think there would be more companies sending tools for him to try and review!
That was really nice of the company to give it to you. I will look into one for myself. I told you not to get bummed out. People from around the world are pulling for you to do a great job and in the end have a good steel boat of your dreams. Thumbs up from the US :)
It was very nice and very helpful!
@@DangarMarine :)
1/8th inch thick. Battleships had 12, 14, sometimes 16 inches of protective steel plate on their hull! I guess Stu wont have to worry about torpedoes. Love the vids. Keep 'em coming.
Hopefully not!
Stu this project deserves it's own tv show. Great update as always 👍
Especially if he starts to needle gun that entire hull! Whoa! That's some serious commitment
😂😂😂 definitely 2 or 3 episodes on that alone
@@CorkRebel78 Hahhaha full length episodes even at an ultra speed.
To be honest though that probably would be pretty cool if you just sped up the entire thing and watched the transformation!
@@BornAgainBoating just subbed to your channel. I want daily videos of your boat 😂👍
@@CorkRebel78 Thank you so much! Hahaha it takes me forever to make the videos as is, I'm new to this lol.
Next video comes out tomorrow! Just put a tower on a 2019 36' Yellowfin :)
for your own records its good to have a sketch of the hull and keep a semi accurate diagram of where you have tested and those readings, makes life a hell of a lot easier a few years down the line, i manage a few charter boats some of which are steal and having to haul them out often but if u have records you can plan years ahead... happy needling brother, if you ever in zanzibar look me up , would love to buy you a beer...
"if you ever in zanzibar look me up , would love to buy you a beer..." Now THERE'S an invitation you don't see in every old comment …..
I was thinking along those same lines. When he set up his grid pattern and did the testing, if he'd marked the resulting thickness on the hull then taken a photo, it would come in handy later.
I spent several days of my life with the needle gun back by the shaft on the USNS Concord, on the island of Guam. I was listening to the BBC recording of Led Zeppelin on headset. Another thing we have in common. Thanks for the memories. You haven’t crawled thru the engine up to clean the smokestack yet, I’ll be blown away, when you do that. I have a nail gun. Hope I don’t have to use it again; but I’ll use your tip, to watch that little screw. Mate!
Ah, I know you miss that gun. ;)
The needlegun work is very satisfying to watch, seeing all the crap fly off.
I've got to the point now where I click 'like' before I even watch the video. I know it's going to be good stuff through and through.
14 people have clicked dislike at the moment. I don't understand why you would dislike a video like this. If your not interested in the content you just move on right? It's probably 14 competitors to Checkline that disliked ;)
What a great piece of kit. Can't think what I'd use it for but want one anyway. Love your videos despite not being a boat owner. Hope that heat wave is on the way out. We just had one in the UK. 20° centigrade in February, record! Look forward to the next one.
For what it's worth, about 20 years ago I worked on a grey ship that went into dry dock over at Garden Island. All the paint (plus attached marine life) was blasted from the bottom of the hull using wet blasting. The two part primer was then applied without further dry blasting for added key.
Good to know, thanks. :)
I'm eager to see the rest of the hull blastered and ready to paint, a real cliffhanger 😃
Great video Stu 👍
I can't wait to see it painted too!
Thanks for the video. I appreciate you taking us along on the adventure. Looks like you've lost a bit of weight. Don't spend all the money on the boat get some good food too!!!!!!
Glad you are making progress. Looking forward to the next few videos.
lol
A professional sandblasting guy told me that steel create rustflakes at a factor of about one to ten. Ie, if you see a layer of rustflakes about 5mm thick - the steel has lost about 0,5mm of its thickness. This is no scientific formula. I am sure the factor varies between different steels, cast iron and so forth. But the guy had 30+ years as a professional sandblaster behing him, and this method was what he used for quickly determining how much material was lost. Great content, as always.
Good to hear the basic ratio. The chunks I peeled off where about 1mm of rust and paint combined so I wasn't expecting to have lost too much steel.
I'm in mate! You got me hooked and I cant wait until the next video. Be safe and rock on!
As a seaman in the USN we had to strip the flight deck and fantail of a light cruiser. It had multiple coats of sandy non-skid and paint. We used pier supplied compressors, Jack hammers, needle guns, sanders, etc for several days. Years later I met a guy who berthed below the deck and he mentioned the noise!
LOL, I bet he did! :O
Thanks for sharing Stu, that tool has more uses than just boating I'd say. I'm a trucker here in the US and own a 1994 Mack CH since new. I could use that on parts of my truck and trailer.
I bet, you are almost entering "antique" status! Well, here in Florida it's 30 years but you're almost there, how many miles?
I give you tons of credit sir with regards to this steel boat project. I literally get anxiety watching you rip things apart and unravel issue after issue that needs to be fixed and it not even my boat or project to work on. ;😂.. You are doing an amazing job keeping at it because I think I'd have already given up. Keep up the amazing work sir..
Thanks mate. Come too far know to give up!
That was a great intro to ultrasonic thickness testing. Really useful.
I believe your hull going to be fine mate. Other than some rust and scale, the steel looks like it is in tact. You have a lot of cleanup ahead but it’s going to be worth the effort. Thanks for letting us look over your shoulder.
Another really good video Stu, glad the deck plate checked OK.
Here is a MT tester (magnetic partical). This can be used to check for cracks in welds. There is another way too. Dye penetrate which you apply the dye the use like a black light to find cracks. I'd prefer the MT, more fun and quick to use. Good for a video either way😎
Today is a good day. Cheers for getting the vid out.
Right, it's a little early in the week for a Dangar Video :) What a great day!
I don’t own a boat (though I’m very interested in sailing), but I so genuinely enjoy this channel and this project. Your kind character shines through and I admire your grit and willingness to try new processes in the spirit of learning - and teaching! Thank you for this.
Thanks mate, glad you've been enjoying the vids. :)
That needle gun brings back memories for me personally. I was in the Navy and needle guns were the paint maintenance go to tool. We also had deck crawlers for the flat horizontal surfaces. both did great work for paint prep. I wish I had a buck for every time I used one. That metal thickness tester is one of your best tools to use for hull survey too. Good job mate.
This is a great site for people like me who would love to be messing about with a boat but do not have one, or any water nearby.
Can't wait to see this all painted up and on the water.
AHA! The man does wear PPE! I just found this channel this week and caught up with the refurb series, I was worried you weren't wearing PPE during some of the more dangerous activities! Good stuff!
Keep watching, he gets going pretty wild sometimes and makes you wonder :) There was a couple times when he was setting it up that the boat was moving on the stands.... super sketchy!
Stumbled on this channel at the buy of the steel boat. Well done Stu...this has become oddly absorbing and hard to miss.
Good idea to buy a steel boat...irrelevant to me I just love watching the journey.
I have worked on both steel and timber trawlers...each have their good and bad points. One night though the timber trawler next to me outta Newcastle north of you ran up onto a shipping container. The impact would have mostly sunk the steel boat I was on. But hey...;-)
Shipping containers are such a hazard when they are washed of ship's decks. Glad the boat didn't sink!
Wet garnet sand blast. Use a service. The time saved offsets the seemingly higher cost. If you wet blast with your equipment make sure to use a ceramic tip or the garnet will blow through a steel tip.
Good on Checkline for supporting this project. Huge exposure.
well i'm just itchin to see this wet blast process and then the rest of the readings! Hats off to checkline for sending that along as it certainly gives you good data and obviously something worth having. LIke the comments below on the needle gun use...and that looks like "the" tool for that job. This is good stuff!! thanks again for sharing
That Check Line unit is impressive!
Great video. I love using the needle gun too. It is amazing how much they can do.
They do require a lot of time though :)
The hits just keep coming good shit stu👌
I would suggest that prior to painting your hull that you weld a stud to the hull near the stuffing box {one on each side of the box} then after you paint the hull, bolt some zinc anodes.
You can never have too many anodes on a steel hull! I wonder how corrosive the water is there where he lives? If it's anything like it is down here, he will need about 50 anodes!
Good idea 💡.
Ken Williams , sorry yes you can have to many zinc anodes
Can definitely have too many anodes. Will take patches of paint off. Should measure voltage with a silver cell.
Yep, will definitely be doing the silver half cell test once it is back in the water.
Congratulations on the birthday here from Denmark
Thanks CheckLine USA for helping this lad out
Great Vid Stu....& well done to Check Line for supporting you
Happy Birthday for yesterday Stu :) great mid-week update mate, quality viewing ... thanks That Checkline Pocket Rocket is certainly a nice bit of kit for the job at hand, 3.6mm sounds sweet to us owners of 40 year old alloy hulls my friend ! keep up the great work...you have a stack of new supporters here and they want more than Billy idol in 1983 rest assured :)
Thanks Mark! I'm pretty happy with that amount of steel being left in what is clearly one of the worst areas. :)
Fantastic episode!
Can vouch for the quality and accuracy of the Checkline tester. I hired one to inspect my compressor reservoirs for any wastage and found it so quick,easy and accurate to use. Best thing was it was acceptable to my insurance company to arty out the testing. Reservoirs were all good so happy days all round!
Love this series. Three cheers for sponsors!
I have always used a needle gun in combination with the angle grinder and wire brush. This was on a big river barge. Worked well I always thought. This way you can also just do small sections at a time. If you wait to long with bare metal you can get surface rust again especially if it suddenly starts to rain or if it is very humid. After wet blasting the metal, you might have to wipe it dry to avoid that as well.
Stueeyyyyyy. Killing it brotha. Loving this series man.
I inspect steel structures every now and then for work. The name of the game isn’t necessarily testing every square inch of a structure. Normally you’d find a certain area test it several times and as the results stay consistent you can check similar areas less closely unless you start to see inconsistency. So on the rail cars i inspect, I’ll check a crossmember in a common fail area. If it’s good all over, I’ll move on to the next ones, but only check them a few places. Like at each end and the middle, until I get to the next type of cross member and repeat. There’s no real need to check every square inch. You just loosen you’re checks every time you move on if everything checks out, unless you see something that causes concern.
Just offering some advice. Love the vids!
That makes sense. I guess because it was such a dodgy area I was interested to see if there was any sloping progression in thickness but the rest I won't do to the same resolution.
I don't know if anyone in Aus does soda-blasting, but if you want to remove rust without removing steel, that's the stuff.
It may be merely bicarbonate of soda but car restorers in the U.K use it on much more fragile panels than yours.
Keep going mate.
Oh the neighbors are going to love you lol might want to take frequent breaks from the scaling just to keep peace in the neighborhood . Here's hoping you continue to get good news as you press on
Enjoy these vids a lot just need more ,one a week not enough !
There might be two this week :) haven't seen a video on a Monday for awhile!
I'm really enjoying this series. I don't usually see a steel boat where I live.
this is so fascinating to watch. Cant wait to see the end result. Fantastic series Stu.
Super videos. This is a great combination of expertise, methodology and problem-solving techniques. Thanks!
Thanks Duncan, glad you like them. :)
Great that you have this useful tool, I remember working on the deep sea trawlers, we would work our nuts off all day to expose a crankshaft journal etc. For the surveyor to check......he would come along in his pristine white boiler suit, take out his toffee hammer, and after a couple of taps would wander back to wherever he came from!
Being a yard bird and familiar with ultrasonic testing, surface prep and coating, I only have one thing to say. Read the directions!
Thanks again for a very interesting episode about the easy laid back lifestyle of boat ownership
I need a thickness tester in my life. Very cool piece of kit.
Clicked on the checkline link and that guy in the demo video looks familiar. Great job Stu!!!
Another awesome vid Stu! Glad you decided to needle gun the boat yourself.
Saves a ton of money, nasty job though! We had to do that one time to repair the forks on our forklift. Used an Ingersoll Rand, which was an awesome gun, until it got destroyed in a hurricane :(
great vid, if you run out of coupling fluid wall paper paste wirks just fine too we use it at work!
Yeah...water and cellulose...
To do a really through hull evaluation, audiogauge readings are typically done on around a three inch grid. A great many points. This is combined with visual inspection for any deep pitted areas between the gauge readings. And as Mr. Jackson noted below, the gauge reading locations and thicknesses for each should be made into a chart for subsequent use. Greg
It is very true that a visual inspection shouldn't be discounted. It's amazing how many spots you can see that need attention.
So freaking glad you went with the needle gun rather than sand blasting :)
Excellent video thanks for producing
What a great idea ! Thanks, Check Line 👍
hope you had a great birthday stu all the best from us Brits great video cheers
Learning about what it takes to bring an older steel boat back to life is fascinating. Fiberglass hulls are more common where I live,
Testing beats regretting! Wish I had one of those when I was rebuilding a 24 foot drop deck trailer. Good luck with the rest of the hull!
Right, I wonder if they make others that can shoot different materials, like fiberglass!
Why don’t you just caliper the thickness on a trailer
Great videos, really like them!
Really happy the hull plate worked out to be OK... Onward and forward...
Not telling you what to do, but consider putting some sandbags on the inside of the hull when you are using the needle gun on the outside to cut the noise. It might help!
Not a bad idea!
That cuts down the rattle and ring or the plate a lot. One shop had totes of 20-30 pound sandbags that were used for this. They also were used to weight sheets down to form then to the deck framing.
No doubt about it, some damp sandbags would be perfect for deadening the ringing.
Yep, would definitely make a difference I reckon.
Well done .. Love to watch these vids
you arekillin' it Stu, love the videos.....looks like it's warm down there....I usually wouldn't be jealous of someone sweating their tail off but I just shoveled a foot of snow off my boat so I kinda am just a bit jealous. Good luck, hope you make heaps of progress this week!
Great to see the face shield Stu , great channel, legend.
Great video and good to know and learn...thanks
Excellent! My surveyor just did some random measurements. That is good to know how it was build but has no value for assessing the condition. Identifying the weak spots and measuring them is the way to go! On the Ex-Navy ship I volunteer we had Wet wood touching the hull plating in a galley. It went from 8mm to zero in a distance of 4 centimeter, and back to 8mm. Random test don't say much. I did use the needle scaler too for the bulk work so a light sand blasting was enough for keying the surface. I was limited to just 10Amp / 230V so I wasn't able to have enough air for pure sandblasting. Constantly Waiting for new Air pressure to build was a bit annoying but allowed me to catch my breath too :-)
I'm glad there isn't too much timber on this boat as I have heard that your problem is very common. I'm going to have a try doing some wet blasting soon which doesn't require anywhere near as much air, it will be interesting to see how it goes.
Great vid Stu That Check Line unit does a great job of measuring the thickness of the steel. Very interesting video
Great job. When I hauled boats on a commercial railway, there was inevitably a steel hulled shrimp boat being sand blasted. Following the blaster was a man spraying red oxide, which stopped the oxidation process before it started, and was the primer. Maybe your paint supplier could advise.
I wish I could travel from the States and help on this project. I’m ready to see it returned to its former glory.
Good job
it is almost impossible to find any YT videos on steel motor boats (NOT sailboats), this is one of only a few that I have found
It's been a super sweet series! I'm waiting to see the engine work :)
th-cam.com/channels/q9WQmB1GqfhPKkKFvFkY4A.html
Shorter hair works for you. Glad to see you have another sponsor. Looking forward to the blasting.
Thank you Checkline
Nice tool, very useful.