tigerhead
Petty Officer
Posts: 232
Sea Pro model and year: SV2100CC 2000
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Post by tigerhead on Nov 3, 2017 18:53:55 GMT -6
I don't know how they look for cracks in engine blocks. When we look for cracks in pressure vessels we use several inspection techniques depending on whether we think the cracks come to the surface or not and if we want to size the cracks or not. The machine I'm referring to just measures the distance from the OD surface of the metal to the ID surface. If they are utilizing an inspection company to look for cracks in the engine blocks, it's very likely that the same technicians have access to an ultrasonic digital thickness meter that they can use to inspect your axles for ID corrosion. All it amounts to is taking some thickness readings along the bottom side of the axle to see if it has been thinned by corrosion. The hammer test gives you some indication of whether or not the metal is reasonably thick. The test I'm referring to will tell you if you have any corrosion going on. They can essentially see the pitting based on inconsistent thickness readings. If the metal is 1/4" thick in one spot and 1/8" thick in another, you have corrosion going on.
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mosquito13
Lieutenant
Posts: 788
Location: the other West Coast
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Post by mosquito13 on Nov 4, 2017 6:30:43 GMT -6
There was and is corrosion going on. Thanks for the insight, I will spray some ankor wax inside the axles . Have a half gallon left from a rat rod project that I went for the preserved rusty look on( www.morrislubricants.co.uk/ankor-wax-preservative-fluid.html ) . Was planning on trying a couple cans of por15's cavity coater on the frame stiffeners I am welding on my 64 Dodge. If I ever get into a actually new trailer the axles will get the full treatment before they see water. I send the blocks off to get hot tanked, tested and milled. Never went up to watch the work. What did you charge for this scanning service? I was kind of a on a ball peen budget on this trailer.
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tigerhead
Petty Officer
Posts: 232
Sea Pro model and year: SV2100CC 2000
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Post by tigerhead on Nov 4, 2017 16:08:24 GMT -6
Understand ball peen budget. Many years ago that was how they tested pressure vessels for corrosion thinning. I've read many inspection narratives from the late 40's, early 50's that were a one liner, "HT OK" (Hammer Test OK). Better than nothing for sure.
I didn't perform the scans. I actually just retired last April, but I was a pressure vessel/piping inspector for Shell Oil. We would hire inspection contractors to perform the scans. The cost was somewhere around $60 to $100/hr for the simple stuff. But the technicians usually have that type of equipment on their truck, and there is no cost to anyone if they were to do you a freebie. It's not like shooting an x-ray where you have the cost of the film and chemicals. An NDE (Non Destructive Examination) technician is a good friend to have. If you know anyone in the vessel or piping fabrication business, they are definitely using NDE techs to examine their welds. Could be a potential hook-up to get a favor. It's fast and easy to do. The worst part is having to crawl underneath the boat if it's on the trailer at the time.
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Post by captduck on Jan 23, 2018 8:00:30 GMT -6
Those needle scalers work miracles with rusty parts! We go thru quite a few of those a year on our work boats!!! Better have some ear protection when using them!!!!!!!
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Post by freezerfiller on Jan 23, 2018 22:32:44 GMT -6
Nice job Skeeter!
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Post by Simple Man on Jan 24, 2018 13:00:06 GMT -6
I've spent some time on a needle gun. Fun...😟
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fraydknot
Master Chief
Life is a collection of Memories.
Posts: 384
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Post by fraydknot on Jan 24, 2018 19:29:36 GMT -6
Looks great
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