I recently asked these questions. I have some 304L SS urea tanks that were welded using backup bars in the tank top. They're also skip welded on the baffles. The assurance is that urea has essentially zero chloride content. Urea isn't as corrosive as most people think. Don't use mild steel and...
It appears you're using a cylinder liner. MX bike manufacturers stopped using liners in the mid-1980's for a reason. Is there a reason you want to walk so far backwards?
The nozzle has 3 attachment points, two struts and a flange at the top. All 3 points have a history of fastener failures. It's worse on some vessels than others. We have 3 identical vessels now totalling 6 units.
With the flanges and counterbores corroded I cannot guarantee no perpendicularity...
I'm working with a local supplier. They can source custom bolts but I've only given them one week. We're going to install what we can get with some method of sealing for the threads and under the heads and then perimeter weld the flanges. They were welded previously and both the bolts and welds...
I am starting to divest myself from anti-seize. It should be called anti-gall. I find greases provide better seize prevention as they contain more oils that protect surfaces from corrosion. Anti-seize is mostly powdered EP lubricants with a little oil to make them sticky. Avoid the soap...
Yes there is sea water exposure. The flanges and counterbores are corroded so sealing is no longer ideal. There is surprisingly little corrosion on the bolts considering the conditions. I am going to heed MintJulep's advice but cannot find zinc-aluminum flake fasteners on short notice larger...
I think this is an example of the frog and a pot of boiling water. The boat went on charter and when it came back the change was instantly noticeable. All of the other fixtures we have converted are slowly dimming at the same rate but the change is less noticeable due to seeing it every day...
Now that LED fixtures have been common for some time, is anyone else having issues with reduced light output over time? How are you managing or planning for this? Install extra fixtures and dial up the dimmer as they fade? We did a round of newbuild boats that were outfitted with linear LED...
You need to fire it at a high enough temperature to vitrify it. You may be able to do this with a small propane torch considering the small size of your part.
Polypropylene is the least problematic and lowest cost tank type. You will need to prevent temperatures from dropping below 40°F. In my region that's not a problem, even without insulation. Urea is non-conductive so you can't use galvanic or impressed current corrosion protection. The tank needs...
It seems that the best reason to redesign such a flange is to prevent substitution do to specific environmental exposure risks. I don't know that this is substantial enough to be considered a capstone project.
There will most likely be a class action. Class action protects the involved party from any future litigation. Two things must happen. The guilty have to agree on what they're willing to pay and the law firm has to accept 30% of that number. The victims will get what they get.
Space adaptation syndrome apparently occurs in half of people that travel into space. These are specially selected people to be the least likely to experience these problems. There is no chance commercial space travel has any commercial viability.
Stress corrosion cracking, ISO 898-1 calls this out as a problem for these fasteners. The zinc-aluminum flake coating sounds like a very good solution and should be commercially available. I will pursue this route.
Today I have inherited several vessels with obsolete drive units and no factory support. The drives have submerged.structural flanges and are notorious for breaking bolts. 30 years later, I think it's time to look into a cause. The fastener are socket head caps screws of ASTM A574 standard and...
Waross, I'll have to to some digging. I had project that reduced ratings from 125/150kW to 99kW. The BSFC went up significantly going from 125/150kW down to 99kw. The engine size was reduced from 8.1L to 4.5L. The trouble is that the engine manufacturer only publishes BSFC down to 25% of rated...
