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  • Users: TugboatEng
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  1. TugboatEng

    LED Light Degradation

    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...
  2. TugboatEng

    Hydrogen Embrittlement ASTM A574

    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...
  3. TugboatEng

    Rogue Climatologists

    I thought you this was fake news but apparently there is a company injecting sulfur dioxide into the upper atmosphere in order to cause global cooling. https://makesunsets.com/pages/contact I still didn't believe this could be true but sources more reputable than I have confirmed it...
  4. TugboatEng

    Sensor Selection for Measuring Timing

    I have an idea that involves using sound to detect the occurrence of certain events in a diesel engine. Specifically, I am looking to "hear" the rocker arm contact the valve stem, the valve closing in the seat, and the opening or the fuel nozzle. I would like to be able to do this through a thin...
  5. TugboatEng

    PTO Generator

    I have an idea that requires a generator that can produce 10-20kW of power over an available speed range of 650-1800 rpm, it's essentially the same application as an automotive alternator. I can use a step up gearbox if necessary. I eventually need it to be 480V 3 phase. I'm looking for guidance...
  6. TugboatEng

    BESS Fire Moss Landing

    One of the largest BESS facilities is on fire again. If it's Tesla's, this would be the 2nd time and if it's Vistra it's the 3rd time. However, this time the fire appears to be catastrophic. I was going to post this in the climate change forum but, considering the amount of taxpayer money...
  7. TugboatEng

    Hydrogen Embrittelment

    I showed up at our shop today to find my mechanic cleaning bolts in a phosphoric acid solution. Later, during assembly, two of the bolts yielded at ~50-75% of the torque spec. The bolt are class 10.9 M14 socket head capscrews. Is it possible that a 1 hour exposure to phophoric acid at 75%...
  8. TugboatEng

    Urea Tank

    I have some negative feelings on this project and am interested in other opinions. We have commissioned the construction of a tank that will hold 32% urea solution at ambient conditions. The tank is constructed from 3/8" 304 stainless. It is being constructed near carbon steel fabrication. The...
  9. TugboatEng

    Data Storage Costs

    I've been curious lately about the CO2 cost of data storage. I tried to Google it and it's people talking about mWEe to send an email so now I know they're BSing. Some try to say that 35% of the electricity is renewable, even. All of the numbers are rates with no time quotient. My question is...
  10. TugboatEng

    Overture Boom

    I wanted to put this in one of the aerospace groups but I'll let those stay technical. Is my understanding correct that aerodynamics and flight characteristics don't scale? I know this is true for boats in water. If my understanding is correct, building small flying models does not contribute...
  11. TugboatEng

    IEC Contactor with Transformer

    I have an IEC motor starter running at 480 volts and want to add remote controls and don't enter to use 480V for control. Is there a starter that has a built in control transformer? I would like a solution with a similar footprint to the contractor only so I can install it in the original enclosure.
  12. TugboatEng

    Cetane and Power

    Let's say I have a compression ignition engine and I double the cetane of the fuel it normally runs on. Is it possible that the shorter ignition delay of high cetane fuels may reduce power at lower engine speeds with a fixed injection quantity and timing?
  13. TugboatEng

    Propeller Pitch Distribution

    My application isn't a pump but it's similar. Propeller on my boats are distributed pitch props in nozzles. I am having an issue where the low speed load from the prop is too high. Typically to reduce load, one would re-pitch the prop but that would also reduce the high speed thrust. This is a...
  14. TugboatEng

    Ramp Generator

    I'm looking for a device that I can mount online of a 4-20mA control signal that delays rising values. The closest item I can come up with is a ramp generator but that only ramps up from step. I need it to slow a rising input. This is to limit engine acceleration rates to reduce smoking of a...
  15. TugboatEng

    Exhaust Duct Engineer

    I have an upcoming project that requires an offset in some 16 inch pipe but don't have room for two 90° elbows. I believe this can be achieved using rectangular ducting but there are complications of very high vibration and rapid temperature cycling of up to 1000°F within minutes. What type of...
  16. TugboatEng

    Hydrogen Chloride Formation

    Can hydrogen chloride be formed if sea water is present during a combustion process? I'm thinking about dissociation. More directly, is it possible to have hydrogen chloride present in the exhaust of a diesel engine operating in a marine environment?
  17. TugboatEng

    Cavitation Erosion Particle Size

    I have a high pressure piston type pump that is experiencing supply line cavitation erosion. Has anyone experienced wear or damage to a pump from erosion of the supply piping? I found this article which describes large amounts of particles in the 8-20 micron region which are much larger than the...
  18. TugboatEng

    Selective Catalytic Reduction Catalyst Regeneration

    I'm new to this SCR business with DEF for NOx reduction. It's proving to be quite the annoyance to my very low lifetime load cycle engines in my fleet. My engine manufacturer is asking me to operate my engines for hours at a time st full power to burn out deposits in the catalyst. This consumes...
  19. TugboatEng

    Pitting of Stainless Steels

    Who is going to tell them? https://phys.org/news/2024-03-uncover-culprits-pitting-corrosion-3d.amp I know this is a bit out of place but it seems we all need a refresher on the weaknesses or stainless steel from time to time. I wonder who it was that attached the description of "marine grade"...
  20. TugboatEng

    EVs and Particulate Emissions

    I would have posted to the old thread but it's closed. Original thread: https://www.eng-tips.com/viewthread.cfm?qid=493416 Here is some affirmation of my previous suspicion about EVs and it's worse than I thought. 1850x the particulate emissions from all EVs vs all combustion powered...

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