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  • Users: ayoung802
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  1. ayoung802

    Looknig for Simplex and Duplex Bilge and Fuel Manifolds

    Hello Eng-Tips, I'm currently having a huge problem with our vendor for Cast Simplex and Duplex bilge and fuel manifolds. They keep pushing out our delivery date, I'm too the breaking point because they were suppose deliever them in March, they keep pushing them back and today I get an e-mail...
  2. ayoung802

    Weld Heat, heat exchanger, heat sink paste

    In short I need to place fittings on a tank. No big deal if they weld the fittings on, then weld the tank in place followed by sandblasting and painting the inside of the steel tank. If only things could be that easy. The sandblasters and painters are ready to get started now and the welders...
  3. ayoung802

    Zinc cathodic protection calculations for aluminum hull in salt water

    I think the title pretty much says it all. I'm a mechanical engineer working in the marine industry so I have a basic understanding of corrosion and cathodic protection, but that is it. I'm trying to find information or a lead on how to calculate the number/size/amount of zincs I need to...
  4. ayoung802

    Key Terminology

    I've been asked to calculate the cracking area of a shaft key. What is the cracking area? I know the shear area is the length of the key times the width. Thanks in advance
  5. ayoung802

    Sequence Valve Chattering

    I've recently completed a large hydraulically actuated door on a yacht. I used a sequence valve to make it a two step process. The first step unlocks the dogging cylinders followed by the opening of the transom door. We have built similar doors in the past, but on a smaller scale with...
  6. ayoung802

    Flow Control Valve

    I am using a sequence valve with two cylinders, 1 small cylinder and 1 large cylinder. In order to extend the large cylinder in a reasonable time I have to have a large flow rate. The problem is the flow rate will be too high for the smaller cylinder. So my question is how can I slow down the...
  7. ayoung802

    New Hire / Mentors

    Hi I've been reading a lot of posts, have done a little posting myself and have found this forum and its members to be very helpful. I graduated in May '07 with a degree in Mechanical Engineering and recently started a new job building boats in Seattle. I came across an article on Training...
  8. ayoung802

    Dash Sizes

    So I have a hydraulic system with two cylinders that use a sequence valve. At the start I knew information about one cylinder that used an SAE-6 Fitting. Knowing that I picked a sequence valve that also used SAE-6 fittings, that could operate at the pressure and the flow rate I needed. I've...
  9. ayoung802

    Pin Design

    I found most of my answers on here, but one remains. When talking about shear pins .577 of the Ultimate Stress is used for the failure point. I'm specing a pin for a hydraulic cylinder, but I don't want it to fail or yield. Does that mean I should use .577 of the yield strength? Thank you in...
  10. ayoung802

    Guidelines for placement of a hydraulic cylinder

    This is my first post so thank you in advance for all replies. I've delt with fixed hydraulic cylinders before at my previous job, but at my current job things are a bit different. In short I'm using hydralic cylinders to open hatches on a boat, so both ends have a free rotating clevis...

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