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  • Users: vinhermes
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  1. vinhermes

    Autocad Hydraulic symbol library

    Hello to all, I have been looking around for a library of hydraulic symbols to be used in Autocad but I could not find what I was looking for. Eaton seemed to have an AutoCAD add-on but it does not work with modern versions of ACAD. Does anyone of you have this sort of library that would be of...
  2. vinhermes

    Ventilation flowrate for concentration limits

    Good morning to all, I have a question about ventilation flowrate definition in order to stay below a concentration threshold during a leakage scenario. In concrete words, we have a room of 24 m3 that contains hydrogen fuel cells. The gaseous hydrogen maximum flow rate in the pipe is 4370 m3/h...
  3. vinhermes

    Sizing a priming unit

    Hello to all, I am currently sitting on a problem. On a ship currently under trials, we are facing seawater cooling pumps that are de-priming on the main engines. The pumps level is exactly at the seawater level and they are fitted with priming unit (rubber turbine in parallel of the pump)...
  4. vinhermes

    Dyamic calculations / Heating // Cooling ramps

    Good morning to you all, For a series of ships (tugs) actually being built, I am facing an HVAC engineering issue. To start with, I should say that we only do steady-state calculations using ISO 7547, SNAME T&R Bulletin 4-16 or equivalent. In other words, for technical rooms, we calculate...
  5. vinhermes

    Seawater piping anode sizing

    Good day gents, I have been looking through various threads but can not find an answer to my query. I am trying to determine the required zinc anodes on a galvanised steel seawater piping inside a ship. It does not need to be a very refined calculation as I am only looking at a ball park...
  6. vinhermes

    Clutch pump supplier

    Dear All, I don't think that my request is against the rules of these forums (as this is not promoting nor selling) but if this is the case, I am really sorry. I am looking for a centrifugal pump, to be mounted on a ship, with the following particulars: - Capacity: 25m3/h - Head: 43 meters -...
  7. vinhermes

    Pressure required for domestic applications

    Dear all, In order to size a freshwater pressure set for a ship, I am looking for typical figures for the required residual pressure at a water tap,shower, etc. I could not find this on suppliers' datasheets. Client's specification states that 3 bar shall be available for the user (that I...
  8. vinhermes

    Pump pressure/outlet pressure

    Dear All, Small brain cramp today... This will seem obvious to many of you but it is not clear for me. So, the components to determine the pump required pressure (for a given flow rate) is: - static head - friction (pipe & fitting) - velocity head (ignored on my case) But do I need to add...
  9. vinhermes

    Open pipe discharge distance

    Dear All, I have made researches via our Google friend but could not find an answer that suits me. Either way too simplified to take full account of all the parameters or way too complicated for what does not seem like rocket science. Knowing flow rate, pressure, diameter, pipe angle, pipe...
  10. vinhermes

    MLC, MWC, meter head, etc.

    Dear Community, I have made a vb.net application allowing me to get pipe and fittings losses. From here, all is good. I am using either Darcy laminar equation or Serghide's explicit solution for the Colebrook equation when relevant. From here, all is still good and results comparisons with...
  11. vinhermes

    UD enclosed within laminate

    Hello, This may be a silly question for you but looking at laminate drawings for a hi-tech carbon fibre foam core boat (catamaran 30m) I have realised that when using uni directional reinforcements for local loads, the structural engineers always enclose the UD in the nominal laminate...
  12. vinhermes

    Stacking sequence & moment of inertia

    Hello, Quick question fairly simple for most of you but I am confused. In the following sentences, please assume that E is the Young Modulus (MPa), I the second moment of inertia (mm4), t the thickness in mm and h the distance of the ply from the neutral axis. To determine the EI value of a...
  13. vinhermes

    Spreadsheet on composites properties

    Dear All, First of all thank you for all the information this forum has provided me. This is my first post as I have just been graduated in Naval Architecture; so I am not a composites expert but can expect to design parts at some point. It is very hard to find free spreadsheets on the...

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