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  1. BenMacier

    GRE PIPE MINIMUM THICKNESS CALCULATION ISO 14692

    Like for any pipe wall thickness calculation, the codes require to consider the various stresses the pipe will be subject to during transportation, installation and operation (some also include decommissioning). You can use GRE pipe manufacturer tables to select the usable thickness...
  2. BenMacier

    Leak pressure testing EN 378-2

    EN 378-2 defines up to 3 methods to perform the pressure resistance test. Each method has a different test pressure: 1.43x or 3x or 2x service pressure. For the pressure limit devices (safety relief valves), the device has to be set below or equal to 1x service pressure, and open at a pressure...
  3. BenMacier

    Why Chilled Water Supply Should be Under 5°C/42°F?

    Why do they need to cool the air that much? * Finding a solution is great * Knowing how to implement it is fantastic * Believing it is the only one and best is naive ?
  4. BenMacier

    Galvanic Corrosion

    Dear experts, We have produced slender anodes and the project is on hold until further notice, so we have to store these anodes outdoor because nobody wants to pay for indoor storage. The project still wants to keep these anodes and everybody is wondering how we can use them in a couple of...
  5. BenMacier

    Weld repair to pitting on API 5L X65 pipe flange

    If this is an API flange, likely to API 6A, weld repairs would only be allowed on weld fabricated ones. In your description this is not an acceptable weld repair, but should be considered a weld overlay to recharge the thickness of the flange face. * Finding a solution is great * Knowing how...
  6. BenMacier

    pipe manufacturing tolerances

    This pipe must be manufactured to a standard (API 5L, ISO 3183, DNV-GL, GOST, etc). The dimensional tolerances are defined in this standard. * Finding a solution is great * Knowing how to implement it is fantastic * Believing it is the only one and best is naive ?
  7. BenMacier

    a cross river pipeline hydrostatic test.

    If it's a backup for an existing pipeline, it was aimed to stay clean (was it sealed properly?) and undamaged for the same lifetime as the main pipeline. Avoiding any inspection, even basic visual, before putting it into service is looking for troubles. Is there access from both ends? If so...
  8. BenMacier

    Charpy impact value for welded super duplex stainless steel

    I wouldn't worry about weld metal because weld consumables are over alloyed and result in enhanced properties. However the HAZ being a mix of both and will be weaker. * Finding a solution is great * Knowing how to implement it is fantastic * Believing it is the only one and best is naive ?
  9. BenMacier

    Manufacturing of Welded Fitting A860 X65 With TMCP Plate

    As the standard highlights, it's highly chemistry dependent. Could you please post the ladle analyse of the plate? * Finding a solution is great * Knowing how to implement it is fantastic * Believing it is the only one and best is naive ?
  10. BenMacier

    Corrosion allowance for Bare Carbon Steel in Caustic Service of Alumina Refinery

    It's almost zero because the pipe schedule will include some sacrificial allowance. In caustic environment (pH > 8) carbon steel will passivate by creating a stable oxide. More stable than in acidic environment. * Finding a solution is great * Knowing how to implement it is fantastic *...
  11. BenMacier

    Leak pressure testing EN 378-2

    First stop using acronyms you don't define : HP = Heat Pump = High Pressure? In your case of high pressure switch set at 40 bar to switch off the heat pump, the safety pressure relief valve is set just above it to discharge over pressure and prevent catastrophic failure of the pump circuit...
  12. BenMacier

    Hvac docs on control algorithm

    Understand first the basics here http://www.electrical-knowhow.com/2012/04/hvac-control-systems-and-building.html?m=1 Then you can decide which specific system you want to learn more about. * Finding a solution is great * Knowing how to implement it is fantastic * Believing it is the only one...
  13. BenMacier

    Piping Fitting Leak / Corrosion issue...

    If it doesn't happen on all units of the same domestic hot water system, what differ between these units? Their location in the system? Floor level? Temperature regime? Installation period? Usage? All these materials are fairly compatible to each other in domestic systems. So what is the...
  14. BenMacier

    About Mascoat against CUI

    Apply phenolic epoxy layer properly under the insulation and it will provide also a long term primer protection. Leaving metallic surfaces bare under non adhesive insulation is looking for corrosion troubles (but some people like it because this is obsolescence and this is their business...
  15. BenMacier

    steel plate emdeded in reinforced concrete

    The weld metal used will be slightly different (more noble due to additional alloys) from the plate and rebar steel materials. However once embedded into concrete, water ingress is difficult (unless the concrete is porous, i.e. badly made and poured). Also the anode to cathode ratio is at the...
  16. BenMacier

    Need Info on moisture trapped in roof systems due to insulation.

    You can predict this risk of condensation considering indoor/outdoir conditions with a software like BuildDesk U. * Finding a solution is great * Knowing how to implement it is fantastic * Believing it is the only one and best is naive ?
  17. BenMacier

    Tablets for sketching and mark ups

    The IT helpdesk recommended Archos tablet. * Finding a solution is great * Knowing how to implement it is fantastic * Believing it is the only one and best is naive ?
  18. BenMacier

    Hydraulic cylinder piston rod plating

    ISO 12944 all parts * Finding a solution is great * Knowing how to implement it is fantastic * Believing it is the only one and best is naive ?
  19. BenMacier

    2mx2m 11kV cable tunnel -ventilation method

    Natural and weatherproof. Easy and simple, always. * Finding a solution is great * Knowing how to implement it is fantastic * Believing it is the only one and best is naive ?
  20. BenMacier

    Costs of Painting versus Grit blasting

    To obtain the same silver finish as painting, you will need multiple passes of blasting (grit/shot various mixes). So the overall cost would not be much different! * Finding a solution is great * Knowing how to implement it is fantastic * Believing it is the only one and best is naive ?

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