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Recent content by subtechy

  1. subtechy

    Pressure up tapered casing and set packer

    Hi all, I have come across a wee problem that has really got me scratching my head. Not only because I cant solve it, but I can't even think on where to start for a reference. I have a casing string that will have a casing packer set behind it. The casing string is tapered from 10.75" to...
  2. subtechy

    Pressurising tubing and locking in stress

    Hi all, I have come across a wee problem that has really got me scratching my head. Not only because I cant solve it, but I can't even think on where to start for a reference. I have a casing string that will have a casing packer set behind it. The casing string is tapered from 10.75" to...
  3. subtechy

    Heat Transfer through a Pipe Wall

    Ok, here's the deal......I was never top notch with thermodynamics at Uni but have now been faced with a heat transfer problem. We have a piece of tubing (slick joint) within a BOP stack that we are flowing oil through. The BOP rams are restricted to 180degF and we therefore have to ensure...
  4. subtechy

    Ethylene Glycol Freezing Point with Water

    Many thanks, some great information here for future reference.
  5. subtechy

    Ethylene Glycol Freezing Point with Water

    Thats excellent, that has certainly pointed me in the right direction for doing some reading. Many thanks
  6. subtechy

    Ethylene Glycol Freezing Point with Water

    This was one of the sites I looked at yesterday and lo and behold, there is no temperatures given for above a 60% concentration. I have attached a table and graph I downloaded and plotted yesterday that shows the trend after a 70%...
  7. subtechy

    Ethylene Glycol Freezing Point with Water

    Hi all, I have a query regarding the characterisitics of Ethylene Glycol when diluted with water. Apologies in advance if there is a simple explanation to this, I have a mechanical background and chemistry was never really my strength. We regularly use glycol for pressure testing with water...
  8. subtechy

    Pre Perforated Pipe

    I need to find out what the residual tensile and torsional strength of 5” 18ppf P110 liner if it is pre-drilled with 36 holes/foot, 0.5” diameter holes and 45 deg phasing. I am happy with determining the tensile strength of the liner however the torsional capacity is what is throwing me. I have...
  9. subtechy

    13Cr and F6NM Cast or forged

    Can anybody halp me with regard to the manufacturing process of the above 2 materials 13Cr(S42000) and F6NM(ASTM 182/ UNS S42400) . I understand that the 2 materials are similar although F6NM has the addition of Nickel and Molybdenum. Are these materials cast or forged or can they be both...
  10. subtechy

    AC-95 Material

    In addition to this, I have also found other alternatives such as HC-95 and C-95. What do these letters refer to??? Can anybody point me in the right direction?
  11. subtechy

    AC-95 Material

    Can anybody tell me what the AC refers to in the material name and also what determines whether it is suitable for H2S service please. I am sort of familiar with the T-95 material and understand that the hardness value pertains to the NACE standard. Is it something to do with the Carbon content...
  12. subtechy

    HVOF Spray Coating

    We use a company at the moment to repair our valve components with the above mentioned process. The most common of the coatings being tungsten carbide. Our problem is that the companies spray application can only handle outside diameters and internal diameters of fairly small depths from the end...
  13. subtechy

    English Buttress Thread Shear Area

    All, Looking for advice on a thread which took an absolute age to track down. As the title describes, it is an English Buttress thread. Before you start panicking, this is based on the traditional American Buttress thread and has 7deg and 45deg angles on the thread. The thread being designed to...
  14. subtechy

    Step down transformers

    My friend has taken a fridge freezer back from the States with him. Beautiful machine, Ice maker etc and he doesn't want to get rid of it. It is rated at 115Volts 60Hz. He has been told that the only step down transformer he can get operates at 50Hz. My understanding has always been that 50Hz is...
  15. subtechy

    The velocity of an object falling through tubing filled with sea water

    Prex, This is a real life problem, a crown plug was dropped from 100' through tubing onto one of our closed valves. I am trying to determine the resultant force the plug would invoke onto the valve to prove to a client that it would be sufficient enough to cause noticeable damage. The ID of the...

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