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Recent content by GL431

  1. GL431

    Column Depressurization

    The PSVs are supposed to never open as said by the posters above. The depressurisation valve normally operates at a pressure below the set point of the PSVs so that disturbances can be controlled away and the PSVs do not need to open. If a PSV actually opens, one would have the hassle of having...
  2. GL431

    Utilitities and 2/3 rule

    So often I come across heat exchangers in which the process side has a high design pressure and the utility side has a design pressure of 10 bar (150 psig). The utility side is often thermal oil or heating water. The process side invariably have operating pressures and therefore design pressures...
  3. GL431

    Induction Bends in 42" ASME B31.8 Pipeline

    Yes, that seems to be the most appropriate fix. 170 bends of which approximately 50% have too wide OD's (by 2mm). The construction contractor is probably going to make a casino out of this. Let us see whether he has the equipment to do it. Is this a normal event ("taper boring" or "tapper...
  4. GL431

    ASME section 1 and Pressure Equipment Directive

    Fawkes, you seem to be immersed in all this PED-EN stuff. There are some concepts mentioned in your post of which I cannot make head or tail. I apologise for asking you here and not going through all the material presented in your link. I would get lost in there. What is a "harmonised"...
  5. GL431

    Induction Bends in 42" ASME B31.8 Pipeline

    Thanks to both of you. I had the ISO 15590-1 sitting there on my computer, but it did not enter my mind to look for it. That is a problem if one is chasing standards in different systems. The ISO states a tolerance in the ballpark of the API 5L spec for line pipe (i.e. far stricter than the...
  6. GL431

    Induction Bends in 42" ASME B31.8 Pipeline

    I think I understand now. Thanks.
  7. GL431

    ASME section 1 and Pressure Equipment Directive

    Fawkes, what you have written corresponds to a large degree to what our notified body has told me a few days ago with respect to ASME Div 8 (pressure vessels). For pressure vessels in essence it would be easy. The pressure test needs to be adjusted as you have explained. For pressure vessels...
  8. GL431

    Induction Bends in 42" ASME B31.8 Pipeline

    BigInch, thanks for your reply. In my present case the actual wall thickness exceeds the minimum required by API 5L by far. The problem is in the outside diameter at the bevel. The actual is larger than what the + tolerance of API 5L would have allowed (by 4 mm on 42"). But it is within the...
  9. GL431

    Induction Bends in 42" ASME B31.8 Pipeline

    Which standards actually apply for the dimensional tolerances of the OD at the ends of induction bends to be used in an ASME B 31.8 42" pipeline? API 5L (43rd ed.) table 8 gives tolerances for the OD of pipe-ends, which are quite tight. I can see that these tolerances ar fine for straight pipe...
  10. GL431

    NDT of rig equipments

    O481 Do you have a photo of that rig? I assume it is a 50t , but I cannot find any details of the Romanian T50B on the web. It is for my own interest.
  11. GL431

    NDT of rig equipments

    There is a lot you can inspect! Is it an old rig, which has been in for service and has been repaired? --> API 4G. I found the CAODC (Canadian Association of Drilling Contractors) guidelines very useful for the structural elements of work-over rigs. The main emphasis on the rig structure will be...
  12. GL431

    Pumping hot liquid

    340°F is the boiling point at 103 psig. What is the purpose here? To evaporate water and concentrate the slurry? Or to soak the solids at 340°F with little evaporation of the water? For pumping at the boiling point, you have to ensure that you have sufficient NPSHA. I.e. the level control in...
  13. GL431

    Oil in water

    In some water-oil mixing processes a throttling valve is used to create a given pressure drop. The valve induces sufficient turbulence and shear forces to break up the water and oil phases into droplets small enough to allow intimate contact between the phases. I do not know whether this...
  14. GL431

    Auto-Ignition considerations?

    Bourbon, I cannot say whether the AIT comes down with increasing temperature (I thought it stays the same). But what interests me, is why AIT is a criterion in your case. I understand that the boiling temperature of heptane at 50 psig is 320F as you say. But as soon as the vapor exits from the...
  15. GL431

    Confused on static vs. dynamic pressure

    The concept of dynamic pressure is nicely illustrated by the working principle of pitot tubes (air plane air speed) and anubars. The pitot tube is bent into the direction from which the fluid is flowing (or into which the air plane is flying). It measures the dynamic pressure plus the static...
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