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  1. GD2

    Closed Loop Piping-Vacuum Issue

    OP, Looks like the schematic is not complete. I am wondering where is the purge valve and how it will be controlled/commanded? As Doug has pointed out there will be air in the system from various sources ( I would add leak to it) and you must have a design in place to automatically test the...
  2. GD2

    Tie-In Issue: 10”x10S SS316L to 24”x10S SS316L – Weld Clearance & Flange Type

    Concept 02 looks fine to me. Although there is no explicit statement on distance between weld joints by any Code, it is generally be recommended to follow the 4x rule, i.e The minimum distance between welds should be at least four times the thickness of the thinner part joined, but not less than...
  3. GD2

    Practical Implications of Impact Testing

    I don't think you got it right. When you order materials, you should ask for impact test, if the material is not impact tested by default.
  4. GD2

    Practical Implications of Impact Testing

    I don't think it is mandatory to have killed steel for low temp service, but preferred as killed steel improves the toughness.
  5. GD2

    Practical Implications of Impact Testing

    Why historical? You know with modern steel mills, steel manufacturing process have changed, and also it's quality. You need to make sure that you test the material you are going to install. It goes by Heat No. You might get away without impact testing, if you follow the rules of Para 323.2.2. It...
  6. GD2

    Deflection of plastic pipe

    You need to evaluate what implication it will have by the process fluid on the piping. Where isolation and draining/ventings are required for maintenance and repair work, will it be safe to work? Think about a toxic material the piping is carrying. You may also encounter issues with gravity flow...
  7. GD2

    Practical Implications of Impact Testing

    Ok. Let me try my best to explain this. Doing an impact test doesn't change the material property, rather it provides the confidence that the material will have enough toughness at the tested temperature (typically this will be the Test MDMT). This is built on the premise that some CS and low...
  8. GD2

    Practical Implications of Impact Testing

    The answer is simple. You will ask for impact tested materials at the time of order. Impact testing is determined by the process/mechanical determined MDMT. It's a design parameter. Once you know the MDMT, you can use Fig. 323.2.2-1 to determine is an impact test will be required for the base...
  9. GD2

    Connection Between Tanks

    OP, There are so many reasons why tanks are interconnected. Ask AI and it will tell you. Another design case is limiting the fire or explosion, in case a tank goes on fire. It will allow to reduce the inventory by transferring it to other tanks.
  10. GD2

    Closed Loop Piping-Vacuum Issue

    Is there a reason the pump inlet has to be from the top of the sump? If you flip, the lines (pump draws from the bottom and cooled oil delivered at the top), the pump will not only avoid any vacuum condition but will also have reduced work done (backpressure will be reduced).
  11. GD2

    allowable stress value in creep region for 1.0345

    OP, Your interpretation looks to be somewhat incorrect. Your design life you said is 200,000 hours. Reference to Table 5.3.2-1 at t=200,000 h, and Table A.1, Design stress calculated at 100, 000 h = 66 Mpa/1.5 = 44 Mpa. Design stress calculated at 200,000 h = 56 Mpa/1.25 = 44.8 Mpa Both criteria...
  12. GD2

    allowable stress value in creep region for 1.0345

    Couple of questions for you: 1. What's the design temperature for the service? 2. Did you pass/check Notes (c) and (d) in table 5.3.2-1 in order to apply the safety factors? 3. What rule did you apply to extrapolate the values in yellow - Equation 5.3.2-1? 4. Have you thought about why Caesar...
  13. GD2

    allowable stress value in creep region for 1.0345

    This is weird. Normally, allowable rupture stress lines parallel with the highest allowable stress for the least design life, with decreasing stress value with increasing design life. Table A.1 looks to be correct.
  14. GD2

    Compensating pressure in Cryogenic Storage Tank

    Think about putting a pressure regulator with a relief valve that will regulate the flow to keep the tank pressure almost constant. The relief valve will help in case the tank pressure goes up.
  15. GD2

    Compensating pressure in Cryogenic Storage Tank

    Hi LittleInch, When liquid CO2 is offloaded from a storage tank, the tank pressure will initially decrease due to the removal of the liquid CO2, which contributes to the overall pressure within the tank. However, as the liquid CO2 is removed, some of it will vaporize (turn into gas) to maintain...
  16. GD2

    Compensating pressure in Cryogenic Storage Tank

    OP, If your tank operating conditions are correct (14 bara at -31C), this condition is very near to the liquid-vapour transition. A small drop in pressure will most likely change the liquid CO2 to gaseous state, NOT solid (dry-ice) (refer to any carbon-dioxide pressure-temperature diagram). It...
  17. GD2

    seasonal above ground water line for farm use

    This is where things might go expensive. Friction loss can be reduced with larger dia pipes. Do you want to do a cost-benefit analysis between installing the storage tank at your yard running smaller pipes vs locating at 1750' away with larger pipes?
  18. GD2

    seasonal above ground water line for farm use

    Littleinch, I think this problem can be solved by sizing the tank adequately with enough volume so that the feedstocks are not left thirsty. The level float simply works to close the water supply from overflow but don't have the functionality to start the pump when the level falls. The storage...
  19. GD2

    seasonal above ground water line for farm use

    OP, I have some design queries here. You want to use the well pump to supply water to your home and the feedstock. The pump should supply water to a bladder tank for the home and an atmospheric tank (storage tank) for the feedstock. The control of the pump is set by the bladder tank pressure -...
  20. GD2

    seasonal above ground water line for farm use

    Are you talking about the gravity flow from the Storage Tank to the Stock Tank? That's what I see.

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