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Recent content by GD2

  1. 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...
  2. 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...
  3. 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?
  4. 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...
  5. 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 -...
  6. 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.
  7. GD2

    seasonal above ground water line for farm use

    OP, Before we go further to the design, couple of thoughts from me: 1. What type of systems you plan to build - closed vs open type? Open means water continuously flows to the trough, closed meaning a valve will be used at the user point. 2. There will be two tanks, one (called Header Tank) to...
  8. GD2

    Pipe wall thickness calculation method for t≥D/6 or for P/SE>0.385

    A comparable analogy can be found in ASME Sec VIII Div 1 Mandatory Appendix 1 for Cylindrical Shell.
  9. GD2

    Can Service Pressure Exceed Design Pressure?

    OP, Your question only applies to ASME Sec III, not Sec VIII. Design criteria for both Sections are different.
  10. GD2

    Vessel for Hydrotest over MAWP

    OP, You are confused. Customer's vessel with 2660psi at 700°F will have a higher hydrotest pressure. The heater Design pressure is 2500 psi at 700°F. Where is the issue? Hydrotest pressure of the vessel will be= 1.3 MAWP x LSR .
  11. GD2

    Can Service Pressure Exceed Design Pressure?

    ASME Section III defines different service levels (A, B, C, D) that represent varying levels of loading and stress. Service level A (which is normal operating condition) occurs most frequently while level D occurs least frequently. Consider a piping system designed for a specific operating...
  12. GD2

    Primary Membrane Stress Range for Thermal Stress Ratchet

    No, it's not a stress range. By definition, Pm is derived from the average value across the thickness of the section from internal pressure and other mechanical loads, excludes secondary and peak stresses. Both Pm and Sy are to be determined at the average temperature of the cycle.
  13. GD2

    B31.3 (2024) fig. 323.2.2-1 note 1 min temp of blinds/blanks w/o impact testing

    Stress distribution in a flat plate is more uniform than a cylindrical vessel. A major contributor shear stress in cylindrical vessel has also minor impact in flat plates. The 1/4 thickness rule by the code is a conservative measure for flatheads and tube sheets for the reduced stress.
  14. GD2

    Nozzle load calculation

    OP, Piping Codes directs designer to follow ASCE Code for seismic design. The ASCE Code provide guidance for designing piping systems that can withstand seismic forces. These codes specify requirements for seismic forces, support systems, and other design elements. Seismic support systems...
  15. GD2

    Vertical pipe support load

    Tony, I am curious about the 1600ft pipe itself and the 6 meters spaced horizontal supports: 1. The pipe will see an increased hydrostatic head from top to bottom (imagine static head) - naturally, the pipe wall thickness has to increase with the depth - similar to a storage tank shell thk. 2...
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