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  • Users: ZDawg
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  1. ZDawg

    API 2C Cylinder Design - Offboard Loading

    In terms of API 2C cylinder design requirements, spec states "Cylinders shall be designed using the force induced by the loads specified in Section 5". This simply states loads and does not specify which load. Section 5 is the breakdown of all loading (onboard, offboard, side, etc). For an...
  2. ZDawg

    Common Operations Practice: Actuated Gate Valve Stroke Time

    Thank you for the info. 60 seconds for a 30" valve is much faster than they were talking about in the last meeting I had. They had mentioned some of the older projects were done with stroke times of 230 seconds. If we can get them to go to the manufacturer with even half that, it shouldn't be...
  3. ZDawg

    Common Operations Practice: Actuated Gate Valve Stroke Time

    Good morning all. I have looked everywhere and found nothing apart from resources to calculate specific times for actuators and warnings when doing so to determine the closing time for an actuated gate valve. I am trying to find notes from people either in operation or those that work with...
  4. ZDawg

    Hand Calc. Against Caesar II Flange Analysis?

    Has anyone else done any type of hand calculation against CII's flange analysis program? I do a lot of work with larger diameter flanges made from high yield materials which are designed from MSS SP-44. I started doing some research and found that through ASME Sec VIII Dev I & II you can tie...
  5. ZDawg

    Class 1 Branch Flexibility: Allowed within B31.8?

    Good day all! I've recently learned about the Class 1 Branch flexibility option available within CAESAR and after several examples and reading through the explanation of its applicability I had one question: Is the class 1 branch flexibility option allowable within B31.8? I have read through...
  6. ZDawg

    What are the most common reasons that Caesar ii diverges ?

    The most common cause of divergence I've seen is support gaps. Most of the time for me, the gap is too large to be effective. The pipe will either not touch the support at all, or will not expand enough to cause enough friction to make a difference.
  7. ZDawg

    Buried Pipe Between Soil Layers

    Hello all, I have run into this problem before, but recently I got a unique case. When burying a pipe that happens to lay between 2 layers of varying soil properties, what is the proper approach to selecting the soil properties to input in CAESAR? In the past I've used the properties of the...
  8. ZDawg

    Soil Parameters for CAESAR II?

    Hi, I've been trying to find out how to determine the undrained shear strength of soil without having the unconfined compressive strength. I have 6 geotech reports, of which none tell me the unconfined compressive strength for the depth I need to bury my piping model. I do have the plasticity...
  9. ZDawg

    Relief Line Thrust Force Dissipation?

    Good day, I'm trying to model the thrust force due to a relief valve. I was wondering if when I run the analysis in CAESAR, should I remove the pressure load in the operating case? Or should I determine the pressure gradient away from the relief valve first. I have a 42" PIG Launcher system...
  10. ZDawg

    Soil Stiffness and Anchor blocks

    I am beginning to understand now how to translate the soil stiffness to real world values, as well as how to read the forces at the anchor point using displacements. Now my question is, and I would really appreciate any experienced input, for a 42" pipe buried 5 feet to top of pipe, operating at...
  11. ZDawg

    Soil Stiffness and Anchor blocks

    Hello all, I am modeling several PIG Traps of varying size and all require an anchor/thrust block prior to the pipeline leaving the ground. I have already modeled them, buried them, set up the fine meshes, and even gone through and re-calculated, by hand, the axial restraints and required...

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