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...
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...
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...
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...
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...
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.
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...
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...
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...
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...
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...
