As I recall, plasticity analysis of annular bearing around a circular hole indicates that the bearing stress can be significantly higher than the yield stress before plastic flow occurs. Perhaps you can use this fact to allay the loss of preload concern.
We did the burst test, not the instrumented yield test, so I guess I'm stuck looking for the "maximum tensile strength of range of specification at room temperature".
I checked SA-276 which is what the vessel material was purchased to, but only the minimum tensile strength is specified.
NPTF threads are derived from the NPT thread form adjusted to achieve metal to metal contact at the root and crest of the threads when they are assembled. The are not any finer than NPT threads. Check Machinery's Handbook for a good writeup on these threads. I doubt you will find any torque...
Thanks for the reply, but I understand the thinking behind the UG-101 requirement to ratio the min tensile to max tensile in the formula. In lieu of actual tensile data for the component burst tested, you want the highest expected tensile value for the specficed material, just in case you...
I'm trying to determine the MAWP of a vessel based on burst testing using UG-101 P = B/4 X Smu X E /Smur. I have the burst test data, and I can find the minimum tensile strength of the vessel material, Smu(316L bar), but I do not have actual tensile data for the material that the burst test...
I have an opposite problem. How would you calculate limit loads for a vessel that you could give to a customer who hasn't designed his piping system yet? I'm designing a vessel right now where the customer has not specified nozzle loads, but he knows there will be such loads and wants us to...
Thanks for your insights prex.
I assume that using 1.5S for the allowable is based on beam limit design. This seems a better approach than fishing for a load distribution that solves the problem and then trying to justify why this distribution is ok.
I've links to sketches of the swing bolt...
I'm re-evaluating two pressure vessels with swing bolt closures (pairs of parallel lugs welded equally spaced around the circumference of the vessel flange and closure head flange, hinge pins through the vessel lugs capturing swing bolts which swing up between the corresponding closure head lugs...
Try http://www.sizes.com/materls/pipeThrd.htm.
Hand tight plus wrench make up is 7 1/2 turns which is 7.5/18 = .417. The table in the website says .408
Regards,
George Chapek
Cambridge Valley Machining, Inc.
28 Perry Lane, PO Box 160
Cambridge, NY 12816
Honda's CVT's have been on the market for about six years, using a metal belt that transmits power via compression as opposed to tension used in v-belts. The horsepower limit for this belt design is around 100 hp which is why it has only been seen in Civic sized vehicles. VW Audi's design uses...
Could the addition of reinforcement outside the area of the tank plate that would satisfy the requirements for reinforcement of an opening the size of the "tank plate", along with a determination of whether or not the the "tank plate" thickness can satisfy the the thickness...
