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Thanks for your reply. This is not our responsibility to outline the path needed, but to help the customer and learn is the bigger picture. Thanks again. Dave Harhay Sypris Technologies Tube Turns Products

I have a part to a vessel designed to ASME 2015. Customer has designed vessel and other parts to ASME 2013. I must use 2015 per Sec VIII Div 1 Appendix 43, but to help the customer get over this difference in dates which they believe is insurmountable, I am looking for a technical basis and...

Thanks all for adding your input. I agree that in order to go forward, we would need a design change to allow this application and other challenging applications be trouble free as all the others through the decades. I have learned a lot from this failure. Dave Harhay Sypris Technologies Tube...

Thanks weldstan. My opinion is that you are jumping to the weld. My question was are the pits in the pipe 'normal' to see without the knowledge of the failure in our minds. The weld is there making that location on the cutoff very stiff. The pipe cutoff will always break near that weld just...

Thanks for the response metengr. You are a valued contributor. I have attached a photo of the failed mount. Note that a third party evaluation shows cracks propagating from the root of pits on the ID and there are multiple sites that are along the load path that parallels the weld which is on...

We have been using 2" lengths of 2" XS SA106 GrB pipe in pairs to hold a tapped bar. One difficult application cycled this loaded pair of pipes nearly 200000 times and failed. The pipes are welded on one tangent (top and bottom). The failure has been attributed to crack initiation and...

I am truly amazed that so many engineers don't see this. Thanks again for adding your input. Dave Harhay Sypris Technologies Tube Turns Products

Yesterday, three engineers had no idea of the bolted equations, provided none in lieu of them and told me that what I say cant happen. Today I get to talk to R&D mgr and hear what he says. Thanks desertfox for adding your familiarity with those equations. Dave Harhay Sypris Technologies Tube...

Thanks for your reply. The single comment that I get most is that the bolt sees no additional load over that of its preload until the part load exceeds the bolt preload. I show the equations that I mentioned above and say that this could be valid under certain circumstances but its not a...

I use the bolted connection equations from textbooks to determine either load on part or load on bolt. These equations have as inputs: bolt torque load, part load, stiffness of the part, stiffness of the bolt. My question is do many of you use this or are familiar with these equations. Often...

I would like the Sm for 4340 and cannot find any in Sec II. I see that theu UNS is G43400. Searching the Sec II nothing is listed. Can anyone point me to where it is or another source? Thanks. Dave Harhay Fives Bronx

Hi everyone, I will go to the local college library to look up fatigue curves for certain materials. But prior to going, I'm sure I need to ask for more data like UNS, or ASTM, etc. I want to look up fatigue curves for: P20 high hard, SP300, SP350, and SP400 (the last three are from Arcelor...

Thanks for the replies. I have been out at the site. I did find that Zook manufactures a 1/4 inch rupture disc that is both ASME UD stamped and has an Ontario CRN. Dave Harhay Fives Bronx

We have a high pressure, 30000 psi panel, made up of High Pressure Equipment and Autoclave products (nipples, valves, tees, ells, etc). The local Ontario TSSA inspector wants the rupture disk to be marked. The disk is about 3/8 in diameter and comes with a plate that details the capacity of...

Hi everyone, I ran across the mention of ceramic insert geometry in the form of a string of numbers separated by commas. But I am not able to find what those values correspond. My example that I see in a pdf on Machining Forces and Merchants Circle: "... a ceramic insert with geometry...

When I was a piping stress analyst in the nuclear industry, that was the common way to attach pipe supports. The concrete walls had many embedded plates that the piping support group welded square and rectangular tube steel. I never heard of any concrete issues. Dave Harhay Fives Bronx

Thanks for your questions. I am not sure why D2 was selected, this was done at another division. I did an FEA on the part with theoretical critical pressure on the ID and that pressure creates the 10000psi on the ID that was mentioned. Holes show a stress near 30000psi. The hardness was to...

We have had a failure of a component of D2 hardened to 62 to 65 Rc. The part flew into four pieces, fortuneately no one was hurt. The ID of the part was under a stress of 10000 psi. Holes are very close and as a stress riser contributed to the catastrophic failure. Some specifics:the...

Thanks for the replies. I have been away from the office, but want to say thanks for the answers. Dave Harhay Bronx, Taylor-Wilson North Canton, OH

We made solid threaded shaft(200mm dia)with groove in one end out of 4340 forged. That groove holds up a several ton load. The load bearing land of the groove has been etched with LM51 to help hold grease on its surface. Also, there are radii on the grooves to lessen the stress...