I can't believe the feedback here haha, this is way better than the old forum setup. This format is what every other forum format has been since probably 2000, the old eng-tips setup was definitely an outlier.
I encourage people to give it a shot before immediately poo-pooing the new format...
Thanks GBTorpenhow. I've asked the vendor (or the middleman at least...) to provide hardness, strength, and if possible which spec the 4140 actually is. I suspect you're right, it's probably round bar instead of plate. I'm thinking if the chemistry and the hardness match PCC-1 we should be fine...
I know it's available in A829, I have the 829 standard. The problem is that the vendor is providing 4140HT and saying it's NOT A829. There are other standards that 4140 is specified to.
I already saw this thread: https://www.eng-tips.com/viewthread.cfm?qid=408324
I'm looking for Type 4 washers that meet A829. PCC-1 has the following note:
"(2) Type 4 low-alloy steel washers shall be manufactured from SAE number 4130 or 4140 steel listed in ASTM A829."
However, much like the...
From another discussion on reddit: https://www.reddit.com/r/AskEngineers/comments/14gkmpt/titan_sub_stressed_beyond_yield_on_past_occasions/jp81ykl/?context=3
Bristol Composites Institute | Realising the Potential of Carbon Fibre Composites in Compression (2017)
"It appears to be due to the...
I wonder if that was a promotional video or if that really was the final assembly. I would think something like this would require a much more controlled environment than what is shown on there.
Roarks formulas for stress and strain. It's actually a really popular reference for all kinds of stress calculations. You'll see it referenced all the time in engineering calc packages. I was being a bit tongue in cheek, it's a legitimate source of information. An excellent reference but not a...
From James Cameron:
"“This OceanGate sub had sensors on the inside of a hull to give them a warning when it was starting to crack,” he told ABC News. “And I think if that’s your idea of safety, then you’re doing it wrong. They probably had warning that their hull was starting to delaminate...
Yes, press conference with the USCG concluded. They believe all 5 are lost unfortunately. Likely case was an implosion. They are wishy washy on when the implosion occurred, but I assume it had to have been before the plane were dropping sonar buoys otherwise it would have been fairly obvious...
Looking at PFI ES-7 (Minimum length and spacing for welded branch connections), spacing is not tabulated for branches below 2-1/2". What's the reason for this? Is weld spacing not as important for small bore connections? I can go to B31.3 304.3.3(e), but that appears to be a section for...
Okay. Thanks! Too bad my calcuation software is corrupted lol.
Followup: There was a very long discussion here: https://www.eng-tips.com/viewthread.cfm?qid=371342
We use "bleeder blinds", or 16.5 flanges with a tapped hole on the face, nipple, and valve, all over our plant to make sure lines...
Good morning y'all.
I have searched through this site and read some good information on tapping holes or nozzles in blind flanges.
Due to space requirements, we need to reduce from 16" to 10" within a 12" span. Originally, I was going to use a 16" blind flange, a 16x10 weldolet (flat), a...
Thanks everyone! I will specify Solvent and lint free rags to try cleaning the rods. Rod boots are also a great idea to help protect.
Some of the rods are not able to be stored in the retracted position, annoyingly.
Yes the OEM didn't specify a method, among many other things they didn't provide. The corrosion we have has already caused damage to some rod seals and wipers leading to significant loading arm downtime. I only found the Emery cloth and oil method with my google-fu, as I don't really have a...
Good afternoon,
We have a few large hydraulic cylinders controlling loading arms for loading ships at a terminal. These cylinders are subject to a harsh environment of salty air and as a result the rods are prone to small pits and some corrosion. I believe they are hard chrome plated. One of...
Thank you JJPellin. Our pump is a really old casting. As far as I can tell the feet don't even look square with each other. What are the risks if the pump foot isn't fully seated on the mounting pad? Would that be a reduction in stiffness?
See the title. Is there any guidance around the minimum distance of the mounting hole location from the edge of the mounting pad? I looked through our company standards and API 610 but didn't see anything for hold down bolt location requirements. I'm mostly just curious.
Or does this come down...
Hi y'all,
Yes, another question about throttling a gate valve. I know for typical applications throttling a gate valve is inadvisable. However, one of the managers at my site constantly requests that gate valves that are root valves to instrumentation (e.g. manual pressure gauges) are...
ASME PCC-1 "Guidelines for Pressure Boundary Joint Assembly" Appendix E has some guidance for flange alignment tolerances. The BPVC does not contain anything regarding flange alignment as far as I know. In which direction is your flange off by 3 degrees?
Centerline High/Low: 1/16" max...
