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Not knowing much about strain gauges - why would the response curve be necessary? Doesn't a particular resistance translate to a particular strain - in this case it would be negative.

I need to measure the negative strain after autofrettage (60,000 psi) of a thick walled vessel. In the past, I have used special sealing glands to connect the strain gauges to the outside where I could record my data. However, these were expensive and prone to problems. Would it be viable to...

Thanks gents - or ladies whatever the case is. I will be getting a coupling to do this with. roadapple

I was hoping for an outside fillet weld with the thread-o-let- but am guessing that the moment with the thicker plate is the reason they limit the thickness of the vessel. I have room to weld a coupling in the arrangement shown in UW-16.1 (i) - because my pipe is 8.625 od the curvature makes...

Question: I am doing a demonstration vessel with 8" sch 80 pipe (1/2" wall), a 8" pipe cap and flange at opposite ends. I intend on putting a thread-o-let on the side of the vessel. I have all my materials on hand and now I see in my design calc's that UW-16 (3)(a)(1) is limiting me to 3/8"...

Exactly. I see that UG-35.2 (and non-mandatory FF) addresses this type of closure, but there is not a lot of guidance as compared to the other design requirements.

prex - I found the section - Appendix 2 under the scope it addresses the "other" bolting methods and the use of rings instead of standard hubs/flanges. thanks again for your help. roadapple

prex, Thanks for the help. Now....where are those attachments located? This is like "where's waldo". roadapple

Background: I am designing an ASME Div.1, -20 to 100, MAWP 150 psi, water filter. It is constructed of 42" dia pipe (~26 long), with a welded head on the bottom, 10" inlets and 10" outlet come thru the bottom, the top head is constructed of a head welded into a ring and is made for easy...

Thanks for the information. I truly appreciate it. roadapple

Thank you first of all for your response. If I use a pipe cap - questions: 1. Where can the "standard" cap dimensions be found? 2. How can the 0.7 <=L/D<=1.0 ever be met? 3. Does a pipe cap fall under torispherical or semi-elliptical? If I am assume that the pipe cap is torispherical. The...

Concerning the rules in Sect. VIII, Div. 2: for torispherical heads. Step 2 page 4-50 0.7 <=L/D<=1.0 (eq. 4.3.5) or go to Part 5. I am designing a vessel out of 8 inch pipe with torispherical heads. The D=7.625 in and the L=8.625. Because the inside crown radius equals the outside diameter...

Thanks for the responses. I spent the better part of a day trying to find the answer calling all the div 2 shops I could find. In every case where I could get an answer the shop was using third party engineering services. So, I could not find an answer. The insurance carrier (handling the...

I can't find it in the rules and regs. So, I am going to call some U3 shops and ask them myself. I will report back. roadapple

JoeTank I would agree with you in principle as I thought the same thing. However, the state board told me just the opposite. Currently, I design stuff day in and day out under the exemption. The API standard doesn't require a PE to stamp off on anything (at least the one we are under)...

Thanks jte My insurance company told me the same thing. The requirement was not removed, but just modified so it could work outside the U.S. were the PE was not applicable title for what we would consider a licensed engineer. I think a few people are confused by the question - in Texas a PE...

Thanks for the answers. I am PE with the proper experience. What about div 3? Does it require a PE? roadapple

If you are having to deal with API welding then I sympathize with you. My welding experience in API 6A was such that I worked day and night to eliminate it (mostly) from all our designs. IMHO there are few if any materials listed in ASME that will get you the strength you will need - but we...

I am guessing this is the proper forum for this question, but I am unsure. In the state of Texas, the PE’s firm must be registered with the State as providing engineering services if the PE is practicing engineering. I am a partner in a manufacturing company. We are going through the process...

cnuk - me again, roadapple. API 5CT to ASTM - I have found the API Grades (typically the 4130/4140 customized) don't mesh with the strict ASME list. However, if you are looking for the allowable stress - 10.12.2 says that the test pressure is not to exceed 80% of the specified minimum yield...