To answer your questions:
1.) This is typically what is called a butter pass. The alloy 625 is used as a buffer between two incompatible materials. Welding the Stellite directly to the F44 may cause cracking and non-boded material.
2.) for the correct procedure you would need to check with a...
If you are already using other FEM methods with regularity and success what is driving your desire to use different approach? Have you validated the accuracy of the method/software by reproducing the results of past analyses or example problems from the ASME PTB example problems manual? Can you...
Q1 does not mandate any defined organizational structure. Where R&D is placed in the org would depend on the duties it performs, but in most cases I would assume it falls underneath the umbrella of the engineering department.
If R&D is tasked with the development of of new products and...
While using WB the element selection is somewhat limited. In order to use a shell element you would need to be meshing a surface geometry and not a volume. If you have defined a given thickness ie. defined the in and outer boundaries of your surface WB will mesh it with solid elements which is...
The acceptability of the proposed alternative procedure is at your client's discretion. I doubt the use of digital pressure transducers will be considered an acceptable alternative to the dye. I believe that the purpose of the dye test is to drive the dye into any surface cracks that may open...
For valves 1 test cycle is considered from full open to fully closed or fully closed to fully open under differential pressure for shut off valves. For static equipment it is generally considered from no pressure to full rated pressure for a designated hold period, and back to atmospheric...
There are too many API standards to know which one you are talking about, but most of the valve codes do not prescribe a required wall calculation method. A corrosion allowance is normally applied to the calculations that I perform. For standards where a wall thickness calculation is given...
You may want to refer to API 6A Annex B for which PR and PSL levels are recommended for certain applications. As a rule of thumb a majority API valve products are sold as PR2. On to your questions.
1.) The manufacturer will label which of their products are PR1, PR2 or PR2F.
2.) My...
Are your conversions correct? As far as I can tell for the gamma and X-rays, yes. For the others I am not sure, as my experience is with industrial radiography using those forms of radiation. The Alpha and Beta rays are blocked by the equipment so I never had to work with the dosages.
Is it a...
You should read the marking section 8 of API 20E further details, but from what I am seeing no you do not need to apply an API monogram or date of manufacture to the bolts for any size, unless it is in the specification of the specification of the equipment manufacturer order the bolting. You do...
I understand the issues incorporating a seat ring in a high pressure valve, but there are some advantages as well. The primary of which is that the valve doesn't need to be removed from line, and sent to a machine shop for seat repair. As I said I'm not familiar with the particular code you are...
I'm not too familiar with this standard, but from what I interpret, no you can't weld 13% chrome directly to the body. Take this with a grain of salt as there may be some other sections in the code which disallow this practice, but it may be permissible to qualify a weld procedure using a butter...
You would need to manually define the contact by selecting the contact/target surfaces, and applying the contact behavior etc. You may need to refine the load time steeping to detect the contact. With that being said something may be incorrect with the model or design. The model may be...
I agree with the artist rendering theory. A couple of things to add to the list of wrongness is the bolt hole pattern is arranged so that one bolt is top dead center of the valve, and there are no relief fittings for bleeding off pressure trapped behind a closed seat. The bodies also appear to...
When I have worked with Lloyds in that past on PED registrations they had risk assessment templates and categorization tools available. The notified body you are working with for your registration may have slightly different templates so it is bet to check with them.
This is kind of out of my wheel house so I'm interested in what other have to say on this issue, but a couple of thoughts that have come to my mind are the following:
1) commercially available pipe with out of round tolerances that are acceptable for internal pressure may not meet your needs...
It is my understanding that the acceptance criteria for a 6D shell test is no visible leakage with the minimum pressure maintained for the duration of the test. As long as the pressure drop did not fall below the minimum pressure the test should be acceptable. There are no listed allowances...
Yes, it is stating that for the particular actuator, which is a spring close actuator, it requires some spring tension to be applied in order to reach the full down travel. The diaphragm will push the actuator stem slightly upward without spring tension. Refer to Figure 2 on page 3. I believe it...
No it is not the correct practice. The IOM for diaphragm actuators linked below specifically mentions how springs should be pre-tensioned in the Discussion of Bench Set section on page 7. This procedure is to be performed before mounting, and once it has been performed addition spring...
From what I understand you can't generate a crack on a beam element. For more information review that ANSYS user manual and fracture mechanics tutorials.
