A customer specification has special requirements when using proposed allowable stresses based on guaranteed strength properties. I have not seen this before. We are quoting a ASME Section VIII, Div.1 vessel. What does this refer to?
Thank you.
In order to size the bolts for this type of flange, the contact force between the flanges is required. Since this is a non-standard rectangular flange, the calculation methods in Appendix Y are not applicable. Once the bolting is determined, I will run an FEA. Can anyone provide some insight...
Sorry if already posted but I do not see where the required bolt torque for Appendix 2 flanges using self energized gaskets (o-ring in this case) has been discussed.
Per PCC-1, the target gasket stress is 0 or very low. Therefore, the simple approach is not valid.
For the joint compound...
I am reviewing NACE MR0103-2015. 13.1.1 specifies the heat treatment conditions of carbon steel materials. Can someone verify my assumptions are correct or point me to a website or document that can verify these assumptions? Searching the forum and other websites, I assume the following...
Are these bolts impact test exempt per UHA-51(d)(1)(a) to -320 deg F? I assume the bolts are thermally treated above 1650 deg F per UHA-51(c)(1) even though the material specification does not give a solution anneal temperature. I have asked for our bolt supplier to provide more information...
We have a customer asking for PMI testing to verify 316/316L stainless steel materials in a pressure vessel with the ASME SA specification limits. They want to include the PMI tester accuracy in the results. For example, if the accuracy of the tester is +/-0.1 for Cr and the SA specification...
For the modification of PV values, is it possible for the equipment be located in a facility that is under control of the major hazard facility legislation per 2.2.5 (a)(iii) and also be located in an area where employees are not permanently stationed but may periodically visit for servicing per...
A seamless pipe shell welded to a seamless pipe cap on one end and an slip on flange on the other end. Spot RT is performed on the shell/pipe cap weld seam per UW-11(A)(5)(-b) in order to use a joint efficiency of 1.0 on the shell for the circumferential stress calculation. Since the shell can...
Are these flanges readily available or would it be better to use SA-350 LF2 material? Our flange distributors cannot locate flanges that meet the fine grain practice requirement per SA-20.
Thank you.
How do I determine the minimum width of a ring joint gasket to be used in a ASME Section VIII, Div.1 flange calculation? Typically, I would match the ring size to the pressure/temperature rating of a B16.5 flange. However, in this case, the pressure and temperature exceeds the 2500# flange...
Does anyone have any experience building vessels in the United States requiring EN 10204 3.2 material certifications? We have a customer asking for these MTR's. However this model is small and it seems unlikely any mill would provide these certificates for small quantities.
It looks like it...
Hello,
I know this has been discussed before. I am reviewing some swing bolt lug calculations for ASME Section VIII, Div.1. There seems to be many ways to check the stress in the lug. I assume the combined stress (shear and bending) should be checked using the maximum shear stress theory...
We have found that a horizontal Gould's eHM multistage pump will not totally drain through the diffusers into the pump casing. Our application requires full drainage due to possible freezing conditions. Has anyone had any experience or ideas on a solution? Would it be possible to drill a small...
Does anyone have any background on automatically priming a centrifugal pump? We are having difficulty locating an automatic air vent that is NSF 61 certified for potable water. The available NSF 61 air vents are very large and heavy and out system is subject to vibration.
We have tested a...
Can someone please give me some guidance in determining Cfig for a pressure vessel? Do you compute Cp1(θb) for various angles and sum the results to obtain Cfig? I assume this value is then added to Cfig drag force .63 to obtain the overall Cfig used in the design wind force equation.
Thank...
Does anyone know how to call out the weld symbol on a fabrication drawing for a weldolet when the run pipe size does not allow for a full fillet leg? (i.e.: 3/4" weldolet on a 1" NPS pipe)
Is there a standard location to orientate the vent hole on a reinforcing pad for ASME Section VIII, Div.1? ASME B31.3 says to put it on the horizontal centerline (not at the crotch). API-650 same thing. The Dennis Moss Handbook says at least 45 degrees from horizontal centerline. My shop...
Hello,
My company is looking at design a ball valve using Peek seats. Typically up to 2" size and 7000 psi at 400 deg F maximum. We are having trouble sealing the valve using seats contoured to the ball. Is there a special Peek compound that we should be looking at? Should we be lapping the...
I also posted this in the EU standards forum:
As mentioned in another thread, PED 97/23/EC heads that are hot formed need the head manufacturer's quality system to be ISO certified with an European pedigree or certified in accordance with PED 97/23/EC since the material properties are changed...
