For a tank that has been in service, designed, and constructed to API 650 with no x-ray performed: Does the Code (any Code) allow the owner to perform a spot x-ray on the shell to effectively reduce the required minimum thickness? I have looked in API 579 but did not find anything that addresses...
Appendix F talks about acceptable nozzle loads when a vertical in-line pump is "supported only by the piping". What about when the pump is bolted to a skid, as when it is a part of packaged equipment. What criteria should be used to evaluate the pipe loads? is it reasonable to use the suction...
Determining the MAT of a piping system is pretty straight forward for pipe, flanges, etc. My questions are about the bolting components.
First question: Section 3.4.2.1.c Step 1.4 sets the initial MAT at -55 deg F for the nuts. if the nuts are heat treated somewhere in the manufacturing...
We have a number of pressure vessels built to ASME Sec VIII in the '60s that are now being assessed for brittle fracture due to possible autorefrigeration conditions. No consideration for low temperature (less than -20 deg F) were taken in the original design, and therefore assume that the...
We have an existing vessel originally designed in 1967 for a design temp of 150^F. There now exists the possibility of auto-refrigeration, so the vessel MAT needs to be determined per API-579 section 3.
After performing a Level 2 , Method A for all of the components over the pressure range of 0...
We have a tank that was built in 1966 to API 620 for 10 psig. We want to re-rate it. So, I start looking at the design details and discover that the top compression ring does not match any of those shown in Fig 5-6. It actually looks like one in API 650 F-2, detail "k".
My question is: can I...
Does anybody have experience with the Etank software and what are your opinions on it?
We are looking to re-rate a number of API tanks and are considering two options: design our own spreadsheet or a commercially available software package.
We have a number of tanks that were built to API 620 & 12F a number of years ago. The design paperwork has been lost and we need to assign a pressure/vacuum rating. So, how does one do that?
I am thinking that you would need to go through the inspection and testing portion of each of the...
We are modeling a relief valve 6" outlet pipe/elbow 6' long discharging to atmosphere. We have modeled the relief valve with a converging nozzle where the throat area has been adjusted to give the capacity required for the set of inlet conditions.
All of the outlet parameters (outlet pressure...
I bought a website program, developed it myself, and now am looking for a web host to upload and publish to a Host.
I see there are a lot out there (Inmotion, GoDaddy, FatCow, HostGator,...). All seem to offer pretty much the same. So, I am curious what do you use and are the advertised prices...
Why is a valve's actual (certified) area less than the effective area, which is used in flow formulas to determine the capacity of a relief valve?
For example, for an API "L" orifice (effective area = 2.853 sq in) the certified orifice areas (ref National Board NB 18) for Crosby and Farris are...
When evaluating a flange, using the Kellogg Peq method for piping loads, there is no mention on how to handle an axial force that is compressive.
Caesar takes the axial piping load as an absolute value, and uses it in the evaluation formula. This seems to add an additional layer of...
Following the Kellogg Pressure Equivalent Method, a Pe is determined, added to the max operating pressure for P and then compared to the flange rated pressure at the max operating temperature. This produces a simple, but conservative, result that will probably disprove a majority of flange...
API 520, 4.4.1.2: (Reaction force in an open discharge system) the value of "P" is the "static pressure within the outlet at the point of discharge".
How is that pressure determined?
Let me start this over, as I mis-typed the referenced API spec.
API 520,Part II, 4.4.1.1 Vapor Discharge: The discussion of the reaction force (F): "includes the effects of both momentum and static pressure".
Question: Does the momentum effect include the forces exerted at the elbow due to...
I know you are not supposed to double post, but after sitting on the PSV Relief valve forum for a week, with no responses, I will try here.
API 620, 4.4.1.1 Vapor Discharge: The discussion of the reaction force (F): "includes the effects of both momentum and static pressure".
Question: Does...
Not sure if this should go here, or the API forum, but will post here.
API 620, 4.4.1.1 Vapor Discharge: The discussion of the reaction force (F): "includes the effects of both momentum and static pressure".
Question: Does the momentum effect include the forces exerted at the elbow due to...
I've performed an FEA on a 1" thick plate, that is welded to the interior of the vessel. The plate has 2" dia holes on a 2-5/16" pitch. The edges of the holes are chamfered, to reduce stress risers.
I am now at the point of performing the stress linearizations. From Div 2, part 5, table 5.6 -...
Not sure if this is the correct forum for this question, or if the FEA forum would be better, but will give it a try.
Having performed an FEA on a perforated plate welded inside an ASME vessel, the FEA results are von Mises stress equivalent. The next step is to determine the material's...
I have a 24" dia tubesheet plate 1" thick with 2" dia holes on a 60^ pitch on 2-5/16" centers welded on the OD. The tubesheet has a surface pressure on one side and zero on the backside. Also, there are surface loads around the hold diameters. I first modeled the plate as a quarter plate using Z...
