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I'm working through the ASME B31G Calculations for the following http://www.novanumeric.com/samples.php?CalcName=B31G I'm noticing for the folias factor <= 20 ASME B31G, 2009, original method Sf=sflow((1-2/3(d/t))/(1-(2/3)*(d/t)/M) so when d=t, i.e. the flaw depth is 100% and there is no...

All, I've been trying to implement the ASME B31G calculations at http://www.novanumeric.com/samples.php?CalcName=B31G Any feedback? I'm trying to understand some of the background. Is Sflow more or less the yield stress and Sf the failure stress for the pipe? -Jeff

UbaidUllah65, Are the numbers matching? -Jeff

The linear doesn't seem to match the example problem. (2.36E-04 versus 3.0e-4). Looking at the graph I wonder if a quadratic scheme would work better. I wish they would give the derivation for these curves, that may give some insight into the best interpretation scheme. These codes so often...

UbaidUllah65, I'm working through the procedures myself at the moment. I curvefit every given curve and evaluated at a given L/2a and r/t. I am interpolating on a_r and debating which interpolation method to use. Is it better to use linear or to use quadratic interpolation? -Jeff

I'm looking at these curves now. It doesn't look like there is enough data. There is just two L/2a curves? I think the way to do this is the following do a linear curve fit for every curve. Calculate all the curves at the given R/t Then interpolate using L/2a and a/r to get an appropriate value.

Consider the poppet weight divided by the area of the orifice. Crane's Tech Paper 410 has some formulas for minimum flow (not sure how they are derived).

UbaidUllah65, Where are the source curve located? Is it a solution to an equation or are the curves available? -Jeff

API 653 (I pasted API 650 twice above) Min Plate for 60.0, 0.1 Calculating Thickness Per 1FT Method on Course1 Course1 D:60.0 G:1.5 S:24900.0 E:1.0 Cas:0.0 currentHeight:32.0 2.6xDx(H-1)xG/(SxE)+Cas=0.291325301205 Min Plate for 60.0, 0.1 Calculating Thickness Per 1FT Method on Course2 Course2...

I matched his numbers in my calculator for course 2. API 650 Calculating Thickness Per 1FT Method on Course1 Course1 D:60.0 G:1.5 S:23200.0 E:1.0 Cas:0.0 currentHeight:32.0 2.6xDx(H-1)xG/(SxE)+Cas=0.312672413793 Min Plate for 60.0, 0.25 Calculating Thickness Per 1FT Method on Course2 Course2...

I've never liked the ASME rules for external pressure. Are you allowed to do FEA under Section VIII-I to find buckling pressure?

PSlem, Send me the spreadsheet if you'd like, I can take a look at it.

Ron, Thanks for the reply. My masters is in Engineering Mechanics, which was through the civil engineering department while my undergraduate coursework and any job experience has been Mechanical. I always assumed strength calculations (like Wind, beam sizing, integrity calculation etc), to be...

I am a feelance structural engineer. I put a few samples of calculations on my website at http://www.novanumeric.com/samples.php and was looking for direction. What types of codes/calculations should I target? Ultimately, I'd like to sell it as a service to develop these calcs for certain...

I think the solver in Excel uses a variant of the Bisection Method http://en.wikipedia.org/wiki/Bisection_method

The data I grabbed from a paper describing the curve fitting procedure, but I don't think it's real data. I'm coming at this from a numerical method perspective, and not from performing experimentation. I was hoping to get some real world examples to try. Is one or two data points practical...

My advice. #1 What was the design code of the valve, and by connection the hydro test requirement for the valve in that code. Is it 1.5 x the Cold working pressure? What is this test pressure When you hydro test the pipeline, are you testing it to 1.5 x the cold working pressure? Depending...

Call Swagelok. I want to say for the Swagelok 50 series, the poppet material and body material are selected in such a way that cycle failure is not a primary concern of failure http://www.swagelok.com/downloads/WebCatalogs/EN/MS-01-98.pdf

Where is the liveload part of API RP1102 and the hoop stress part of B31.8?

Hi, I was hoping to get some feedback for the following applet I put on my website I am performing non-linear regression on Charpy data and calculating the parameters. http://www.novanumeric.com/samples.php?CalcName=Charpy Any advice/direction/feature requests/constructive criticism would be...