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Hi all, I did some calculations using the normal distribution curve and Z tables. Normally these calculation use Z-values between -3 and 3. Are these calculations still reliable/applicable beyond a 99.9% confidence interval? Cheers, Alex

I did a calculation with moles and densities which does give a 31% increase in volume when it oxides but still a long way from the 27x that we observed.

Hello everyone, I was wondering how much certain metals or more specifically aluminum expand when they oxidize. On site we encountered a large pit on a submerged aluminum pipe. The pit was about 7.06 cm^3 in volume (if you were to approximated the volume as a hemisphere), after removing the...

@JStephen Sorry, meant to say reinforcement dunno why I just typed force haha. Thanks for the help everyone.

Hello everyone, I was wondering if someone could give me insight in how for example, a force plate disperses a point load at its centre that is perpendicular to its surface. Multiple factors come into play like stiffness, thickness, strain but so far I cannot find literature that goes into...

Hi all, When considering buckling as a failure mode due to wind, I was wondering if you could approximate windward wind(pressure) as an external pressure? I know wind should be seen a bending force but I am curious if setting them equal makes sense for the primary membrane stress or would just...

The anticipated leakage from the door is somewhere around 2.25*10^-7 Pa*m^3*s^-1. From the research I just did I assume that He is the better option.

Dear all, I am hoping someone can point me towards the right direction when it comes to selecting a tracer gas and probes to determine the leakage rate along the seal of a large opening. The opening is roughly 16 ft by 16 ft and due to the awkward shape it is next to impossible impossible to...

I am sure many of you are familiar with the Pressure Vessel Design Manual by Dennis Moss. In the design manual there is mention of a secondary bending stress along the hard axis on the nozzle. However, could somebody elaborate how a bending stress arises and in what direction this stress is...

Hello everyone, The company I work for has a containment vessel with an area of roughly 25.000 ft^2 (or 2300 m^2). Right now they do 4 spots per plate which seems a bit excessive to me. Would the formula; "margin of error = standard deviation divided by the root of the number of measurements"...

Thank you very much Steel PE, I looked into the 9th edition of AISC and it turns out it's formula H1-1 in 3-9 with different symbols

Hello everyone, I am calculating legs for storage vessel and I came across the following formula; Sc = (Sma/Sa) + (0.85*S)/((1-Sma/Spex)*Sb) I know the following... Sc = Unity check Sma = axial compression Sa = allowable axial compression S = bending stress Sb = allowable bending stress Can...

Hello everyone, I would like to verify whether or not any design rules apply to internal heating coils in ASME VIII division 1 or division 2. I read that they are exempt from minimum wall thickness and generally just require good engineering judgement (e.g. for thermal stress, flowrate...

Generally speaking Division 1 is more conservative than division 2. If you would have vessel that barely passes division 2 due to pressure it will probably be rejected by division 1.

Hello everyone, "4.5.2.1 Nozzles shall be circular, elliptical, or of any other shape which results from the intersection of a circular or elliptical cylinder with vessels of the shapes for which design equations are provided in paragraphs 4.3 and 4.4. The design rules in this paragraph shall...

Thank you TGS4, I overlooked 4.4.4.4

Hello everyone, I am using ASME VIII-2 and I would like your opinion about dealing with a distorted torispherical head (you can actually see a section of it bulging. I have looked at section 5 "design by analysis requirements". I am convinced it is save to do a hydro test and then divide by...

Hello fellow engineers, I am pretty new to the field of pressure vessels and have to use the 2004 version for an older boiler. I have difficulty interpreting the following bit from the 2004 ASME Div.1 UG-45(b)(1) for vessels under internal pressure only, the thickness (plus corrosion...