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Questions tagged [pressure-vessel]

Containers that are designed specifically to retain internal pressure or a vacuum

A pressure vessel is a container designed to resist a uniform pressure load exerted by a fluid medium. This fluid can be atmospheric air for a vacuum chamber, or high-pressure steam in a heat exchanger.

Pressure vessels are typically designed to a safety code, such as the American Society of Mechanical Engineers Boiler and Pressure Vessel Code.

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Why do we neglect the radial stress in case of a thin pressure vessel?

A cylindrical or a spherical pressure vessel, having inner diameter $d$ & thickness of wall $t$, is called thin if $\large \frac{t}{d}<\frac{1}{20}$. $\bullet$ Thin cylindrical pressure vessel hoop or circumferential stress $…
Harish Chandra Rajpoot
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How to calculate the pressure loading of a vented silo explosion?

I would like to independently check a vendor's silo design for proper explosion venting. Worst case, it is essentially cylinder filled with a stoichiometric mixture atomized sugar dust and atmospheric oxygen initially at atmospheric pressure. The…
ericnutsch
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Making a radial (only) seal inside a small tube

I'm trying to make a adaptor to fit a nozzle about 5mm wide which only applies pressure radially during insertion. Pushing in a standard O Ring would apply some force axially up or down the inlet due to friction. The adaptor should seal in the…
Oliver Walters
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How does a pressure vessel fail when the interal pressure exceeds the yield stress of the material?

When we design a pipe or pressure vessel, we look at hoop stress and longitudinal stress and then look at the material properties. We assume that the material reacts to the load as a solid. However This answer and comments claim: Wall thickness…
mart
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Calculating maximum internal pressure from maximum rated external pressure?

Is there a calculation / rule of thumb that can determine a containers rough maximum negative pressure (vacuum) from it's rated internal pressure (assuming a single layer construction so there is no additional bracing preventing expansion). As an…
norlesh
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Easily compute a good approximation of heat conductivity of cooled semi-vacuum (water vapor + air)

I am preparing a classroom demonstration about heat, including a demo of how a satellite loses heat only radiatively, since it's flying through a vacuum. I'd like to make the vacuum-production apparatus very simple and cheap. The kind of pump used…
Michael Turner
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Why is the thin-walled cylinder more likely to experience failure along its axis than along its hoop/circumference?

I was watching a YouTube video to understand the concepts of hoop/circumferential stress and axial/longitudinal stress in thin-walled cylinders and their formula derivation. So the formula of the Hoop Stress: $$\sigma_{hoop}=\frac{(p * r…
user27920
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How to remove protective valve cap from CO2 cylinder?

I have received a CO2 cylinder from an online seller fitted with a protective cap over the valve: I understand these should unscrew, but this one appears to be stuck very firmly. Is there a standard or recommended way to remove these safely? The…
Riot
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Minimum thicknesses of an elliptical cylinder pressure vessel

For pressure vessels in the shape of circular cylinders, we can use $\sigma_{hoop}=\frac{pr}{t}$ to find the minimum skin thickness by setting the hoop stress the maximum allowed value, and then solving for t. But, what about (the more complicated)…
CircleSquared
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What are the claimed advantages of using Carbon fiber for a pressure hull?

Much of the news around the Titan incident has focused on all the reasons that carbon fiber was a bad choice for the hull, but I've yet to see any discussion as to why it was chosen at all. Was it chosen because the designers perceived there to be…
BCS
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Is this pressure vessel feasible?

I am intending to construct a small pressure vessel. It needs to be around 7 centimeters in length and width and around 1-2 centimeters in depth. It must be capable of being pressurised to 300 psi with sufficient space to contain a small amount of…
Richard
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A query regarding constructing vacuum sealed vessels

The atmospheric pressure at the surface of the earth is about 101 $kPa$. For Carbon fiber reinforced plastic (70/30 fibre/matrix, unidirectional, along grain): Young's Modulus is: $181\ GPa$ Density - $1.6\ g/m^3$ With these parameters in…
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What's the best type of steam Trap for Superheated Steam?

Process Engineering Newbie here. What kind of Steam Traps are best suited for condensate removal in super-heated steam line or manifold? The super-heated steam is to be supplied to a process reactor and will be at a temperature of around 390 to 420…
ZenMaster
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How to apply the permeability value found from an experiment?

I have done a permeability experiment on LDPE in the presence of air using a 25mm circular specimen. At 30'C, the permeability was found to be 1.846 barrer. Now I am trying to apply this permeability value to a calculation whereby I am trying to…
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Determine force distribution from a bolt pattern

Need some help designing a bolt pattern for a pressure tight enclosure. How do i determine the force applied at a distance from a bolt location so that I meet the minimum force to compress the gasket along the entire length of the enclosure but…
Kiran
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