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Questions tagged [pressure-vessel]

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

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Is It Possible To Calculate The Internal Pressure Which A Sealed Glass Vessel Can Support, By Creating A Relative Vacuum Outside The Vessel?

Questions are bold with context surrounding them. I am not an engineer. Well, I'm a computer scientist but I don't do this. I do, however, brew kombucha and am looking to scale up. I have a new ...
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Rectangular pressure vessel

I'm trying to find a theory reference for stress and deformation analysis of a closed rectangular pressure vessels with constant thickness subjected to pressure loads. By now, my test case would be ...
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Pros and Cons of Carbon Fibre High Pressure Tank

What are the advantages and disadvantages of using carbon fibre for pressure vessel construction? Carbon fibre has a very high tensile strength and is very light-weight. According to this calculator ...
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How do I calculate the stress distribution (von Mises stress) on the top cap of a vacuum vessel cylinder subjected to 77 kPa, h=600 mm and dia=200mm

I have designed a vacuum vessel 600 mm deep and 200 mm in diameter with a thickness of 2mm from SS 316 and simulated pressure distribution using FEA. I want to theoretically validate the findings and ...
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Cuboid pressured container - will the pressure reach the shear pressure of the material?

I'm having a go at designing a water electrolyser for producing hydrogen. I would like to store the hydrogen with minimal compression effort. Up until the past week I have been thinking about using a ...
Boolean's user avatar
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What are the claimed advantages of using Carbon fiber for a pressure hull? [closed]

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 ...
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Thin wall pressure vessels: local stresses in bends

How can I calculate the stresses in corners where different geometries meet? This image is a quick example of the positions i am referring to. Additional information In class we studied the membrane ...
RocketScience's user avatar
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In a thin-walled cylinder, what exactly is Hoop Stress vs Radial Stress?

If I have a thin-walled and not very stiff cylinder, such as a rubber-band, and I put it between two pins and pull it apart radially, is the force required considered the hoop force or radial force? ...
Colton Campbell's user avatar
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Why is there a MIN and MAX marking on a car coolant bottle?

This question was initially posted in physics stack exchange, then the mechanics stack exchange but I think it's more appropriate for engineering section instead. I've always thought the minimum and ...
Aden's user avatar
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If a piston has a larger upper surface area than lower surface area experience a force downwards even if that piston is ventilated?

Here I have a system where there is 18 bar of Nitrogen in a valve with a piston. The pressurized nitrogen is below the piston, above the piston, and also in the ventilation bore in the piston. ...
Konstruktion Powertech's user avatar
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What is the best way to go about finding properties of stress like working stress and yield strength when the material is unknown?

Our group has been working to design a combustion chamber of a relatively small hybrid engine with a chamber pressure of 30 bars. We are currently faced with the problem that we cannot easily access ...
Baldwin Chen's user avatar
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How to 'normalise' the effect of temperature on pressure to determine an accurate leak rate

I want to determine the leak rate of a container. I pumped it with air and measured the temperature and pressure within the container. What I observed is that, due to fluctuations of temperature in ...
Pipistrelle's user avatar
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Are you able to compute the bending moment exerted on the inner edges of parallelepiped box under inner pressure?

Suppose you have a parallelepiped box of dimensions $a\times b\times L$ with $L\gg (a+b)$, filled with simple distilled water exerting a uniform and constant inner pressure $p$ as reported in figure. ...
Fabio Fuiano's user avatar
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How to calculate the logarithmic mean temperature difference of a jacketed vessel?

I'm a bit confused on how to calculate the $ \Delta T_{LM}$ of a jacketed isothermal CSTR. Because the formula for the logarithmic mean temperature difference is: $$ \Delta T_{LM} = \frac{\Delta T_{...
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Relief valve for "semi-closed" loop system (non-engineer warning :-)

My excuses in advance for the probably-bad wording of the question, I'm just an hobbyist without much knowledge in engineering. To the point I can't google for information on my problem since I don't ...
Joe's user avatar
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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 -...
TheoryQuest1's user avatar
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Is there any way to quantify the rate at which pressure is relieved in a reactor?

If a pressure relief valve is open, is it somehow possible to quantify the rate at which the pressure in the reactor will decrease?
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Why can't I find a small vacuum fryer?

I'm looking for a vacuum fryer and so far the only ones available to buy are large, industrial machines. Is there some technical consideration that makes small scale machines economically unfeasible? ...
O James's user avatar
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4 votes
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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 ...
Oliver Walters's user avatar
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2 answers
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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 ...
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How do I limit the pressure of a tank to a fixed PSI?

I previously asked about the safety of connecting my 150 PSI air compressor to my auxiliary 120 PSI tank. I was warned of possible compromise of the tank which can lead to injuries and even death. It ...
user148298's user avatar
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4 answers
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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 ...
mart's user avatar
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Is it safe to use a 125PSI rated auxiliary air tank with a 150PSI air compressor?

I have a small, 5 gallon, pancake compressor which has a maximum 150PSI rating. Unfortunately, it doesn't have the air capacity to power the demands of an HVLP paint sprayer or a die grinder without ...
user148298's user avatar
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Can I increase the range of a howitzer by using more propellant?

The muzzle velocity of a firearm can, all else equal, be increased by lengthening the barrel of the weapon which can theoretically be extended up to the point that friction and air resistance would ...
Hypnos Stratagem's user avatar
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Analytical solution of thermal stress in a bi-metallic cylinder

As a side project I have looked to solve using Python an analytical solution for one-dimensional transient heat transfer in a thick cylinder with cladding on the inside surface, wherein the fluid in ...
DMC05's user avatar
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Should pressure vessel head be thicker than wall [closed]

I wondering should the head of a rectangular pressure vessel cylinder be thicker than the wall ?
richardo tong's user avatar
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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 ...
ZenMaster's user avatar
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Regulating pressure down inside vessel as it increases

I want to keep the pressure inside a balloon (effectively - a rubber vessel) constant, as the balloon is compressed. I'm wondering if a regulator like this (wiki page here showing mechanism - I ...
Oliver Walters's user avatar
3 votes
3 answers
4k views

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 ...
Riot's user avatar
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How to determine minimal wall thickness for a rectangular pressure vessel?

I know this is a basic question but google only gives formulas for more "rounded" shapes. How to calculate the minimal thickness for a flat wall knowing tensile strength of the material and the ...
Francis L.'s user avatar
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Trying to understand water pressure / air pressure

i have been researching deep dives. I understand that deep-divers have the same pressure inside of their bodies as there is outside. Yet i still cannot understand how they do it. Even if they have the ...
CuriousGeorge's user avatar
1 vote
2 answers
63 views

Choosing Pressure Vessel head

Can I use a conical head at the bottom for a small diameter steam manifold ( Schedule 40- 3 inch dia. and 2 inch dia. ) that needs to operate at high temperature (~450 deg Celcius) and High design ...
ZenMaster's user avatar
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Kinetic energy of a balloon

How do I quantify how much kinetic energy would be released from popping a balloon? I believe that any additional kinetic energy that results from the balloon will come from it being pressurized, but ...
Hypnos Stratagem's user avatar
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1 answer
71 views

Wall temperature of pressure cylinder - Boundary condition

I have a thick-walled pressure cylinder, that transports fluid and experiences only internal pressure. During the process, the outer wall temperature is measured. And I have no clue about the inner ...
Neuling's user avatar
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Ideal gas law, theory vs reality

I am trying to get an idea of the amount of hydrogen that I can store in some pressurized steel tanks underground. Based on the ideal gas law PV=nRT I did a simple calculation pressure = 200bar ...
sean's user avatar
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Plane Strain examples

Trying to find examples of structures, components etc. in plane strain (under normal loading conditions). Is a thin-walled-pressure-vessel in plane strain? (I thought it was plane stress but could ...
William White's user avatar
1 vote
1 answer
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Are tube fittings a feasible way to create tight seal?

I'm doing an experiment where 2 electrodes are inserted into 2 openings in a cylinder holding electrolytes to measure its impedance. We want the openings to be tightly sealed because the cylinder ...
Hong Wei Chen's user avatar
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hydrostatic storage of gasses

This question is a bit general but hopefully someone can point me in the right direction. If you have a metal container, welded shut that's fitted into a hole that is say 10 meters wide and 30 meters ...
sean's user avatar
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1 vote
2 answers
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Flange EN1092-1 Type 21 Bore Diameter

How is the bore diameter of a flange Type 21 - acc. EN 1092-1 determinated? In the standard: NOTE 5 The bore diameters of flanges type 21 are not specified in this standard, the effective bore ...
Mech_Engineer's user avatar
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1 answer
3k views

When calculating the deformed radius of a pressurized thick-walled cylinder, why is the hoop strain used rather than the radial strain?

The context I’ve taken an interest in the design of pressure vessels for use in submarine applications. From a cursory survey of what is used in industry, it seems the de facto standard housing is a ...
uniquely average's user avatar
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Thin or thick wall for expanding rubber pressure cylinder

If I want to expand a rubber cylinder by a certain internal volume - with all else held constant (type of material, length and radius (without constraining it), etc.) will a thinner or thicker walled ...
Oliver Walters's user avatar
1 vote
1 answer
95 views

What is this part called, and where could I get one?

I'm fairly illiterate when it comes to Engineering, so please understand I have pretty much 0 idea what I'm talking about. I'm having to build a seawater distillation device for school, and we ...
Zack's user avatar
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0 votes
1 answer
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Check valve with precise cracking pressure

I have two containers of air, one at 100 kPa and rising, the other at 30 kPa and decreasing. I need a valve that lets air through when the pressure difference is >70 kPa. Where would I find a valve ...
Peter Poláček's user avatar
4 votes
1 answer
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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 ...
Michael Turner's user avatar
1 vote
2 answers
1k views

How much pressure would I need to push water out of tank?

How much pressure would I need or, better yet, how do I compute for the pressure required to push water out of a submerged tank? Do I use 1 meter as head or 7 meters? (Please just bear with the ...
binopaker's user avatar
3 votes
3 answers
4k views

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 ...
CircleSquared's user avatar
1 vote
1 answer
148 views

Designing a horizontal pressure vessel

The question reads Design a horizontal pressure vessel with hemispherical head supported by saddle support and fitted with 2 nozzles welded to the head. It's used for storing and delivering fuel ...
user127's user avatar
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2 votes
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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 ...
I.vdM's user avatar
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1 answer
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using air pressure as a liquid pump

I have a $100\ \text{psi}, 300\ \text{cfm}$ air compressor that we use for running power tools, I need a way to inject mortar deep into a small opening and was wondering if anyone had experience with ...
Dane P's user avatar
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1 vote
1 answer
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What is the criteria for bubble entrapment in a closed headspace tank set to drain?

Suppose a closed tank does not have any pressure relief system and is set to drain from the bottom. It is said that because the headspace pressure drops as the liquid level goes down, the tank will ...
Vinícius Godim's user avatar