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Questions tagged [pressure]

Questions pertaining to pressurized systems and their applications, from containment to system losses to using as a benchmark for measurement.

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Understanding Pressure

Ok so what happend is that i started to think about Submarines and why exactly you cannot open the bottom heatch at lets say the Challenger Depth. At least i am pretty sure you cannot do that. Right ? Because, i was told that if you were to open the…
Erik Hall
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Why did the Plexiglass on the Bathyscaphe Trieste crack?

After passing 9,000 metres (30,000 ft), one of the outer Plexiglas window panes cracked, shaking the entire vessel. (Wikipedia) Why did the first layer of plexiglass Window panes crack on the Bathyscaphe Trieste while descending down to the…
Coto
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failure point of flat panel under pressure

Generally, how would I go about finding the maximum distributed pressure which a flat rectangular panel of material, say glass or acrylic, can withstand given thickness, length, and width? For example, a glass panel 10cm by 10cm by 1cm thick. How…
platatomi
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How to supply hydrogen to a fuel cell at a pressure lower than the atmospheric pressure?

I have purchased a fuel cell, and the supply pressure must not exceed 0.55 bar. My question is how can I supply the hydrogen at this pressure given that it is below atmospheric pressure.
Mohamed AbdelAlim
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Manually Attempting Empirical Measurement of Flour Dough Compressive Strength

I want to make a DIY dough press, so need to know how much pressure I would need to apply. I don't have mechanical engg background, so based on some googling, I think this is what I need to do, but wanted to validate here. I took a small dough ball,…
Asif Shiraz
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multiple wall, pressurized gas pressure vessel

I was thinking about interesting powder metallurgy method, hot isostatic pressing. Often thick steel walled vessel is required increasing costs and decreasing the prevalence of this technology. This led me to consider say several metal spherical…
user10585
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Why was the challenger deep so small?

According to James Cameron, the submarine barely had any space for him to move around etc., and as he approached the bottom of the Mariana Trench, the submarine shrieked down by a few inches (due to pressure). Why was the challenger deep designed to…
Coto
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How to convert ton force to pound force, manual pellet press

I'm looking into manual pellet presses and the one in mind lists a 12T clamping force and then goes on to detail that the analogue gauge goes from 0- 24,000 lbs. Are these two numbers related? When I try to convert T to lbs I usually get 26,880 lbs…
Andy Winhold
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Pressure sensors - gauge vs unidirectional differential

A gauge pressure sensor measures a pressure at a port against ambient pressure. A unidirectional differential pressure sensor measures a pressure at a "high" port against a "low" port. Is a gauge pressure sensor the same thing as a unidirectional…
Kane Anderson
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Hugoniot Equations and Impact Pressure

I have a wave propagation question that regards two materials impacting each other. The question asks to find the impact pressure of the impact with a tungsten carbide flyer and a steel target. I have calculated my two particle velocities from the…
user128115
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Piezoelectric Pressure Gauge

I would like to know how the pressure of a blast is measured when using a piezoelectric gauge as well as if this is the best way to measure the reflective wave from an explosion. In better terms I guess would be maybe how does the sensor, sense,…
user128115
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Pressure-Flowrate relation at Nozzle

If I need to get a pressure of 6 bar at the exit of a nozzle for cleaning purpose, how can I determine the following (assuming nozzle outlet dia to be 5 mm): The pump capacity to provide such a pressure. The diameter of pipe connecting pump to…
Harry
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How to get a wire from the inside to the outside of a pressure vessel?

Imagine you have a pressure vessel, e.g., the hull of a deep sea submersible. A good one would be a sphere of inches thick metal. But how could I wire the inside to a component on the outside? If I were to just drill a hole straight in and thread…
CPlus
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How to estimate pressure against a wall of a non-liquid like wood pellets?

For the creation of a wood pellet silo, I need to calculate the required resistance of the walls to support the lateral pressure: Let suppose a silo of $W * L * H$ full of wood pellets. Let suppose standards wood pellets of $600kg/m³$ (considering…
Adrian Maire
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How can I reduce the air pressure in a rubber hose by a certain percentage?

Washing machines stop filling with water when air pressure in a hose reaches a certain point. The bottom of the hose is attached to the bottom of the tub. On older machines the top of the hose is attached to a diaphragm that pushes against a switch.…
StymiedMike
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