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For SpaceNut ...
There were four topics containing the word "pressure"
I evaluated all four (and read two) before deciding this topic is different enough to deserve it's own topic
This topic is offered for gathering of information about the physics of pressure Vessels in general, as well as engineering and practical experience. The specific application I have in mind is propulsion, but the topic is not intended to be limited in application.
The impetus for this topic is an estimate by ChatGPT(4) that a pressure of 184 bars would be needed for an application.
I was curious to see what humans have achieved in construction of pressure Vessels, so the next post will provide a set of Snippets from Google to show the range of existing devices.
Over time, I am hoping our members will contribute other examples to the topic.
(th)
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This post is a collection of Snippets from Google, in answer to an inquiry about pressure Vessels, with a focus on the high end of the range.
The target pressure of interest is 184 bar. It turns out that 184 bar is quite a modest pressure compared to existing capability.
Apache Internal Server Error objected to the intended post so I have edited the post until it passed muster.
The original question was: pressure vessel to hold 184 bar
About 22,800,000 results (0.47 seconds)
SPECIFICATIONS · Type 3 Pressure Vessel · Maximum Operating Pressure: 6,000 psi (414bar) · Minimum Burst Pressure: 18,000 psi (1,2412700 psi / 184 Bar 1 - 7. 80A60. 519013. 600 psi / 41 Bar. 120°F / 49°C. 3600 psi ... Manufacturer Accreditation – The manufacturer must
Pressure vessels that are designed to withstand 400-bar pressure (400 atmospheres) are usually designed with heavy construction. If they are designed to go into ...by A Air · 2023 · Cited by 8 — Another design achieved a pressure of 558.5 bar before helium leakage was detected and a burst pressure of 620.5 bar, which is close to the ...
... pressure rating from 184 to 300 bars (2,670 to 4,350 psi). Cylinders are ... Usable air = usable pressure × cylinder capacity = 150 bar × 18 litres per bar = 2700 ...
Apache Internal Server Error accepted the edit shown above.... the values shown are inclusive of 184 bar, but most extend well above.
From this I conclude that humans are able to build structures that can hold 184 bar or greater pressures.
(th)
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In another search, I asked for the pressure inside an artillery barrel...
convert 310 MPa to bar
Pressure
310 Megapascal
=
3100 Bar
The reference for the figures above is: https://digital.library.unt.edu/ark:/67 … adc672863/
The work was done for the US Department of Energy. The study was on fractures in the gun barrel for a 155 mm artillery piece.
(th)
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One of the complications with pressure vessels, is that code compliance tends to specify ductile failure modes to ensure the vessel leaks rather than fragments. This is why pressure vessels tend to be made from low alloy carbon steels. These are not particularly strong, but ductility is as important as strength. For a pressure of 184 bar, the vessel will be thick walled, as yield stress of the vessel material will be somewhere between 250 - 500MPa. This makes pressure vessels quite heavy and thick walls are difficult to weld. This is one of the reasons why British gas cooled reactors used PCRVs made from concrete with steel stressing tendons. For large stationary pressure vessels, this is an under- utilised technology. It could be very useful for applications like compressed air energy storage.
"Plan and prepare for every possibility, and you will never act. It is nobler to have courage as we stumble into half the things we fear than to analyse every possible obstacle and begin nothing. Great things are achieved by embracing great dangers."
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For Calliban re #4
Thank you for contributing to this topic!
First.... can you provide a bit more detail about "difficult to weld"? Do you mean to weld two sections together, such as a pipe carrying oil from Alaska to the lower 48?
Second.... thermite is reported to be useful for welding steel rails in remote locations. By any chance, would thermite provide a strong weld if it were placed between two thick walled sections of steel to be joined?
Has this method of joining ever been done in practice, for a large object such as an oil pipeline?
(th)
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Gateway Capabilities
https://www.nasa.gov/gateway-capabilities/
Once fully assembled, Gateway will be about one-fifth the size of the ISS and weigh approximately 63 metric tons with an interior habitable volume (sustained capability) of about 125 cubic meters
Tiangong space station open to world
https://global.chinadaily.com.cn/a/2022 … a1c3e.html
Development Status Toyota's Manned Pressurized Rover and MHI's LUPEX Rover
https://global.toyota/en/newsroom/corpo … 37662.html
Water propulsion technologies picking up steam
https://spacenews.com/water-propulsion- … -up-steam/
Spacecraft passivation – An overview of requirements, principles, and practices as applied to spacecraft pressure vessels
https://www.sciencedirect.com/science/a … 6722001021
on Mars or Titan perhaps Land travel and movemnet and energy used in a system similar to light-duty railroad locomotives?
https://www.steamlocomotive.com/locobas … ailroad=mr
Last edited by Mars_B4_Moon (2024-04-01 16:06:00)
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