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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deformable object squeezing

I have the problem following. There is a deformable sphere with radius r. It goes inside a constriction channel with d*d cross section. Assuming that the sphere volume is constant and the sphere shape ...
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15 views

How to solve this question relating to string [closed]

There are two string of mass 100g and a inextensible string(0g).length of string is 1m. There is load of 100kg. Where should the load be placed so that the string breaks in the minimum amount time ...
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1answer
30 views

Running a hydraulic pump below minimum RPM

If I had a pressure compensated, hydraulic piston pump, how might the performance look in terms of pressure if I were only looking in the regime of 0 RPM and the minimum ratedRPM? I.E If a pump was ...
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31 views

How does Cooling Water Temperature affecting Condenser Pressure? [closed]

So according to the picture,higehr Cooling Water Temperature will cause higher pressure at condenser. Is there any mathematical function to desribe their relation?
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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 ...
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Would engineering bricks explode if used to build an oven?

I'm building a pizza oven and, to do so, I bought a whole load of engineering bricks (not these but similar). They've got five holes vertically through them, each hole is 2x6x6.5 cm (80 ml) and the ...
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95 views

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 ? ...
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Can't Find Regulator for 16G CO2 Cartridge (800 PSI to 400-200PSI)

I am trying to make a Paintball Gun that works off of 16G CO2 Cartridges(800 PSI). I can't find a compact regulator that drops 800 PSI down to 400-200 PSI. If anyone knows of such a regulator could ...
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2answers
180 views

How does placement of a pressure gauge in a tank of fluid affect the pressure readings?

This is not a real system but rather something I made up to understand how the placement of pressure gauge in a tank takes its readings. Here’s a diagram of it- The pressure gauge placed in the ...
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1answer
228 views

Pneumatic cylinder: Pressure rating

I want to create a Pneumatic cylinder, The purpose is, Inside it will will contain a Nylon piston, and one end will be filled with clay. Cylinder will be closed from either side using end caps, which ...
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267 views

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 ...
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574 views

Estimate PSI from pipe diameter and GPM

Many consumer grade pressure washers specify a minimum pressure for the supplied water, which is sometimes well above the low end of household water pressure. Our water pressure is often low and I'm ...
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1answer
59 views

Reduce and compute flow in self designed pen

I am currently designing a simple pen for drawing with different types of liquid varnishes. My current design has a tip at the bottom side of the pen (blue) and a tank at the top side where the ...
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2answers
68 views

Can you shape a buoyant object stuck to the bottom of a body of water such that it floats?

I understand that an object, say a closed plastic cube full of air, stuck to the bottom of an aquarium with a smooth glass bottom will not float if you firmly place it such that no water can get ...
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1answer
129 views

Equivalent Force: Hydraulic rams in H frame machine press

A 100ton H frame machine press can use 1x100 ton ram to exert this amount of force. Can 3x33 ton rams do the same job if they are applied to same area as the 100ton ram? Also in relation to a H ...
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Possible to suck water through manual bilge pump using a transfer pump?

I dug a shallow well (12' deep) on a remote off-grid Florida Property I own. The well is a simple 1-1/4 PVC Sand Point well I hammered in the ground. I then used a rubber coupler to attach a cheap ...
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1answer
48 views

Ceramic pressure measurement - piezoelectrical or capacitive?

Context: I'm writing about an old industrial training facility used for a petrochemical process. In this training facility, there is a 3-phase separator. On that separator is a pressure measurement. ...
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2answers
39 views

Sunlight-powered device set to change world: will it work? [closed]

Vast areas of desert sand are being shone on upon by the sun. Now that's some ENERGY! Using this proposed apparatus: Sunlight over large area is concentrated on steam chamber, where water turns into ...
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Is there a relationship between temperature and pressure of a refrigerant?

When searching for a pressure temperature relation for a refrigerant a chart appears. But I was wondering are these charts made by experimenting on the refrigerant or is there a relationship which can ...
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1answer
30 views

How to make a 500+ psi water gun staff

I would like to create a life size lego Bionicle Aqua axe(gali nuva Type or gali master of water Type). The problem is unlike The trident in this video: https://m.youtube.com/watch?v=NK6MWt7vpVE&t=...
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1answer
91 views

Head loss for T junction diverging water pipes

I am writing to ask for help with a T-junction pipe problem. Attached picture shows the pipe configuration. The schematic shows a large pipe with ID 16.5mm and smaller 4mm ID tubes connected to it. ...
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1answer
80 views

Liquid delivery to a pump based on viscosity

I have a tank that is filled with a viscous liquid (~3000 CPs). At the bottom of the tank there is a pipe that leads to a gear pump. There is 22" of pipe straight down from the tank followed by a ...
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Explain pressures created by fluid flow through small orifices

So my question is in relation to fluid flow and pressure. In my pictures below you can see that i have two similar situations. Fluid flows in from a large reservoir at a constant rate through a ...
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Part to pierce the valve on a 16g CO2 cartridge and connect to a Solenoid valve

The specific part that I’m after is something that can connect to a solenoid valve and a CO2 cartridge that will break the seal on the end of the CO2 cartridge. The solenoid valve connection is ...
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How to sanitarily measure vacuum in milk?

I would like to measure the vacuum inside of a tube which will contain air and milk. A vacuum pump attached to the tube will maintain a vacuum of around 15 inHg. Are there inexpensive sensors I can ...
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1answer
83 views

Pressure recovery in turbomachinery

Diffusers in turbomachinery are used to transfer some of the kinetic energy of the fluid to pressure energy and to direct the fluid to the ducting/second stage/... I understand this and the mechanism ...
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1answer
97 views

How to calculate flowrate of water through a crosssection of pipe?

Assume we have a pipe with a diameter of 10mm. Water is flowing through that pipe and we know that the water pressure at the 'open' end of the pipe is 2 atm. How would one go about calculating the ...
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1answer
98 views

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 ...
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2answers
170 views

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 ...
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33 views

Using Density Correction Factors for Fans and Blowers

I've been researching fans/blowers and their use in pneumatic systems (particularly conveying systems), and I'm confused by the application of density correction factors. Let me describe a sample ...
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1answer
15 views

Detect treadle press

I need to detect if a foot treadle has been pressed and send a signal to a Microcontroller unit notifying of that press. What is the best method to achieve this? What kind of sensor can be used and ...
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1answer
23 views

Hydraulic lift connected to two pistons

I just finished a problem, and got the correct answer, however I am confused on one of the mathematical operations that must be performed in order to get the correct answer. The problem is as reads: ...
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3answers
50 views

How can I keep my soda bottle at atmospheric pressure while dispensing the liquid via a sealed system pump?

I am making a "bar bot" and I am trying to figure out a way to dispense soda without it going flat. I am using a bunch of peristaltic pumps: Which luckily remain sealed at rest. I was ...
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2k views

Is a metal Prince Rupert's drop possible?

Can a Prince Rupert's drop be made of metal instead of glass?
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4answers
194 views

How to quickly equalize pressure in a low pressure container?

Background: This is for a science project I'm creating where I use an airpump connected to a sealed 5gal pail bucket to create a vacuum. That vacuum is then connected to water source to "suck" liquid ...
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1answer
41 views

How you calculate the temperature scaling factor?

Used to obtain the corresponding pressure at ambient temperature. Example when testing Proof or burst pressure to a given value at 300°F, but you will test with corresponding pressure (higher) to ...
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3answers
96 views

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 ...
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1answer
32 views

Work required to push an object inside a pressurized dome by using a piston

There is a large dome (pictured on the left side) with an internal pressure of 2 atmospheres. Assume that the internal pressure of the dome will stay constant at 2 atm. The purpose is to move an ...
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3answers
269 views

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 ...
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2k views

Do flexible water hose cause pressure drop with constant flow?

My dad has a tub by a lake. He has a water pump in the lake to pump up water into a tub. He claims that if he use a flexible hose, the pressure in the hose at the top will be lower than if he use a ...
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Compact way to regulate 3000psi (200bar) down to 30psi (2bar)?

This was originally posted on the Lego page, and closed because it's not actually about Lego itself. I thought I'd give them a chance first, in case someone had done this already and had some ...
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9k views

Vacuum Pump Power Calculation

This may be a silly question, but I'm not a mechanical engineering. What's the best way to calculate the energy required to reduce the pressure of a gas stream below atmospheric pressure? Obviously ...
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1answer
30 views

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 ...
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1answer
22 views

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 ?
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How far can we compress air manually?

I am not sure if such devices even exist, but I'm sure we can improvise. A device in which we could (manually) turn a shaft, screw a screw, or hammer an air-tight follower into a strong walled ...
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2answers
43 views

Will an empty spray can maintain a vacuum?

If I were to remove all the air from a canister of WD40 so that it was a vacuum inside, and reinforced the walls so that it won't collapse in from atmospheric pressure, what would happen when I pull ...
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1answer
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What is the optimal building material for a submarine pressure hull?

I have a difficult and interesting design project to work on and I am trying to get my hands on some ballpark figures from people who know engineering a little better. Help is appreciated! I am ...
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maintenance of steady flow through pressure or mass flow

let's say I have two points in a line, A and B. Between them there is a valve that can regulate the amount of the stream from A to B. Considering that there is a steady flow of the stream between A ...

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