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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2answers
52 views

Reverse Suspension Spring

So, in a car either a liquid or a gas gets compressed when force is applied to the suspension, and when the force is removed the gas/liquid tries to expand again which makes an effect like a spring, ...
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0answers
38 views

Calculating discharge from a reservoir as the head of water decreases

Due to the dry weather we've been experiencing in the UK I need to calculate the discharge rate from some reservoirs for work and how the dropping water level will result in a reduced head and so a ...
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1answer
34 views

Difference between pressure suits and anti-g suits

This question might come across as a newbie one but are pressure suits and anti-g suits are two names for the same thing? Google didn't turn up differences between them specifically (if there is any), ...
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0answers
24 views

What is a safe and efficient temperature range for absorption chiller generators?

I've read that the role generators play in the absorption chiller cycle is to concentrate the salt solution so that the evaporator/absorber can maintain a vacuum by constant absorption of vapour ...
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1answer
102 views

Why does the ball detach from the surface of cup?

Here, let’s say I have a tea cup. In that cup , let us say there is a ball inside the cup which is temporarily fixed to the surface of cup. Now , this ball is fixed very loose but strong enough that ...
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3answers
181 views

Given flow rate of an orifice at one pressure, how do I calculate flow rate for a different pressure?

Given an orifice rated 1.8 GPM of water at 90 PSI, how do I calculate the flow rate at 30 PSI and what rating I would need to purchase to achieve 1.8 GPM at 30 PSI? Below added to give some context, ...
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1answer
94 views

How does steam in almost vacuum condense at 35 Celsius?

I read about absorption chillers and found out that the water is evaporated/boiled off at the generator. Water boils over at about 3.7 Celsius in the near-vacuum conditions in the generator. Now the ...
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1answer
38 views

Absorption chillers: can they achieve temperatures below zero Celsius?

If I understand correctly (history shows I probably don't), then the only reason why the absorption chiller evaporators are restricted (I hope that's the right word) to extract just enough heat so the ...
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1answer
45 views

How does hydraulic pressure booster works?

This photo shows hydraulic booster used in HPHT Hydraulic Press. I could not understand its function. How does this pump boost the hydraulic pressure ? Thanks.
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2answers
59 views

What size feet for this wind-protection panel?

I need to create a series of free-standing perspex panels to add height to an existing fence for wind-proofing purposes. My idea is that each panel would be fixed to two supporting poles that are ...
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1answer
278 views

Fan performance curve

I am being asked to compare a fan which is going obsolete with its proposed replacement. From a mechanical and electrical point of view, they are almost completely identical so I have no concerns from ...
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0answers
43 views

Suggestion for headgear

I was surfing through the web to find any article about why boxers don't like headgears. Then some random website claimed that a headgear doesn't absorb the punches moreover they limit vision. So I ...
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1answer
70 views

How much water do steam turbines consume per kWh of electricity generated?

I know this depends on some factors, and I can only think of these: the inlet steam's temperature and pressure. If there are more factors then please do tell me. What is the maximum figure in liters ...
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2answers
2k views

How do suction cups work?

These are suction-mounting hooks. I want to visualize and understand how do they stick on walls. After these hooks stick on wall. Like we compressed them. How? Since gases are compressible up to a ...
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1answer
32 views

Water flow down a 9% grade for 750' then fills tanks before traveling up 20' over 175'

I'm in hopes that someone far smarter than myself can tell me the answer to my questions. I am setting up a water capture system for a spring. The spring drains into a pond where I am installing a 525 ...
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1answer
67 views

Energy required to liquify gaseous oxygen?

Does anyone know where I can find some documentation of a real-world liquification process, and the energy costs? I can calculate the heat that must be removed from O2 gas to get to liquid, but how ...
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1answer
68 views

Calculating Minimum Pipe Pressure Requirement for an Irrigation System

I am setting up an irrigation system for my ranch and I have a hard time calculating the minimum pipe pressure requirements to reduce cost. I need to know the maximum pressure the pipe has to cope ...
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24 views

Motor Torque Required in a Reciprocating Compressor

I am working on a Univerity project involving a reciprocating compressor and I am having trouble verifying the motor's torque requirements. I am relatively happy with my calculation method, however, ...
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0answers
47 views

Which of these propeller configurations is most efficient?

All propellers shown in the figure above are identical and are operated at identical speeds with four separate (numbered 1 through 4 vertically) configurations illustrated. The physical distance ...
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1answer
29 views

If an airfoil underwent horizontal loading, would it stiffen the airfoil? [closed]

I am designing a wing for a Vertical Takeoff and Landing aircraft. I am trying to choose a wingtip winglet for my aircraft. One of the option is a aft-swept wingtip winglet. However, this structure ...
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1answer
39 views

How could you produce large quantities of metallic hydrogen?

Could you somehow crush hydrogen atoms with magnetic fields in order to produce it? Or maybe someday someone will invent a material capable of withstanding 500GPa and we'll have giant machines that ...
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0answers
29 views

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? ...
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1answer
39 views

How would a w shaped tunnel system drain water?

My DnD group recently had a scene where we were escaping a tunnel system under a lake. My character used a bag of holding to slow drain the lake until we were at the bottom near the entrance of a ...
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2answers
27 views

how to find torque from force due to pressures that change as a function of z

My teacher is very strict about copying his work so I will have to explain it. We have a wall with two fluids of different constant densities and depths. The wall is 'L' long. The wall has a section ...
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1answer
40 views

Does pressure in a centrifugal compressor increase along the path of the flow?

Euler turbomachinery equation doesn't include a term for changes in flow area. But, an centrifugal impeller (not the volute) has increasing flow area along the path of the flow. Is the pressure ...
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3answers
106 views

I cannot properly understand the “pressure” referred to in Bernoulli's Principle despite my efforts

I get that with Bernoulli's Principle an increase in area = a decrease in velocity = an increase in pressure. I also understand the concept of pressure being force per unit area. My difficulty is with ...
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1answer
30 views

Strong resin for fibreglass

Is there a binding material that could be reinforced with woven glass fibres cloth for tensile strength, but which offers reasonable containment against high pressure when used minimally? Ie ...
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1answer
60 views

How to cut a pipe such that water comes out evenly across the length?

I am trying to build a wetland filter for a pond. Basically, you dig a big hole, fill it with rocks (large at bottom, small at the top), and pump water deep under these rocks, so the water slowly ...
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2answers
29 views

Using a Threaded Rod and Internally Threaded Tube as a Piston Pump

Im looking for a low cost, high pressure pump with good flow/pressure control for an espresso machine (a lot to ask, I know). My first thought was using a screw-driven piston. This will work, but Im ...
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1answer
116 views

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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0answers
17 views

What types of materials can be tested in a split Hopkinson pressure bar?

A split Hopkinson pressure bar can test different types of specimens, I would like to know what types of materials that are suitable to be tested with this method?
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4answers
111 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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0answers
15 views

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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1answer
55 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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0answers
37 views

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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2answers
44 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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0answers
28 views

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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0answers
67 views

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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3answers
90 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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0answers
21 views

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
60 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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1answer
52 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
162 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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2answers
177 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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0answers
80 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
41 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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1answer
76 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
162 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
34 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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