Questions tagged [water-pressure]

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Calculate the max speed at which a submarine rises/dives + acceleration

I'm trying to figure out how I would calculate the rate at which a submarine (or any object) ascends or descends in seawater given a certain buoyancy or change in buoyancy. For example, if my ...
Massimo Asteriti's user avatar
1 vote
2 answers
113 views

Trying to gain a deeper understanding of what a system curve (pressure vs flow) actually represents

I'm trying to make sense of what a system curve is, and I have three different conceptions in mind. Note: I don't have an engineering background, and these are relatively new concepts to me, so I may ...
spacediver's user avatar
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Equal Flow to differently spaced water recepticles

I'm Designing a self watering planter, and I want to split the water from a main resevoir at the top to 5 smaller tanks below, but they are at differing elevations and distances from the resevoir. ...
mmkranz7's user avatar
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Is there any difference in performance when using a small pipe diameter for a greens bubbler?

So a greens bubbler is a setup that helps the farmer cleaning greens/ gets/ fruits by agitating the water. Details here: https://blog.uvm.edu/cwcallah/2021/10/06/building-a-better-greens-bubbler/. In ...
Andy Andy's user avatar
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1 answer
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Could someone help me with this physics problem about water pressure

I am designing a rainwater collection system. Rainwater is initially collected in an open-top barrel equipped with filters and sensors. This barrel is connected to a pillow tank, a flexible water ...
Daan's user avatar
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How do I determine the moment of force that would have to be applied to the shaft to open the gate in this question on fluid statics?

I am presently studying fluid statics from Munson's textbook. I do not understand part (b) of example 2.6. The full question is as follows: GIVEN The 4-m-diameter circular gate of Fig. E2.6a is ...
Siddharth Yajaman's user avatar
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1 answer
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Can I use water flow meter for measuring flow of glycol accurately. Why yes/no?

I have water flow meter and I was wandering if i could reuse it in new project for glycol.
user42914's user avatar
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Inquiry Regarding High and Low Frequency Methods for Leakage Detection in Pressurized Flow

I am conducting research related to the detection of leaks in pressurized flow systems. During a discussion with a colleague, we delved into the question of whether employing high or low-frequency ...
Bovic Mirindi's user avatar
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3 answers
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Why are my water pumps becoming noisy all of a sudden

I purchased 3 identical submersible water pumps for my irrigation mister heads. Im running them in clear tap water at room temperature(blockages are not a concern) After running one for 30 hours, the ...
David jones's user avatar
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2 answers
66 views

What is the name for this style of "bellows" water pump?

I recently bought this old "bellows" style water pump and would like to find spare parts for it - there is no nameplate or model number, and I don't even know what to call this sort of pump ...
Jan Martin's user avatar
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How to make a constant flow rate of water from a tank with a faucet at the bottom side?

Consider I have water tank as shown by the picture. By normal condition, the flow rate when the tank is full is higher than when the tank almost finish, and till it finally finish it will stop (in ...
AirCraft Lover's user avatar
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Fluid Mechanics about Hydrostatic Pressure

The rectangular gate will open authomatically, when the depth of water becomes very large. What is the minimum value of d that will cause the gate to just open? The width of the gate is 2 m.
Ayça Arırt's user avatar
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1 answer
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"reversing pump" in closed water circuit, can water pumped reach further than wave length?

In a closed water circuit with a reversing pump. If the wavelength of how far water pressure wave (positive and negative) reaches during one pump/suction cycle is much shorter than the length of the ...
Johan's user avatar
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-1 votes
3 answers
59 views

Why are the water tank walls made of stretch film warping a lot whereas theoretically they shouldn't that much?

I am building a water tank of custom dimensions (1.5 m x 0.72 m x 0.86 m) out of stretch film. The stretch film is wrapped around a steel frame (see here for more info on this open source project). I ...
Cara Duf's user avatar
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What pressure do objects at exhaust of pipes feel from flowing fluid? Dynamic or Total?

Let's imagine that we have one fluid source separated somewhere in two pipes of R1 and R2, and we put one object at exhaust of R1 pipe and one more object at exhaust of R2 pipe (R1 > R2). Let's ...
Jawel7's user avatar
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1 answer
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Would this large scale "bubble pump" actually work?

I have read about bubble pumps which work by heating water causing a phase change, the water passes through a one way valve and condenses thus pumping water. Would this work at a larger scale as in my ...
Jan Martin's user avatar
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Calculate pipe size and friction loss for an agricultural project's water system?

I'm in the process of designing a water system for our regenerative agricultural project in the Horn of Africa. I'm looking to install a ≈1000L water tank on a 3 meter stand which will gravity supply ...
Jonathan Ciccarone's user avatar
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1 answer
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Can saline water be used in a hydro storage system and would the ambient temperature or higher liquid viscosity affect performance?

In regards to this question: How to determine the efficacy and potential energy of hydro power energy storage?. I'm searching for a cheap liquid that I can use for a small scale pumped hydro storage. ...
Bob Ortiz's user avatar
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How to determine the efficacy and potential energy of hydro power energy storage?

The project I'm thinking about building a cheap DIY hydro energy storage (like a battery) system. I can build it but so far I can't really figure out the calculations to validate my idea and where to ...
Bob Ortiz's user avatar
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1 vote
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Pipe size selection for seawater circulation system

I am trying to get the right pipe size for seawater circulation system aboard a ship. The water is used to keep oysters alive while transporting them. The system has 8 Ebara SQPB 100 pumps. The ...
SV Savannah's user avatar
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2 answers
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ELI5: How does this water (solenoid) valve work?

I took apart this hose faucet timer: When unpowered the valve is closed. When powered (either manually or by timer) it opens allowing water to flow through. I am attempting to learn how the open/...
n00b's user avatar
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1 answer
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User-settable pressure-relief valves for outdoor domestic water supply lines?

Is there such a thing as a pressure relief valve which can be attached to garden hose bibb threads that would relieve backpressure from a pressure washer, in order to protect old pipes and reduce the ...
Tim's user avatar
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2 votes
0 answers
34 views

Why does pressure regulator on garden hose jump from 60PSI to 135PSI when pressure washer sits idle for a couple of minutes after use?

There's a pressure regulator on our garden hose spigot. When the valve is opened with the hose nozzle closed, it reads 60psi. I attach the garden hose to a 2700psi electric pressure washer. After ...
Tim's user avatar
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Water flow measuring device for a simple ceramic water filter

I am looking for a solution that would allow me to measure water consumption from a simple ceramic water filter device (see picture below). The meter must be relatively cheap, work without being ...
Caserio's user avatar
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0 votes
2 answers
113 views

Most efficient electricity generation in a wide flow of water

I'm wondering what the best method is for generating electricity in a wide river. The assumptions here is that it's a strong flowing river. It is very wide and we're allowed to put an electricity ...
Trioxidane's user avatar
1 vote
4 answers
1k views

Ship Stability And Overturning Moment

Here a ship that is tilted due an external force . the buoyancy and weight force will create an overturning couple that will rotate the ship in the clockwise direction. Now, the moment equation was ...
Jesse Flynn's user avatar
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1 answer
977 views

Calculate steam flow rate with pressure difference

So I have a 4-inch pipe with a pressure of 1.5 bar drop to 1.01325 bar, with a temperature of 120 degrees Celsius. How can I calculate or estimate the steam flow rate for this system?
Johnny Song's user avatar
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1 answer
51 views

Controlling/regulating water flow in a vertical pipe

In the image above, the 2nd pipe is used to dispense water. Only so much of consumed water flows down in the pipe. Hence there must be some mechanism used to hold the water in the pipe and allow water ...
nagu's user avatar
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Water temperature control unit - what is the need for cold supply pressure?

A typical industrial water temperature control unit. Image source: Frigel. Our company uses water temperature control units (TCU) similar to the style shown above. Ours have an electric immersion ...
Transistor's user avatar
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