As of May 31, 2023, we have updated our Code of Conduct.

# Questions tagged [hydraulics]

Questions about the flow and use of fluids.

216 questions
Filter by
Sorted by
Tagged with
1 vote
28 views

### Water distribution through N x Needle orifices

Consider a water distribution setup consisting of a feeder line blocked at one end but having 100 needle outlets all the same size. The feeder line cross sectional area is much greater than a needle ...
• 11
1 vote
34 views

### Bi-directional liquid transfer

I'm attempting to design a system that consists of 4 secondary(ABCW), 1 primary(Film) tank, and a pump. The idea being to Transfer the contents of each secondary tank to the primary one, then back to ...
• 111
1 vote
236 views

### Hydraulic Brakes - Why motorcycle brakes more powerful than bicycle brakes?

I was wondering why motorcycle brakes have so much more stopping power than bicycle hydraulic brakes (Than can be found on mountain bikes for example). The rotor has a bigger size which gives better ...
1 vote
119 views

### Distribution of water through a pipe network

I have a network of stainless steel pipes that are distributing water throughout a building. I know the flow rate of water entering the system is 600 IGPM, but am unsure of how this water will be ...
• 23
1 vote
2k views

### How to calculate the flow rate of a gas through a pipe?

I am trying to calculate the flow rate of Nitrogen through a cylindrical pipe. I only need a ballpark value, and the only information I have is the inlet pressure as 15 psig (assuming the same ...
• 23
96 views

### The Cavitation Problem

I'm new here and would like to ask where the cavitation would happen in my design. Thanks
761 views

### Determining steady flow between two reservoirs with two different pipes in between

Two reservoirs are connected by two pipes with different diameters in series. The elevation of Reservoir A is 40m and Reservoir B is 35m to respective water surfaces. The first pipe is 500 m long with ...
1 vote
50 views

### How do I Calculate Pressure at Multiple Points in Time while Filling a Container with Water?

Say I have a container completely full of water with a volume of 3000 gallons and I'm filling this container with water at a rate of 8.2 gallons per minute, it's already full at 200 PSI, how do I ...
• 11
1 vote
207 views

### Head loss from rectangular slot orifice flowing up?

For sizing purposes I'm trying to calculate head loss for a level spreader outlet for water, where the water is being supplied from below by pressure. It's essentially a reverse slot drain—instead of ...
• 111
1 vote
264 views

### Deriving the ideal equation for sluice gate problems - incompressible inviscid fluid

I'm trying to figure this problem out, i know the correct answer, and i know the method, but for some reason i'm missing something and i'm just not getting there, any help would be greatly appreciated....
• 111
3k views

### Does a motor suffer damage when resistance to the intended motion is met?

I'd like to create something similar to a hydraulic press. I know I need some sort of motor, but I was curious about a fundamental question about motors when used in a system where the force required ...
• 141
1 vote
525 views

### Hydraulic linear actuators as CNC axis instead of screws

Lately I've been watching some videos on machining and hydraulics as it always interested me. I was toying with the idea of building a budget CNC mill with threaded rod for the axes, but the issue of ...
• 13
126 views

### Constant force opposing hydraulic winch

I have a situation that I am hoping to solve with the use of electric motors, and a variety of controls. I have a hydraulic winch which turns at speeds from 0-60 RPM. This winch is coiling and ...
• 1
66 views

### Low-Flow Nozzles for Corrosion Spray Testing

So, for a cyclic corrosion test system, I need a nozzle or arrangement of nozzles that provides a flow rate of 45ml-140ml of salt solution per hour to an area 60cm square. All commercial nozzles I've ...
104 views

I am facing a difficult question and can't find answers anywhere else. What on the left is a hydraulic ram, it's pushing the box in the centre to move upward, while the four-bar linkage attached on ...
1 vote
3k views

### Mechanism of a manual Crank Adjustable Height Standing Desk

I am trying to figure out the lifting mechanism of a manual Crank Adjustable Height Standing Desk. Please see the image below: My question is what it is inside the metal frame (check the red marked ...
• 113
2k views

### What is the difference between hydraulic and ABS brakes?

Recently I read an article about ABS brakes. In that, they repeated several times the term that traditional hydraulic brake replaced with ABS brakes. Why it so? The reason for choosing ABS is ...
• 21
1 vote
84 views

### Help with simple hydraulic circuit to use for a four legged Robot

Firstly i am new to hydraulics, i want to build a hydraulic circuit that powers 4 cylinders at each leg of a Quad-Wheeled-Robot. The idea is to move the Chassis of the Robot up and down in all ...
1 vote
38 views

### Can hydraulics be used with a squarish piston?

I'm designing a custom part that needs an active shock absorber and space is restricted. I most likely won't be able to use a stock absorber and was thinking, can two squarish tubes be made tight ...
• 162
1 vote
86 views

### How are the modern hydraulic cylinders very precisely controlled?

My guess is that they use brushless Motors that in turn powers the hydraulic pump. But there must be some kind of valve that could help in the process. Still the burning question is just by adjusting ...
36 views

### water pump problems

I am presently facing a problem in water plant . In a tank there are four pump placed at equal distance named A B C D .in this arrangement A and D positioned at near corner of the tank . I started ...
1 vote
44 views

### Deciding between Electric or Hydraulic Actuators for a Dynamic Load of around 4 kN to 6 kN

This is a project regarding linear actuators for a 4 Wheeled Robot, with spider like hinged legs. The first question on my mind was to figure out is if a hydraulic system has any weight to Force(...
1 vote
58 views

### Static charge, PVC pipe and water

I know it's possible for a PVC pipe to develop a staic charge due to fluids flowing through them. This is a twist on that idea. Can a sealed length of pvc (say 3.5 feet in length) - tethered below ...
1 vote
31 views

### Low pressure Diesel pumping with High pressure Gasoline pump?

We are in desperate search of suitable pumps for one of our applications. We need to be able to pump Diesel fuel in a range going from 5bars to 125bars. To do such thing, I've been looking at Bosch ...
• 131
255 views

### Determining the headloss according to Darcy-Weisbach with pipes in parallel and series

Given the following situation: Pipe A and B have a known and identical length and diameter, and are in parallel. I'm assuming the flow trough pipes A and B are also identical, as is the roughness of ...
125 views

### The mechanism of submerged hydraulic jump

Is there a mathematical analysis of the submerged hydraulic jump, such as under what condition it is formed, the speed and trajectory of the circular flow therein, etc.? Is there a good mathematically ...
• 103
97 views

### how are these radial piston rotors machined

A typical radial piston rotor can have simple holes machined from the outside through the inner diameter to create flow channels for hydraulic fluid to actuate the pistons. I came across this model ...
32 views

### Pressure delivered to an object under a pneumatic press

I'm hoping some kind person can tell me if I have this right or not. I swear this isn't a homework problem. I'll be using a heated pneumatic press to heat seal lidding to plastic containers (...
1 vote
248 views

### What are the difference between open loop and closed hydraulic system?

I'm trying to get informative resource material through this.
• 31
77 views

### Hydraulic motor sizing

16 Examples of Tensile Strength has a list of items and their tensile strength. bamboo has these tensile strength ratings Bamboo MPA 350 PSI 50,763 If I needed to have a hydraulic motor to shred ...
• 21
3k views

### What is "water surface elevation" and "headwater"?

I want to understand the meaning of headwater, and I stumble across this page, and this diagram: This is where it got me. Headwater is defined as measured from the flow line (invert) of the ...
• 1,264
1 vote
102 views

### Calculate Efficiency Loss of a Leak in a Hydraulic Cylinder

I am trying to figure out what the efficiency loss of a leaking hydraulic cylinder is. This master's thesis found that a controllable pitch propeller (essentially a hydraulic cylinder inside a ...
1 vote
614 views

### Open Channel flow with pressure losses - flow depth?

In a horizontal channel that feeds off a river, does the head/pressure loss due to friction, turns etc in the channel translate to a drop in the water level between its inlet and outler? If so, could ...
• 11
845 views

### Head loss curves for PEX tubing?

Is there a reliable online reference for head losses of PEX tubing at various nominal sizes and flow rates?
• 205
250 views

### Why does pressure during a hydraulic transient phenomenon like fluid hammer goes below the line pressure?

I am trying to understand why the pressure fluctuations during a hydraulic hammer phenomenon would go below the line pressure (Pmin < Pi) I thought there will just be a rise in pressure and then ...
• 327
1 vote
455 views

### Low flow hydraulic motor to run high flow pump?

I would like to get some opinions on using a low flow hydraulic MOTOR to drive a high flow pump ? Would the high flow pump be able to create a useable pressure to drive a piece of equipment that ...
1 vote
50 views

### Modeling Water Flow Through Saturated Medium

I am working on a project that uses a variable-speed pump to achieve a desired pressure across a medium (coffee grounds). The system includes a pressure sensor in-line between the pump and the medium. ...
• 85
664 views

### Calculate hydraulic torque from motor HP, hydraulic pump and gearbox

I am curious about the design considerations for a hydraulic system. Let's say you have a 3HP 1200RPM motor you also have a hydraulic pump that's rated 4LPM and pressure of 40MPA rated for 40RPM MAX ...
• 229
1 vote
55 views

### Where to put the booster pump at customer substation in a district heating system?

In a district heating system, one of the houses in the distribution net is not getting the desired heat into their house. This is because the pipes of this customer which connects them to the ...
• 21
95 views

### How to make sure a pipe does not take all of the water from a stream?

I am trying to design a pipe which takes water from a river and transports it to a reservoir. However, I do not want my pipe to take all of the water from stream, because that will create all sorts ...
107 views

### What would a track in a culvert be used for?

A colleague works in a closed (no public access) watershed and came across this culvert today. These smooth "tracks" down the center of the culvert are something we have never seen before. Any idea ...
1 vote
37 views

### Fluid for mechanical lubrication and hydraulic connection to plastic/rubber parts

I have a piston made of anodized aluminium and stainless steel with nitrile seals which I need to connect hydraulically to our system which mainly consists of silicone rubber with polycarb and acrylic ...
3k views

### pressure loss in a T fitting

For weeks I have been searching internet , but still unable to find answer , so here it goes: I have to calculate pressure losses in heating circuit , and am stuck at calculating losses in T fittings. ...
1 vote
242 views

• 4,687
4k views

### How do you interpret a pneumatic regulator symbol?

I'm an EE trying to interpret a pneumatic schematic and have a few questions regarding the symbols being used. I've come across two different regulator symbols (or so I believe them to be regulator ...
• 189
50 views

### Practical rugged method for elevating water 7 feet high? [closed]

At a very low-tech, rustic forest camp, I've built a 'water tower' connected to a gravity-fed water filter to provide something like a clean water faucet. It's basically a 5 gallon bucket on top of a ~...
• 109
55 views

### Difference between direction of ramming in hydraulic press?

In Printed circuit board/Plywood lamination Hydraulic Press machines (seen here). The ramming action comes from bottom in all the machines I saw so far. For such action from bottom, excavation has to ...
• 31