Questions tagged [hydraulics]

Questions about the flow and use of fluids.

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1answer
39 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
21 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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2answers
34 views

Stop Spa-to-Pool Siphoning Thru Spa Pump

I have a partially above ground Spa and an in-ground pool. When the spa is filled to spillover with pumps off, water siphons through the spa pump and into the pool until the spa water level drops ...
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1answer
18 views

Does a single-wheel brake intervention from ESC cause one wheel to be not brakeable by the driver?

Source: https://www.kfz-tech.de/Engl/Buchprojekte/HBremse/ESP3.htm Firstly, I don't know if this is the right StackExchange, but I will try nevertheless. Above I posted a picture of the hydraulic ...
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1answer
61 views

What specific technical concerns exist for China's Three Gorges damn on the Yangtze river?

Recently, many people (specifically geopolitical and financial analysts) have pointed out that there is a serious concern about China's Three Gorges Dam breaking and causing catastrophic flooding that ...
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3answers
87 views

Replicate stepper motor with gasoline engine

For those unaware of what a DC stepper motor is, it boils down to an electronic motor where the rotation can be precisely controlled, i.e. you can control the rotation of the motor in fractions of a ...
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1answer
75 views

hydraulic Motor/pump minimum speed

I have seen in many data sheets of Hydraulic Gear motor a spec called : "Minimum Speed = 450 RPM" ( 450 is an example) here is a capture from the linked datasheet below : In your experience ...
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1answer
40 views

How would you go about calculating the force required for an actuator to lift a bridge?

I have been trying to come up with the optimal way to calculate the force required for an actuator to be able to lift a bridge 90 degrees. (A drawbridge) The actuator is placed as follows: (The bridge ...
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0answers
15 views

Fitting a gaussian shaped nozzle into check valve piston?

So, for my downhole hydraulic internal cutter tool, I have the following parts: Top sub, body, piston, nozzle, O-rings, knife pins, knives and a bottom sub. I am trying to use a gaussian shaped ...
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0answers
28 views

How do I calculate Pressure drop across relief valve and then force on piston?

So, I'm designing a basic downhole hydraulic tool cutter of an OD = 5 1/2 in., and my tool contains a relief valve and a piston. I am trying to calculate pressure drop across the relief valve so that ...
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0answers
75 views

How many kWh this turbine would generate?

My grandfather and I are running some experiments down the river, however we don't have expertise in engineering so I bring up this question to the community and hope someone could help. How many kWh ...
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0answers
31 views

Reference book for hydraulic systems design

I'm looking for a good reference book on the topic of fluid dynamics/hydraulics systems engineering. I'd like a reference for simlpe/estimate calculations on things like major losses (pipes), minor ...
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0answers
22 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 ...
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1answer
23 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 ...
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1answer
76 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 ...
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1answer
40 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 ...
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0answers
197 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 ...
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2answers
73 views

The Cavitation Problem

I'm new here and would like to ask where the cavitation would happen in my design. Thanks
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1answer
149 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 ...
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1answer
40 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 ...
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0answers
37 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 ...
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1answer
45 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....
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6answers
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 ...
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2answers
80 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 ...
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1answer
56 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 ...
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1answer
34 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 ...
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0answers
36 views

Static load analysis for four-bar linkage?

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 ...
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1answer
513 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 ...
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2answers
381 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 ...
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1answer
61 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 ...
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1answer
37 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 ...
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1answer
77 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 ...
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33 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 ...
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0answers
39 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(...
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0answers
25 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 ...
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0answers
28 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 ...
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1answer
63 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 ...
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1answer
38 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 ...
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3answers
85 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 ...
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1answer
29 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 (...
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2answers
166 views

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

I'm trying to get informative resource material through this.
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0answers
56 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 ...
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2answers
755 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 ...
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1answer
50 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 ...
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2answers
256 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 ...
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0answers
24 views

How can you calculate wear of steel pipe that is transferring sand laden fluid under pressure? [closed]

How can you calculate wear of steel pipe that is transferring sand laden fluid under pressure?
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1answer
72 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?
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1answer
105 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 ...
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1answer
128 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 ...
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1answer
44 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. ...