Questions tagged [hydraulics]

Questions about the flow and use of fluids.

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0
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2answers
308 views

Motors, Horsepower, RPM and Litres per minute

How do I get a rough estimate of how many litres per minute a motor can push?
0
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0answers
315 views

Can Swagelok SS ferrule be reused?

At times, the Swagelok SS Ferrules gets crimped tight into the SS pipe. In those cases, can these ferrules be forcefully removed and reused? Or was this a result of faulty installation?
2
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1answer
144 views

How Can I do punching of 0.22mm in stainless steel sheet (Sheet thickness 0.5mm)

Wanted to press punching of 0.22mm dia (Bottom) and on (top) 0.6mm dia Please suggest how can I make such die?
4
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1answer
480 views

Fluid mechanics - how to calculate flow distribution in piping network?

I am trying to build flexible, visual tool to calculate flow distribution through the piping network (mobile hydraulics). I have root node of the network which has defined flow and pressure inputs. ...
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1answer
32 views

Suppliers who write dynamical specification inside their data sheet?

I am a beginner in control system for hydraulic servo systems. The reason why I haven't started yet to do simulations of hydraulic servo system is because I have no information about the components I ...
1
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0answers
59 views

Water Valve Functionality

Before to present my question, I have to say that I'm not a hydraulic expert. I'm working on a water valve design and I found this model which work with a diaphragm and a spring. I want to consider ...
2
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1answer
94 views

Need help identifying component on hydraulic schematic

I'm relatively new to hydraulics, and I'm trying to understand this schematic. I've got the majority of the system figured out, but I cant for the life of me understand what the symbols at positions ...
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0answers
32 views

Device to balance water pressure

I have a situation where I have two water supply lines and both need to be the same pressure. One of the lines is normally always a little higher than the other, but by different amounts depending on ...
1
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1answer
56 views

possibility for hydraulic accumulator with no moving parts?

Some background for context only I am in the process of designing a pressure system where my pressurized fluid needs to be kept incredibly clean, with typical contaminants at the ppt or below level. ...
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1answer
165 views

hydraulic diameter

QUESTION: I needed help here, I tried solving but still can't prove or arrive at the conclusion. my working:
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1answer
56 views

Managing water supply pressure to a building

I am planning to supply drinking water only (not bath or sanitation or washing) from a tank on a 10-storey building. The problem is that if a gravity feed is used, then the pressure will be ...
2
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1answer
90 views

Difference in flow measurements in an open channel

I'm undertaking a civil hydraulics question. It involves the flow of water in an open channel down a river at $5m^3/s$ until the flow is split in two by a weir acting as a sluice gate allowing flow ...
1
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1answer
763 views

Calculating piston force for pneumatic vs hydraulic

I'm trying to calculate piston force pressures for double acting pistons for pneumatic and hydraulic pressures. I found the following formula for calculating both $$\text{Force} = \frac{\text{...
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4answers
485 views

Why to avoid low and high fluid velocities in hydraulic systems

I know that different geometries of piping, orifices etc... have different critical Reynolds values. If the value is exceeded laminar stream will turn to a turbulent form which causes a variety of ...
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1answer
93 views

How do you get a closed vessel to >90,000 psi internal pressure

Im trying to build a cold isostatic press with a internal vessel area of 300mm3. A cold isostatic press forms green metal components using pressures greater than 90,000 psi. Using an oil or water/...
1
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1answer
78 views

Hydraulic Arm - Handbrake

I am researching a system that appears to have a hydraulic arm with some kind of "handbrake" as pictured below: System Description: Table that can raise and lock into place Locking mechanism ...
1
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1answer
97 views

What material properties matter when selecting a material to withstand a specific pressure (as a sealed tank)?

I want to design a tank to hold liquid propane. The proposed tank would have one inlet valve, one output valve, and no sharp edges. I've read that the pressure required to maintain propane in a liquid ...
1
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0answers
3k views

Significance of the Sommerfeld number

The Sommerfeld number can be written as $$ S = \frac{6 \ \mu \ U \ b}{p \ c^2} $$ where U: Velocity b: Width p: Pressure c: Minimal Clearing $\mu$: Absolute Viscosity As far as I'm aware, it may ...
2
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1answer
335 views

Hydraulic System design help/ directional valves

Default Hydraulic solenoid valve issue Hello all, I'm having a weird issue with some solenoid valves in a simple hydraulic circuit, let me try and describe the situation as best as I could.. So ...
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1answer
658 views

Why is pressure head ignored in open channel flow?

Also, what does this excerpt from Wikipedia mean However, since with open channel flow, the water surface is open to the atmosphere, the pressure term between two points has the same value and is ...
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3answers
268 views

How can a car can be lifted using hydraulic press?(Pascal's Law)

The above pic is describing the system how the car will be lifted if car is placed on the larger piston. But if the small piston is moved through 1m (say) ,then the piston is merely moved by ...
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2answers
448 views

Darcy-Weisbach Equation

I've come across two forms of the Darcy-Weisbach Equation, and each one seems to yield a different result when I am solving for $Q$ (flow). $$h_{f}=\frac{\lambda Lv^{2}}{2gD}$$ $$h_{f}=\frac{f LQ^{...
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1answer
146 views

Hydraulic pump choice - which produces most force

I have a choice of two hydraulic power units with specs as follows: A. 2.2kW motor, 8lpm flow rate, 120 Bar pressure rating B. 1.1kW motor, 2lpm flow rate, 200 Bar pressure rating Using F=PA I ...
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0answers
3k views

Calculating discharge on the pipe diameter and the pressure?

Is it possible to сalculate discharge / flow rate on the pipe diameter and the pressure (for constant pressure)? For example: Pressure_internal = 5 bar, ...
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3answers
425 views

Boat Hull Drag in Shallow Water

I paddle several different types of small craft in the ocean and bays near my home. One phenomenon I've observed is beyond my understanding of drag on a narrow displacement hull. When paddling in ...
2
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1answer
252 views

Linear force multiplication (or division) without hydraulics

Gears are used to transfer power between two rotating shafts, either by increasing or decreasing the angular speed, with a corresponding inverse change in the torque. If I want to do the same for ...
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0answers
45 views

Water distribution - sizing weir buildings

I have a building to evenly split a water stream into two: Water flows into central chamber, over two weirs of equal height and length into two chambers and from there into pipelines. I'm looking for ...
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1answer
559 views

What is the difference (if any) in capacity factors and efficiency between reservoir hydropower and run-of-river power plants?

My question is about differences between reservoir-hydropower and run-of-river power plants. Are run-of-river plants less efficient? what would be an approximate guess of the differences? (assuming ...
-1
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1answer
338 views

Some questions about liquid nitrogen cooling [closed]

I am currently tinkering with a railgun experiment, and I was thinking of using a liquid nitrogen loop to cool the rails down to very low resistance, and inject some nitrogen into the barrel between ...
2
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1answer
149 views

Does this exist - Water flow control with energy recovery

Classically, if you have free flow (high level to low, no pump) between two vessels you want to control you use some restricting orifice, or flow over a variable height weir. Both dissipate energy. ...
3
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1answer
662 views

Hydraulic Symbols

Hi all!, I am currently working on a hydraulic project. One of the procedure requires me to setup a line as shown in the picture. I am fairly new to this field, I am not sure what does the symbol ...
2
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0answers
234 views

ABS Traction control / fiddle brakes

I have an 4x4 which I have heavily modified, the only thing missing is mechanical differential locks. I think it wouldn't be too hard to fit a four channel abs pump from another vehicle and produce my ...
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2answers
1k views

Reverse float shutoff valve

I have an application that is drawing fluid from a reservoir via a standard dip tube. This application has a special requirement that once the fluid is depleted from the reservoir, the pump pulling ...
2
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1answer
83 views

How do I recognize a good Hydraulic Servovalve? [closed]

How do I recognize a good Hydraulic Servovalve? It is probably the frequency response but what do I have to look for in these diagrams? Is it correct to assume that the higher the frequency at a ...
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1answer
91 views

How to mount an O-ring differential pressure sensor in a pipe

I am trying to figure out the best way to connect an O-ring mounted differential pressure sensor into 1/8" female NPT. Ideally would like to do it with something like aluminum tubing, but I'm not sure ...
5
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0answers
39 views

Bedload discharge for canals of triangular cross-section

All the methods I know of for calculating bedload discharge are for canals of rectangular cross-section (constant depth of flow). The bedload is first computed for a unit of width (using the constant ...
4
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1answer
3k views

Where exactly will a hydraulic jump occur?

I know that an hydraulic jump can occur only when the Froude number is higher than 1 (supercritical flow), and I am familiar with the Bélanger equation. However, I feel like I have a fundamental ...
14
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3answers
244k views

How to calculate flow rate of water through a pipe?

If a water pipe is 15 mm diameter and the water pressure is 3 bar, assuming the pipe is open ended, is it possible to calculate the flow rate or water velocity in the pipe? Most of the calculations I ...
2
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2answers
686 views

Why no hydraulic piston gas compressors?

I've been looking at solutions to compress gases and getting stunned by the cost and maintenance requirements of existing systems to fill cylinders (whether for SCBA or chemical storage) to 2000-...
7
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2answers
371 views

On a Diesel/hydraulic DMU train what exactly does the “go faster” lever control?

Let's say that you are driving a Diesel Multiple Unit† with either mechanical* (i.e. an actual gearbox with multiple ratios) or hydraulic (i.e. two or more torque converters) transmission. When you ...
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1answer
155 views

Help with hydraulic design

I made a waterfall hoping to use water as a piston for suction. I'm wondering if some of you could help explain why it's not working the way I was expecting. This is the basic design: I have a 4 ...
0
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1answer
652 views

What options are available to create a vacuum with hydraulics? [closed]

What options are available to create a vacuum using hydraulics? I am working on constructing a small planter which needs a vacuum to operate. Planters operate best at a pressure of 10 PSI. I ...
5
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4answers
708 views

How do I add a resistance to mechanical movement in both directions, apart from friction?

What options do I have for creating a resistance to a mechanical movement apart from simple friction? Assume I have a lever, which will result in either circular or linear motion. I want to be able ...
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2answers
97 views

Hydraulic cylinders [closed]

As part of my final year project, I am designing a racehorse simulator. I want to use 2 hydraulic actuators - one at the front and one at the back to simulate jumping. Does anyone have any ...
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2answers
1k views

What causes circular hydraulic jumps in kitchen sinks?

My understanding so far is that a jump occurs when the Froude Number $\left(Fr=\frac{v}{\sqrt{2gh}}\right)$ of the radial flow falls with a decreasing velocity due to friction and viscosity; and the ...
7
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1answer
132 views

Which is more durable in sandy desert conditions: electric motors or hydraulic pistons?

If we have a tracking system placed in a tough desert environment with occasional sandstorms and temperatures that go as high as 50C, which actuator would be better: a hydraulic piston or an electric ...
2
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2answers
185 views

What is the best way to dry something that is quite thick?

I wonder what is the best way to dry something that is quite thick. The gravity will attract the water down, but the sun will "elevate" the water. So I can choose to flip the object every 30 min so ...
10
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2answers
602 views

Hydraulic siphon spillway entry and exit velocity magnitude and profiles

I am working on the hydraulic seawater flow though a siphon spillway. My task is to determine at a location in front of the spillway the flow velocity and profile when The flow enters the spillway ...
5
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1answer
212 views

Minimising permeation rate of hydraulic fluid through hydraulic hose

I am designing an experiment where the hydraulic hose is going to be subjected to relatively high internal pressure for prolonged period of time and it is absolutely imperative that the rate of ...
8
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2answers
13k views

Force required to crop/cut a mild steel bar

I have cropping/cutting wedges with a thickness of 4 mm cutting either side of a round mild steel bar (17.5 mm). Imagine two wedges being driven together with a round mild steel bar in the middle (...