# What is Pipe: Definition and 1000 Discussions

A tobacco pipe, often called simply a pipe, is a device specifically made to smoke tobacco. It comprises a chamber (the bowl) for the tobacco from which a thin hollow stem (shank) emerges, ending in a mouthpiece. Pipes can range from very simple machine-made briar models to highly prized hand-made artisanal implements made by renowned pipemakers, which are often very expensive collector's items. Pipe smoking is the oldest known traditional form of tobacco smoking.

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1. ### Air flow measurement in a pipe

Dear friends. It's my first post here and sorry if it's in wrong place. I have a system with a diaphragm pump and a filter to collect dust. I need to set the flow (like 1 liter per minute) and I need to keep this flow constant during long time. The dust obstruct the filter and I need to make...
2. ### Joint physics - hose/pipe connection

Hello, Did a simple study at work recently and was confounded by the results. Hoping for a simple explanation…. Consider a pipe is inserted into a hose and a clamp is tightened over the connection. The pipe has a groove and the hose has a bead. To complete the connection the hose bead is...
3. ### Calculating the inlet lengths of a fluid circulating in a pipe?

TL;DR Summary: why do we need input length in fluid's dynamics What is the purpose of calculating the inlet lengths of a fluid circulating in a pipe? and how to calculate it correctly? why do we need it in engineering? This is for a class project where we are asked to calculate it and I think...
4. ### What is this pipe on my boiler, and why is it leaking?

A house inspector has noted this leak in our boiler. I don't know what this pipe is for. It seems to have some sort of steam release valve on top and it vents right out onto the basement floor. Help! Prospective buyers want to know why our boiler is leaking.
5. ### Pressure in a gas container measured with a barometer and a U pipe

Can someone please tell me where I am wrong, here goes the question: to a container filled with gas, U shaped pipe is attached, as shown in the picture(picture below). What is a gas pressure in the container if the height of the pillar of mercury in barometer is 740 mm? The way I solved it is...
6. ### Calculating turbine RPM in a pipe with known air velocity and diameter

Hello, I am trying to calculate the turbine RPM for a turbine in a closed pipe. I know the air velocity and pipe diameter. Can this be done?
7. ### Static hydraulic pressure in a pipe

My Question: Two pipes filled with water and caped at one end, they have the same diameter, but different lengths. One pipe is 10 feet long and the other pipe is 1,000 feet long. At the other end of both pipes a piston applies an equal amount of pressure on the water in the pipes...
8. ### Bernoulli equation and parallel pipe branch

Hello! I have a question regarding the application of the bernoulli equation and calculation of the flow through a parallel pipe branch. It's more the basic understanding how the flow will establish. You can find a sketch attached to follow my explanation. Let's assume I have a pipe with...
9. ### Fluid Dynamics Question -- Water flowing through a pipe into two cylinders

Because my little work project involves fluids I thought this the best topic to post under. I took the route of biological sciences and computer science. This area is out of my league at the moment I'm not sure the amount of time that would be required to get the material applicable to this...

11. ### Heat Flow in a Pipe with integrated Sensor

Hello, I have the following problem and hope you can help me. I have the setup as shown in the drawing. A pipe that is flowed through, and in the middle of it another pipe, but at the end of this branch is a sensor. Initially the fluid would flow, with a temperature of 25°C. If my thought is...
12. ### Calculate deflection of rod/axlepipe due to distributed load

Summary:: Calculate the deformation on a rod/axle/pipe due to a distributed load. I’m manually trying to calculate the deformation on a rod/axle/pipe due to a distributed load. The rod has an outer diameter of 62mm and an inner diameter of 50, is 170mm long, made from a material with an...
13. ### Engineering Electrical energy to empty reservoir with a siphon water pipe

Calculation of the potential electrical energy generation of a siphon pipe, emptying an enclosed reservoir and end of siphon pipe connected to a pelton turbine with efficiency of 75% Known inputs: Height difference of siphon(Hd) = 4,5m Height lift of Siphon (Hu) = 6m Total siphon pipe length...
14. ### I Sound Frequency & Pipe Wall Thickness

We have 2 open metal tubes, made of Stainless Steel. They both are the same length of 1 metre, and and Outer Diameter of 76mm. One pipe has a wall thickness of 1.5mm, and the other has a wall thickness of 2.0mm. It was our reasonable guess that the tube with 2.0mm wall thickness, should...
15. ### Hydraulic Losses Through a Pipe

I am trying to estimate the pressure loss from a tap to a piece of equipment we are feeding water to. I have the pressure on the 12" ductile line. I have the friction losses in the different pipe sizes (1",1.5", and 2") for the service line. I also have the losses through the 1" meter. The only...
16. ### B Propagation speed of movements of a fluid in a pipe

Assume that we have a 1.5 km x 100 cm^2 long straight pipe, totally inelastic and full of water. From time t = 0, a pressure of 300 000 Pa is continuously applied to the water with a piston at one extremity. This correspond to a force of 30 000 N on the pipe cross section in the direction of the...
17. ### I Magnet through Pipe Experiment, continued

The changing magnetic field of a falling magnet induces currents in the pipe that slows it's fall through the pipe. Question: If the induced currents are decreasing the magnets descent then they must themselves have momentum. How is it dissipated once the magnet has passed through the end of...
18. ### Boundary Conditions for an infinite rectangular pipe

Does setting up the problem symmetrically on this axis and the boundary conditions applied make sense? I don't believe I will have a problem solving for the potential inside, but i just want to make sure I have my B.C and axis correct before proceeding. EDIT: Or should this be a 2-D lapace...
19. ### Cooling of a thick walled pipe transporting water

Hi everyone, I'm trying to solve the following problem but can't quite get my head around it. I have a pipe of length, L (m), diameter, d (m), the pipe walls are thick (multiple meters). I know the inflow temperature of the pipe, say, Tin (K), and the pipe's external wall temperature, Tw. I...
20. ### Evaluating the boundary conditions for a rectangular pipe

I have attached an image of the pipe in the attachmnts. The pipe is parallel to z-axis form (-∞,∞) and sides of length a. So my boundary conditions for this problem are as follows 1.) V=0 at y=0 2.)V=0 at y=a 4.)∂v/∂x=0 @ x=0 3.)V0 @ x=a I am a little confused on the fourth boundary...
21. ### Understanding how to model a non-isothermal flow through a pipe

For the fluid, I will use three conservation laws for mixture quantities (mass, momentum and total energy) and an additional equation for the void ratio (as explained in the paper "Modeling for non isothermal cavitation using 4-equation models"). If you want I can share the explicit equations...
22. ### Reflection of sound wave in an open organ pipe

I know that standing waves form in an open organ pipe. Since, standing waves can only form from superposition of original wave and reflected wave, so there must be a reflected wave in an open organ pipe. But I fail to understand how sound wave can reflect at the open end of organ pipe.
23. ### Creating a magnetic field near a pipe

I want to wrap no. 16 copper wire around 1" copper pipe to create a mag field. At 120v / 1 amp AC, how many turns will I need to get about 5 milligauss near the pipe?
24. ### Stuck on complex pipe system bending moment hand calcs

Some more details on the system are that L1 is very long (close to 100ft) and L2 is close to 30ft (the vertical pipes). The piping is all schedule 40 1/2" OD. Moment of inertia is roughly 10^-8. Components are about 2kg each. The distance of the pipes horizontally is small (around 2ft). Pressure...
25. ### I Magnet falling though copper pipe

I do not fully understand why a falling neodymium magnet is decelerated in a vertical copper pipe. It is usually explained by Lenz's law, two induced currents generate an upward force that counteracts the force of gravity. (link) However, I assume this upward force has to be generated by the...
26. ### I Transferring static charge from a Wimshurst machine to a foil pipe

Hi everyone. I am an engineer by trade (don’t hold that against me!) but I was trying an experiment for the latest of my crazy inventions and am missing some key logic in static electricity which I was hoping you could identify. Equipment 1. Wimshurst machine (like...
27. ### Find the pressure drop and power loss of pipe when elevation changes

Summary:: I can’t get the correct answers, I think I haven’t fully understand the theory behind them The answers are given in the picture
28. ### Designing an orifice plate to increase the pressure in a pipe

say for 3.013bar absolute pressure pressure ratio : P/Po = 14.7psi/43.707psi = 0.33 which means its chocked flow now i want to find diameter or area of orifice : so could anyone help me
29. ### Engineering Finding arc length of a pipe between two tanks

I can't seem to find the arclength between A and B. I tried using L = integral (0.6 to 0.4) of sqrt (1+ (dz/dx)^2) to no avail. Would it be roughly similar to 400 km (the length from A to B) since the change in elevation could be considered negligible? Furthermore, how might I go about...
30. ### A Optimum profile of light pipe exit for narrow beam angle

I am trying to design an acrylic light pipe that has a 3W power red LED input with 60 degree beam angle. I need a reasonably collimated exit light beam or at least a narrow angle output. What I'd like to know is - what is the optimum shape of the exit end of the light pipe to produce the...
31. ### Force of pressurized water exiting a hose or pipe?

Well known examples of the force produced by pressurized water exiting a pipe: JetLev Water Propeled jet Pack. Hovering Car. I need to calculate the maximum for the thrust produced when the hose or pipe is bent rearward. Since this is similar to the case of a water bottle rocket, the guess...
32. ### I Minimize supported weight of a water pipe

I’m trying to calculate the weight I have to support at one end of a pipe with flowing water. So suppose you had a water pipe that extended from the ground upwards some distance away both horizontally and vertically, i.e., at an angle. Normally, you don’t have to worry about this issue because...
33. ### How to determine the pressure drop in pipe diameter sizing

Hi all, I'm a tinkerer with no formal engineering background, but enjoy read about physics and engineering in general. I'm reading up on fluid flow and I'm a bit grasping at the concepts. As far as I understand it, flow rate, pressure drop and pipe size are all interrelated, where one affects...
34. ### Plug the Closed Ends of a Pipe at Depth and Bring it to the Surface

Hi Guys - I have very simple question but I cannot get my head around. Say if we cut pipeline into one section (12m) then close each cut end with temporary plugs Water depth is 100m. Before the cut there is seawater inside the pipeline. Now I understand there is no differentiated pressure...
35. ### Pressure change in pipe due to sudden closure of valve

Water is flowing in the pipe with velocity v0. Upon sudden closure of the valve at T, a pressure wave travels in the -ve x direction with speed c. The task is to find ##\alpha##, where ##\Delta P = \rho_0 c (\Delta v) \alpha##. The 1st step is to set up an equation using conservation of mass...
36. ### I Pipe Air Blowing - Exit Velocity of Air

Suppose an isolated pipeline of known dimensions is being filled with air from the atmosphere (via a compressor) to a gauge pressure P1=2barg. A rupture disc at one end of the pipeline blows at this pressure, and the air inside the pressurized pipeline is released to the atmosphere. The rupture...
37. ### A Can high air velocity in vacuum system create "freezing" of the pipe?

Hi folks, very simple question, but have not been able to find an answer: Assume a vacuum pump pulls air through a pipe. Also assume that within the pipe run, there is an area with reduced cross section, creating a temporary increase in air velocity. Also assume the air is very moist, and is at...
38. ### Ejection speed and travel distance of a ball in a pressurized water pipe

Diameter of metallic ball : 3.000 inches SG of ball is : 2 ID of pipe is : 4.05 inches ID of seat : 2.885 inches Pressure behind ball when released from seat #1 is 1100 psi Fluid in pipe is Seawater (above and below the ball) Fluid flow rate after ball is released is 800 litres pr minute The...
39. ### PEX Pipe in Residential Subfloor Thermal Mass

Hello friends! We are installing a future provision for a Rocket Mass-type woodstove in our home. This is a future project but realized that we could take advantage of the open area between the footing and finished floor by adding an insulated block of concrete with PEX pipes for Heating and...
40. ### Water Pressure and Different Pipe Sizes

Started an irrigation project. There are 4 points in this irrigation system; A, B, C and D. The main water line to the house is 1" diameter pipe. (Point A) The distance from Point A to Point B is approximately 30 feet. Here at Point B the pipe size is reduced down to 3/4" pipe. The distance...
41. ### Engineering Heat transfer from composite pipe -- Is my answer right?

Im practicing the questions in the problem book and seem to be getting different answers to the book can somebody check cheers. [Answers: 57.99 W/m: 1739.7 W: 84.9ºC] textbook answers A water pipe of bore 65 mm bore and 6mm wall thickness, carrying water at 85ºC is insulated with one layer of...
42. ### Vortices and turbulence in square vs round pipe

Greetings, I am about to start experimenting with misnamed rocket stoves and rocket mass heaters. I say misnamed because I think the velocities are too slow to be rocket science. (Why would I experiment with these? Because I have cement, perlite, and reinforcement materials at hand and I just...
43. ### Rate of heat flux from from hot gas in a pipe to water outside

I have solved the first 2 parts. For the 3rd part, I have obtained the equation: T(x) - T0 = (T1 - T0)e^(-Φx/fc), where f = fm in the question. How do I obtain that expression for H? Thank you!
44. ### Does Watt's Law apply to flowing water in a pipe?

Is the heat generated by flowing water in a pipe proportional to the product of the rate of flow and the pressure drop across the section of pipe in question, analogous to an electrical circuit? If so, what units would you plug into get an answer in watts?
45. ### Fluid dynamics calculation -- Draining a barrel through a pipe

v1- velocity of water at the top of the barrel v2- velocity of water at the the pipe (bottom of cylinder) p + (⍴ *(v1)^2)/2 + ⍴gh=p + (⍴ *(v2)^2)/2 + ⍴gh atmosferic pressure cancels out (⍴ *(v1)^2)/2 + ⍴gh = (⍴ *(v2)^2)/2 + ⍴gh density doesn't affect the result(cause its in every term)...
46. ### What is the leakage rate of my underground piping system?

This is a situation I don't often deal with; I have an underground piping system that is failing a pressure test and losing pressure at a rate of about 1psi/min from 80psi. I'd like to calculate the leakage rate. The pipe is a simple 10" diameter, schedule 40 steel pipe, 500' long (0.365"...
47. ### Resonant frequency of a pipe submerged under water

How do I calculate a resonate frequency of a length of pipe submerged totally under water? Do I just take speed of sound in water which is 1,481m/s at room temp, and decided it by length of pipe in meters multiplied by 4? so at 20 celsius water and 20cm pipe it would just be: 1481 / (.2 x...
48. ### Estimating head loss from pipe slope?

I am trying to calculate head loss for a sloped pipe. I found this calculation here, which seems to be what I want..or at least a start: https://www.pumpsandsystems.com/pumps/april-2015-calculating-head-loss-pipeline My confusion/skepticism arises from the fact that the equations in the above...
49. ### Fluid velocity and pipe diameter using the continuity equation

Hi, Can anyone let me know if I had done this Q correctly? Thanks for any help!
50. ### Best way to measure non-thermal expansion of a pipe

Ideally, the method should be accurate down to 0.01 millimetres or better. We're probably talking pipes of up to 150 mm (6") diameter. Accurately measuring the actual diameter of the pipe is of less importance - it's how much it expands that matters. My idea is wrapping something around the...