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. gfd43tg

    What is the Force Exerted on Supports Holding a 90 Degree Reducing Bend Pipe?

    Homework Statement A 90 degree reducing bend has an inlet diameter of 4 in. and an outlet diameter of 2 in. If water enters the bend at a pressure of 40 psig and a flow of 500 gpm, calculate the force (net magnitude and direction) exerted on the supports that hold the bend in lace. The loss...
  2. S

    Fluid dynamics, Pipe Flow, Hagen Poiseuille, Darcy's equation

    Homework Statement A water injection line is made from smooth capillary tubing with inside diameter D = 25.0 mm . If the length of the pipe is 0.75 m and assuming laminar flow is present up to Re = 2000, find (i) the maximum average velocity at which the flow is laminar (ii) the pressure...
  3. T

    Finding the convection of a node in a hot pipe

    Homework Statement I just completed a lab in class where we heated a copper pipe and measured the temperatures at 25 different locations. Each of these locations is called a node. The goal is to find the convection losses by using the First Law (qc1 + qc2 + qc3 + qc4 + qrad + qconv = dECV/dt)...
  4. M

    Organ Pipe Resonance - How long is the pipe?

    Homework Statement An open organ pipe has a fundamental frequency - corresponding to the first resonant length -of 262 Hz. The room temperature is 20.0°C. What is the length of the pipe. [The answer is 0.66m] Given: 262 Hz and 20°C Homework Equations v = 332 + 0.59t v = f λ...
  5. O

    Pressure Calculation for Flow Through a Changing Diameter Pipe

    I have a flow through a pipe that changes in diameter to become narrower. I can measure the pressure P1 at the wider end where it is applied and I want to calculate the pressure P2 at the narrow end. I can't directly apply Bernoulli's equation here because I have no way of measuring the flow...
  6. V

    Twin turbo intercooler pipe merge using air ejector design

    I'm converting my turbo system from a single turbo to a sequential twin turbo system. Where the two turbos intercooler pipes join, the flow from the first turbo to spool can easily reverse back through the second turbo to spool, unless you have a one way valve like a swing check valve to stop...
  7. R

    Large Sign. Need help calculating pipe size.

    Building a large sign. I've attached a drawing of what I'm doing. I need to make sure that 8-5/8 pipe is sufficient for sign. I live in Oklahoma and we get some nasty winds as well. Please help. Any suggestions greatly appreciated.
  8. S

    Sig Figs query for a steady flow pipe

    Homework Statement First let me say I'm new to lab reports at Uni, and I'm dreadful at them... I'm having issues with how many sig figs to correctly display on a data table for an experiment I've done to investigate the Reynolds number. One particular step is to find Δp at different stages on...
  9. karush

    MHB What is the Longest Steel Pipe That Can Be Carried Horizontally Around a Corner?

    A steel pipe is being carried down a hallway $9\text{ ft}$ wide. At the end of the hall is a right angled turn into a narrower hallway $6\text { ft}$ wide. What is the length of the longest pipe that can be carried horizontally around the corner assume that $\displaystyle...
  10. steves1080

    How many Watts do I need to heat this pipe?

    Reference attached image. In this simple system, I have a large reservoir of water that feeds a small section of 4" dia. pipe. There is about 1 ft of length until there is a gate valve to isolate the flow. When not flowing water, this 1-ft x 4-in section is at risk of freezing when...
  11. J

    Pipe size and diameter connecting hydraulic pistons

    Hi everyone, In the attached diagram there are two hydraulic systems. The cylinder areas for each system are the same. The only thing that is different between the two systems is the pipe joining them, system B having a much smaller ID. Pascals law states that these two systems would act...
  12. D

    Preventing Pipe Freeze in Cold Weather

    Hi Guys, I am not an engineer and was hoping someone could help me with a question I had about piping in cold weather. I am setting up a temporary 4" Bauer water pipe that I need to keep from freezing. It will be outside (non insulated) in February in Ohio. I am expecting temperature...
  13. S

    Determining Flange Rating for a 316 SS Pipe

    Homework Statement What is the appropriate flange rating for a 316 stainless steel pipe carrying saturated steam at a temperature of 180°C Homework Equations I'm not quite sure to be honest. The Attempt at a Solution Could somebody give me the general approach to determining the...
  14. S

    Mean velocity for turbulent velocity distribution in pipe.

    Homework Statement Calculate the mean velocity (um) for turbulent velocity distribution in a pipe. Homework Equations um = Q/A u = umax(y/R)1/7 (Gives velocity at a specified point in cross section of the pipe. R = pipe diameter. y = distance from boundary layer. umax = distance at...
  15. N

    Bernoulli's Equation and pipe reducer

    Homework Statement For the pipe reducer shown in Figure 6.27 in your textbook, the pressure at point A is 45.8 psig and the pressure at B is 39.5 psig. Calculate the velocity of flow, in ft/s, of the water at point B. State your answer to one decimal place. Example: 25.6 Homework...
  16. S

    Spring constant of a bent pvc pipe

    I am calculating the initial velocity of a released pvc pipe after it has been bent. I would like to know if i have this correct. Potential energy = Kmgh; I have my mg and it is 50N, so PE = k*50*h; I have been told that k is the spring constant of my bent pvc pipe. Therefore since I have...
  17. C

    Frequencies of Small Oscillations for a Hoop Rolling in a Pipe

    Homework Statement A hoop of mass ##m## and radius ##a## rolls without slipping inside a pipe of radius ##R## (the motion is 2D). Write down the kinetic and potential energy. Hence find the frequency of small oscillations about equilibrium. Homework Equations Moment of inertia of a hoop...
  18. G

    How Do You Determine Pipeline Pressure with a Faulty Manometer?

    Homework Statement You are given an open-ended mercury manometer and asked to determine the pressure in a pipeline that supplies feed gas to a reactor. However, when you connect the manometer to the pipeline, you notice that the calibration markings in the leg that connects to the...
  19. ArcanaNoir

    Dream Chalk (not a pipe dream anymore)

    I have recently purchased a box of Hagoromo Fulltouch chalk, the so called "dream chalk". It has only been available for purchase in the US since spring 2012, but its merits have been known for longer. So heads up, heavy chalk users :) I'm posting because I am looking for a picture I thought I...
  20. R

    Magnetic Field (Hollow Copper Pipe)

    Homework Statement The figure below shows a long, hollow copper pipe. The inner radius of the pipe is a and the outer radius is b. A uniform current I flows in the walls of the pipe. You may assume that the permeability of copper is the same as free space, that is, ##\mu_0##. Use the...
  21. S

    Calculating buckling strength of steel pipe for non-axial load

    Hello All, I am in the process of creating a 33' tall chaotic pendulum, and cannot find any calculations for the buckling strength of pipe. The pendulum swings from side to side, but is stopped as it goes too far one way or another by a limiting cable attached to a sleeve over the pendulum...
  22. S

    Can a Universe-Sized Rubber Pipe Exist in Two States at Once?

    I was thinking of this problem recently and thought it'd be best if I got an answer from a physicist (or anyone else who'd know how to solve this). Imagine a thin rubber pipe about a meter long. Holding each end of the pipe with both hands (respectively), you bend the ends inwards to form a...
  23. I

    How does a two open ended pipe resonate?

    For a pipe with both ends closed, with sound being produced from one end, sound is reflected off of the other end and is able to produce a standing wave, however, for pipes with both ends open or one end open, how can the air inside this pipe resonate? or is it not really there air inside that...
  24. P

    Bernouilli's principle pipe flow problem

    Homework Statement On a horizontal pipe with flowing water on point 1 there is a vertical pipe with water up to some point. On another point 2, we have a pitot tube (L shaped) against the water flow and the lever on the vertical part is higher that on point 1. If the water flow stops what...
  25. E

    Fluids Problem - Dimensional analysis, pipe flow, propeller

    Homework Statement I have a tutorial question I have been struggling with. The problem is: The flow through a closed, circular sectioned pipe may be metered by measuring the speed of rotation of a propeller having its axis along the pipe central line. Derive a relation between the volume...
  26. M

    Fluid Dynamics–Find pipe diameter,head loss & actual mean velocity.

    1. Homework Statement a) Calculate the theoretical diameter of pipe, nominal pipe diameter and mean velocity of nominal pipe diameter. Maximum velocity = 1.8m/s Q(vol. flow rate) = 0.01M^3-1 b) Find the Reynolds number for the process and then the head loss due to friction, state any...
  27. gauss44

    How can sound move faster in one pipe than another? If both in air?

    (A question from The Berkeley Review MCAT prep book. The book gives the answer in the form of the equation below. I'm still having trouble figuring out how an example of this would look in real life. If someone would provide a hypothetical narrative where the following could take place, that...
  28. J

    Beam Deflection in a Tapered Pipe

    I need help comparing the deflection of pipe with two different cases. Case 1 is a regular non-tapering pipe. The case 2 is a tapered pipe that should deflect less than the straight pipe. I am working in MathCad and can change the value of my variables, so I have set the two cases to be equal...
  29. M

    Time to achieve specific heat transfer for fluid flowing in a pipe

    I am currently in the process of designing a section of pipe in which a fluid will flow within, and would like to determine the specific heat transfer which may occur once the fluid enters the pipe, until it exits. The fluid will be flowing at a constant velocity "V" at a Temperature "T1" at...
  30. M

    Pipe Pressure Increase: Investigating Unit Ventilator Valves in Reverse Loop

    Did an experiment in a school's heat system. Turned off the unit ventilator valves all at once. The pipe pressure raised significantly causing the circulation pumps to back off. Some notes, this is a reverse return loop, hot water flowing (not steam), unit ventilators are 2-pipe. Question...
  31. T

    Velocity of a fluid within a pipe

    Homework Statement A scientist attempts to model the flow of blood through an artery using a hollow pipe of diameter 1.8cm. A fluid density 1060kg/m^3 is used to simulate blood in the pipe. Viscous effects can be considered to be negligible. TO study a blockage in an artery, the...
  32. S

    Bernoulli's equation and water pipe

    Hi all I'm trying to teach myself a bit of bernoulli's principle but i am struggling. I'm pretty sure I need to use a combination of bernies equation and continuity equation but I get lost when trying to rearrange to find velocity. Water moves through a constricted pipe in steady, ideal...
  33. A

    Von Mises Stress Calculation for Internally Pressurized Pipe

    Problem Description: Internally pressurised pipe elbow with open ends. I have to compare the Finite Element Von Mises stress with that calculated by hand. I am having issues calculating this. The formulae that I am using are: Hoop Stress: σ_1 = \frac{P*d}{2*h} Where: P is pressure...
  34. W

    Design Strong Water Pipe: Physics of Milking Smoke

    I'm new here but after a recent break of a brand new piece of glass, I want to design a new one and get it custom made. I have two things that I want for this design: I want the glass to be strong enough that just tipping it over won't break any part of it and I want a light slow suck at the top...
  35. Z

    Force of a water flow through a U-shaped pipe

    Homework Statement Water flows at a speed of 0.75 m / s through a U-shaped tube whose cross-section is circular with a radius of 10 mm. How large is the force F to be to compensate for water power on the tube? Homework Equations I am not sure. Perhaps; Pressure=Force/Area...
  36. M

    Trying to measure gauge pressure in a water pipe (under 1 psi)

    I'm trying to measure and regulate gauge pressure in a pipe that has water flowing through it, but I need the pressure to be about .75psi (1.8 ft H2O). Most dial gauge ranges are too high and not accurate enough. Pressure transducers I've had no luck with as far as finding one that's inexpensive...
  37. Q

    Modal energy distribution in closed pipe resonance

    When one causes the air column in a closed pipe to vibrate in its well-known modes (harmonics) or a plucked string to vibrate similarly, how is the exciting energy distributed amongst the modes?
  38. B

    BTU transfer of stainless steel pipe

    I know this is a complicated question, and depends on a lot of factors. So, I will do my best in explaining the situations. I am trying to regulate the temperature of a pool of circulating water. I have 8' of stainless 304, 1" OD, 14 awg, pipe, positioned against the flow of water (to provide...
  39. C

    Beam of particles in a cylindrical pipe

    Homework Statement Charged particles, each holding charge q are moving in a cylinderical beam centred on the x-axis with n particles per unit volume. All the particles have the same horizontal velocity v. A) By considering a suitable Gaussian surface, calculate the E-field as a function of...
  40. W

    What is the method for solving a steel pipe around a hallway?

    Homework Statement Homework Equations Trigonometric identities and differentiation The Attempt at a Solution It's pretty simple to solve this question when the hallway is a right angle. Differentiating -6cscθ + 9secθ and setting it equal to zero and solving will yield the proper...
  41. D

    Air flow pipe size reduction|Incompressible&Lossless COMPLETED ANSWER

    Homework Statement Q4. A horizontal air duct reduces from 0.75 m2 to 0.20 m2 . a) Assuming no losses and an incompressible fluid, what pressure change will occur when 6 kg/s of air flows through the duct? Use a density of 3.2 kg/m3 for these conditions. b) Is the incompressible...
  42. B

    Sequence of insulating layers of different conductivities for pipe

    Homework Statement Two insulating materials of thermal conductivity K and 2K respectively are to be used as two layers of insulation for lagging a pipe carrying hot fluid. If the radial thickness both the layers is to be same, then - i) the first material (thermal conductivity K) should be...
  43. C

    Why is fluid velocity unaffected by a change of pipe roughness here?

    I had no luck in the coursework forums though I guess the question becomes simpler if I state it the way I did here. Assuming no complex network, or just a single pipe first feeding the network, why do the speeds in the pipe and even the rest of the network pipes remain unaffected if I change...
  44. S

    Frequencies of standing wave in pipe

    Homework Statement A speaker is placed near the open end of a 0.5m pipe (closed on the other end). what is the speed of sound if the pipe resonances at 600Hz for n=2? Homework Equations fn=(2n+1)*V/4L Or? fn=(2n-1)*V/4L The Attempt at a Solution I saw both versions of the...
  45. A

    Principal Virtual Work Theories - Cylindrical Pipe Application

    Dear All, I did post this issues in the physics forum, however there is somebody ask me to post it in the engineering forum. With this I re-post it here. Does anyone here familiar with a theory called Principal Virtual Work (Equilibrium theory) ? I read somewhere that with this theory, i...
  46. A

    Principal Virtual Work Theories - Cylindrical Pipe Application

    Dear All, Does anyone here familiar with a theory called Principal Virtual Work (Equilibrium theory) ? I read somewhere that with this theory, i could relate(for pipeline application - collapse & buckling) the components for ovalisation, external pressure and hoop strain. Appreciate if...
  47. B

    Shear calculation for round pipe

    Can someone please help me. I have a pipe 200mmOD x 160mmID welded to a Steel structure The pipe is 100mm long with a 12mm plate x 250Dia welded at the end of the pipe. The steel structure weighs 7500Kg I have to lift the structure with a crane. The crane has a cable with a loop which can...
  48. D

    Help a College Student With Pipe Flow Calculations

    a newbie here so not sure if this is in the right place! i'm in the middle of a paper that I'm doing for college, investigating the effects of roughness on air flow. i set up 2 pipes, 1 rough and 1 smooth (800mm long, 36mm diameter), in a wind tunnel, measured the velocity of the air entering...
  49. A

    Rolling resistance, stiction calculation for pipe roller

    My ultimate goal is to spec a motor for a shop tool. It is a stand to rotate a glorified pipe. The pipes are quite large (up to 19,000lbs). The pipe will sit on four wheels. Two of the wheels are motorized. I have a good idea of the torque/hp needed to accelerate to the desired angular velocity...
  50. C

    Pipe design help. Know Q and ΔP, need to find D

    Hi all, Need help determining what size diameter for some pipe. I just want someone to check my calculations, hopefully they're okay. I attached a quick sketch of the set up. Here are the knowns: Qmin = 4000gpm ΔP = 32psi L = 65ft e(roughness of commercial steel pipe) = 0.00015ft...
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