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. N

    Bullet camera in PVC pipe condensation problems -- Help please

    I had to installed some IP bullet cameras in some PVC pipe on a Hopper dredge to protect it from the salt water spray. They are outdoor cameras but they are made out of aluminum and they will rust if left unprotected. I sealed them in the pvc and used a cgb from the wire as well as sealant on...
  2. T

    Water Flow Through a Pipe w/180° Horizontal Elbow

    Homework Statement Water flows through a circular pipe with a 180° horizontal elbow and exits to the atmosphere through a nozzle as shown in Fig. Q3. The diameter of the pipe is 300 mm and the diameter of the nozzle exit is 160 mm. The density of water is 999 kg/m3 . The mass flow rate of...
  3. T

    How Does Pipe Configuration Affect Pressure in a Fluid System?

    < Mentor Note -- thread moved to HH from the technical engineering forums, so no HH Template is shown > The system shown in the figure below consists of L = 60 m of D = 50 mm diameter cast iron pipe (k/D = 0.004), two 45° flanged long radius elbows (K = 0.25) and four 90° flanged long radius...
  4. L

    Fluid Mechanics- inviscid fluid pressure in a pipe

    Homework Statement Water flows through a circular pipe with a 180° horizontal elbow and exits to the atmosphere through a nozzle as shown in Fig. Q3. The diameter of the pipe is 300 mm and the diameter of the nozzle exit is 160 mm. The density of water is 999 kg/m3 . The mass flow rate of...
  5. L

    Directions of Friction Force (Pipe)

    Homework Statement The 4000N concrete pipe is being lowered from the truck bed when it is in the position shown: If the coefficient of static friction at the points of support A and B is 0.4, determine where it begins to slip first: at A or B or both at A and B Homework Equations It's not...
  6. P

    Solving 3D Compressible NS for Cylindrical Pipe

    Can somebody provide a solution for this question? convert 3 dimensional unsteady compressible NS equations to axisymmetric 2 dimensional incompressible laminar form for a cylindrical pipe, then make a derivation of streamwise velocity profile u(r) using the appropriate boundary conds. thanks
  7. adisabeba

    I get a shock when touching water pipe

    I am living in an apartment and suddenly we started to get an electric shock, at random, when touching a water tap. Since I am an Electrical Technician, I started my research on the origin of the problem, and after carrying out a series of tests I found out 'at the end' that turning off all...
  8. galadriel3562

    Centrifugal and centripetal forces on a half pipe

    Homework Statement The problem is as follows: A skater started at the top of a halfpipe that makes a 40 degree angle with the horizontal. He is now about halfway down the pipe and represented by the rectangle. His center of gravity is represented by Z, the midpoint of the circular movement...
  9. C

    Why did we need a 8.3 T magnetic field in the LHC beam pipe?

    I tried to work backwards and verify the magnetic field required by the LHC beam pipes. A circumference of 27km implies a radius R=4300 m. The beam energy E is 7 TeV per proton beam. Considering approximation E approximately equal to pc to get momentum (ultra-relativistic case). Plugging into...
  10. Greg Bernhardt

    What is This Pipe? Capping Ideas for Old Gutter Drainage

    I found this drain pipe covered with leaves and earth. It might be from old gutter drainage. Any ideas on capping it?
  11. C

    Calculate CFM on Hydrogen Vent Pipe

    I have a large hydrogen storage tank that vents when the pressure exceeds 150 PSI. I am trying to get a rough calculation of how much hydrogen we are losing. I know it is a 2 inch pipe and the pressure drops from 150 PSI to 120PSI. The venting lasts between 2 and 5 minutes. How do I...
  12. moenste

    Find fundamental freq. and 1st overtone closed each end pipe

    Homework Statement Calculate the frequency of: (a) the fundamental, (b) the first overtone, produced by a pipe of length 40 cm which is closed at each end. (Velocity of sound in air = 340 m s-1.) Answers: (a) 425 Hz, (b) 850 Hz 2. The attempt at a solution L = 0.4 m, v = 340 m s-1 (a) f1 = ...
  13. morrobay

    Submarine Outfall For Storm Water Drainage Pipe

    Would a water pump for pressure be required for a submarine outfall for storm water drainage ? Diameter of pipe 2 meters Gradient 50 Horizontal distance from shore to outfall 200 meters depth about 16 meters, sine 50 Or would the pressure from gravity gradient be sufficient to overcome...
  14. T

    Why don't we just block off the exhaust pipe to prevent CO2

    If you were to put a cap on your exhaust pipe your emissions will reduce thus you would solve the whole paranoia of climate shenanigans.
  15. R

    Why Do the Last Two Sprinklers Have a Smaller Spray Pattern?

    A question was posed to me with the following diagram. http://imgur.com/6ltYKd5 11 Sprinklers, in series with identical heads, but 10 and 11 displaying a much smaller spray pattern. 1. Is this possible, and under what circumstances. 2. What would a good solution be to prevent this? My...
  16. R

    Resultant force on pipe (Fluid Mechanics)

    Homework Statement Posted in picture below Homework Equations Bernoulli's Equation P/pg + v1^2/2g + z1 = P/pg + v2^2/pg + z2 The Attempt at a Solution Posted in picture below Wasn't sure if what I did was correct...still practising the topic itself
  17. V

    Balloon Pipe Expt: Reviews Needed for Thought Experiment

    Just made up a thought experiment. Looking for reviews. As follows: Assuming an "inflatable pipe" operating in vacuum to neglect ext. Influence, fluid flows through the pipe such that supports are only at the two rigid end connectors.The pipe will sag during operation due to fluid self weight...
  18. Sobak

    Boundary conditions for heat transfer in the pipe

    Consider the heat equation dT/dt - aΔT + v⋅∇T = S where S is a source term dependent of the radiation intensity I and the temperature T. The fluid velocity v is prescribed. We also consider the radiative transfer equation describing the radiative intensity I(x,ω,t) where ω is the ray direction...
  19. S

    Can a 300W fog machine create a smoke curtain 5 meters high?

    Hi guys, I'm a student and I'm new to this forum. Currently me and my friends are having a small project for the upcoming stage performance at school. We are trying to build a smoke curtain. The system will have a fog machine with 300W power and some PVC pipes that lead vertically to 5 meters in...
  20. W

    Lifting of submerged pipe, ventilation area calculation

    Hello all, This is the situation: a pipe, shown in de drawing below, is lifted at a constant speed of 1m/min. The pipe is closed at the top and open at the bottom. For obvious reasons, a ventilation hole is required at the top. The intention is to lift a minimum amount of water, in other words...
  21. B

    Charpy Test for the Longitudinal Weld Seam of Steel Pipe

    Hi all We are currently conducting Charpy V Notch Test to the Longitudinal Weld Seam of a Steel Pipe. The specimens we have tests are of two different size : full size (10mm x 10mm x 55mmL) and 2/3 size (6.7mm x 10mm x55mmL). We have conducted the tests severally time at -30degC. The results...
  22. K

    Change in gauge pressure using viscous flow through a pipe.

    Homework Statement Water flows at 0.25 L/s through a 9.0-m-long garden hose 2.0 cm in diameter that is lying flat on the ground. The temperature of the water is 20 ∘C. What is the gauge pressure of the water where it enters the hose? Side question: does the velocity of the water flow need to...
  23. B

    Why isn't concrete used more in the construction of high rise buildings?

    If you had a pipe with a ID of 125 mil and was over 500 meters long filled with 5m3 of concrete what would the pressure be at the bottom
  24. T

    Why Does Flow Rate Remain Constant When Reducing Orifice Size in a Water Tank?

    So we all know that due to the conservation of volume flow rate, reducing the diameter of a hose pipe would increase the velocity of the water flow.(A*V is conserved) But when the are of an orifice near the bottom of a water tank is reduced the velocity remains the same! Does anyone know why...
  25. A

    Homemade Electromagnetic Sledge Hammer: Build & Power Needs

    Hi, I would like to make a homemade electromagnetic device. It would be a 5cm diameter metal cylinder inside of a metal pipe. I would use electromagnetism to lift the (heavy) steel cylinder up the pipe, and then release it. It's meant to be used as a sledge hammer. Can I just wind a wire...
  26. B

    What equipment to measure force applied to ID of pipe?

    Hello PF. I'm currently tackling a problem at work that I could use some input on. I am trying to gather data regarding the force applied by a swelling material against the ID of a pipe. The purpose is to determine how the force increases with swell before leveling off, as well as to see how...
  27. T

    Water pressure drop when 1 pipe splits into 3

    Hi, what happens when I have a single pipe with pressure 1bar. I split this pipe into 3 equal pipes with equal diameter. What will be my pressure at the ends of these 3 equal pipes ? From what I have been reading on the internet it seems that the pressure will be the same on the 3 equal...
  28. G

    Rate of water cooling through copper pipe?

    So say I have a tank of water of about 2000mls which is at around 80 degrees celsius and is pumped around a copper system which is 3/8th inch thick pipe. how many meters would the water have to travel through copper pipe to return to ambient room temperature of about 20 degrees celsius. any help...
  29. C

    Solving Fluid Flow in Pipe: Mass Rate 4Kg/s, P1 700Pa, P2 600Pa

    1. I am trying to help my grandson with his homework and I have to determine the flow of a fluid in a pipe. I am told that mass flow rate is 4Kg/s; density p is 1012Kg/m3; Diameters D1 = 300mm, D2 = 400mm; Pressure P1 = 700Pa, P2 = 600Pa; Heights y1=0mm, y2=100mm 2. I have applied Bernoulli's...
  30. B

    Water Main Increase: 80mm to 150mm - Pressure Breaks?

    Was wondering whether a 2 kilometre section of 80mm asbestos water main was replaced with 150mm PVC then rejoined into the last 3 kilometres of old asbestos would it create pressure breaks. The head pressure is 50 metres. Cheers.
  31. can12345

    Pressure Loss in Transmission Line: Analyzing Reducing Union, Filter & L Pipe

    Homework Statement I would like to define pressure loses through transmission line to the transducer. In transmission line I have a reducing union, filter and L pipe. How I can find this differences? In case of frequency my reducing union reduce pipe diameter 6 mm to 3 mm how i can determine...
  32. j3dwards

    Fluid flow/pressure in a pipe going uphill

    Homework Statement Water is flowing along a pipe. Points B and C in the pipe are at the same height but point A is at a higher elevation.The pipe has the same cross-sectional area at points A and B but is wider at point C. Rank in order from largest to smallest, the pressures at the three...
  33. S

    What is the flow through pipe in an open channel?

    I know this is easy but i need to know the flow velocity through a pipe reducing in diameter inside a canal. the water velocity is 3m/s water depth is 1.5 m the pipe is at the bottom inlet diameter 0.9m small reduced diameter 0.6m outlet diameter = 0.8m note: this is an open canal with...
  34. T

    Pressure drop analysis on water pipe system w/pump

    Hey everyone. Four days ago I didn't know anything about fluids but I started my internship and got assigned a project that is all about fluids! And I need some help, this topic can get really complicated but I'm trying to take it one step at a time. Problem Description: There is a pump...
  35. M

    Heating water passing trough an 14mm SS pipe

    i have decided to heat pipe using wounding SWG 26 nichrome wire around the pipe,can anyone suggest me a good insulating bead which conducts heat well but is a good current insulator
  36. M

    Calculating Air Pipe Flow System Rates & Velocities

    I'm working in an engineering internship after my first year and we haven't covered fluid dynamics in my program yet. I've been assigned to find flow rates and velocities in several branches of a suction (dust collection) system in our factory. The main branch has a diameter of 30" and is...
  37. G

    How to Determine Weight Capacity of Carbon Steel Pipe Rack: Guide

    i have built a pipe rack made out of carbon steel and needing to know how to figure out how much weight it will carry. the longest horizontal piece is 4" sch 40 x 60 inches long welded to 8" sch 40 carbon steel. just trying to see if there is a chart of some sort
  38. J

    Density of a liquid in a horizontal pipe

    1) Alright, so the problem reads, "The liquid in a horizontal pipe of diameter d1 before a constriction is at pressure P1 and flowing with the speed v1, and then in the constriction with diameter d2 the gauge measures pressure P2. What is the density of the liquid?" 2) I'm assuming the...
  39. R

    Pipe wall thickness, barlow equation problem

    Hi guys I am working on some project that involves pipe wall thickness calculation, and I have one problem. here is the explanation of the example: http://pokit.org/get/?24c6e34b749030e74662402372ce5fc7.jpg Please, can some one tell me what means tf/m2 (ton force/square meter ?) and how to do...
  40. S

    Why will a pipe pulled around a curve rotate no torque

    Hello everyone, I am not a physicist nor do I know that much about physics. I do however have a physics question and this seemed like a great place to get an answer. I will present my situation the best I can. I work in the Horizontal Directional Drilling industry. This industry installs...
  41. D

    Pressure losses if going from a 1/2" pipe to 3/4" pipe?

    I am thinking of burying a 3/4" water line which is tied into my outdoor 1/2" house spigot line. This buried line would run about 100' to where I can better use it for washing a car or irrigating a flowerbed. My question is: by taking the new addition of water line from a 1/2" feed water line...
  42. B

    Time to drain water through a pipe

    Homework Statement A closed and elevated vertical cylindrical tank with diameter 2m contains water to a depth of 0.8m. A circular hole is made at the bottom of the tank with diameter 0.2m.As the water drains from the tank, compressed air above the water in the tank maintains a gauge pressure...
  43. S

    Gas confusion -- cooling air in a pipe using venturis and mixing

    Hello everyone! I am new here. I have used this forum on and off through google searches in the past and learned a fair bit from the posts. This is the first time asking anything. The question is probably extremely simple but has been overrun in my head for a week! It is in regards to...
  44. JP Beaulieu

    Venturi effect witout/with nozzle

    Hi, I am building a hose system with an automatic liquid dispenser using venturi effect. The 12v pump is taking water in a tank via a 3/4 pipe and has a capability of 2.9gpm at 50psi. The main system is built with 3/4 pipes and a 5/8 hose. The siphon pipe is 1/4 and I added a check valve...
  45. U

    Pressure drop per unit length of the pipe

    MODERATOR NOTE: THERE IS NO TEMPLATE BECAUSE THIS THREAD WAS ORIGINALLY MISPLACED IN A NON-HOMEWORK FORUM Viscous liquid (ρ = 1460 kg/m3, μ = 5.2×10−1Ns/m2) is pumped through a smooth pipe with a 0.1 m diameter, at a rate of 5×10−2m3/s. Using your Fanning friction factor versus Reynolds Number...
  46. S

    Light pipes - is there a limit

    I have seen light pipes which "conduct" sunlight from an outdoor receptor to the dark recesses of buildings ... but they all seem to be awkward bulky metallised tubes. Is it not possible to achieve the same effect with fibre optics? Could one not focus the light at the receptor into a...
  47. K

    Optimal Dragster Exhuast Pipe Angle

    Homework Statement Top-fuel dragsters can accelerate from rest at a rate of about 5g. If this does not sound impressive, consider that for most automobiles the friction between the ground and the tires produces the acceleration. Since the coefficient of friction between regular treaded tires...
  48. Suresh Gadekar

    Air Flow Rate in 1/4" Pipe at 1 Bar Pressure

    is it possible to have a flow rate of 10lit/sec in a 1/4" diameter pipe at 1 bar pressure ?
  49. A

    Friction and pressure drop in a steam pipe

    Hi I am new to fluid mechanics and I wondering if anyone can explain to me in very simple terms why friction causes pressure loss when steam is moving through a pipe? I thought the friction would slow down the fluid which will lead to higher pressure but it seems its the opposite. I was trying...
  50. A

    Heat transfer and surface area of a pipe

    So a friend of mine is living in an apartment with central heating but the radiators are removed, so there are just the pipes. He seems to think that if you cut aluminium jar caps and cover the pipes with them, it will increase the surface area of the pipe and therefore heat the room more. The...
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