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. Y

    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...
  2. B

    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!
  3. Jehannum

    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...
  4. S

    How does valve size affect water heater pressure loss?

    There are 2 kinds of home instant bathroom water heater. The multipoint and single point (or shower heater). The latter is one where the unit is connected directly to the shower head. In the multipoint, its located a distant away and it serves multi points like sink and bath. What would happen...
  5. Amir Sedieqy

    Removing an inside weld line in a pipe

    What is the best and fastest way to remove the inside weld line of pipes with 16mm outside diameter and 1m thickness so a piston can reciprocate easily inside it? I have two options in mind. one is to have the inside of LSAW pipes machined, which might be laborious. The other option is to cold...
  6. A

    Flow rate of a pipe - calculation

    So, I actually do not know, if the formula given applies to this problem or not, so I wanted to check
  7. E

    Understanding Stress in Pipe Walls: Impact of Internal Air Pressure

    Consider a pipe. The pipe is not crushed by the air pressure because the same air pressure is acting from inside the pipe. But this means that the material of the pipe is being compressed on both sides by some air pressure. So is it correct to say that the through-thickness stress in the pipe...
  8. S

    Pipe Friction, Reynolds number & Bernoilli's Equation

    First calc reynolds no. Re Flow = 1.5ms-2 Re = (density x mean velocity x diameter) / viscosity = (1007 kgm-3)(1.5ms-1)(0.1m) / 0.002 Pa s = 75,525 = Turbulent flow I used this chart Here And I am getting friction factor of 0.02 Would you agree with this?
  9. A

    Pipe Design to pump sea water from the ocean to a boiler via intermediate tanks

    I am in the process of designing a pumping/piping system for fun, have no experience in this field, but I enjoy learning. I have been using ANSI/ASME codes in the project quite a bit. For the system I am using 4" nom. Schedule 40 316 SS pipe. The reason I selected the pipe is because the...
  10. T

    Understanding forces acting on a pipe bend when fluid is passing through

    Hello all I am trying to understand the forces that are acting on a pipe bend when a fluid is passing through it. I have been given the following diagram:- The bit i cannot get my head around is why does P2A2 point the way it does i.e. down towards the left shouldn't is point the opposite...
  11. B

    Pressure loss pipe system: Conversion from known fluid1 to fluid2

    Hello, everyone, I am currently working on the following (real) problem, where I am not getting anywhere. It would be super nice if you could have a look at this. Thank you very much :-). I have a pipe system (Black Box) of which I only know the following things: At a set flow rate with a...
  12. saxman2u

    Volumetric flow from vessel through pipe to another vessel

    Hi, I am trying to calculate how much water can flow with just gravity from water tank A to water tank B. Each tank as a 2" orifice on the side wall at the bottom. If water tank A is 100% full and water tank B is completely empty, if someone opens a 2" ball valve at the bottom of tank A, how...
  13. B

    Second highest frequency in a sound pipe

    So here is my question Have tried it and got these as my answers Have I done part b) correctly over here to find the 2nd highest frequency? Any help would be much appreciated! Thanks
  14. B

    Open pipe end correction distance for waves

    Struggling on how to do this Q I have tried drawing a sketch of it and had come up with this This is probably not right, as the speed of sound is not given here as well the length of the open pipe tube? Any help would be really great! Thanks
  15. Anon_Miner

    Volumetric flow rate of a pipe

    Hello kind people of PF I am looking to mount a fan on one end of a pipe but I'm not sure how much air can the pipe transfer. (Volumetric flow rate) The pipe is vertical and 15 meters long.It has a diameter of 10 cm. I'm looking to push air from top to bottom using a fan. Need to know the...
  16. T

    Velocity equation for a cyclindrical tank and long pipe

    I was not really sure as to whether to ask this question here or the h/w forum as its something I am personally trying to understand. However, I shall let the admin decided. The question comes from a book called : . The specific question I have an issue with is not the question itself but the...
  17. brotherbobby

    Gauge pressure of water oozing out of a pipe

    Assuming water to flow out of the pipe with the same speed as inside and the thickness of water column ##h_{ab} = h_{cd} = h##, my answer would be ##\mathbf{(P_b = P_c) > (P_a = P_d)}##. My reasoning is as follows : at positions ##a\; \text{and}\; d## the gauge pressure is 0 and the total...
  18. S

    Steam Flow through holes in a pipe

    What will be mass flow rate of dry saturated steam through holes on a pipe. Pipe ID: 25mm, Steam Pressure 3 kg/cm^2, Holes' Dia: 3mm, Number of Holes: 5.
  19. E

    B Hydraulic resistor as a constriction in a pipe

    Earlier I was trying to explain to one of my siblings why current is constant in a series connection (invoking that if it weren't we would have an accumulation of charge, etc.), however to give a more intuitive picture I tried to describe the hydraulic model of electric circuits, representing a...
  20. T

    Impact of Atmospheric Pressure on the Water in a Tank and a Pipe

    Hello all I was hoping someone could help with understanding how fluids level out under atmospheric pressure. For example:- Below is a picture of a tank of water with a closed door at the bottom, the door leads to an inclined pipe that is closed off at the end there is another pipe connected...
  21. hogwildwa

    Understanding a subsurface pipe failure

    The situation is that we have 4.5 inch diameter pipe with a 300,000 lbf yield rating installed in a horizontal completion. The pipe is cemented in place but it is very likely that the one side of the pipe may not have any cement in it. During the fracturing operation, a sleeve is opened and...
  22. maistral

    2D advection-dispersion velocity component for fluid flow in a pipe

    Pardon if the answers to my questions are obvious, because as usual I am trying to decipher everything on my own (as the material has not been taught to us quite well; then again it's graduate school). I just need someone to reassure me that I am understanding this correctly. Say for example I...
  23. M

    Does water flowing through a pipe make noise?

    I've my small incursion team entering a 10 foot diameter water outlet pipe using electric sleds for propulsion and was wondering about sensors in the pipe detecting them. They're wearing suits that mask their IR, but what about noise? The pipe flow is 3.18086e+07 l/h with a 1.25 m/s current...
  24. D

    Help with this formula for the Thermal Expansion of a pipe please

    I do not understand how this formula is derived: Can somebody help me? Source: https://www.corzan.com/en-us/piping-systems/specification/thermal-expansion
  25. maistral

    Heat Transfer Coefficient in Large Pipe w/Smaller Pipes

    Hello, I have a question with regard to equipment design. How do I calculate the overall heat transfer coefficient for a large pipe who has smaller pipes in it? Say I have water flowing on the large pipe, and inside it there are three pipes with hot acid in them. Assuming they flow concurrently...
  26. JosephStevens99

    How do I Calculate the Spring Constant of a Piece of PVC pipe?

    Okay so, recently I got a job with my local newspaper delivering newspapers to make some money while deciding how I want to continue my educational career (I already have some college under my belt but I'm taking a semester off). All the newspapers have to be at the houses by 6 am so in order to...
  27. W

    Can I readily clamp a pipe with 450 weight without it slipping?

    I'm planning on lifting a submersed well pump that is hanging on a 80' 2" galvanized pipe. Total weight is estimated to be 447lbs based on: pump ~ 50lbs pipe 3.6lbs per foot water 1.36lbs per foot The plan is to use two pieces of wood (1 foot of 2x6) with two clamps to hold the pipe in place...
  28. S

    Pressure of Slurry in a Stainless Steel Pipe

    I am trying to find the pressure in a ANSI stainless steel pipe with a nominal diameter of 10 in. A slurry of fiberglass and water is flowing through the pipe that has a viscosity of 3.2 centipoise. The flow rate through the pipe is approximately 3000 GPM. How can I figure out the pressure in...
  29. A

    How to calculate a pressure drop in a branch of a loop ring pipe

    Good day I'm trying to calculate the pressure drop in each branch of the following loop ring system I used the following formula to find the pressure drop but i seems that it worked only for the ring, and the branch #2 ( the branch in the middle), the solution given by the professor show...
  30. C

    Converting PSI Pressure Loss in a Pipe to Fluid Loss Rate

    Summary: Pipe Testing I need some help on how to calculate PSI loss to gallons per hour? We will be testing this 8" PVC line at 150 PSI for 4 hours. If the test gauge drops 10 PSI per hour, what is the formula to determine the gallons per hour lost? Thank you for your help.
  31. M

    Engineering Help with pressure drop/transposing formula to get pipe diameter

    Hello. My attempt at the solution is as follows: l = 160m Q= 300 ls-1 R= p2/p1= 6+1.01/1.01 = 6.94 (2dp) d = Unknown Pressure drop = 0.3 Bar 0.3 = 800*160*300^2/6.94*d^5.31 0.3 = 1.152x10^10/6.94*d^5.31 0.3 ( 6.94*d^5.31) = 1.152x10^10 6.94*d^5.31 = 1.152x10^10/0.3 d^5.31 =...
  32. M

    The direction of the tangential force (Fully developed laminar flow in a pipe)

  33. M

    What is the relationship between pipe diameter and frictional loss?

  34. S

    Huge pressure drop after changing pipe length (Don't think it's loss)

    Hi All, Recently, I have been struggling to seek a solution for a seemingly simple flow question and try to rationalize my thoughts with mechanical engineering knowledge I have acquired from school but none of them can make me feel comfortable about answering the phenomenon I encountered in...
  35. D

    Venturi pipe in engine exhaust flow

    I would appreciate opinions on this...on which setup would create the best vacuum in an exhaust gas stream? The #1 drawing is a pipe that has a birds eye cut in it. These are sold for engine crankcase exhaust ventilation. There are some that say they work, then others that say they don't work...
  36. dustball23

    Calculating bending stress on a pipe

    In both designs, a PVC pipe is being bent 90 degrees, fixed at each end. In both designs, the pipe is fixed at both ends. In both designs, the pipe is 1" (inner diameter) Schedule 40 PVC pipe, 450 PSI. Material code PVC 1120. NSF pw-G ASTM D1785 PPFA 02199101H6BX 0934. In design A, the length of...
  37. K

    Converting Pipe Displacement into forces on a Bend

    Hi there, I am by no means a mathematician, I am currently working on a project to improve the safety of gas distribution systems in multi occupancy developments. I am hitting a bit of a wall regarding converting displacement onto force. I am trying to calculate the stress applied to a point...
  38. M

    Fluid Mechanics problem: Oil pressure calculations in pipe flow

    Problem Statement: An oil with density 900 kg/m3 and viscosity 0.18 Ns/m2 flows through a circular pipe which inclines upwards at 40° to the horizontal. The length of the pipe is 10 m and the diameter is 6 cm. The fluid pressure at the lower end of the pipe is 350 kPa and the pressure at the...
  39. HumanistEngineer

    A Solving the Convection-Diffusion Equation for this Pipe with a Heat Sink

    Hi Again, I try to solve the transient temperature propagation through a buried insulated pipe by means of solving the convection-diffusion equation with a heat sink that is the heat loss from the water mass to the ground. Below you can see the details of my calculation steps in my numerical...
  40. HumanistEngineer

    Mutual Thermal Resistances between Pipe Layers

    Ref: Palsson, Halldor | Analysis of Numerical Methods for Simulating Temperature Dynamics in District Heating Pipes - please check pg. 62 at LINK (CLICK!) INTRO: In this reference, the mutual thermal resistances between layers as water-insulation, ground-surrounding, and insulation-ground are...
  41. L

    I Optimal Copper Pipe Size for Misting System

    I am attaching a standard 5/8" garden hose with approximately 70psi pressure to a copper pipe that is capped on the opposite end with mist nozzles mounted periodically along its length. I want the pressure at each mister to be as similar as possible. The hose attaches at the base, a solid line...
  42. J

    Water pressure question involving pipe, flexible hose and a filter

    Summary: water pressure issues what happens when you take water from a 3/4 inch pipe copper to 1/2 inch flexible braided hose through a filter for a 3/4 pipe back through a flexible braided hose 1/2 inch tube to 3/4 inch copper pipe?
  43. T

    Calculating Drag Through A Pipe

    MODERATOR NOTE: NO TEMPLATE - MISPLACED HOMEWORK Hi All I was hoping someone could help with the following problem:- Concrete is being pumped along a pipe. All of the concrete that is more then 10cm from the wall of the pipe is moving at 0.2m/s, and the material in contact with the pipe wall...
  44. Clout

    Fluid mechanics - pump in a horizontal pipe connecting two pipes

    So when the velocity of v1 and v2 is 0 (because the tanks are much bigger), the bernoulli equation to dh is dh = (dp-dpl)/(rho*g) with dp = Phyd / V = 1000W / 0.01m³/s = 10^5 Pa and rho = 1000 kg/m³ So I am getting first without the pressure loss on the orifice dh = 10^5 Pa / (1000 kg/m³ *...
  45. S

    Pressure loss in a water pipe

    I know that water losses pressure as it move throw a pipe due to friction. Does that mean that if we have two elevated tanks separated by a great distance but connected throw a perfectly horizontal pipe ,and then we fill the first tank with water till it reaches a certain hight, then the hight...
  46. M

    How to calculate pressure for gas pipe?

    Hello all, Thank you for reading my topic. My client asked me to make calculation sheet for gas pipeline like the image below. Can someone help me to make this? (i'm new in this system, need to learn and study. So please help me) How to calculate the required pressure at connection point if...
  47. C

    How can we reduce the pressure in a pipe?

    Hello We have a pipe that receives water at a constant rate. This creates pressure in the pipe. Is there a way to reduce pressure downstream? Which equations describe the factors that affect pressure? Thanks!
  48. W

    HVAC Understanding the movement of a fluid in a vertical pipe

    The actual problem I am trying to understand is the suction requirement to move #2 home heating fuel from the outdoor tank to the pump of the burner located in my cellar. But first i just want to understand the movement of fluid in a vertical pipe without worrying about viscosity or...
  49. P

    Pressure changes of a fluid flowing through a horizontal pipe

    If we have a tube of fluid going like it is shown in the picture, and we measure pressure at two points we would get the same value. But the fluid is still going from point A to point B. So is pressure difference not necessary for fluid flow or I made some other wrong assumptions?
  50. rumborak

    Fluid going through pipe: what is the influence of speed on exchanging heat?

    I'm doing a fun home project, and it involves water flowing through a metal pipe, where the surrounding is significantly lower temperature than the water in the pipe. The point of the exercise is to cool the water in the pipe as it flows through it. The question is, what influence does flow...
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