Questions tagged [pipelines]

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Does a venturi cause strain on a pump

Excuse my terminology if it's wrong. I'd like to know if a venturi causes strain on a pump. For example, in my drawing. I have an air pump behind the house with a 50mm pipe fitting. On the other side ...
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Pressure variation through reduction (Bernoulli) and pipe wall design

Let's say I have a pipe followed by a reduction and then another smaller diameter pipe continues. Using conservation of mass, the flow through the smaller diameter pipe will have higher velocity. If I ...
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82 views

Head loss coefficient for a valve with respect to both the open position and flow rate

This question talks about the head loss coefficient for a valve, i.e., $K_{L}$ for $h_{L} = K_{L} V^{2} / 2g$ where $h_{L}$ is head loss. First, head loss coefficient for a valve with respect to the ...
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2 answers
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How to determine the "complete turbulence" boundary line in a Moody diagram?

Most Moody friction factor diagrams (like this one) show a dashed line frequently labelled as either "Complete turbulence", "Wholly turbulent flow" or "Turbulent flow", ...
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1 answer
61 views

Water dynamics in aluminum pipeline for dummies

This topic is totally alien to me, so I may be asking something very obvious. I am designing a cooling system. In the bulk of aluminum, I drill 3mm holes and then I connect them one to another to ...
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1 answer
189 views

Pipe network analysis: static pressure of a closed-loop pipe

I've learned fluid dynamics but does not have much knowledge about its real-world applications. My question is about the static pressure of a closed-loop pipe. [Fig. 1. Pipe network. Source: ...
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2 answers
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Question on fluid flow measurement uncertainty

Say you are trying to measure the liquid flow rate (mass or volume) through a pipe and you want to get the best measurement possible, and you have two flow meters. In one scenario, you put one flow ...
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136 views

Assessing flow rate from open sea into a container

I'm currently assessing sub sea pumped hydro capabilities, and need to use the flow rate in order to calculate power output. I can calculate the energy storage capacity using E = mgh: $E=mgh = ...
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2 answers
91 views

Pumps' geometric similarity

Given two pumps that are similar : $H_1=70-1.41x10^{-3}Q_1^2$ $H_2=100-1.1x10^{-3}Q_2^2$ Find the geometric scale : $\frac{D1}{D2}= ?$ I am also given maximum efficiency = 1. I tried solving but I got ...
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Why is the head loss in submerged pipe is 0

Looking at this question : Point C head loss is 0 according to the author Bottom right Can’t understand why , any good explanation for this claim ? Look at page 33 at the top
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1 answer
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Calculate mass flow rate of saturated fluid through pipe

Its very basic question. But there is no data all over internet about it. Let's see how we calculate mass flow rate through pipe. We take velocity of fluid and c/s area of pipe. Then we find volume ...
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220 views

How do you determine flow distribution at a dividing T-Junction?

So I've been trying to find out how to determine what proportion of fluid will flow down a given path when a main line branches into two lines at a 90 degree T-Junction and I can't find anything ...
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2 answers
271 views

Shearing Stress at the Boundaries of two infinite Planes

This is a worked example on a book I am reading (Fundamentals of fluid Mechanics). He then asks "Can you explain the change in sign? [Hint: Sketch a sheared fluid particle adjacent to the top ...
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Calculate fan power

I was wondering how to calculate the required fan power for the following air pipe network. Other losses besides friction is not calculated for. Known parameters: Fan provided flow, VA = 3000 m3/h ...
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-1 votes
1 answer
268 views

Head loss for T junction diverging water pipes

I am writing to ask for help with a T-junction pipe problem. Attached picture shows the pipe configuration. The schematic shows a large pipe with ID 16.5mm and smaller 4mm ID tubes connected to it. ...
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-1 votes
1 answer
658 views

Pipe Invert Elevation

Can someone please help and explain if the invert elevation of the pipe is calculated as 192+2+10? or 192+2+10+0.6667 (8" pipe)? Or 192+2+10+1 (measured to bottom)? Sketch is not to scale.
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7 votes
4 answers
2k views

Why is the friction factor in laminar flow independent of pipe roughness?

The Darcy friction factor is defined as: $$f_D =\frac{64}{Re}$$ with $Re$ I mean Reynolds number (global). I was wondering why Darcy in laminaire flow is independent of pipe roughness (wall roughness)?...
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-1 votes
2 answers
39 views

How to design internal wall separation in the PVC tube to use it as a water tanker

I am working on design of the column which contains the water tanker and the pump + electronics at the bottom. I have tried different solutions and they failed. I would like to know your advice on ...
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2 votes
1 answer
284 views

Determining required pressure drop for choked flow conditions to be met

I have pipework system with an inlet pressure, $P_0$, which passes from a pipeline of fixed diameter, $D_0$, through a tee with reducer to a smaller diameter pipe, $D_1$, before returning to another ...
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4 votes
2 answers
83 views

Divide Flow and Maintain Pressure

Im in the process of building an espresso machine from readily available parts. I have a solenoid pump that supplies pressurized hot water to the coffee grounds. I want to be able to tune the pressure ...
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1 answer
109 views

Airsoft BB Funnel Design - Electric funnel jam solution?

I'm working on a design to feed Airsoft BB's through a funnel. A simple gravity fed system (ie. I don't want to force them out at speed) but every now and again the BB's get jammed at the end of the ...
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2 votes
3 answers
251 views

How do you determine how many pumps you need in a pipeline?

I am working on a pipeline design scenario and I am trying to determine how many pumps I need. In addition to this diagram, I'm given a flow rate range and an acceptable velocity to also determine the ...
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1 vote
1 answer
27 views

Linear pneumatic actuator opening time - pressurise connection pipe

I would like to estimate the time needed to open a linear single-acting pneumatic actuator. The actuator's piston is loaded with a spring pushing downwards and the operating fluid (air or nitrogen) ...
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2 votes
1 answer
51 views

Heat Loss through a run of insulated piping

I've been racking my head around calculating the amount of heat loss still water will experience through a run of insulated piping. The water in the tank is maintained at roughly 550°F saturated, and ...
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1 answer
3k views

Calculating the flow rate of a siphon system

What i am looking for: I am looking for a formular to calculate the water output in $l/s$. My goal is to match a pump (pumping the water back up) with the following setup, to keep it going with as ...
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59 views

Finding Horizontal and Vertical Force on Bending Pipe

I did a Civil Engineering course some years ago and from my textbook I had a question on a bending pipe. The purpose of this question is to see if the way that I have calculated this is correct, as ...
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1 vote
2 answers
732 views

Find Torque and Force on Pipe with Bend

I did a Civil Engineering course some years ago and from my textbook I had a question on a pipe with a bend. Now I think I have the part of the question on force correct, but I am not sure how the ...
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2 answers
131 views

Straight Pipe Thread

Is there any National Pipe Thread Straight (non-tapered, requires O-ring or compression olive) that is compatible, even loosely, with a machine thread threaded rod? I want to put a reducer on the end ...
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1 vote
0 answers
113 views

Trying to simulate the bending of a right angled pipe in solidworks

I have created a bent right angled tube in solid works. It has a constant inner diameter of 1" and thickness of 1/8". The tube is comprised of a straight portion 1 ft in length, followed by a 90 deg ...
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1 answer
175 views

Determining the headloss according to Darcy-Weisbach with pipes in parallel and series

Given the following situation: Pipe A and B have a known and identical length and diameter, and are in parallel. I'm assuming the flow trough pipes A and B are also identical, as is the roughness of ...
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77 views

Ideas on optimization of DRA and energy consumption of a pipeline

I have a 200 mile pipeline with a few pump stations in between. I am trying to find ways to optimize the electricity and DRA consumption, and was wondering if anyone has ever done something similar ...
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1 vote
1 answer
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Volumetric flow in a pipe from velocity

I think I'm missing something important here. For a fluid with a velocity $u$ in a pipe with cross section area $S$, the volumetric flow rate is equal to: $$Q_v = uS$$ If we now consider vectors, ...
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2 votes
1 answer
107 views

Connect heated copper tube in PVC tube

I have a copper tube that I'm heating (quite a lot) with a torch, I have to connect a PVC pipe in the entrance of the copper and one in the exit (so water can flow through the copper pipe). The only ...
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3 votes
1 answer
497 views

Negative head in Darcy's flow equation

This question appeared in my midterms. A pipe transports water from a storage tank A to storage tank B. Storage tank A is at an elevation of 20 m above B, the pipe length is 6.4 km. The present ...
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4 votes
3 answers
92 views

How to make sure a pipe does not take all of the water from a stream?

I am trying to design a pipe which takes water from a river and transports it to a reservoir. However, I do not want my pipe to take all of the water from stream, because that will create all sorts ...
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1 vote
0 answers
171 views

Determining the Steady Discharge Between Two Reservoirs

A uniform pipeline, $5km$ in length, $100mm$ in diameter and with a roughness size of $0.03mm$, conveys water between two reservoirs. The difference in water level between the reservoirs is $...
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1 answer
45 views

How to create an algorithms for fitting a network of tubes into a cube? [closed]

How to create an algorithms for fitting a network of tubes with a range of diameters into a cube, with maximum volume in the tubes? Assume: 30 cm minimum square side 1 cm minimum pipe diameter 1 mm ...
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1 vote
1 answer
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Simple way to duct a PVC pipe through a stainless steel sheet cover

I need to duct a PVC pipe (DN80) through a stainless steel sheet metal covering. The hole thing needs to be tight against stormwater. There's tons of products to duct pipes through thick walls, but I'...
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How to maintain a static negative pressure in a valve?

My target is to create a valve with multiple inlet capillaries. And my output is a pipe of a larger diameter. I do not want to use any electrical systems, and at the same time, I want to maintain ...
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1 vote
1 answer
67 views

Do nylon and rubber bushes usually come in sizes between steel pipe sizes?

I'm in Cambodia where I don't speak the lingo and I'm hoping to do a little DIY project. If I were to buy two different off the shelf steel tubes am I right in thinking that the most common nylon and ...
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4 votes
0 answers
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Simplifying head loss across a piping network

I am tasked with designing a compressed air piping network,with and would like to determine the pressure loss across the different layers of instruments -now here is the 3D layout of the network. ...
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2 votes
1 answer
899 views

What are the differences between compressor stations, pump stations, and booster stations?

I am doing some research on impacts related to natural gas compressor stations. In some states, I've received data for compressor stations alongside other facilities in the oil and gas world. These ...
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0 answers
378 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?
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1 vote
1 answer
613 views

Elevation / pipeline Elevation calculation

We do inspections using a robotic camera in the pipeline. It’s tractor type camera. (Ref. photo) While driving the camera through the pipeline it gives us the camera tilt degree output. The camera ...
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2 votes
2 answers
816 views

What is a reference that i can use to find the interpretation of a symbol in a gas line schematic?

I have a schematic for some gas lines in a wafer processing unit. One of the symbols which occurs is a circle with an x in it that has the left and right quarters filled in to form two black ...
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0 answers
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Alternative to HDPE Piping for long range sea-water + water transport [closed]

Is there an alternative for the expensive HDPE Piping for long range sea water transport?
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4 answers
77 views

Software options for simulating oil flow in small diameter pipes [closed]

I'm looking for 1D software packages that can simulate flows of oil (lubricant) in pipes of a small diameter (typically between 1mm to 12mm in diameter) and have found around 10+ possible candidates, ...
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1 vote
1 answer
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Intuition behind pressure losses in pipes

From standard pipe-loss equations we know that features in piping systems, such as wall surface roughness, or valves along the pipe system, cause major and minor pressure losses respectively. However, ...
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0 votes
1 answer
240 views

Equivalent Lengths of Pipe for Laminar Flows

I have a pipe network with laminar flow (peak output from the pump gives a Reynolds number around 1100). I have some test data for the network and the results are really odd to me; I cannot explain ...
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4 votes
1 answer
4k views

Losses through holes drilled in a pipe

I asked a previous question about pipe t-junctions with pipes of varying diameters, and it got me wondering... How are losses handled and calculated in pipes with holes drilled directly into them? ...
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