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Hello, I am currently doing some scoping work to identify potential storage sites for a reservoir capable of holding 500,000m3 of water. The terrain in the area has a fairly consistent fall, however there are some humps and hollows around. I am trying to optimize the reservoir geometry to...

Or should I be using the manning equation: Q = (1.486/n)*A*(R^2/3)*S^0.5 Where: Q = flow in cfs A = Area in sq ft R = hydraulic radius in feet ( for a circular pipe R = D/4 ) S= slope of the hydraulic gradeline in feet/foot For a standard galve pipe what would be the...

Hi, This is a relatively simple one I believe, but I have not had to do it before. I am trying to work out what the velocity will be through a 150mm pipe which is 45m long and has an RL difference of 5m from top to bottom. The pipe is pressumed full with 100mm of head above the top of the pipe...

Thanks for your help, Using 137800kPa = 137.8N/mm2 I got a wall thickness of 7.7mm.

I used the online calculator here: http://www.pipingengineer.com/online/pipewallcalc.html

The table you have pointed out gives an allowable stress of 9722kPa for Sch 80 steel (300mm). When I enter this value into the formula I get a wall thickness of 73.8mm! The values I have used are: Pipe O.D (mm.) 300 Internal Design Pressure (barg) 52.53 Stress Value for Mat'l from Table A-1...

Hello, We have recently had a pipeline checked for wear and I wan't to determine what the maximum amount of wear (or reduction in wall thickness) before the pipe must be replaced. We are using ASTM A53B 12" Sch 80 steel pipe with a wall thickness of 12.7mm. The maximum pipe pressure seen in...

Hi David, Thanks very much for your reply. Other than the collapse pipe my other concern was that there would be a siphoning effect and the suction on the down hill would cause the water to be pulled through the pump (causing overspeeding) damaging the pump or sucking the tank pump dry. I...

Hi, We are currently in process of designing a new pipeline. We wish to pump to a height of 56m (over a hill) and then the pipeline will go down the other side approximately 131m. Therefore the line will be under vacuum and I am worried the line will compress inward (as it is HDPE pipe). Is...

Thanks everyone for this very useful information. Problem solved.

Can you explain how you got 2720psi? seems very high for a line component pressure drop even at this high flow rate.

there is not a length of 1" pipe it is simply a nozzle (1inch in diamter) on the end of the 6inch pipe. This device is used for cutting rock. I am working out all the pressure losses through the pipe (i.e valves etc.) and would like to know how much pressure loss will result from the reduction...

Should have been more clear. the 6inch line has a 1" nozzle on the end. I am interested to find out how much backpressure or restriction the nozzle has. And yes I do mean 4.5m3/min.

Hi, I am trying to determine the pressure drop across a pipe reduction, from 6" pipe to 1" pipe. The volumetric flow rate is 4.5m3/min. Is there a k value for a reduction of this size? or is there an equivalent length for a reduction in pipe of this magnitude? I would like to see how the...

Hi, I am looking for a reference/information of temperatures of various types of metal on metal sparks. I need to know roughly what the temperature of a spark is which is generated during contact of diffent metals. If anyone can help with this that would be great. Thanks in advance.

Great thanks, I will try these and see what sort of results I get. I have found another correlation in the wolverine handbook which can be used to calculate the heat transfer coeffiecient on the air side without the need for working out a hydraulic diameter. Makes things a bit easier but I...

I have noticed in the finned tube heat exchanger part of this reference there are some errors in his working so be careful when using it. Made things a bit confusing until I figured out what he had done wrong. (used incorrect value for viscosity)

Hi vpl, Thank you very much for your reply. This link was exactly what I was after, and has proved very useful. Thanks for taking the time to show me this.

Hi, I am trying to determine the hydraulic diameter of a finned tube but I am unsure how work this out. I have attached a diagram showing the tubes and dimensions. The distance between the ends of the fins is 0.5mm. If someone could help with this simple problem that would be great.

Hi, I am trying to find some good online sources for designing finned tube heat exchangers. The best source I have so far is "Compact Heat Exchangers, W.M.Kays and A.L.London", which is very good however it is quite a brief text. There seems to be very few examples for designing this type...