In addition there are limitations to the pressure rating of ductile iron fittings in various codes. No matter what the catalogues state.
ôThe beautiful thing about learning is that no one can take it away from you.ö
---B.B. King
http://waterhammer.hopout.com.au/
Hi Shorion,
Thanks for the offer. I have excluded this requirement from my scope and have recommended that the end user do some physical testing. If I get meaning full results I will be in contact. The non linear behaviour of the PE makes for interesting modelling.
Hi Littleinch,
To the...
LittleInch,
the reason the flange cannot be rated to PN16 using a flange drilled to ASME B16.5 or AS 2129 or some other standards is that the flange is design for a steel pipe. The PE stub end results in a larger bore for the backing ring, the PE does not behave linearly when stressed, and the...
AFt Fathom for steady state and Impulse for transient analysis. www.aft.com
I am based in Australia and have used these products for >20years. Graeme Ashford at Accutech in Perth is the agent. great back up support.
ôThe beautiful thing about learning is that no one can take it away from you.ö...
Traditionally piping in PE and other thermoplastics uses a stub end with a steel backing flange. The backing flanges are drilled to a standard to match valves, instruments and equipment.
There appears to be no calculation method to determine the design rating of such an assembly in any code I...
What AFT product? Fathom for steady state & slurries or Impulse for transient analysis? Perhaps Arrow for gas pipelines?
Speak to Graeme Ashford at Accutech in Perth Australia. He markets both FluidFlow 3 and AFT products. I presume steady state as FluidFlow 3 does not have transient analysis...
Re top entry being the standard method. I have no idea but it seems logical. There must be a textbook somewhere that refers to it. Also very difficult to maintain if the pipe was to block on bottom entry.
ôThe beautiful thing about learning is that no one can take it away from you.ö
---B.B...
Australian standard AS 2566 provides the guidance for design and construction of flexible pipelines. Iowa State University and Books by Watkins also cover the subject.
The thing needed to give consideration to are not only deflection but strain, stress, combined loading and buckling. Being a...
If the sludge forms a crust on top because the liquefied material is going in and out of the bottom the silo may be exposed to 15 bar pressure? Can it withstand the pressure.
Four decades ago there was an accident in a margarine factory in the UK that killed a worker. The heating coil went into...
Why not consider a two stage closing butterfly valve? After all they are most likely to cause water hammer in any system. At 90% closed the flow is almost full flow. Hence you only have to close the last ~10 degrees to simulate a fast closing valve.
Alternatively you could use an explosive...
Have you considered the transient pressures on pump trip? You selection of pipe/hose may be compromised by higher than you think transient pressures.
ôThe beautiful thing about learning is that no one can take it away from you.ö
---B.B. King
http://waterhammer.hopout.com.au/
http://www.pumpsystemsmatter.org/ for pump application training.
Download their free learning tool http://www.pumpsystemsmatter.org/content_detail.aspx?id=110 which is a cut down version of AFTs Fathom. Model you system and compare system curve to pump curves.
ôThe beautiful thing about...
http://www.infrastructurecost.com/Estimating_Software gives tutorial and free use licence for a trial.
ôThe beautiful thing about learning is that no one can take it away from you.ö
---B.B. King
http://waterhammer.hopout.com.au/
Perry's Chemical Engineering Handbook had some guides to estimating. From memory there were formulas for updating previous years estimates.
Working as a cost planner I always had to get prices from suppliers to get some accuracy into an estimate. If you can give an undertaking to the supplier...
I have experienced this in a nozzle check valve. After exhaustive field testing we took the valve apart and the springs had disintegrated. After replacing the springs the system was fine. It was a bad batch of springs that had not been tempered correctly.
Sometimes looking too hard for an...
