TO BE EXACT I am looking for a globe valve, or ported piston valve, or axial flow (needle) valve, or an eccentric plug valve - i.e. something with good controllability - not a gate valve or a butterfly valve !!!
Some air valve models have a built in isolation valve, like a plug valve in the base of the bowl. This is inplace of a separate gate valve or butterly valve fitted betwee the pipe T and the air valve.
Such integral isolation valve would possibly permit the valve bonnet to be open for inspection...
Does anyone know a good CAD system which produce a pipeline longitudinal profile drawing with the tabulated ground level, depth, invert level, pipe size, slope etc running along the bottom of the long section ? We need a program which can automatically update these parameters whenever the GL or...
For a radial pump (specific speed in the region of 25) the closed valve head can be estimated as TDH x 1.25.
You could obtain a group of pump curves from a supplier of similar pump models and extract a typical pump curve shape -above and below TDH.
If you really want to go into it, a whole...
There are many small package stations on the market with pumps and all equipment built into a plastic tank lining - Try ABS.
Check the static lift and pipeline friction for the full range of sump levels - the supplier can do this for you.
In UK the regulations require minimum velocity 0.75 m/s...
The HPPE suggestions are a good idea. But if you are limited to uPVC - yes it does come as 16 bar (232psi) or sometimes 20 bar (290 psi) In Europe these are to DIN8061/2 or BS1452. Contact www.ips-plastics.com.
The programs which produce the best grpahical output are the most expensive ones, normally used on a large scale by water companies as a means of managing and maintaining their networks.
To make a comparison you would need to get a demo version. A very good one is Wallingford's InfoWorks (see...
There are many ways to pick up clues as indicated by the above useful responses. The final sure way of knowing if there is a significant leak is to compare inflow vs outflow meter readings. The best way to then find the precise leak location is by sounding techniques (if not already located...
Thanks. Yes I do have the exact wavespeed formula using Youngs modulus and thickness of pipewall and bulk modulus of water and can calculate the exact wavespeed in any homogeneous or composite material. BUT I am interested to know how pre-stressing tension affects it. Are there any surge experts...
How do you calculate the wavespeed for surge analysis in a pre-stressed concrete pipe ? Is it affected by the stress in the pre-stressing wires ? (I know the thickness of concrete, thickness of steel cylinder and size and pitch of wires including the tension.)
This is a huge area- difficult to answer in a few lines.
Are you planning a long term, on-going leakage detection policy over a wide area - if so leakage management with water metering and zoning will be needed to identify the worst areas for leakage - before localised leak detection.
If you...
Hydrae is right BUT the question was "are there any standards" - none that I am aware of - nothing in BS 8010 but BS 8005 - sewerage systems:pumping mains(from memory) mentions economic pumping velocity guide line limit of 2.5 m/s.
As long as you can accomodate the resulting headlosses...
In a gravity network there can be many isolation (buttefly/gate) valves which may need to be closed in emergency/maintenance situation (e.g. burst pipe event) As a surge analysis expert my normal advice is DONT close these valves against the flow - shut the system down first. Of course in a...
