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...
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.)
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...
