I have a question regarding the startup procedure for two small Roots blowers, one in use and one as a backup
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For aeration in wastewater treatment, two Roots blowers are used, one in operation and the other as a backup, with a power capacity of around 3 kW each. I want to automatically control two fans to operate in turn, but the manufacturer says it is not recommended to start the fans under load. Do I need to add an automatically controlled vent valve? Or rather, using a \"unloading valve\" (but I couldn’t find one suitable). I hope experienced experts can offer their suggestions! Thank you so much!
Or in other words, can it be started directly when switching?
A delayed startup method can be considered: after the currently in use unit stops (after a set period of time), the backup unit starts up. The pressure is basically relieved.
But there is still water pressure at this time (the water depth is 3m); I’m not sure if I’m right……
Setting the startup interval to 30 seconds will do; that way, there will be no pressure
I’m sorry, I still don’t understand… I think there will still be load at the time of startup; it is a start-up under load. The fan manufacturer recommends using an automatic unloading valve
Then install one according to the manufacturer’s requirements; since the fans have already been purchased, it doesn’t matter if there’s one less valve
Increase the pressure by 29.4 kPa; if check valves are installed at the outlets of each fan, it is possible to start the units under load
Increase the pressure by 29.4 kPa, provided that each fan pipeline is equipped with a check valve. It can be started
If the fan’s outlet pipe is protected by a check valve, it can be started directly