Question: Storm pump Emergency power from a second source

[smoradm]

A pump is proposed for storm water detention. The specs calls for a Duplex, 4" force main, 363 GPM, 6' TDH. The motor size is 020-2.0 HP and Power Characteristics is43 - 460V/3PH/60Hz.

The reviewing agency has provided the following comments:
Comment 1: A back up pump is required in event of pump failure.
My Question: The pump is already a Duplex pump. Isn't this considered a back up pump?

Comment 2: Provide emergency power from a second source or install a quick connect for mobile generator.
My question: I am not designing the electric panel or connection. Will a NOTE on the pump detail drawing such as: " Contractor to provide an emergency power from a second source or install a quick connect for a mobile generator." acceptable or usually done by civil engineer.

Thanks

 

[dicksewerrat]

You have find out what types of emergency generators the owner has and if any is capable of supplying enough power to the pump station to run the pump. If they don't, they will have to get one. You may have to do part of the design of the pump control panel in order to have in it the proper power connections and the ability to switch the panel from power company to emergency generator power. The pump will have to have an extra option on it and that will be the emergency power cord to go from a plug on the generator to the control panel. The last thing you will have tell the owner is that the reviewing agency requires them to run this pump in case of power failure and not use the generator to run the office reefer and coffee pot.

Richard A. Cornelius, P.E.

http://WWW.amlinereast.com

 

[civilman72]

I agree that a Duplex system includes a backup pump. I also agree that a civil engineer normally would not design the electrical system, but I think your general note is way too vague. Without identifying where the second power source is coming from and how to correctly install it (i.e. may need a transfer switch), you could end up with all different kinds of bids. You also need to define what kind of generator the district is using. For example, is it anticipated that the district will have a generator with the capability to run 3-phase power?

 

[dicksewerrat]

I know you need a transfer swith because the control panel will still have to control the pumps. And you want to isolate the panel from the power grid while the gnerator is running the pump station.

Richard A. Cornelius, P.E.

http://WWW.amlinereast.com

 

[chicopee]

A second source implies a second independent source of power to the duplex pump.