Temporary Bypass Water
Temporary Bypass Water
(OP)
I am currently working on a project where we are replacing an existing water system in a neighborhood. Most of the area is residential but there are some commercial and industrial buildings. The area is being divided into phases to minimize the duration where temporary water is being provided. I'm trying to find out if there is a guide on sizing the temporary pipe. The locality that this work is being done for doesn't have any guides for temporary water bypass. Any suggestion would be very much appreciated.





RE: Temporary Bypass Water
Having said that and not knowing the size of your system, the minimum size of water main for modern water distributions systems is 8-Inch. The 8-Inch water main will handle the typical residential fire flow requirement.
RE: Temporary Bypass Water
Instead the new mains were installed for the area (sometimes a complete community) connected to the distribution system, and tested. This meant that at some point there were two live distribution systems. The only shutoffs were done at the point of connections and for a short time period.
Once the new system is hot and bacteria free, service connections can be transferred over. After all the service taps and connections are made, the old main was cut off. This usually involved an isolated or short time shutoff as well.
Note that you will probably find some service taps that you didn't know about so they need to be ready to make additional taps once the old mains are abandoned.
RE: Temporary Bypass Water
I am under the impression that using an 8-inch line for temporary is not what is typically done. I've mostly seen 2 and 4-inch lines for temporary.
Seems odd that there is no guideline. I know that standard pipe flow and pressure designs are not applicable to temp lines but there must be some minimum.
RE: Temporary Bypass Water