By Harry Von Huben
Nice water distribution operator ebook!
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Other Cleaning Methods Badly encrusted mains ma y also be cleaned using metal scr apers consisting of a series of units having high-carbon spring-steel blades. The sections ar e free to rotate, and the unit is pushed through the main by water pressure acting against pusher cones. If deposits in a main ar e particularly thick or dense, mechanical cleaning w ith a power drive is usually required. The work is generally done by a special contracting fi m using a unit similar t o a sewer rodding machine to pull a cutter through the main.
This is usually c onsidered poor design because fl w to many locations is through only one pipeline. Flow near the end of a long “branch” may be r elatively poor. This design is poor also because a r elatively large number of customers may be without water while repairs are made at a point near the c onnection of the branch to the transmission main. Customers at the ends of long br anches may complain of poor water quality. This is caused b y poor circulation of water in the system. Unfortunately, few dist ribution systems are completely laid out in an ideal pattern.
2003. : American Water Works Association. bk Page 21 Wednesday, July 6, 2005 2:01 PM Chapter 3 Distribution System Operation and Maintenance The operation and maint enance of a wat er distribution system requires many varied duties and skills. The piping syst em must be car efully operated to keep an adequate supply of water available for all c onsumer uses, while maintaining ut most diligence to protect public health. Distribution System Inspection As a municipality expands, the demands on the syst em change.