Is pigging water lines really necessary?

Cities and municipalities typically do not require regular pigging of lines in water systems. Some may only require pigging after initial construction of a new line to remove any debris left in the line because flushing alone will not always clean the dirt and debris out of the line. 

There are several reasons municipalities consider pigging of their potable water line systems: 

1. Distribution lines tend to have a biofilm that coats the inside of the pipe. The bacteria in the biofilm are dormant until certain conditions activate them, thus causing problems. Regular flushing alone does not eliminate this biofilm. Only regularly scheduled pigging, along with flushing will reduce or eliminate biofilms. 
2. Inadequate water flow is also a common reason. More flow (volume) of water may be needed to support development or a growing population using the water system or to provide adequate water for fire fighting. In areas of water systems where increased development has caused water demand to surpass the flow output of an existing line, sometimes the existing waterline system may need to be rebuilt with a larger line capable of supporting the increased demand. However, pigging may be the solution if the existing flow is restricted due to excessive deposits.
3. Optimal fire fighting capabilities are a significant concern. Many cities require a minimum sized diameter waterline when connecting a fire hydrant to provide adequate flow for that area . After years of service, however, the inside of the pipe can become restricted with deposits making the fire hydrant less effective if not useless for its intended job. If fire flow is needed, in the past the solution has been to replace the whole waterline, which can be very costly and time consuming. Pigging may restore adequate flow for fighting fires at a fraction of the time and cost.
   
   
4. In addition, pigging waterlines can lessen complaints from water customers regarding the very same deposits that may have restricted fire flow. These deposits are unwanted foreign matter such as iron oxide (red water), alum, calcium carbonates, barium sulfide and sediment. Pigging can, in many cases, provide a solution. As an added benefit and cost factor to communities, cleaning these deposits may also reduce pumping pressures in areas that have booster pump stations. Increased pumping pressures can result in line leaks and pipe failures causing significant cost factors and extended downtime to customers.

Above are just a few reasons a waterline may benefit from or need pigging service. If you are experiencing difficulties or suspect your pipes need service, you are advised not to undertake line pigging on your own. Shop around and find a reputable company, such as Professional Piping Services, Inc.. with over 30 years of experience in line pigging with water lines. Contact them today to discuss your specific needs or concerns.