Licensed and Certified
Neuse Plumbing is licensed by the City of Durham and is an approved certified tester in Durham, Raleigh, Cary, etc. Accordingly, in addition to the cities and towns listed, we can certify and install backflow devices in all of the Greater Triangle area, including all towns and cities in which the Raleigh, Durham or Cary is the official water purveyor. Some of these cities and towns include Wake Forest, Rolesville, Knightdale, Zebulon, Wendell, Morrisville, Apex, Holly Springs, etc.
Most manufacturers recommend performing a major rebuild at least every three to five years. This means replacing all rubbers and springs. For some models, the rebuild kits are quite expensive and not all are carried by local distributors or retailers. For 1 inch and ¾ inch devices, consider replacing them if the brass is pitted or shows corrosion or if the device has been previously rebuilt.
Replacing an existing backflow device is a very straightforward process, that usually only requires a simple repipe. We usually replace all of the fittings and nipples from the union to the backflow device.
Backflow generally occurs when incoming supply pressure falls below that pressure which exists in the distribution system. This negative pressure differential condition then causes a reversal in the normal flow of potable water, commonly referred to as backflow.
Backflow is further classified as either back-pressure or back-siphonage. The latter being defined as a fall in incoming supply pressure that results in system pressure being less than atmospheric pressure. Essentially, a vacuum or negative pressure is created.
The City of Raleigh is primarily concerned with the reversal of water flow beyond the meter, regardless of the cause. Thus, on dedicated meters, backflow devices are usually installed within five(5) feet of the meter being protected and before any tees or branching takes place. If there is a single meter that supplies both domestic and irrigation demands, then the backflow device is placed immediately downstream of the tee on the irrigation or branch side. This reduces the possibility of a cross connection between potable and non-potable water systems. For homeowners falling under the City of Raleigh’s jurisdiction an RP (reduced pressure principle zone) backflow device is required.
Also, if a residence has both well and city water, then an RP backflow device is required. There are other scenarios requiring a backflow device, but the details are too much to state here. Some require a containment device, while others require an isolation device.