Piping Construction Procedures
PIPE SIZING AND INSTALLATION
Gravity flow waste piping usually falls into two categories. The smaller diameter (6–8") should be used for primarily liquid wastes, such as swine manure and dairy milkhouse waste. The larger diameter pipes (20–36") is usually used for beef and dairy waste that includes manure and bedding.
The Midwest Plan Service recommends that 8" diameter pipes and smaller be laid at a minimum of 1% slope. This equates to 1' of fall every 100'. For larger diameter pipes a minimum slope of ½% is recommended, or 6" of fall every 100'. The pipelines should be installed as deep as possible (preferably below the frost line), but should have at least 2' of cover above them for equipment traffic. Cleanouts are recommended at every 200' and at all bends. Pipes laid through the pond embankment should have a seepage collar attached to prevent leakage.
WASTE PUMPING FACILITIES
Several different types of pumps can be used to transfer livestock wastes. Since pump type selection is very specific to the on farm situation, the U of I, NRCS or ISDA should be consulted when planning a pumping system. Several dairy waste systems are in operation in Idaho which use a concrete vault for waste collection with a sump pump to transfer the waste to a storage pond (see Figure 13).
Figure 13. Typical Pump Tank Diagram