Materials and Installation of Delivery Pipes for Irrigation Systems

Material for the irrigation system in the selection of the main consideration is the material is subjected to mechanical stress, extreme temperatures, solar radiation, as well as its ability to chemical exposure may suffer. Mechanical stress may be due to internal conditions, such as water pressure, water acidity and alkalinity, water hammer and vacuum. Member may be made of an external force such as a ground load, thermal expansion and contraction, mechanical impact against the component. There can be a variety of combinations of metal, composites, plastics, ceramics, and elastomeric components for irrigation systems of. Not only should the material be able to withstand the mechanical and environmental stresses may occur, but they should be to each other to prevent internal corrosion or galvanic effect compatible. In the main consideration is the component selection pressure levels, wide temperature range, chemical affinity, and cost.

Polyvinyl chloride (PVC) pipe is under development in the chemical synthesis of the substrate and the results are computer-controlled manufacturing. It is extruded into a continuous seamless length with strong, chemical resistant, low friction losses, and is light weight, easy to operate. Type and grade refers to the ability to design stress pressure hydraulic tube. Type I, I class, is the most common micro-irrigation systems. There are two types I and II and Class I and II available.

Pressure ratings may be given in the head, class, or PSI level, schedule, or SDR (standard dimension ratio) feet. PVC pipe may be designated as low-head (pressure), which is rated as the head (22 psi) or less than 50 feet tall, its nominal head of more than 50 feet category refers to a pressure rating in pounds per square inch ( Table 1). SDR outer tube diameter and wall thickness (Table 1) ratio. Use the working pressure, including surges, may not exceed class competitions. It represents the same schedule with the same nominal diameter and wall thickness dimensions (see Table 2) iron pipe or plastic pipe. There is a difference between type I and II and Class I and II pressure rating. This information should be stamped on the pipe. When using PVC, because as the temperature rises, the safe operation of pressure reduction (Table 3) Temperature is also important.