Choose the Best Pipeline for Your Application
When water quality changes, we’ve seen aluminum, galvanized steel, weathering steel, and even stainless pipe corrode. PolySpan is completely resistant to these changes and protects the significant investment you’re making in an irrigation machine.
Other so-called corrosion resistant pipelines are sensitive to a number of corrosive elements commonly found in irrigation water. More importantly, some combinations of these elements will result in accelerated corrosion rates.
Weathering steel is only slightly more corrosion resistant in irrigation applications than plain carbon steel. It is sensitive to humid subtropical climates where the protective patina may never stabilize, so it continues to corrode. Painting reduces the corrosion resistance of weathering steel, as well. Even the smallest defect in the paint is an opportunity for corrosion failure.
Stainless steel is sensitive to levels of chlorides above 40 ppm and sulfates greater than 100 ppm. It is also sensitive to highly basic or acidic water (pH greater than 11 or less than 4). It is not recommended for soft water and can be incompatible with certain farm chemicals, such as soil remediation products.
Aluminum is sensitive to levels of chlorides and sulfates above 50 ppm, pH greater than 8.2 or less than 5.0, crop production chemicals containing high levels of sulfur or copper, fertigation products such as phosphoric acid, and soil remediation products using sulfuric acid.