A choice of patterns
According to its external patterns, corrugated metal pipes can be classified into three types: annular corrugated pipes, spiral corrugated pipes and spiral rib pipes. These patterns are considered important influence factors of hydraulic efficiency. For example, annular corrugated metal pipes feature parallel corrugations which may affect the flow of water even result in silt deposition if water carries sands and dirt. Spiral corrugated metal pipes are characterized by their spiral patterns for enhancing hydraulic efficiency. However, spiral rib pipes have smooth inner surface which allows liquid flow to pass through without any boundary turbulence. In addition, different patterns also affect assembly methods.
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