Table 3 Relative weights of factors influencing corrosion causes of water pipes.
From: Analysis and ranking of corrosion causes for water pipelines: a critical review
Categories | Causes of water pipe failure | Relative weights | Category-relative weights | |
|---|---|---|---|---|
Environmental | Soil factors | Moisture | 0.022 | 0.337 |
Temperature | 0.017 | |||
Chemicals | 0.024 | |||
Soil quality | 0.049 | |||
Soil type | 0.024 | |||
Microbial activities | 0.022 | |||
Backfilling | 0.014 | |||
External factors | External loads | 0.042 | ||
Climatic conditions | 0.026 | |||
Stray current | Electrical infrastructure | 0.057 | ||
Improper CP design | 0.020 | |||
Defects and insulation failures | 0.020 | |||
Pipe-related | Dissimilar metals | 0.037 | 0.235 | |
Material | 0.047 | |||
Age | 0.044 | |||
Manufacturing defects | 0.027 | |||
Diameter | 0.020 | |||
Internal protection problems | 0.030 | |||
External protection problems | 0.030 | |||
Operational | Physical factors | Water pressure | 0.074 | 0.428 |
Water hammer | 0.025 | |||
Leak/burst | 0.020 | |||
Human errors | 0.016 | |||
Bio-electro-chemical factors | Water quality | 0.150 | ||
Water type | 0.021 | |||
Conductivity | 0.023 | |||
Bacteria/microorganisms | 0.099 | |||
