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Municipal water pipelines
Water supply Firefighting water pipelines
pipelines
Industrial water pipelines
Agricultural irrigation water pipelines
Effluent pipelines
Drainage
Rainfall pipelines
pipelines
Effluent/rainfall interflow pipelines
Coal gas pipelines
Gas
Natural gas pipelines
pipelines
Liquefied petroleum gas pipelines
Heat Hot water pipelines
pipelines
Underground Steam pipelines
pipelines
Electricity Power cable
pipelines
Lighting cable
Telecommunication cable
Telecom
Radio and television cable
pipelines
Special communication cable
Petroleum pipelines
Industry
Chemical industry pipelines
pipelines
Deslagging pipelines
Other
pipelines
Figure 2 – Functional classification of underground pipelines
[source: CJJ 61‐2003, b‐26]
ITU‐T's Technical Reports and Specifications 391
