Data related to directly buried steam pipes

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Minimum clear distances between directly buried steam pipes and other underground pipelines and facilities
Name Minimum horizontal clear distance (m) Minimum vertical cross-clearance distance (m)
Water supply pipes 1.5 0.20
Sewer pipes 1.5 0.15
Gas pipes – Pressure ≤ 400 kPa 1.0 0.20 – Pressure ≤ 800 kPa 1.5 0.20 – Pressure > 800 kPa 2.0 0.20
Compressed air and carbon dioxide pipes 1.0 0.15
Edges of drainage ditches 1.5 0.50
Acetylene and oxygen pipes 1.5 0.40
Subways 5.0 0.80
Foundations of electrical railway contact poles 3.0
Bottoms of road and railway slopes 1.0
Railway track surface 1.20
Road surface 0.70
Pipes for flammable or combustible liquids 1.5 0.30
Cables and communication cable conduits 1.0 0.60
Electricity – Voltage ≤ 35 kV 2.0 0.80 – Voltage ≤ 110 kV 2.0 1.20

Minimum horizontal clear distance between directly buried steam pipes and buildings and structures
Name Minimum horizontal clear distance (m)
Edges of building foundations 3.0
Outer edge of railway rails 3.0
Edges of railway or road ditches or separate stormwater drains 1.0
Edges of foundations of overhead pipe racks 1.5
Foundations of bridge supports (elevated bridges, piers) 2.0
Edges of enclosure walls 1.0
Centers of lighting and communication poles 1.0
Edges of irrigation ditches 2.0
Centers of trees or shrubs 3.0
Foundations of overhead power lines and poles – 1 kV 1.0 – Above 35 kV 2.0 – 110–220 kV 3.0 – 330–500 kV 3.0

Minimum depth of burial for directly buried steam pipes
Nominal diameter (mm) 50–200 250–450 500–800
Metallic outer sheath – Under carriageways (m) 0.70 0.90 1.00 – Under non-carriageway areas (m) 0.50 0.60 0.70
Non-metallic outer sheath – Under carriageways (m) 1.00 1.10 1.20 – Under non-carriageway areas (m) 0.70 0.80 1.00

Diameter of vent pipes
Diameter of main pipe Diameter of vent pipe
DN ≤ 200 32
DN = 200–400 40
DN > 400 50

Diameter of collection tanks
Diameter of main pipe Diameter of collection tank
DN ≤ 200 Same as diameter of working pipe 200