3.26. Underground piping systems
This part covers the minimum requirements for the design of underground piping in oil, gas, and petrochemical plants.
The design pressure and temperature of underground piping should be determined in accordance with ASME B 31.3.
3.26.1. Underground piping drawings
The following items should be shown in underground piping drawings:
1. All buried sewers
2. Underground process and water lines
3. Equipments and structures foundations
4. Cables trenches for electricity and instruments
5. Coordinates of roads, buildings, storage tanks, and pipe racks
6. Natural elevation
3.26.2. Underground piping layout design
The minimum clear space between underground piping and sewer lines is 300 mm, except for cooling water lines where heat ...
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