Page 62 - kursus eBook
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DRAFT GUIDELINE ON DOMESTIC GAS PIPING SYSTEM
Underground gas piping
150 mm
300 mm Other buried facilities
Parallel layout distance Cross layout distance
Clearance from electrical cable and lightning arrestor should be as per table below:
Buried Facility Clearance (mm)
Low voltage cable > 100
High voltage cable > 1000
Lightning arrestor > 1500
Drain Crossing
Drain crossing gas pipe should be installed under the drain as shown in the following figure:
Ground level
at least Channel/Drain at least
300 mm 300 mm
at least 300 mm
Gas pipe Gas pipe
Typical Drain Crossing
Connection of plastic piping (polyethylene piping)
When plastic piping (polyethylene pipe) is used as underground piping, connection between
metallic pipe (steel) and polyethylene pipe shall be made only outside, underground and
with approved transition fittings.
Isolation Joint Installation
Isolation joint shall be installed in the following location:
o Location where pipes or fittings made of different materials are joined in buried portion.
o Transition portion between underground and aboveground piping.
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