Page 59 - kursus eBook

DRAFT GUIDELINE ON DOMESTIC GAS PIPING SYSTEM

Piping buried in concrete or soil

Provided the wall thickness is adequate, pipework may be placed in a chase. A chase is a
recess which is made after the wall has been constructed. A chase must be made vertically
or horizontally, never diagonally.

Underground pipes also need to be protected against aboveground loading by using
protective sleeves and slabs. When dissimilar metal are joined underground, an insulating
coupling or fitting shall be used. Piping shall not be laid in contact with cinders.

PIPING EMBEDDED IN CONCRETE FLOOR

R.C. Slab
Reinforcement Bars
Copper Pipe
Gas
MIN. 40 mm

FIG. 7 PIPING EMBEDDED IN CONCRETE FLOOR

Uncoated threaded or socket welded joints shall not be installed in contact with soil where
internal or external crevice corrosion may occur.
Piping which is in contact with soil or other materials which may corrode the piping shall be
protected against corrosion in an approved manner.

Pipe penetrating through solid wall or floor

Gas pipes passing through solid walls or floors must take the shortest practicable route and
be enclosed in a gas tight sleeve.

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