Page 60 - kursus eBook

DRAFT GUIDELINE ON DOMESTIC GAS PIPING SYSTEM

PIPE PENETRATING THROUGH SOLID WALL
OR FLOOR

Non-Metallic Pipe Sleeve

Bare Copper Pipe
Gas
Brick/ R.C. Wall

FIG. 5 PIPE PENETRATING THROUGH SOLID WALL OR FLOOR
Underground pipe damage protection

Proper protective measures should be taken to protect underground gas piping against
damage caused by the third party work. In addition, when underground gas piping is
installed in soft soil, proper measures should be taken against differential settlements.

Underground gas piping installation before the boundary line of private land should have a
depth of cover not less than 900 mm.

Underground gas piping installation beyond the boundary line of private land should have a
depth of cover not less than 450 mm or deeper whichever is required by authority. The
cover should be permitted to be reduced to a minimum of 300 mm if external damage to the
pipe is not likely to result.

Pipe casing or protection slab should be used where the depth of cover of underground gas
piping is not sufficient to protect the pipe from damage.

For steel underground gas piping installation, a cathodic protection will be used in
conjunction with the coating to protect the gas pipe against corrosion.

Warning marker should be installed at suitable intervals along the straight and curved runs,
and whenever there is abrupt change in direction of the underground gas piping as required
by the regulations.

Warning slab should be located above the entire length of the underground gas piping. The
purpose of warning marker and slab is to show that underground gas piping has been
installed.

300
Warning Tape

150

Gas pipe
Copper Gas
Sand
450

FIG. 8 PIPING BURIED IN GROUND OR UNDER CONCRETE
EXTERNAL OF BUILDING

20