Underground pipelines
32.15.1.
Adequate ventilation should be provided for workers
in pipelines.
32.15.2. When laying pipes in water-bearing
ground, a flood
gate should be provided at the end section.
32.15.3.
When high-pressure pumps are used:
they should be tested before they begin to work;
the pressure gauge should be kept under observation;
and
the maximum safe working pressure should not be
exceeded.