POWER May 2010 - 45
Plant Safety
■ Were the local emergency services or fire
department involved in the planning? Is
fire fighting equipment centrally located
for workers?
■ Has the gas piping design been reviewed
for mechanical issues, including piping
materials, rated valves and fittings, purge
points, and blinds? Where are the isolation
points, and how will isolation be
safely achieved?
■ Is there a natural gas isolation and equipment
lockout plan? Is there a plan for cleaning
lines and re-testing automatic valves
after the project has restarted? Verify that
all special shutoff valves are serviced. Verify
that all piping is properly marked.
■ Is the gas utility involved in the purge process
(or should it be)? Do they have any
special requirements?
■ Have you determined the amount of nitrogen
needed for the purges and leak
checks and how it will be introduced to
the piping system? Does everyone understand
nitrogen hazards? Conduct safety
training on the use of nitrogen as part of
the planning process.
■ Where will the purge be directed? What are
the prevailing winds? Are there building
vents or other equipment air inlets nearby?
If a high-pressure pipeline blowdown or
pressure release is to occur, modeling of
the plume may be helpful (Figure 4).
■ Are all electrical services secured in the
area of the gas purge and where the venting
of natural gas may occur? An explosion
can only occur when an ignition
source is nearby.
■ The portion of the project site where gas
purges take place should be cleared of all
4. Vent safely. This is a typical piping vent.
Unfortunately, it points straight down in an attempt
to keep rain water from entering the pipe.
Releasing a high-pressure line through vent configuration
can create a ground level flammable
cloud. Courtesy: CEC Combustion Safety Inc.
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circle 33 on reader service card
May 2010 | POWER
www.powermag.com
45
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POWER May 2010
Table of Contents for the Digital Edition of POWER May 2010
Contents
POWER May 2010 - Cover1
POWER May 2010 - Cover2
POWER May 2010 - Contents
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