Revision 1
H.
Procedures
1.
Work
area - Where practical, work pieces
to
be jetted should be removed from plant
areas
to
a high pressure water jetting area. Where this is impractical, cutting or
cleaning in place, or adjacent to the installed position, can be done with the necessary
clearance and permission
of
the occupier.
a.
Area
limits - Area limits applicable to the cutting or cleaning operations shall be
defined and the team shall mark these limits by barriers and notices
to
warn against
access to other personnel. Suitable barriers shall be an approved form
of
hazard
warning, rope or tape, as a minimum. Alternatively, a suitable barrier shield is
acceptable at any reasonable distance. Notices should state the following (or in other
suitable wording):
"DANGER
KEEP CLEAR,
HIGH PRESSURE WATER JETTING
IN
OPERATION"
b.
Corrosive materials - Where there is a possibility
of
encountering corrosive or toxic
materials, the occupier shall be requested to inform the person in charge
of
high
pressure water jetting
of
any precautions that may be necessary, including the
collection and disposal
of
waste materials.
c.
Work
surface - Operators should have good access to the work piece, a safe working
platform and secure footing. The area in which work is
to
proceed shall be kept clear
of
loose items and debris
to
prevent tripping and slipping hazards.
d.
Access - Access by unauthorized persons into the area where high pressure water
jetting is taking place shall be prevented. The area shall be cordoned off and warning
notices displayed in prominent positions. The perimeter should be outside the effective
range
of
the water jet wherever possible.
e.
Approaching the operator - The occupier shall be requested
to
inform all personnel
likely to require access to the area that high pressure water jetting is in progress.
Personnel having reason
to
enter the water jetting area should wait until the water jet is
stopped and his presence is made known. Personnel wishing to have the jet stopped
shall approach a team member other than the lance/gun operator. The lance/gun
operator shall not be distracted until the water jet has been stopped.
f.
Side protection - Target and side shields shall, where feasible, be suitably placed to
safeguard personnel and equipment against contact with grit or solids removed by
water jets.
g.
Protective equipment - All personnel working or entering the barricaded area while
cleaning or cutting is in progress shall wear the required protective equipment.
2.
Pressurizing the system - Pressure shall be increased slowly on the system while
being inspected for leaks and/or faulty components. All leaks or faulty components
shall be repaired or replaced. System shall be de-pressurized for repairs.
© Copyright January,
2001
NLB Corporation
2-21
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