Revision 1
3.
Team operations - In most water jetting operations, it is accepted practice to employ a
minimum
of
two (2) persons.
a.
Supervision - All high pressure water jetting operations shall be controlled by a
supervisor who is trained in all aspects
of
the high pressure water jetting operation.
b.
Number
of
operators - The operation
of
the high pressure water jetting equipment
should be by two (2) or more operators according to the equipment being used and the
nature
of
the job. These operators shall work as a team with one (1) member in charge.
The operator
of
the gun
or
lance (as defined below) shall take the lead role while
jetting is in progress.
c.
Lance/Gun operator - One (1) operator from the team shall hold the lance/gun or
delivery hose with the nozzle mounted on it. His primary duty is to direct the water jet.
d.
Second operator - The second operator
of
the team shall attend the high water jetting
unit, keep close watch on the first operator for signs
of
difficulty or fatigue and watch
the surrounding area for intrusion by other persons or unsafe situations.
If
required, he
will shut
off
the pressure until it is safe to continue. Caution should be exercised in
shutting
off
the pressure rapidly as this can cause the loss
of
footing by the lance/gun
operator.
e.
Additional operators - Further operators are required in the following circumstances:
• To assist the first operator with the handling
of
the lance
if
it is too long
or
too heavy
for one (1) man.
•
To
provide communication
if
the lance operator is out
of
sight
of
the high pressure
water jetting unit operator.
f.
Job rotation - The team members should rotate their duties during any
job
to
minimize fatigue to the operator holding the lance/gun.
g.
Team leader - The team leader is responsible for basic equipment checks (as detailed
below), the preparation
of
the working area for safe operation and for obtaining a
permit to work where and when required.
h.
Code
of
signals - Before starting a high pressure water jetting operation, the team
members (one [1]
of
whom must be in charge) shall agree on a code
of
signals to be
used during the operation
of
the equipment.
1.
Fitness - The operator and other team members shall be physically and mentally
capable
of
performing the required operations.
4.
Single person operation - Single person operation is allowed where the pressure does
not exceed
2,000 psi (137.9 bar) and the flow is less than 20 gpm (5.2 !pm).
a.
Single operator guidelines - All other recommendations pertaining
to
team operations
shall hold.
5.
Shotgunning
© Copyright January,
2001
NLB Corporation
2-22
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