Revision 1
e.
Pressurization - During manual operation, the nozzle shall be inserted into the tube
prior to pressurizing. Conversely, the system shall be de-pressurized before removal of
the nozzle from the tube.
f.
End identification - Hoses shall be conspicuously marked no closer than 24" (0.6
m)
from the nozzle
to
warn the operator
of
the nozzle location.
g.
Nozzle support - Where the length
of
the nozzle and rigid coupling is less than the
inside diameter
of
the pipe, a length
of
rigid pipe (i.e., stinger) not less than the
diameter
of
the pipe being cleaned should be fitted directly behind the nozzle or a
suitable safety shield should be provided
to
protect the operator. This is to prevent the
nozzle turning around
180 degrees and doubling back towards the operator.
7. Rigid lancing
a.
Control - The operator inserting the nozzle shall have direct control
of
the dump
system.
b.
Clearance - The clearance between the outside diameter
of
the lance and nozzle and
the inside wall
of
the item being cleaned shall be sufficient
to
allow adequate washout
of
water and debris.
c.
Pressurization - When under manual operation, the nozzle shall be inserted into the
tube prior
to
pressurizing. Conversely, the system shall be de-pressurized before
removal
of
the nozzle from the tube, unless proper shielding is provided.
d.
Shields - When lancing tubes with a rigid lance, a guard should be installed, where
practicable, around the lance,
to
prevent a lance nozzle from being inadvertently
withdrawn and causing injury.
8.
Additives
a.
Additives - Any water additive (e.g., chemical, detergent or solid particle) shall be
used in accordance with the manufacturer's recommendations.
9.
Proper operation
a.
Start up - The high pressure water jetting unit shall not be started and brought
up
to
pressure unless each team member is in his designated position, the nozzle is held in, or
directed at, the work piece and the lance/gun securely held.
b.
Adjustments - Apart from operational procedures, no attempt shall be made
to
adjust
any nut, hose connection, fitting, etc., while the system is under pressure. The high
pressure water jetting unit shall be stopped and any pressure in the line discharged prior
to making any such adjustments.
Caution:
Care should be taken to release the pressure in the dry shut
off
gun
and
the
line when the unit is switched off.
© Copyright January,
2001
NLB Corporation
2-24
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