Revision 1
a.
Attendance - The system shall never be left unattended when pressurized.
b.
Multiple operation - When more than one (1) shotgunning operation is being
performed within the same area, a physical barrier shall be installed or adequate
spacing between operators shall be maintained
to
prevent the possibility
of
injury from
the high pressure water.
c.
Target holding - Objects
to
be cleaned shall never be held manually.
d.
Connection protection - The point where the hose connects to the gun shall be
shrouded by a protective device, (e.g., heavy duty hose, shoulder guard, etc.,) so as
to
prevent injury
to
operator should hose, pipe or fitting rupture.
e.
Minimum length- Where practicable, the minimum length
of
the shotgun lance
extension should be four (4) feet
(1.8
m)
from the triggering device
to
the nozzle.
f.
Hose protection - Steel braided hoses should be used on air operated fail safe systems
to keep the system from being activated by someone stepping on the hose or running
over it.
6.
Moleing
or
Flex lancing
a.
Control - The operator inserting the nozzle shall have direct control
of
the dump
system.
b.
Reversing - A positive method shall be used
to
prevent the nozzle from reversing
direction inside the item being cleaned, such as using a pipe nipple behind the nozzle
which has a length larger than the inside diameter
of
the item being cleaned. This pipe
nipple is known
as
a "stinger" (Figure 2-3).
TRAILER MOUNTED
TO
PREVENT LINE MOLE REVERSAL, ALWAYS USE A "STINGER"
(A PIPE NIPPLE WITH A LENGTH GREATER THAN THE INSIDE DIAMETER OF THE PIPE)
Figure
2-3.
Moleing
or
Flex
lancing
c.
Retrojets - During manual operations, the entrance to a line or pipe shall not be
cleaned with a nozzle containing back water jets without adequate shielding.
d.
Clearance - The clearance between the outside diameter of the hose, lance and nozzle
assembly and the inside wall of the item being cleaned shall be sufficient
to
allow
adequate washout
of
water and debris.
© Copyright January,
2001
NLB Corporation
2-23
To Next Page
Loading...