Revision 1
C.
Definition of Terms
1.
High pressure
water
jet
systems - High pressure water jet systems are water delivery
systems which have nozzles or other openings whose function is to increase the speed
of
liquids. Solid particles or additional chemicals may also be introduced, but the exit
in all cases will be a free stream.
In terms
of
these recommended practices, the "system" shall include the pumps
(pressure producing devices) and the hoses, lances, nozzles, valves, and safety devices,
as well as any heating elements or injection systems attached thereto.
2.
High pressure
water
cleaning - The use
of
high pressure water, with or without the
addition
of
other liquids or solid particles, to remove unwanted matter from various
surfaces where the pressure of the liquid jet at the orifice exceeds
1,000 psi (69 bar).
Caution:
The lower limit
of
1000
psi
(69 bar) does
not
mean that pressures
below
1000
psi
(69 bar) cannot cause injury
or
require
any
less
attention
to
the principles
of
these recommended practices.
Adequate precautions, similar
to
those
of
these recommended
practices, are required
at
all pressures.
3.
High pressure
water
cutting - The use
of
high pressure water, with or without the
addition
of
other liquids or solid particles, to penetrate into the surface
of
a material for
the purpose
of
cutting that material, and where the pressure
of
the liquid jet exceeds
1,000 psi (69 bar).
4. Lancing -
An
application whereby a lance and nozzle combination is inserted into and
retracted from the interior
of
a pipe or tubular product.
5.
Dump system -
An
operator controlled, manually operated device or system that
rapidly reduces the pressure
to
a level that yields a pressure flow at the nozzle that is
considerably below the risk threshold.
6.
Moleing - Moleing is an application whereby a hose, fitted either with a nozzle or with
a nozzle attached to a lance, is inserted into and retracted from the interior
of
a tubular
product.
It
is a system commonly intended for cleaning the internal surfaces
of
pipes
or drains.
It
can be self-propelled by its backward directed jets, and is manufactured in various
shapes, sizes and combinations
of
forward and backward directed jets.
7.
Nozzle - A device with one (1) or more openings where the fluid discharges from the
system. The nozzle restricts the area
of
flow
of
the liquid, accelerating the water
to
the
required velocity and shaping
it
to the required flow pattern and distribution for a
particular application. Combinations
of
forward and backward nozzles are often used
to balance the thrust. Such nozzles are commonly referred to
as
tips, jets, orifices, etc.
© Copyright January,
2001
NLB Corporation
2-13
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