Revision 1
8.
Operator
- A person who has been trained and has demonstrated the knowledge and
experience to perform the assigned task.
9.
Operator
trainee
- A person not qualified due to the lack
of
knowledge and/or
experience to perform the assigned task without supervision.
10.
Shotgunning
- An application whereby a lance and nozzle combination can be
manipulated in virtually all planes
of
operation.
11.
Hose Assembly - A hose with coupling attached in accordance with manufacturer's
specifications.
12.
Lance
- A rigid metal tube used to extend the nozzle from the end of the hose.
D.
Equipment Definition and Standards
1.
Pressurizing high
pressure
pump
- A unit designed to deliver high pressure water or
other fluid. This is usually based on positive displacement pistons or rubber
diaphragm/hydraulic systems, and discharges water into a common manifold to which
either flexible hoses, or rigid tubing, connecting
to
lances and nozzles are attached.
These high pressure pumps can be either mobile or permanently mounted.
The pump should have a permanently mounted tag or tags providing the following
information:
• Product and supplier
• Production model and serial number or year
of
production
• Maximum performance in terms of flow- measured
in
gpm (lpm), and pressure-
measured in psi
(bar)
• An outline of recommended safety procedures
2.
Relief system - The system shall be equipped with an automatic relief device on the
discharge side
of
the high pressure pump.
3.
Automatic
pressure
relief devices - These may take the form of:
a.
Pressure
relief valve (by-pass valve)
or
bursting
disc
(rupture
disc)
in
holder
-
Usually mounted on the pump discharge chamber
to
prevent the pressure exceeding the
rated maximum pressure
of
the whole system.
b.
Automatic
pressure regulating valve (unloading valve) - Limits the pressure at
which the high pressure pump operates by releasing a preset proportion
of
the
generated flow back to the pump suction chamber or to waste.
It
may be used to
regulate the water pressure from the pump and is individually set for each operation.
This device may be integral with the pump hydraulic assembly. Where there is no
demand for pumpage, the water pressure is brought down
to
zero.
c.
By-pass
valve - A device which can be adjusted
to
control the flow, and thus the
pressure,
of
the jet stream issuing from the nozzle by by-passing the excess flow to
another circuit.
© Copyright January,
2001
NLB Corporation
2-14
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