Revision 1
II. Safety Aspects of High Pressure Water Cleaning Systems
For maximum operational safety, the following equipment and manual procedures must be
used where applicable:
A.
Equipment
High Pressure Pump
The principal component
of
the high pressure water jetting cleaning system is usually a
positive displacement high pressure pump which discharges water into a common manifold
to
which flexible hoses or lances with nozzles or other cleaningor cutting accessories are
attached. The pumps are appropriately powered and can be either mobile or permanently
mounted. They shall never be operated above NLB's recommended operating pressure.
Relief System
The system shall be equipped with an automatic relief device on the discharge side
of
the
pump, adjusted so that the maximum allowable working pressure of the system is not
exceeded by more than 3%.
Pressure Gauge
The system shall be equipped with a gauge
to
indicate the pressure being developed.
Filter
or
Strainer
The water system shall be equipped with a filter or strainer to prevent particles from entering
the high pressure pump and damaging the plungers.
Dump System
The system shall be equipped with a device which will by-pass the flow or dump the
discharge pressure
to
a safe level immediately when actuated.
An
operator shall control this
dump system.
Hose Assembly
Hose assemblies used on the discharge side of the pump shall have a safety factor
of
3.0
based on the manufacturer's rated minimum burst pressure.
Fittings/Valves
All fittings and valves used in the discharge side
of
the pump shall have a safety factor
of
3.0
based on the tensile strength
of
the materials.
Electrical Controls
All electrical controls handled by personnel shall be either fail safe, low voltage or protected
with an approved ground fault circuit interrupter.
© Copyright January,
2001
NLB Corporation
2-8
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