This part of IEC 63458 contains safety-related requirements for high pressure water jet units
with drives of all kinds (e.g. electric motor, internal combustion engine, air and hydraulic) in
which pumps are used to generate pressure. This document deals with all significant hazards,
hazardous situations and events arising during assembly, erection, operation and servicing
relevant to high pressure water jet units, when they are used as intended and under conditions
of misuse which are reasonably foreseeable by the manufacturer. All references to high
pressure water jet units within this document include machines for one or more of the following
industrial applications:
– cleaning;
– surface preparation;
– material removal;
– readjustment of concrete;
– cutting.
NOTE 1 List of significant hazards is given in informative Annex B.
This document applies to mobile and fixed high pressure water jet units, in which the water
pressure is generated by a pressure generator/pump and in which the maximum allowable
working pressure is more than the upper limit fixed in the scope of IEC 60335-2-79.
NOTE 2 35 MPa is currently the upper limit for machines covered by IEC 60335-2-79.
This document does not cover:
– high pressure cleaners which are dealt with in IEC 60335-2-54;
NOTE 3 IEC 60335-2-54 applies to steam cleaners for household use. IEC 60335-2-79 applies to high pressure
cleaners having a rated pressure not less than 2,5 MPa and not exceeding 35 MPa, as well as steam cleaners and
those parts of hot water high pressure cleaners incorporating a steam stage which have a capacity not exceeding
100 l, a rated pressure not exceeding 2,5 MPa and a product of capacity and rated pressure not exceeding 5 MPa.
– additional hazards due to the incorporation of high pressure water jet units into other
process-technology machines;
– specific hazards associated with explosive atmospheres, use on ships or ambient
temperatures outside the range 5 °C to 40 °C;
– hazard due to the nature of liquids used for jetting, other than that due to pressure;
– hazards associated with the drives or specific hazards due to any heat generation function.
However, the hazards due to high temperatures of touchable surfaces are dealt with;
– high pressure water jet units which are manufactured before the date of its publication as
IEC standard;
– high pressure water jet hoses which are covered by IEC 63458-2;
– high pressure water jet spraying device which are covered by IEC 63458-3;
Tests according to this document are type tests unless they relate to routine (informative) tests
to be carried out during series manufacture.
NOTE 4 Routine tests are described in informative Annex A.
Compliance with IEC 63458-1, IEC 63458-2 and IEC 63458-3 provides the full requirements for
high pressure water jet machines.

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