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This Directive shall apply to simple pressure vessels (‘vessels’) manufactured in series with the
following characteristics:
(a) the vessels are welded, intended to be subjected to an internal gauge pressure greater than 0,5 bar
and to contain air or nitrogen, and are not intended to be fired;
(b) the parts and assemblies contributing to the strength of the vessel under pressure are made either of
non-alloy quality steel or of non-alloy aluminium or non-age hardening aluminium alloys;
(c) the vessel is made of either of the following elements:
(i) a cylindrical part of circular cross-section closed by outwardly dished and/or flat ends which
revolve around the same axis as the cylindrical part;
(ii) two dished ends revolving around the same axis;
(d) the maximum working pressure of the vessel does not exceed 30 bar and the product of that pressure
and the capacity of the vessel (PS × V) does not exceed 10 000 bar.L;
(e) the minimum working temperature is no lower than – 50 °C and the maximum working temperature is
not higher than 300 °C for steel and 100 °C for aluminium or aluminium alloy vessels.
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