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Focus Componentistica e servizi per l’impiantistica INFORMAZIONE PUBBLICITARIA

with measured values far offshore applications. On the other hand, it is now
below 1 bar. By means of a also possible to build extra large fl ameproof control
carefully considered confi gu- cabinets. The largest “EXpressure” cabinet current-
ration, it has also been pos- ly available is 1400 mm high, 1000 mm wide and
sible to reliably prevent the 700 mm deep. Even larger cabinets are in the pipe-
outer surface of the mesh line. This makes project engineering signifi cantly
layers from reaching temper- easier for the reasons explained above. Whilst it
atures above the permissible may have been necessary in the past, using con-
value for temperature class ventional technology, to combine more than one
T4. And in order to ensure enclosure in order to accommodate complex con-
that the new solution works trol panels and distribution boards, you now gen-
In the event of an explosion inside the enclosure, the
blowout panels are blasted open; the mesh elements under a huge range of harsh erally only need a single “EXpressure” enclosure.
underneath then allow the pressure to safely dissipate ambient conditions, such as Sizable equipment, such as transformers and fre-
towards the outside environments where it is ex- quency converters, which could previously not be
posed to dirt or ice, it upgraded for use in hazardous areas or could only
is important to ensure be upgraded with great diffi culty can now safely be
that the exposed sur- installed in the spacious enclosures.
faces of the outer mesh The novelty of the solution means that there was
layers are properly pro- no risk to R. STAHL; ATEX and IECEx certifi cation
tected. This is achieved was conducted in parallel by the two well known
by fi tting conventional German notifi ed bodies and the certifi cates are al-
blowout panels, which ready available. With the ATEX system, certifi cates
provide IP66 protection have been issued solely for Ex d protection based
in normal operation but on the provisions set out in Annex II of Directive
are blasted open at a 2014/34/EU (this annex deliberately permits inno-
target pressure of 0.1 vative solutions that are not yet fully covered by
bar in the event of an the relevant harmonised standards). IEC 60079-1
Ex d enclosure with solid walls (left) versus EXpressure design
with pressure-relief elements coloured in blue (right) – for the explosion, allowing the and IEC 60079-33: Special protection have been
same dimensions, EXpressure enclosures boast a much gas to escape to the used for the IECEx certifi cates. The two test bodies
larger internal capacity coupled with signifi cantly reduced outside. mentioned acted as the two independent verifi ers
weight (the proportions shown are for illustrative purposes required by standard 60079-33.
only and are not necessarily true to life) Slimmer, lighter, more
versatile In short
The pressure reduction With the advent of R. STAHL’s “EXpressure” brand,
system described opens up whole new dimensions the market is witnessing a trailblazing new technol-
in fl ameproof enclosure design. The enclosures ogy for switchgears, control cabinets and distribu-
developed under R. STAHL’s “EXpressure” brand tion boards, as well as other electrical equipment
have walls around 3 mm thick. This brings them such as luminaires and process analysis technol-
almost into line with the dimensions of the equiv- ogy. The innovative enclosure design with pres-
alent industrial control cabinets, and has a signif- sure-relief elements offers a whole host of benefi ts
icant impact on the weight and compactness of to mechanical, apparatus and plant engineers and
the structure. Comparative calculations performed operators of process plants situated in hazardous
by way of example have indicated weight savings areas.
of approximately 30-50% when compared to con- R. STAHL has been able to overcome many of the
ventional switchgear and controlgear assemblies, disadvantages of conventional fl ameproof enclo-
with external dimensions being reduced by around sures and replace these with considerable custom-
25%. This is particularly useful in instances in which er benefi ts.
installations are to be packed tightly together for www.stahl.it

78 78 Impiantistica Italiana - Luglio-Agosto 2020