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Focus Componentistica e servizi per l’impiantistica INFORMAZIONE PUBBLICITARIA
PROGETTAZIONE

R. STAHL TESTATA. LA MIGLIORE

Flameproof enclosures receive TECNOLOGIA ,

a cutting-edge update DA R. STAHL .

Flameproof enclosures, a type of protection already Spurred on by this success, R. STAHL joined forc-
prevalent internationally for explosion-proofing es with several well respected German universities
electrical equipment, have undergone an impres- of applied science and Germany’s two leading test
sive facelift. Instead of heavy, bulky cast and steel bodies, PTB and DEKRA EXAM, working closely
constructions, innovative material combinations with these institutions. The end result was a spe-
and technologies can now be employed to create cial, woven wire mesh developed specifically for the
innovative control cabinets that, despite being vir- purpose of providing effective, flameproof pressure
tually indistinguishable from their counterparts in relief. The metal mesh is woven from fine stainless
non-hazardous industrial environments, can still be steel wires and consists of several layers, stacked
used in Zone 1 without restriction. one above the other. Numerous tests were con-
ducted to optimise the geometric and technolog-
New pressure-relief solu- ical parameters of each of these layers, such as
tion wire gauge, mesh size and weave. The different
A few years ago, R. STAHL layers are then sintered together to form a robust,
began working with ad- integral structure. Besides its flameproof proper-
vanced lightweight-construc- ties, the finished woven wire mesh boasts good
tion principles with the aim of gas permeability, mechanical strength and thermal
eliminating the technological capacity, while at the same time exhibiting relative-
drawbacks and limitations. ly low thermal conductivity, making it the optimal
Their work also encompassed choice for integrating into flameproof enclosures.
numerous tests involving dif- Using special processes, it can either be cast into
ferent porous materials. The cast aluminium enclosures or welded into stainless
idea behind these tests was steel enclosures. In the event that an explosive at-
to discover reliable, effective mosphere ignites within an enclosure that has been
R. STAHL’s innovative EXpressure technology is based
on a multilayered, woven stainless steel mesh with flow ways of multiplying the effect prepared as described, the chemical energy that
channels that allow energy generated by explosions to of flameproof gaps that would is released is very quickly and efficiently dissipat-
be safely dissipated allow for a significantly great- ed. Various physical effects come into play at this
er reduction in pressure, in stage, which we can only touch on briefly here.
significantly less time, follow- The gas-permeable woven mesh permits a rapid
ing an explosion within the release of pressure to the outside. In the process, IL LATO LUMINOSO DELLA SICUREZZA
enclosure. Developing, and depending on the location of the ignition source in
subsequently patenting, a the flameproof chamber, some of the uncombust- La nuova serie di armature illuminanti con tecnologia LED di Stahl, EXLUX 6002
pressure-relief element made ed gas/air mixture is forced out, preventing it from

from porous, sintered ma- fuelling an explosion. However, a significant fraction stabilisce nuovi standard di sicurezza, durata ed efficienza. L’innovativa tecnologia

terial was an important first of the resultant reaction heat is absorbed by the LED assicura un flusso luminoso di 5,800 lm ed un’erogazione di luce ben oltre i 100
milestone for the company. mesh/air structure of the woven wire mesh and is lm/W con una durata prevista di 100,000 ore. Il corpo in GRP leggero e compatto,
This element, which obtained consequently not available for reducing the pres-
its ATEX certification back sure inside the enclosure. permette una semplice e sicura installazione per l’utilizzo dai – 30 °C ai +55 °C.
in 2015, was able to reduce The result is remarkable: While a conventional Ex d
The side walls feature permeable pressure-relief pressure by 30% more than enclosure of equivalent size will give peak pressure Volete saperne di più? Visitate il sito stahl-explorers.com, troverete dettagliate
elements, are closed off on the outside by blowout conventional flameproof en- readings in the region of 10 bar, the new enclosures informazioni, i risultati dei più recenti stress tests e gli avvincenti esperimenti
panels and have IP66-rated protection closures. produce staggeringly low peak pressure readings,
effettuati. Non esitate a contattarci a info@stahl.it

76 76 Impiantistica Italiana - Luglio-Agosto 2020

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