Safety in the Plant
Overspeed switch protects plant and personnel
D
ue to the extreme conditions faced by people and machines alike, particularly stringent safety regulations apply to plant and systems operated in heavy industry. To fulfil these requirements Johannes Huebner Fabrik elektrischer Maschinen GmbH offers the EGS(H) 41 electronic overspeed switch that operates independent of the closed-loop speed control system. The EGS(H) 41 is certified up to Safety Integrity Level (SIL) 2 in accordance with the international standard IEC 61508 as well as up to Performance Level (PL) d to DIN EN ISO 13849. The EGS(H) 41 is the only overspeed switch worldwide certified to this standard. Consequently, it guarantees the operator the highest level of plant safety and serves to protect personnel. With an integrated sensor, logic circuitry and an actuator the EGS(H) 41 functions as a complete system. The speed is sensed, evaluated and switched in sequence. The safety device is equipped with two separate, electrically isolated and, as a consequence, complete switches to monitor speed that can be programmed independent of one another to monitor overspeeds and underspeeds from 0.5rpm. In this instance the electrical insulation generates a huge advantage in comparison with mechanical centrifugal switches, which would need a second device for the same function. A further
switch automatically monitors safety functions relevant to the hardware and software modules (diagnostics). The EGS(H) 41 also features integrated overcurrent detection and monitors the status of the wear- free, electronic switching contacts as well as optional standstill and slip monitoring.
Johannes Huebner Giessen developed the device specifically for use in heavy industry, including steel and rolling mills. The protective measures put in place in those fields within the concept of ‘functional safety’ are responsible for the proper functioning of safety-related systems to reduce risks. Hence, according to international standards the systems must carry out their functions under defined fault conditions with a high degree of probability. The company off accessory components to securely mount the EGSH 41 up to Performance Level (PL) e. The components with failure exclusion guarantee are available to securely mount an individual device as well as a combination of the EGSH 41 and the new absolute encoder ASPAH 60. This compact and robust combination of devices is often deployed on main drives in heavy industry applications.
Johannes Huebner Giessen developed the SIL 2 certified overspeed switch EGS(H) 41 specifically to meet the challenges and safety requirements of heavy industry
The ASPAH 60 automatically provides an absolute value (parallel interface) at the first terminal box to control the position of the pulse wheel as well as two electrically isolated signals in the second terminal box to control the speed and for higher level automation purposes. Equally equipped with two terminal boxes the EGSH 41 has four programmable safe switching outputs; these can be used, for example, to monitor standstill status, safety limited speeds and impose overspeed protection requirements. n
For more information, visit
www.huebner-giessen.com
Safeguarding high-pressure reactors P
olyetheylene was first produced in the UK in the 1930s by heating ethylene
gas at very high pressures to produce a white solid. Today’s production processes can be divided into two distinct ‘high-pressure’ and ‘low pressure’ operations to produce low- density polyetheylene (LDPE) and high-density polyetheylene (HDPE). Both production processes require specialist overpressure protection, but LDPE production is particularly dangerous due to the extreme pressures involved. Rupture discs from Rembe protect a number of LDPE plants around the world.
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“The challenge of high-pressure applications such as LDPE production is one that our engineers relish, and we are proud to be able to protect such processes,” said Claire Lloyd from Rembe.
Rembe rupture discs are used in LDPE plants across the globe
Rembe was recently approached a leading multinational company to protect its polymer plant in Belgium and help to bring it in line with European regulations on pressure equipment.
For this project, Rembe used its expertise in high-pressure rupture disc applications to produce a batch of specially designed welded assemblies that have a much longer life span than such applications can usually expect. n
For more information ✔ at
www.engineerlive.com/epe For more information visit
www.rembe.de
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