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Hima Paul Hildebrandt is upgrading an existing Hima emergency shutdown (ESD) system at a hexane oxidation plant belonging to Lanxess AG at the Krefeld-Uerdingen Chemical Park.

As Lanxess planned to shut down the plant for a short period before commissioning, it decided to conduct a factory acceptance test (FAT) using the expanded and modernised safety system.

A concept was drawn up together with Lanxess and the system was replicated 1:1 at Hima in Bruhl.

All the functions were tested as part of the FAT in collaboration with staff from Lanxess, TUV Sud Chemieservice and Hima.

This enabled the commissioning time to be reduced to a minimum.

Lanxess uses the plant to produce KA oil, a primary product used to make thermoplastics.

KA oil is a mixture of cyclohexanone and cyclohexanol and is produced by the oxidation of cyclohexane.

In the event of an accident, a process involved in producing KA oil may need to be shut down.

The task of the ESD system is to deactivate the reaction in the event of danger and relax the process.

Among its most important tasks is the monitoring of limit values and control valves.

The Hima safety system has been in operation at the plant since 1999.

The new project involved adding two module racks and input/outputs (I/Os) and extending the communication with the process control system.

New central modules with larger memories have been incorporated.

In addition, the Elop II engineering tool was upgraded using the Ethernet protocol for its connection to the engineering PC.

The link with the Siemens control system is a Profibus-DP.

The ESD system, consisting of an H51q safety controller with nine input/output module racks (IOMRs), is housed in two switchgear cabinets.

A total of 936 I/O signals are processed with respect to safety.

Lanxess, a specialist chemical producer, uses Hima’s Planar F, Hiquad and Himatrix systems in its plants all over the world.

Hima Paul Hildebrandt

HIMA Paul Hildebrandt GmbH Co KG – safety-related automation solutions for process, machine and building safety HIMA solutions, whether for critical safety applications in the process industry, in machine or in building automation, protect people, assets and the environment in more than 80 countries around the globe.


What distinguishes HIMA solutions from the rest, is the combination of maximum safety and maximum availability. Only through permanent safety and uninterrupted operation are HIMA’s clients able to achieve their business goals.


HIMA solutions are based on practically-focused safety consulting, wide-ranging application experience, a comprehensive product range and the ability to successfully integrate safety solutions into almost any automation environment.


All HIMA systems and solutions comply with the latest international and local safety standards like IEC 61508 and IEC 61511, EN 954, EN ISO 13849 and are suitable for SIL 3 and even SIL 4, Cat. 4 and PL e applications.


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