Growhow UK - Programmable Upgrade to ESD

Application: Programmable Upgrade to ESD
Installation Area: WNA Plant, Billingham, Teesside
Client: Growhow UK Ltd

GrowHow UK is the UK's premier fertiliser manufacturer and a major supplier to the process chemicals industry. Its extensive Billingham chemical plant produces and stores ammonia, nitric acid and ammonium nitrate and at the heart of the Teesside chemical cluster, is ideally placed for distribution in the UK and for export.

SELLA CONTROLS supplied the existing ESD in the 90s, a TÜV certified HIMA Planar F rack mounted solid state fail safe logic system installed behind a large operator wall mimic in the Weak Nitric Acid (WNA) 4 control room. The system operated well for many years with little maintenance required but the programmable upgrade provides extensive diagnostic and Sequence of Event (SOE) reporting facilities and dedicated communications to the Distributed Control System (DCS).

The TÜV certified HIQuad H51q system which can meet SIL3 requirements, was selected as a suitable replacement for the hardwired system. With dual CPUs and single failsafe I/O configured in this case to meet SIL 2, it was mounted in the same cabinet space and uses existing terminations in the adjacent marshalling panel. The PLC has dual Ethernet communications allowing vital diagnostic information to be transferred to the DCS, to operator Human Machine Interface (HMI) level. A separate, standalone PC with Wizcon Logline provides independent sequence of events recording (SOE) allowing operators and managers to see the chain of events for any given situation. This vital diagnostic tool allows operators to quickly and confidently assess plant issues and resolve them to ensure continuous, safe plant operation.

Download SELLA CONTROLS' Safety Systems brochure.

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