Hima-Sella strengthens plant diagnostics at GrowHow UK06 May 2010

Fertiliser manufacturer GrowHow UK's Teesside Billingham plant is to get an upgraded ESD (emergency shutdown) system – to TÜV certified HIQuad H51qHS standards.

Systems integration specialist Hima-Sella is providing the system for the plant, which produces and stores ammonia, nitric acid and ammonium nitrate.

Hima-Sella supplied the existing ESD in the 90s – a TÜV certified Hima Planar F rack-mounted solid-state failsafe logic system, installed behind a large operator wall mimic in the Weak Nitric Acid (WNA) 4 control room.

Plant managers say that the system operated very well for many years, with little maintenance required, but that the programmable upgrade provides extensive diagnostic and sequence of event reporting, as well as dedicated communications to the DCS (distributed control system).

Its new system can meet SIL3 requirements – with dual CPUs and single failsafe I/O, configured in this case to meet SIL 2. It will be mounted in the same cabinet space and use existing terminations in the adjacent marshalling panel.

The PLC will have dual Ethernet communications allowing vital diagnostic information to be transferred to the distributed control system (DCS), to operator Human Machine Interface (HMI) level.

Brian Tinham

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