Protecting remote valve stations on an ethylene pipeline

14 June 2011

Safety system integrator, Hima-Sella has provided 20 programmable electronic systems to protect valve stations along the 250km long Wilton-Grangemouth ethylene pipeline owned by SABIC UK Petrochemicals.

The pipeline is one of a number that are used to link ethylene production plants in the UK.
The installations are part of an upgrade programme which commenced in 2010 and includes the replacement of the valve stations’ Remote Terminal Units (RTUs) and hardwired valve interlocks with a BS EN 61508 safety system.

At the valve stations, which are in remote locations, a number of parameters are monitored including valve positions, upstream and downstream pressures, temperatures, cathodic protection, battery charger status and product flows. Hima-Sella’s solution for localised safety within each valve station is the HIMatrix F35 Programmable Electronic System (PES), which has 8 analogue inputs, 24 digital inputs, eight digital outputs, three Fieldbus ports and four configurable Ethernet ports.

All 20 PESs for the WGEP upgrade were programmed by Hima-Sella, using its own IEC 61131-3-compliant ELOP II software tool.

In a separate contract, the company has also provided a Safety Instrumented System (SIS) – again based on a HIMatrix PES – to SABIC UK Petrochemicals to protect its Teesside, Arthur Taylor Jetty Arm. Located in a Jetty Electrical Hut, the SIS is a standalone SIL 3 system with fail-safe inputs and outputs.

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