Increasing safety levels

Although tanks were equipped with an Automated Tank Gauging System, our customer's standards in compliance with the latest recommendations from API (API2350 4th ed.) required an independent high-level alarm system to prevent overfilling, separate from any device and method used for ATG.

Specifications required SIL3 level switches according to IEC61508, IEC 61511-1/ certified by TŰV, based on the vibrating fork principal, and continuously self-monitoring.

We delivered the market standard overfill prevention system and related services fulfilling customer's requirements for:

• Testing and commissioning of SIL3 level switches and system cabinet

• Installation of cables, conduits, junction boxes, UPS, sounder and beacon light

• Commissioning, testing, start-up and training

• After Sales support

• Hotline support 24/7

• Compliance and execution of project according to customer's standards - Zero LTI

We provided a turn-key solution including:

• Procurement of all material and instruments

• Detailed design & engineering

• Cabling

• Installation

• Testing

• Commissioning

• Start-up and hand over

• Training of operators

• After sales support

The Overfill Prevention System in compliance the latest API 2350 standards, is a modular SIL3 solution for level monitoring and alarming in case of detected risk of overfill. In case of any error or alarm, visible and audible notifications are activated and the related messages are shown on the display and on cabinet with the possibility to have more details about the failures.

• Detailed engineering July 2012: Once the order was accepted, the detail design was completed to include instrumentation design, cabinet, cabling, excavation and project documentation.

• Factory acceptance tests: Key components of the project including instrumentation and the cabinet passed the FAT prior to installation to confirm their compliance with the specifications. By mid-November 2012, all components were shipped and the installation work started.

• Site installation: All involved personnel went through the customer's safety training. Method Statements, Risk Assessments and Work Permits were issued prior any work to be carried out onsite. Site installation was completed on time according to all customer's safety procedures.

• Site Acceptance Test: In December 2012, all site work was completed. The system was inspected and verified based on the customer's standard functional test. Personnel training and hand over followed.

• Endress+Hauser Fail Safe Liquiphant S level Switches, SIL3 certified.

• Control Cabinet equipped with safety SIL3, Allen Bradley PLC and IOs, graphic and text Displays, SIL sounders and beacon lights.

• Automated Proof Testing Procedure.