Electrical Power & Protection

Electrical machines with hazardous area certification

October 2015 Electrical Power & Protection

Rockwell Automation and local electro-mechanical equipment solutions provider Actom Electrical Machines have been awarded a hazardous area certification for the oil and gas industry by Explolabs. The Exn certification was awarded subsequent to the testing and assessment of the Actom MS4 452-4 non-sparking Ex nA IIA and IIB T3 motor and Allen-Bradley PowerFlex 7000 medium voltage AC drive combination(s) for compliance to “Electrical apparatus for explosive gas atmospheres – General Requirements” (SANS 60079-0: 2012 Ed 5) and “Equipment protection by type of protection ‘n’” (SANS 60079-15: 2010 Ed 4).

As a subset of a larger project, five Allen-Bradley PowerFlex 7000 medium voltage AC variable speed drives by Rockwell Automation and five Actom motors will be used by Engen Petroleum’s Greenfields project to control Flowserve’s 1320 m³/h centrifugal pumps, facilitating the movement of product from Engen’s Island View facilities to Transnet’s NMPP Island View West site. Rockwell Automation’s PowerFlex 7000 are fitted with an 11 kV to 6,6 kV integral transformer to power Actom’s 650 kW, 6600 V, 4 pole motor situated in the hazardous area.

The VSD and motor combination test was conducted to determine the maximum surface temperature of the motor in accordance with SANS 60079-0: 2012 Ed 5 Clause and Annex E, which included the monitoring of the motor winding temperature; ambient temperature; DE & NDE bearing temperatures; and motor supply voltage, current and rpm. The combination test was conducted at the motors maximum duty point for 8 continuous hours.

Explolabs found that the drive and motor combination complied with the requirements set out in the standards and certified the installation for ‘Zone 2’ (‘Gas: Surface’) application, i.e. as the ‘location’ while the ‘environment’ is listed as ‘Group IIA and IIB’. ‘Frequency’ is listed as ‘abnormal’ as could occur under normal operation.

“Considering the criticality of this project and the stringent Engen specification meant we needed to supply a reliable solution that conformed to all the requirements of the various stakeholders,” says Henry Craukamp, ETO sales manager – Southern Europe and Africa. “The test results prove the compatibility between Rockwell Automation drives and Actom’s motors, one of the reasons we entered into our co-operation agreement in 2013.” This agreement is to supply Rockwell Automation and Actom customers with appropriately paired variable speed drives and motor products.

The now Exn-certified VSD and motor combination was delivered to site and the installation completed. The Rockwell Automation commissioning team is on stand-by to begin on-site commissioning as soon as Engen completes the remainder of the installation.

“Rockwell Automation is extremely pleased with the outcome as it verifies that our VSDs have no temperature effect on the motor whatsoever. The tests further prove that our VSDs and Actom’s motors are compatible in one of the harshest environments. We will continue the certification process with our low voltage PowerFlex 755 series VSDs and Actom’s low voltage motors,” Craukamp explains. He adds that Engen Petroleum indicated it was extremely satisfied with the result.

For more information contact Henry Craukamp, Rockwell Automation, +27 (0)11 654 9700, hscraukamp@ra.rockwell.com, www.rockwellautomation.co.za


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