OFON 2
Integration
​
Advanced Building Controls was engaged by Mizco, to assist in the completion of HVAC project for the OFON 2 gas processing platform, although generally all systems within this industry are operated using process PLC systems such as Allen Bradly and Siemens, this project had been design to incorporate a TREND control system, for the operation of Airlock and Plant room reheater units. The main controls operated from an Allen Bradley Logix PLC, Engaged at the beginning of the project, we not only engineered the TREND control strategy and system for the reheaters, but also successfully integrated the TREND controls system using BACnet communication to Field Servers, enabling all the data to be accessed from the Allen Bradley control centre, in addition to this the Carrier chillers using CCN (J Bus), were also added.
Thus the entire system was seamless in operation.
I
Integration
​
Advanced Building Controls was engaged by Mizco, to assist in the completion of HVAC project for the OFON 2 gas processing platform, although generally all systems within this industry are operated using process PLC systems such as Allen Bradly and Siemens, this project had been design to incorporate a TREND control system, for the operation of Airlock and Plant room reheater units. The main controls operated from an Allen Bradley Logix PLC, Engaged at the beginning of the project, we not only engineered the TREND control strategy and system for the reheaters, but also successfully integrated the TREND controls system using BACnet communication to Field Servers, enabling all the data to be accessed from the Allen Bradley control centre, in addition to this the Carrier chillers using CCN (J Bus), were also added.
Thus the entire system was seamless in operation.
I
OFON 2 during construction at the Hyundia shipyard in Korea
Works carried out
This 16,500 ton gas processing platform was manufactured in Korea, once completed, this magnificent feat of engineering was loaded on to a boat and taken to its final resting place some 40Km of the Nigerian delta oil fields.
The HVAC system consisted of two AHUs suppling air to the various airlocks and plant rooms, vis electric reheat boxes.
The main plant consisted of two Carrier water cooled chillers, various pumps and seawater heat exchangers, the main plant was centrally controlled via an Allen Bradley RX Logix PLC.
OFON 2 resting in its final location
View inside main HVAC control panel during commissioning, note TREND IQ3 controllers
Ahu cooling control valves and temperatures where controlled from a TREND IQ3 controllers, the reheater units in the field utilised the older TREND IQ2 terminal controllers, the proprietary TREND controllers utilised the BACnet protocol mapped back to the RS Logix PLC using FieldServers.
In addition the two Carrier chillers were also connected to Fieldserver, using there standard JBUS protocol.
All required data was displayed and confirmed on the RS Logix display terminal located in the control panel door.
Points where required to be read and written back to the PLC to confirm changes had been made.
Even TREND network connection status was monitored, and alarmed should there be a communications failure.
The complete TREND HVAC system and associated Fieldservers, together with the Carrier CCN, was engineered, configure and demonstrated by Advanced Building Controls.
We provided all O&M documentation, a very interesting and enjoyable project!
RS Logix central HVAC control display
