Total Exploration and Production (Total E&P) is a subsidiary of the Total Group, operating in over 120 countries worldwide. Total E&P is among the largest oil and gas producers on the UK Continental Shelf. The Aberdeen, Scotland, headquarters of Total E&P employs about 750 people, and operate or own significant interests in the Alwyn Area fields in the UK Northern North Sea, the Elgin Franklin Area fields in the Central Graben Area North Sea, and the St. Fergus Gas Terminal on the north east coast of Scotland.
For the past several years, production engineers at the Aberdeen facility have been using the OPC protocol to gather data at their terminals. Recently their management asked them to connect the terminal system to the corporate networks, to gain access to valuable production data in real time. When the engineering team set about making the connection they soon ran into the problem that many others have experienced: OPC works well on a single machine, but not so well over networks, particularly firewalled networks like theirs. This is because OPC relies on DCOM for networking, and configuring DCOM security to work through firewalls is known to be a significant challenge for even the most experienced network professional.
"These are secure systems, and OPC doesn’t like to go through firewalls," said Rob Sidebottom, project leader. "We did manage to get DCOM working, but it was so slow. Our large amount of data was the problem."
So they decided to try OPC tunnelling, which bypasses DCOM by using TCP to send data across the network. They tested several OPC tunnelling products, and chose the OPC DataHub because of its ease of use, reliability, and extra features. "The OPC DataHub is a powerful tool," said Rob. "Quick and robust, it’s just what we wanted."
To configure the tunnel, the team first connected one OPC DataHub to their OPC servers running on the terminal system. Next they configured the DataHub on the corporate network to connect through the firewall to the first OPC DataHub. Finally, they simply configured the OPC client programs on the corporate system to connect locally to the second OPC DataHub. This completely removed any need to configure DCOM or security settings on either computer.
"The OPC tunnelling is going well, no problems," said Rob after several months of operation. "We are just doing tunnelling at the moment, but there are lots of possibilities. It is quite a powerful conversion tool, and it will come in handy for other uses."
OPC DataHub is a trademark of Cogent Real Time Systems. Software Toolbox is a trademark of Software Toolbox, Inc.