Oman Liquefied Natural Gas LLC (OLNG) is a limited liability incorporated joint venture company established by a Royal Decree and operated under the laws of the Sultanate of Oman. It engages in the business of producing and selling liquefied natural gas (LNG) and byproduct natural gas liquids (NGL).
The Company undertakes, directly or indirectly, project operations and activities necessary to liquefy, store, transport and market Oman’s natural gas and to deliver LNG to customers in the global markets. The Company operates three liquefaction trains at its site in Qalhat near Sur with a capacity of 10.4 million tonnes per annum.
The produced gas at the Barik, Saih Nihayda and Saih Rawl gas fields are gathered at the Saih Rawl Plant - a gas field complex operated on behalf of the Government of Oman by Petroleum Development Oman (PDO) - in Oman’s interior. From there, a gas pipeline approximately 360 kilometres long and 48 inches in diameter with a gas capacity of 34 million cubic meters a day, is delivered to OLNG where the gas is liquefied.
The LNG production trains 1 and 2 located at the OLNG plant have been using Yokogawa CENTUM CS production control system (PCS) since 2000, and train 3 has been controlled by CENTUM CS since 2005. There have been no major issues in the process control systems over the course of these years.
With the discontinuation of the UNIX OS system, OLNG decided to take a phased approach to upgrade its systems from CENTUM CS to CENTUM VP for all liquefaction trains, a common facility upgrade involving other systems like Exaopc stations used for PI, APC (Exasmoc, Exarqe), and metering. Yokogawa’s eLogBook, an electronic logbook, is now an integral part of the OLNG day-to-day operations. Operator logging and handover applications are easily handled by this eLogBook. In addition, the central control room (CCR) renovation has been completed.