Dedicated level solution
About half of all energy consumed by the Netherlands comes from natural gas. After natural gas is produced, it is transported by pipe- line to a processing facility where the raw gas is cleaned, and impurities such as water, carbon dioxide, and hydrogen sulfi de are removed. If required, the gas can be compressed to higher pressure to enable it to enter the gas grid.
The cleaning of the raw gas is done in treatment centers. One of the treatment centers in the North West of Holland went operational in 1977. In 1977 it was a state of the art treatment center and has been fully functional without any large updates. The installation was still pneumatically operating.
Due to the lack of spare parts and the decreasing knowledge of these obsolete instruments, the treatment center decided to update the center to an I/O driven production location according to SIL safety standards. The upgrade had to be carried out in a limited timeframe and included the replacement of level measurement instrumenta- tion, using the already existing nozzles’. Besides, the vessels, separators and tanks have to meet "Stoomwezen" regulations, no changes coud be done without the needed recertifi cation.
An external engineering company received the order for updating the complete installation. KROHNE as a preferred vendor of the end user, with a high installed base, was requested for support in the pre-engineering phase.
In total 29 level instruments had to be retrofi tted to meet the highest safety demands.
The complete installation had to be SIL 2 compliant. For this reason the level instru- ments in the vessels had to be redundant. The operators wanted to have local indicators on the tanks and this had to be realized without adding additional nozzles.
Within the short time frame KROHNE had to develop a solution which met the PED regula- tions, SIL demands and client specifi cations. The application team at the Level Center in KROHNE France designed, calculated and quoted the solutions.
Instead of designing an instrument which combines two different principles in one instrument, the visual indicator and the I/O level measurement were split. The advan- tage: “standard” equipment could be used with the customers PED calculations and combined later on in the installation on the tank nozzles.
For the level switches, the standard switching forks were used. The engineering company and the end user were convinced, the solution given was the best and KROHNE could meet the deadline.
Timewise the production of the level instru- ments had some challenges as non-standard fl ange connections were required to enable installation on the existing nozzles. Great dedication was shown by the KROHNE produc- tion department that put in extra hours during the summer holiday season to guarantee on time delivery of this fast track order.
OPTIFLEX 1300 C on tank
OPTIFLEX 1300, OPTISWITCH 5200 and BM26
Highlights OPTIFLEX 1300 C • Displays level and interface • PACTware and DTMs included as standard • Optional second current output – used for displaying interface measurements • Optimal process safety (with Metaglas® • Available in stainless steel and HASTELLOY®
dual process sealing system) C-22®
Hightlights OPTISWITCH 5200 C
• Standard or HT version, large array of process fi ttings, housings and electronics
• Probe length up to 6000 mm . Other materials on request
• Angled single cable and rod probes are available on request for installation in tanks which contain obstructions
• Process connection option for high temperature up to 250 °C
• Outputs: relay, transistor, 2 wire, NAMUR or contactless electronic switch
• With all relevant approvals
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