Part Number: Level Sensors For Overfill AST Protection FI-NM-DC-M ( DuoCheck™) FI-NM-V2-M ( Versalevel™-02) 8179802 FP ( Versalevel™-X2) NOTE: Single point sensors and numerous other types of level sensors are also available. Please consult factory for details. Background In the wake of the Buncefield disaster in the UK (December 2005), the various regulatory entities and standards organizations have been scrambling to upgrade recommended practices and procedures to minimize the risk for storage tank overfill and hopefully prevent a recurrence of this tragedy. The API 2350 subcommittee is working on the final draft for the 4th edition of Overfill Protection for Storage Tanks in Petroleum Facilities which will be released in the summer of 2008. This new edition will probably be used as the basis for an ANSI standard, which will make it the de facto standard for most of the world. It is anticipated that the new standard will require that all petroleum storage facilities be categorized based upon the type of product stored, and the way the tanks are filled. A Category 4 ( worse case) facility would store gasoline, and delivery would be at very high flow rates from a pipeline. No matter what Category a facility falls under, one of the main lessons learned from Buncefield is that an overfill protection system must be tested routinely. The entire system, from the level sensors to the alarms, must have a testing methodology which is representative of an actual alarm condition. As the industry’s premier tank monitoring experts, OMNTEC is committed to keeping our clients current with the latest requirements, and to providing “best-in-class” solutions for all their tank monitoring requirements. Solution One of the most important requirements for successful tank overfill protection is the selection of the proper sensor for the application. This is usually a function of the tank type, and the stored product. There are 3 basic types of aboveground storage tanks; namely, a) fixed roof, b) internal floating roof, and c) external floating roof. Of course, there are many other types of vessels, and application specific requirements such as heating and refrigeration which must be considered when selecting the proper sensors for overfill protection. OMNTEC has developed state-of-the-art level sensors for these 3 basic tank types. For all of these, we offer both single and dual point (HI + HI-HI) variants although we almost always recommend a dual point system. For fixed roof tanks ( FRT’s), the DuoCheck™ sensor is normally used. DuoCheck™ is a coaxial dual float switch which employs the MagLift™ pull-to-test mechanism. Many commercial level sensors feature a pull-to-test feature; however, many of these can provide misleading test results as the testing mechanism may transfer much more force to the sensor than its buoyancy can induce. MagLift 2” MNPT DuoCheck™ Sensor For fixed roof tanks ( available in various lengths) 1” MNPT Versalevel™-02 Sensor For internal floating roof tanks ( available in various lengths) MagLift 2” MNPT 1” FNPT
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