FCI FLT93L Series FlexiSwitch fractionation switch

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For the natural gas liquids (NGL) fractionation process to work efficiently and safely, the operation requires early and reliable indication of when a relief valve leaks or lifts during an overpressure situation. The FLT93L Series FlexiSwitch from Fluid Components International (FCI) can be used to accurately monitor the pressure relief valves for escaping flow with its thermal dispersion technology flow sensing switch/alarm.

In this application, an inline configuration FLT93L is placed on DN15 and DN25 diameter pipes. The FLT93L switch detects leaking or seeping gas in the lines to alert the engineer to overpressurisation. For the system to work properly, the FLT93L must detect low flows and yet avoid issuing false alarms that could seriously impact plant operations.

The FLT93L switch is easy to install and set up: FCI’s voltage output allows users to see into the process and accurately set the desired trip point. Flexible dual relays are settable by the plant technician for any combination of flow and/or temperature alarms.

The FLT93L switch’s flow accuracy is ±2% of the setpoint velocity over a ±28°C temperature range. Repeatability is ±0.5% of reading.

A wide selection of standard and custom process connections can be provided. The electronic control circuit can be integrally mounted with the sensing element, or it can be located in a remote location. The standard enclosure is a coated aluminium alloy and is rated for NEMA Type 4X (IP67) environments. Global agency approvals for Ex installations are provided, and it is SIL 2 rated for reliability.