An increase in vent gas can indicate the need for preventative maintenance as the seal quality degrades. The use of a flow meter to monitor the primary and secondary vent gas on a dry seal serves two purposes. Natural gas compressor stations commonly utilise dry gas seals that can be a considerable source of fugitive methane emissions. The US Environmental Protection Agency’s (EPA) 40 CFR Part 60, Subparts OOOO and OOOOa, identifies CH4 as a significant greenhouse gas, global warming concern in the oil and gas industry. The continuous monitoring of gas compressor equipment for seal leaks is essential for safety, predictive maintenance, operational efficiency and to meet various federal and state environmental regulations. Approvals available for the ST100L Flow Meter include: FM, FMc, ATEX, IECEx, EAC/TRCU, CPA, NEPSI, InMetro, and CE Approved.Fluid Components International (FCI) has unveiled ST75 Series Thermal Mass Flow Meter that is set to provide precision measurement in small lines for the detection of hazardous, non-compliant and costly gas leaks ST100L flow meters are agency approved for hazardous environment installations. The transmitter enclosure is NEMA4X/IP67 rated and available in painted aluminum or stainless steel. The transmitter/electronics can be integrally mounted with the flow body or may be remote mounted to 1000ft away. ![]() The ST100L utilizes constant power thermal mass flow sensing technology that measure flow with 100:1 turndown in ranges from 0.006 to 1850 SCFM. The logging feature is selectable via the front panel menu or via the serial port and configuration software tools. Recording time base is user selectable with a maximum rate of one reading per second. The micro-SD card has a two gigabyte capacity capable of storing approximately 21 million readings. Readings are stored in a removable, internal micro-SD card. The ST100L’s electronics include a user selectable and programmable data logger. ![]() The readout continuously displays all process measurements and alarm status for on-site viewing by technicians, and it has the ability to query for service diagnostics. The ST100L was developed with a graphical, multivariable backlit LCD display. ![]() Should a plant’s or process communication need change, the ST100L can be converted to any of these outputs with a simple card change in the field. When selecting the ST100L flow meter, users have multiple communication options: 4-20 mA analog, frequency/pulse, or certified digital bus communications such as HART, Foundation Fieldbus, Profibus PA or Modbus RS485. Designed with no moving parts it also virtually eliminates wear, breakage and maintenance. Offering direct gas flow measurement, no additional sensors or flow calculating devices are required for measurement. The ST100L is a thermal dispersion technology air/gas flow meter which combines feature- and function-rich electronics with flow sensors for air/gas flow measurement. The elimination of threaded connections removes a potential leak path from standard meter compression fittings, which are threaded and can be a hazardous gas leak source. The connection incorporated into the design of the ST100L flow meter is inherently thread-less. It measures a wide range of gases: natural gas, hydrogen, helium, methane, ethane, propane, ethylene, nitrogen, carbon dioxide and many other specialty gases. With its all-welded flow element connection, the ST100L meter features a high pressure rating of up to 3000 psig. ![]() The ST100L flow meter is an in-line spool piece mass flow instrument developed for air/gas measurement. Fluid Components International’s (FCI) new model ST100L air/gas in-line thermal mass flow meter features an all-welded, no-thread flow element connection to provide flow measurement in demanding high-pressure industrial operating environments.
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