Flow Level Pressure Coriolis Flowmeters for Natural Gas Custody Transfer
The CNGmass Coriolis flowmeter series from Endress+Hauser (USA) is approved by NTEP in the U.S. and five other international standards organisations for custody transfer of compressed natural gas (CNG) and for fueling vehicles with CNG. Available in three common sizes from 3/8 to 1 in., the CNGmass measures mass flow up to 330 lb/min (150 kg/min) at fluid temperatures up to 257F (125C) and pressures to 5,080 psi (350 bar). The instrument measures direct mass or corrected volume flow with 0.5% accuracy to meet custody standards. It also outputs temperature and density. Because the Coriolis flowmeter is a balanced two-tube design, it is insensitive to pipeline vibrations, and can be installed without taking inlet or outlet runs into consideration.
When used for custody transfer, the flowmeter is verified on site using reference measurements approved by the local authority for legal metrology controls. The flowmeter must be locked for custody transfer measurements and sealed by authorised personnel, but it can easily be converted back to normal measurements. The flowmeter is approved for custody transfer by NTEP (U.S.), PTB (Germany), NMi (Netherlands), METAS (Switzerland), BEV (Austria) and MC (Canada).
The CNGmass flowmeter carries approvals for use in hazardous areas from UL, ATEX, FM, cCSAus and NEPSI. The transmitter housing is powder-coated aluminium, the sensor housing is acid-and alkali-resistant 304 stainless steel, and all process connections are 316 or 316L stainless steel.
A multi-color LED on the transmitter housing indicates, by various colours and flashing intervals, the status of the instrument and the process conditions—such as creepage, system working/not working, custody transfer mode started, or explicit Modbus messages.
Output options for the CNGmass 8DF/8FF include pulse/frequency signal, 4-20mA current with HART, 30Vdc status output for fault or power supply failure, or MODBUS RS485 output in accordance with the EIA/TIA-485 standard designed for custody transfer applications in dispensing or fueling in the compressed natural gas industry. The MODBUS output contains flow rate, totaliser, temperature and density information, system or process notifications, and security status identification.
Four configuration methods exist for this product. Endress+Hauser’s FieldCare software can be used for on-site configuration, verification and diagnostics. The instrument can also be configured via HART, manually via the local display, or with a plug-in EEPROM.
Reader Reply Card No 118
Wave Radar Receives SIL3 Certificate from Exida
New Cost-effective TDR Level Meter
Krohne (Germany) introduces the new OPTIFLEX 1100 C level meter for liquids and solids in non-explosive environments. The OPTIFLEX 1100 C offers a cost-effective and higher performing replacement for traditional level meters such as RF capacitance, conductive and pressure level meters.
The OPTIFLEX 1100 C is 2-wire, loop-powered and available with a standard 20 m cable or segmented coaxial probe for liquids and a 10 m cable probe for solids. All probes can be shortened on site and commissioning is completed via an intuitive 5-step ”Quick Setup” procedure. The OPTIFLEX 1100 C is available with an integrated display and keypad in the cover so that it is not necessary to open the housing cover for configuration. A blind version is also available. Multiple blind versions can be configured on site, using a single HMI (Human- Machine Interface) service tool.
The OPTIFLEX 1100 C uses TDR (Time Domain Reflectometry) technology. This state-of-the-art technology measures level independent from physical property variations such as dielectric constants, pressure or density. Unlike traditional meters, OPTIFLEX 1100 C does not need any wet calibration, is immune to linearity problems in irregular tank shapes and has neither fragile nor moving parts.
The OPTIFLEX 1100 C is the latest addition to the popular OPTIFLEX product family next to the existing high-precision OPTIFLEX 1300 C TDR level meter, which is used in hazardous environments such as the chemical, oil & gas, and mining industries.
To what extend can a process be expected to perform safely? And in the event of a failure, to what extend can the process be expected to fail safely? These questions are answered through the assignment of a target Safety Integrity Level. SIL ratings measure the safety risk of a given process.
The higher the SIL level, the greater the impact of a failure and the lower the failure rate that is acceptable. Assigning a SIL level is thus based on the amount of risk reduction that is necessary and/or requested to maintain risk at an acceptable level.
To determine SIL in the process industry, one needs to consider the entire control loop. In order to be able to do so each device in this loop needs to have a safe failure fraction, one of the important device factors that needs to be calculated. It will be the total of all these different values that determines the obtained SIL level.
More than thirteen years ago, Magnetrol® (Belgium) was the first to introduce the two- wire guided wave radar to the marketplace. Now Eclipse®
705 has received the exida
certificate for a “SIL 3 Capable” device according to the IEC61508 : 2000 Parts 1-7. This means in practice that combining two devices in a 1oo2 set-up is in line with SIL 3 loop requirements. We like to put emphasis on” loop requirements” since it has to do with an entire installation, not only one device.
In addition to this SIL rating they also have several agency approvals, for example; ATEX, Lloyds, TÜV, and FM/CSA, for Magnetrol’s Eclipse®
705. Reader Reply Card No 121 Reader Reply Card No 120 April / May 2012 •
www.petro-online.com Reader Reply Card No 119
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