Coriolis gas metering moving into mainstream

Just like the goose and gander, what's good for liquid is good for gas. Long used to accurately measure liquid flow, Coriolis meters now bring similar benefits to gas applications. As a result, Coriolis gas measurement is growing four to five times as fast as liquid applications, according to Fisher-Rosemount's Micro Motion Inc.

11/01/1998


Just like the goose and gander, what's good for liquid is good for gas. Long used to accurately measure liquid flow, Coriolis meters now bring similar benefits to gas applications. As a result, Coriolis gas measurement is growing four to five times as fast as liquid applications, according to Fisher-Rosemount's Micro Motion Inc. (Boulder, Colo.).

No longer a niche technology for special applications, Micro Motion reports that Coriolis gas meters are proving they can deliver accurate measurements, especially under changing conditions and wide turndowns, with no flow conditioning; better reliability due to no moving parts and less needed devices; and lower costs also because of fewer devices, reduced maintenance, and quicker payback from improved accuracy. Coriolis gas meters also require fewer connections and intrusions into process lines, which further cuts costs by preventing leaks and fugitive emissions.

Coriolis gas meters' direct mass measurement ability eliminates the need for former densimeter or pressure-, temperature-, and composition-based measurements. Direct measurement also reduces the chance of process upsets and off-spec product, according to Micro Motion. The company adds that later corrections to standard conditions are also aided because direct mass flow is more accurate than traditional volumetric flow.

Accuracy aids pulp mill

One large, Pacific Northwest-based pulp mill uses Micro Motion's Elite CMF100 Coriolis meter to measure oxygen used to delignify its pulp stock. Chlorine is usually used to bleach pulp stock, but it's dangerous to handle and generates environmentally hazardous dioxins. This makes oxygen delignification more attractive because it removes lignins from pulp fibers without attacking the fibers themselves and greatly reduces chlorine use. "It's a great benefit to have an in-line meter capable of measuring mass flow of oxygen directly and accurately without the need to compensate for pressure and temperature," report the mill's operators.

Micro Motion's Elite Coriolis meters can be used in many other process applications and installed in numerous orientations, including vertical pipe runs. Because the meters are insensitive to orientation and gas swirl effects, straight pipe runs aren't needed. Recalibration for different fluids isn't required, and the factory water calibration transfers to gas measurement. Depending on the application, usable turndown of 100:1 can be achieved, which Micro Motion claims is unprecedented for any gas flow measurement technology.

Micro Motion says its Elite Coriolis meters achieve gas flow accuracies of6NM3/hr.) or 2,500 lb/min. (68,000 kg/hr.) depending on inlet pressure.

In one case, Micro Motion reports several Asian refiners spent years struggling to accurately transfer ethylene gas to chemical users, and had monthly disputes of 2-3% on amounts transferred becasue of volumetric devices. Replacing them with Elite flow meters reduced transfer variance to 0.3%, which settled the dispute and also cut maintenance costs.

For more information, visit www.controleng.com/info .





No comments
The Engineers' Choice Awards highlight some of the best new control, instrumentation and automation products as chosen by...
The System Integrator Giants program lists the top 100 system integrators among companies listed in CFE Media's Global System Integrator Database.
The Engineering Leaders Under 40 program identifies and gives recognition to young engineers who...
This eGuide illustrates solutions, applications and benefits of machine vision systems.
Learn how to increase device reliability in harsh environments and decrease unplanned system downtime.
This eGuide contains a series of articles and videos that considers theoretical and practical; immediate needs and a look into the future.
Sensor-to-cloud interoperability; PID and digital control efficiency; Alarm management system design; Automotive industry advances
Make Big Data and Industrial Internet of Things work for you, 2017 Engineers' Choice Finalists, Avoid control design pitfalls, Managing IIoT processes
Engineering Leaders Under 40; System integration improving packaging operation; Process sensing; PID velocity; Cybersecurity and functional safety
This article collection contains several articles on the Industrial Internet of Things (IIoT) and how it is transforming manufacturing.

Find and connect with the most suitable service provider for your unique application. Start searching the Global System Integrator Database Now!

SCADA at the junction, Managing risk through maintenance, Moving at the speed of data
Flexible offshore fire protection; Big Data's impact on operations; Bridging the skills gap; Identifying security risks
The digital oilfield: Utilizing Big Data can yield big savings; Virtualization a real solution; Tracking SIS performance
click me