Cutting the cost of an orifice meter installation
14 November 2009
A conventional orifice flowmeter installation can have over 25 separate components, each presenting one or more potential leakage paths.
ABB's online calculator for orifice flowmeters
In comparison, the new OriMaster features an integrated DP transmitter and manifold design. Tony Hoyle, ABB’s UK Flow Products Manager, says that by eliminating up to 80% of the potential leak points, it greatly reduces both fugitive emissions and also the metering errors caused by such leakage.
As a sales tool to convince potential customers, ABB has created an online calculator to show how the new orifice flowmeter can help plant operators cut cost compared to conventional, flowmeter technologies.
The online calculator enables users to select a choice of pipe diameter sizes and set the number of orifice flowmeter installations at their plant. The calculator then compares a conventional orifice hook-up, half-inch schedule 80 impulse pipe installation against the OriMaster to calculate both the reduction in the number of leakage paths and the overall cost saving through the consequent reduction in components.
"The calculator provides a convincing case," says Mr. Hoyle, who hopes potential customers will agree.
"Taking a single flowmeter on a 50mm pipe, for example, an operator could cut their installation cost by over 35% compared to a conventional installation, with a reduction in leakage paths from 30 down to just seven.”
ABB's latest: the OriMaster
The latest in ABB’s new FlowMaster range, the OriMaster comes fully factory configured and pressure tested, which Mr. Hoyle says will solve many of the problems associated with sizing, selection, installation, and operation of conventional orifice plate installations.
It combines all the major components needed for an orifice plate installation in one assembly.
This eliminates the need for users to design, source and install a separate manifold, transmitter and impulse piping.
"There is no need for separate impulse lines so you get safer, more efficient flow metering while minimising the potential for dangerous fugitive emissions and securing plant safety and control," he says.
The all-in-one design offers enhanced accuracy and a faster speed of response, with no problems caused by issues such as long or blocked impulse lines, or impaired signals due to condensation in gas system impulse lines or gas bubbles in liquid lines.
It is suitable for clean liquids, gases, and steam applications in line sizes from one to eight inches, or DN25 to DN200 and at pressures up to 100 bar.
Installing the instrument is simplified by its wafer design orifice carrier assembly, enabling it to be fitted into an existing space between standard pipe flanges with minimal disruption to the surrounding pipework.
Additionally, the unit’s centralisation tool improves accuracy and confidence that the installation is correct . These all make it ideal for Maintenance, Repair and Overhaul (MRO) applications, by enabling fast and simple replacement with no cutting or welding required.
For more information about the OriMaster flowmeter, visit www.abb.com/flow.
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