Emerson introduced a high-performance version of its Rosemount 3308 Guided Wave Radar (GWR) Wireless Level Transmitter, which complies with the API 18.2 standard that provides guidance for crude oil custody transfer from small lease tanks.
The transmitter, which is part of Emerson’s Plantweb digital ecosystem portfolio of transformational technologies, software and services, offers enhanced accuracy which can be verified without having to open a tank’s thief hatch, thereby increasing safety.
“The API 18.2 standard places strict accuracy demands on level measurement instrumentation because high levels of uncertainty during custody transfer can have significant financial implications,” said Christoffer Widahl, product management lead with Emerson’s measurement and analytical business. “Measurement precision is therefore essential in these applications, and the enhanced performance of the Rosemount 3308 delivers the high accuracy required to reduce uncertainty and comply with API 18.2.”
An upgraded microwave module has made the Rosemount 3308 more tolerant to difficult process conditions and therefore able to deliver a more sensitive and repeatable measurement and higher accuracy. API 18.2 requires level transmitters to operate with 1/8 inch (3mm) resolution and 3/16 inch (4.7mm) measurement accuracy, which the Rosemount 3308 achieves when set up in high-performance mode. This then enables it to achieve the installed accuracy of 1/4 inch (6.3mm) required to comply with API 18.2. In standard mode, the accuracy of the device has been improved to 1/5 inch (5mm).
Accuracy can be easily verified in just a few minutes using the Rosemount VeriCase mobile verification tool. This straightforward procedure does not require a tank’s thief hatch to be opened or any product to be transferred. Opening the thief hatch can cause high concentrations of hydrocarbon gases and vapors to release, putting worker health at risk, so eliminating this requirement is an important safety improvement.
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