Email Document Reference

Enter your email address below and the reference for this document will be sent to shortly from webmaster@ceesi.com.

Title: CLAMP-ON ULTRASONIC FLOW METER APPLICATION AND PERFORMANCE
Author: WILLIAM E. FRASIER CASEY HODGES JOE NETTLETON
Source: 2017 American School of Gas Measurement Technology
Year Published: 2017
Abstract: Clamp-on meters are specified to achieve one to three per cent uncertainty. Manufacturers cannot control the quality of a given field installation and must provide latitude. Lab testing has demonstrated many installations perform at an accuracy level range of 1%. If a reliable installation technique is maintained, the clamp-on meter will often perform better than manufacturer standards. Further, the meter control units have piecewise linear error correction schemes such that they can be adjusted to reference flow rates as afforded at a flow lab. Clamp-on repeatability is very precise. Often the exact flow volume is not as important as repeatable data before and after an experimental change such as a meter cleaning. Changes as small as 0.1% can be detected. There is a learning curve or experience effect. New users may have no confidence in the clamp-on technology. Training helps and repeated installation in known settings aids user confidence. Clamping on at a flow lab where flow rate is known is helpful. In fact, a useful application is clamping on a custody meter as it is flow calibrated at a lab and collect clamp-on data at the same time. The clamp-on meter can later be installed in the field setting and compared to the custody meter to identify relationship shifts between the two meters as found at the flow lab.

In order to prevent spam and automated file downloads for documents within the Measurement Library, please follow the instructions below and then you will be able to email a reference to this article.