大口径配管における湿り蒸気中でのクランプオン型超音波流量計の指示値特性の評価

抄録

The act of evaluating steam flow rate at demand end is significant in the point of view of energy management since the steam is widely used to thermal energy supply in the industrial fields. The steam state of the practical steam piping of the factories can be a wet steam as a consequence of heat loss, heat supply, work, and so forth. It is well known that the steam wetness sometimes causes measurement errors of steam flow meter. However, there has been no established standard for estimating the measurement error since it is hard to evaluate the effects of the steam wetness quantitatively in plants and factories. A clamp-on type ultrasonic steam flow meter now under development is useful for the factory since it is unnecessary to pipe processing. We have performed the steam flow test with this clamp-on type ultrasonic flow meter and found some characteristics of the indicated value of flow rate. This paper introduces evaluation of the characteristics of the measured flow rate by the clamp-on type ultrasonic flow meter under the wet steam flow in the large-bore piping than our previous studies.