Measurement is the eye of industrial production. Flow measurement is one of the components of measurement science and technology. It is closely related to national economy, national defense construction and scientific research. Doing this work well plays an important role in ensuring product quality, improving production efficiency and promoting the development of science and technology. Especially in today's era of energy crisis and increasing automation of industrial production, the position and role of flowmeter in the national economy are more obvious.
The commonly used unit in engineering is m3 / h, which can be divided into instantaneous flow rate and total flow. Instantaneous flow refers to the amount passing through the effective section of closed pipeline or open channel in unit time, and the substances flowing through can be gas, liquid and solid; Cumulative flow refers to the cumulative amount of fluid flowing through the effective section of closed pipeline or open channel in a certain time interval (one day, one week, one month, one year). The cumulative flow can also be obtained by integrating the instantaneous flow with time, so the instantaneous flowmeter and cumulative flowmeter can also be transformed into each other.
» CJ / T122-2000 ultrasonic Doppler flowmeter Ministry of construction
» CJ / t3017-1993 submersible electromagnetic flowmeter Ministry of construction
» CJ / t3054.1-1995 water metering instrument averaging tube flowmeter Ministry of construction
» CJ / t3063-1997 ultrasonic flowmeter for water supply and drainage (propagation velocity difference method) Ministry of construction
Guidelines for calculation of ampacity of wound cables for Mobile Equipment State Bureau of technical supervision