Byong Guk Jeon, Ho Sik Kim NQe 401 Exp. 3 Flow measurement

QUIZ 1. What is difference between absolute pressure and gauge pressure? (in atm) 2. What is the name of tube used for pressure measurement? 3. Where are pressure transmitters located in the primary side of NPP?

From time immemorial the measurement of fluid flow has been a mark of civilization. Egyptians depended strongly on the indications of Nile meter for predicting fertility of their lands. Romans equipped their pipe systems through the city and measured flow rate by orifice Nowadays, a lot of handy and delicate flow measuring devices are available Introduction

Gravity – Buoyancy= Pressure drop due to flow Since gravity and buoyancy force is constant. Pressure drop due to flow rate determines the location of the float Global flow measurement: Rotameter

- Uses differential pressure. Types of flow meters: Pitot tube

This equation provides the relation between pressure and velocity. Underlying theory: Bernoulli's equation

For incompressible flow, the volumetric flow rate is.. Global flow measurement: Orifice

 In the secondary system of PWRs, the venture flow sensors suffer fouling problem erroneously indicating high feed water flow. It can cost a plant nearly 3 percent of power output. Because of this problem, many plants have installed ultrasonic flow sensors.  For this 3 percent gain in plant power output, plants must pay about $2 million (in 2006) to implement an ultrasonic flow sensor. Ultrasonic flow meter

Vortex flowmeter

Overall comparison on flow meters

Purpose: Get flow thickness Procedure: 1) Open the water/air valve and make a flow at various flow rates 2) Measure flow thickness/ flow characteristic (steady/ unsteady) 3) Close the water/air valve Experiment Schedule Air flow rate (LPM) Water flow rate (LPM)