THE LARGE WATERFLOW LABORATORY- A NEW FACILITY FOR CALIBRATING LARGE SIZE FLOWMETERS
G.Sundaravadivel, Dr.Jacob Chandapillai, A.S.Murali
CALIBRATION OF LARGE SIZE FLOW PRODUCTS
LIMITATIONS OF INDIRECT METODES
Scaled down model study By-pass flow metering technique Insertion flow meters Calibrating higher size flowmeter in a smaller size calibration rig. Velocity vs error curve
Specifications The
major specifications when the NABL and the market requirements are merged
Flow Medium Maximum discharge Pipe Line Size
Maximum velocity
Maximum Line Size Possible Sump Dimensions Type of Flow Pumps Head Type of Drive Power Uncertainty
:Water :15000 m3/hr :2000mm (Design) & Ready to Use 1200mm :1.4m/s. in 2000mm dia. & 3.4 m/s. in 1200mm dia :3000mm :50m (L)x 8 m (W) x 7.5 m (D) :Direct Pumping :Vertical turbine 5 numbers :20m of Water Column :Electrical Motor, Slip ring type :DG Sets, 1250 KVA 2 Nos :+/- 0.5%
SUMP
PUMP HOUSE
POWER HOUSE
REFERENCE FLOWMETERS
TEST LINE
TRACEABILITY OF MEASUREMENTS
FLOWRATE(REF.FLOWMETERS) TRACEABLE TO WFL,FCRI STATIC WEIGHING METHOD MASS---WORKING STD. AT PSL,FCRI---NPL TIME---WORKING STD.AT ETL,FCRI---NPL TEMP.---WORKING STD.AT ETL,FCRI---NPL
DIFFL.PR.--- WORKING STD.A STROKE (LENGTH)--- WORKING STD. AT PSL,FCRI---NPL
OVERALL UNCERTAINTY IN FLOWRATE MEASUREMENT IS BETTER THAN +/-0.5%
CALIBRATION OF FLOWMETERS AT LWFL
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