The Fluid Flow Measurement Standard group of NPLI has Water Meter Testing and Calibration Facilities. The group has Testing Facility upto 50 mm and Calibration Facility upto 200 mm. Presently, the group is providing testing services of the water flow meters as per IS 779, IS 6784 and ISO 4064 to the various user organizations traceable to the ‘National Standard’. The upgradation of old Calibration Facility using state-of-the-art instrumentation and control has been planned to make it comparable to advanced NMIs and provide traceable measurements to Indian users.
As a follow up of the upgradation, a new prototype automatic Water Flow Calibration Standard (i.e. primary standard) of size DN100 has been designed and fabricated. The different parts of the prototype system i.e. weighing tanks, load cells, flow control valves, drain valves, flowmeters, On/Off valves, diverter, fishtail, pneumatic pipes, pressure regulator devices, pressure gauges, temperature sensors etc. have been installed and integrated. The automation of load cells indicators, flowmeters, diverter and drain valves has been completed. The software development for error and uncertainty estimation is in progress. Figure 1 shows the photographs of different parts of this system.
Shiv Kumar Jaiswal
Fluid Flow Measurement Standard
Room No. 22, HEPP Building
(a) New DN100 Rig along with DN50 and DN200
(b) Piping, Weighing Tanks and Support Structures
(c) Weighing Tank, Drain Valve and Platform for Calibration of Tank
(d) Flowmeters, flow control valve and current source (4-20 mA)
(e) Circuit for automation of diverter and drain valves
Figure 1: Photographs of New Water Flow Calibration System of size DN100.