1. Introduction of Liquid Flow Standards Section Fluid Flow Division National Metrology Institute of Japan (NMIJ)

2. Water Flow Facility

3. Overview of water calibration facility I - Bird’s-eye view
Overflow Head Tank
Feed Pumps
Circulation Pumps
Control Bldg.
Working Standard Flowmeters
Testing Bldg.
Calibration Bldg.
Prover Bldg.
5t, 500kg Weighing Tank Bldg.
Small Water Calibration Rig
50t Weighing Tank Bldg.

4. Hydrocarbon Flow Facility

5. Hydrocarbon Flow (Large)
Kerosene
Light oil
Storage Tank
（Light Oil；43m3）
Storage tank
（Kerosene；43m3）
Heat exchanger
Diverter/
Weighing Tank/
Balance
Servo PD meter
SVP
Test line
Pump
Chiller Unit
the fluctuation of temperature for 10 min. is less than 0.03 ºC

6. Flow Calibration Services at NMIJ
Water Flow
Size
Facility
Calibration Range
BMC (k = 2)
Small
10 kg Weighing Tank
0.002 m3/h to 1.2 m3/h
0.039 %
Large and Medium
500 kg, 5 t and 50 t Weighing Tanks
with Constant Head Tank
0.3 m3/h to 3000 m3/h
0.042 % to
0.060 %
Super-Large
Reference meters
Ball prover
750 m3/h to m3/h
at 70 C
0.081 %
Hydrocarbon Flow (Kerosene and Light oil)
Facility
Calibration Range
BMC (k = 2)
Small
2 kg Weighing Tank
0.01 m3/h to 0.1 m3/h
0.03 % (mass)
0.06%(volume)
Middle
32 kg Weighing Tank
0.1 m3/h to 15 m3/h
0.02 % (mass)
0.03%(volume)
Large
10 t and 1t Weighing Tanks
3 to 300 m3/h 6