Log of external flow meter calibration
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I. Main steps for calibrating the volume tube of the Compact prover (continuously being updated): 1. Drain the residual oil inside the volume tube. Nitrogen is introduced through the top vent to accelerate the emission. About 6-8 hours. 2. Adjust the positions of the 2 eight-character blind flanges at the main flow meter locations on the inlet and outlet pipelines of the volume tube, in order to isolate the end of the volume tube ； Two flanges with gaskets are installed near the inlets and outlets of the volumetric tube pipeline to isolate the volumetric tube assembly. About 1-2 hours. 3. Transfer 600L of diesel into a 1-cubic-meter empty tank, connect an 1-inch hose to the volume tube to form a circulation circuit, and use a small pump with a flow rate of Qmax=45L/min to circulate fluid and clean the inside of the volume tube. About 6-8 hours. 4. Add clean water to the empty tank; still using a 1-inch hose and a small pump with a flow rate of 45 L/min, use clean water to displace the diesel in the volume tube. Clean both chambers on either side of the piston by switching the inlet, until almost all of the liquid displaced is water. About 4-6 hours.
5. Volume tube water level indicator: 1) Clean the water storage tank of the 120L (actually 119.97L) standard volume tank, and remove impurities from the tank walls and bottom； 2) Fill the water tank with clean water, establish a water circulation cycle with the volume tube, and simultaneously remove air from the pipelines ； 3) Check whether the piston movement of the test volumetric tube is smooth without any sticking, and whether the photoelectric switch is functioning properly ； 4) Test whether the water inlet solenoid valve of the standard volume tank is working properly and can operate in sync with the travel photoelectric switch ； 5) Repeatability of the deviation value between the test volume tube and the standard volume tank (119.97 L): The front and rear ends of the volume tube are moved back and forth 3 times each. After each movement, the volume reading on the level gauge is taken and recorded (the difference from the standard volume). The difference between the maximum and minimum values represents the repeatability. Converting each division on the level gauge to 9.997 mL, the repeatability should be within 0.02% of the standard volume for the calibration to be considered successful.