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Division 3.4.2 Calibration of a positive displacement pump (PDP)

Original text. Later amendments are not shown.

Figure A5/6

PDP calibration configuration

where:

V0

  • is the pump flow rate at Tp and Pp, m3/rev;

    • Qs

  • is the air flow at 101,325 kPa and 273,15 K (0 °C), m3/min;

    • Tp

  • is the pump inlet temperature, Kelvin (K);

    • Pp

  • is the absolute pump inlet pressure, kPa;

    • n

  • is the pump speed, min–1.

    • where:

    x0

  • is the correlation function;

    • ΔPp

  • is the pressure differential from pump inlet to pump outlet, kPa;

    • Pe

  • absolute outlet pressure (PPO + Pb), kPa.

    • A linear least squares fit shall be performed to generate the calibration equations having the following form:

    V0=D0− M× x0
    n=A− B× ΔPp

    where B and M are the slopes, and A and D0 are the intercepts of the lines.

    1. 3.4.2.1Division 3.4.2.1
    2. 3.4.2.2This calibration procedure is based on the measurement of the absolute values of the pump and flow meter parameters relating the flow rate at each point. The following conditions shall be maintained to ensure the accuracy and integrity of the calibration curve:
    3. 3.4.2.3Division 3.4.2.3
    4. 3.4.2.4Figure A5/6 of this Sub-Annex shows an example of a calibration set-up. Variations are permissible, provided that the approval authority approves them as being of comparable accuracy. If the set-up shown in Figure A5/6 is used, the following data shall be found within the limits of accuracy given:
    5. 3.4.2.5Division 3.4.2.5
    6. 3.4.2.5.1Division 3.4.2.5.1
    7. 3.4.2.5.2Division 3.4.2.5.2
    8. 3.4.2.5.3The air flow rate shall be subsequently converted to pump flow V0 in m3/rev at absolute pump inlet temperature and pressure.
    9. 3.4.2.5.4To compensate for the interaction of pump speed pressure variations at the pump and the pump slip rate, the correlation function x0 between the pump speed n, the pressure differential from pump inlet to pump outlet and the absolute pump outlet pressure shall be calculated using the following equation:
    10. 3.4.2.6Division 3.4.2.6
    11. 3.4.2.7Division 3.4.2.7