Contrec 515 – SC04

Steam Computer - DP Meter (ISO/Cone)

The 515 SC04 application measures the volume, mass and energy content of steam by using single or stacked differential pressure flow inputs in conjunction with a temperature and/or pressure input.

A selection of various modes makes it suitable for many steam applications. Flow is calculated according to equations for ISO 5167 or V-Cone meters and accurately accounts for thermal expension effects.

The energy calculations are based on the IAPWS Industrial Formulation (1997) for the thermodynamic properties of steam. Pressure and temperature values are used to determine the specific volume and enthalpy. The instrument also calculates the isentropic exponent and absolute viscosity which are required for the differential flowrate calculations.

CALCULATIONS

The steam energy calculations are based on the IAPWS Industrial Formulation (1997).

Superheated steam regions are:

0°C < t < 800°C P < 100MPa 32°F < t < 1472°F P < 14500psia 800°C < t < 2000°C P < 10MPa 1472°F < t < 3632°F P < 1450psia Saturated steam regions are: 0°C < t < 374°C (critical temperature) 32°F < t < 705°F P < 22MPa (critical pressure) P < 3190psia Water region is: 0°C < t < t saturation at system pressure 32°C < t < t saturation at system pressure Formulas Volume flow = Mass flow x Specific volume Energy flow = Mass flow x Specific enthalpy