Evaluating New Generation Vibrating Tube Sensor for Density Measurement under Process Conditions

Transcription

1 Products Solutions Services Evaluating New Generation Vibrating Tube Sensor for Density Measurement under Process Conditions Dr. Alfred Rieder, Slide 1

2 Overview Introduction Process meter Features Working principle Sensitivity and accuracy Third party test results H&D Fitzgerald / UK TUV NEL / UK Wrap-Up Slide 2

3 Introduction to density measurement Additionally to mass flow rate, multi-variable Coriolis mass flow meters also determine temperature and density Precise temperature and density measurement performance under real world process conditions is complex, but important for : Volumetric custody transfer Meter proving in the Oil & Gas industry Generally density is a key indicator of the process fluid quality in all industries Slide 3

4 Process Meter - Features Coriolis mass flow meter Proline 300/500 Promass Q Four different line sizes from 1 to 4 Process temperature range C Process pressure range bar Secondary safety containment Slide 4

5 Process Meter - Specification Mass flow: ± 0.05 % o. r. Density: ± 0.2 kg/m³ Temperature: ± 0.1 C 6 years of development time virtual prototypes 15 implemented patents Slide 5

6 Process Meter Working Principle Both tubes vibrate in opposite directions so system is balanced Equivalent to a tuning fork energy is conserved in oscillator Fluid density is derived from raw resonance frequency f r f = f r (p, v, γ) ρ r = C 0 (T m ) + C 1 T m, T h ρ = ρ r (η, c) f 2 Slide 6

7 Process Meter Working Principle f = f r (p, v, γ) ρ r = C 0 (T m ) + C 1 T m, T h ρ = ρ r (η, c) f 2 Compensation of pressure (external input), flow velocity, installation angle, gravity, fluid temperature, ambient temperature, viscosity and sound speed (entrained gas) Calibration of C 0, C 1, with air, water and water at high temperature Slide 7

8 Sensitivity and accuracy: Process pressure p Optimized tube shape and braces Small residuum kg/m³/bar Repeatable and linear sensitivity Structural simulation: Slide 8

9 Sensitivity and accuracy: Flow velocity v Flow velocity v generates centrifugal force Stiffening effect of tube is compensated Slide 9

10 Sensitivity and accuracy: Meter orientation Effect depending on meter orientation with respect to the earth s gravity Tube mass give rise to tension or compression along straight measuring tube segments Changing resonance frequency and density reading Automatic compensation by giving installation Pitch- and Roll angle Slide 10

11 Sensitivity and accuracy: Forces and vibrations Tube shape and housing stiffness optimized Overall meter size and weight still compact and light Moderate working frequency offers immunity against the influence of external vibrations which are typically at low frequencies Structural simulation: Slide 11

12 Sensitivity and accuracy: Fluid temperature T m Compensate Young's Modulus Two PT1000 at inlet and outlet Over a CFD simulations for optimally placed sensors Very low gradient ± kg/m3/ C To provide redundancy Slide 12

13 Process Meter Working Principle Due to low working frequency sound speed effect is negligible with single phases Entrained gas in liquid rises compressibility and decreases sound speed of the mixture significantly Higher compressibility increases mixture amplitude and thus causes positive density deviation Using simultaneously driven higher order mode, error compensation called MFT is implemented 1 st mode Disturbed measurement 2 nd mode Correction information Corrected measurement Slide 13

14 The test results of Promass Q H&D Fitzgerald Ltd.: Density Metrologists TüV Nel - TUV SUD Ltd. Slide 14

15 Third party test results H&D Fitzgerald / UK Linearity across fluid density All 4 line sizes tested with 13 different fluids at 25 C Densities of air and liquids from 745 kg/m³ to 1612 kg/m³ UKAS certificate issued by H&D Fitzgerald Ltd. Slide 15

16 Third party test results H&D Fitzgerald / UK Compensated viscosity effect All 4 line sizes tested with 13 different fluids at 25 C Viscosities up to 2885 mpa s UKAS certificate issued by H&D Fitzgerald Ltd. Slide 16

17 Third party test results TUV NEL / UK Temperature deviation across temperature, ambient temperature as a parameter NEL/UK density chamber Ambient temperature Slide 17

18 Third party test results TUV NEL / UK Deviation of fluid temperature across fluid temperature, fluid pressure as a parameter NEL/UK density chamber Slide 18

19 Third party test results TUV NEL / UK Deviation of measured water density across fluid temperature, fluid pressure as a parameter Fluid temperature equal to ambient temperature Fluid pressure Slide 19

20 Third party test results TUV NEL / UK Deviation of measured iso-butanol density across fluid temperature, fluid pressure as a parameter Fluid temperature equal to ambient temperature Fluid pressure Slide 20

21 Third party test results TUV NEL / UK Measured water density deviation across fluid temperature, ambient temperature as a parameter Ambient temperature Slide 21

22 Third party test results TUV NEL / UK 2 nd test of the same meter at TUV NEL 6 month later Excellent repeatability and long term stability Dr. Norman Glen - Principal Consultant / TUV NEL: Overall, the meter performance is excellent, with good absolute density performance and good repeatability May 2017 October 2017 Slide 22

23 Wrap-Up A new type of Coriolis mass flowmeter has been presented The meter third party tests results confirmed the temperature and density specifications of ±0.1 C and ±0.2 kg/m³ respectively across a broad range of process parameters, fluid properties as well as environmental and installation conditions Test results provide confidence in the meter design and ability to provide unequalled density measurement performance for key applications as found in industry Slide 23

24 Questions? Slide 24