Clamp-on Ultrasonic Gas Flowmeters Have Injected the New Blood into Natural Gas Check-metering and Custody Transfer Application

Transcription

1 Clamp-on Ultrasonic Gas Flowmeters Have Injected the New Blood into Natural Gas Check-metering and Custody Transfer Application Characteristics of Clamp-on Ultrasonic Gas Flowmeter Rocky Zhang Siemens Page 1

2 Table of contents Global acceptance of ultrasonic technology Theory of operation Similarities and differences between Clamp-on ultrasonic gas flowmeters and ultrasonic liquid flowmeter Differences between the field clamp-on and clamp-on spool in check-metering and custody transfer application Benefits of clamp-on ultrasonic gas flowmeter A few unique features of Siemens clamp-on gas flowmeters Short video of Apple App for local and remote meter access for programming and diagnostics Page 2

3 Ultrasonic Flow Measurement Technology Ultrasonic Flowmetering is the Fastest Growing Flow Measurement Technology 9% Relatively New, Proven & Dynamic AGA, API, ISO, ASME, etc. are in place Page 3

4 API issue the standard and Siemens participated in its testing towards the Standard Establishment Page 4

5 AGA Standard with Clamp-on being qualified Page 5

6 Ultrasonic Flow Technology Category Acoustic Measurement Type Transit Time Doppler Installation type Insertion (in-line wetted sensor) Clamp- on Type (externally mounted sensor) Clamp-on Transit Time Signal Transmission Type Wide Beam Shear Mode (Narrow Beam) Page 6

7 First, let s take a look at transit-time theory There is a time difference. Why? A Upstream B Downstream Page 7

8 Ultrasonic Flow Metering Variations A B Page 8

9 Clamp-on Market 2012 Survey by Flow Research Siemens has the No. 1 market share Technology Breakdown Clamp-on Market Restricted Siemens AG Clamp 2014 All market rights reserved. share Source: Page Flow 9 Market Research Study April 2012

10 Shear Mode (Narrow beam) / Wide beam Transmission (Clamp-on) Insert Wave Click for Sample wide Wide Beam beam wide beam Click for Sample Shear Mode Shear Mode Narrow beam Page 10

11 WideBeam Clamp-On Flowmeter WideBeam Convert pipe into transducers and Sees most of the Fluid Flow Profile to provide much more Stable and Repeatable Data Wetted Insert Dual WideBeam Quadruple WideBeam Page 11

12 Clamp-on Technologies - Wide Beam and Narrow Beam transit time WideBeam.html - Page 12

13 Operation of Zero Drift Correction Pipe wall signal path Upstream Transducer Downstream Transducer Signal path Burst of pulses From transducer Arrival of signal through pipe wall Arrival of signal through measured stream Time Operation of Zero Flow Correction Page 13

14 Basic clamp-on system configuration Page 14

15 Differences between ultrasonic gas and liquid measurement Low density (1 Kg/m3 vs Kg/m3 for water) Low gas sound velocity (350 m/s vs m/s for water) Lower refraction angle(7 degree for clamp-on vs. 30 for liquid) High flow velocity (As high as 100 m/s vs. 5 m/s for most liquids) High accuracy requirement (Typically 0.5% or better) Sonic gas signals are harder to inject Otherwise same as liquid such as both using transit time technology Page 15

16 Clamp-On Gas and Gas Properties 80 Gas Molecular Weight vs. Sonic 0 o C (MW reference from CRC handbook) Actual MW (grams/mole) Chlorine Sulfur dioxide Carbon Dioxide Hydrogen Sulfide Oxygen Ethylene Air Curve represents the Flare Gas meter computed MW derived from the measured temperature and sonic velocity. MW = k R T for k = 1.29 (specific heat ratio) Vs 2 R = Gas constant (8314) T = Degrees Kelvin 20 Nitrogen / Carbon Monoxide Ammonia Methane 10 Helium Hydrogen Gas Sonic Velocity Vs (Mps) Page 16

17 Similarity and Difference Between Liquids and Gases Gas has a much lower density and sonic propagation velocity Gas has a lower refraction angle Page 17

18 Similarity and Difference Between Liquids and Gases Gas has a lower sonic impedance and therefore less amplitude Importance of Damping Material Before damping After damping Page 18

19 Dampening Material Removes pipe wall noise and convert its energy from sound to heat Sonic impedance of material is a better match to the pipe wall than the gas Transducer can be mounted on top of the material Improves SNR Page 19

20 Clamp-On Gas and Gas Properties Compressibility factor for Natural Gas Z-Factor C 20 C 40 C 60 C 80 C 100 C Pressure (bara) Q BASE Q ACT P P ACT BASE T T BASE ACT Z Z BASE ACT Page 20

21 FUG1010 compensate for temperature, pressure and gas compressibility using fixed gas compensation Fixed gas composition Page 21

22 Standard Volume and Gas Compressibility Compensation Page 22

23 Clamp-on Flowmeter Benefits Non-Intrusive Technology No Pressure Drop or Energy Loss No need to cut pipe or stop flow except for spool Little to No Maintenance No Moving Parts, No Wear, No Foul, No Cavity No need for sensor cleaning Application: Check metering Custody transfer Portable application Diagnostics: Tell flow direction Tell meter s health and time for calibration and maintenance Page 23

24 Siemens Clamp-on ultrasonic flowmeter Benefits Wide beam technology (highly immune to beam blowing and PCV noise) Patented compensation algorithms to improve accuracy for different upstream pipe configurations Use pipe wall signal to verify the flowmeter s integrity of both hardware and software The signal diagnostic graphics can be viewed from the transmitter which is used as an oscilloscope for diagnostic Apple App Connection to program, download data and diagnose the flowmeter both locally and remotely Wide beam technology is the only technology that can perform the custody transfer accuracy by using externally mounted sensors. Page 24

25 40+ Patent Compensation for upstream conditions Family of Flow Profile Correction Values as a Function of Pipe Configuration 1.05 Region of Depressed Core Flow 1 Flat Flow Profile Profile Correction Multiplier Fully Developed Flow Profile Region of Jet Flow Fully Developed One Two Three Four Five Six Seven Eight Nine Ten (Flat) Eleven (Depressed) Twelve E+01 1.E+02 1.E+03 1.E+04 1.E+05 1.E+06 1.E+07 1.E+08 Copyright: Controlotron 2004 Reynolds Number Compensation for upstream pipe configuration to improve accuracy Page 25

26 Pipe Configuration Compensation Page 26

27 WideBeam benefits: Increased Immunity to Beam Blowing Beam Blowing In case of fluids with very high velocity, the acoustic signal may be blown out of the reception area of the transducer. The shear mode clamp-on transducers are sensitive to beam blowing. The WideBeam transducers are highly immune to beam blowing effects. Page 27

28 INSENSATIVE TO CONTROL VALVE NOISE CV Noise = 100khz - 150khz Insert Meters = 100Khz 200 Khz; WideBeam Meters = 200khz 450khz (most gas applications) Page 28

29 Custody transfer flowmeter with externally mounted transducers Page 29

30 Insert vs Clam-on Sensors Cavity cause local flow disturbance and wetted sensor has built up and contamination potential No Cavity and no sensor cleaning for clamp-on technology Page 30 9/20/2014 For internal use only Page 30

31 Patented Technology One of 5 winners in measurement category Recognized for non-intrusive ultrasonic sensors and 1 st meter of its kind to offer custody transfer accuracy TransLoc mounting system Page 31

32 Siware Diagnostic, Viewing, Reporting, Application Review and Sensor Selection Page 32

33 Si-Ware Diagnostic software Page 33

34 Local and Remote Access to Gas Flowmeter (Siemens SITRANS CONNECTION) Page 34

35 Typical field clamp-on gas flowmeter Page 35

36 Typical Transloc Clamp-on spool with external mounted sensors Page 36

37 Typical gas checkmetering using clamp-on gas flowmeter Page 37

38 Some more field Clamp-on installation- Natural Gas (24 ) Page 38

39 42 Field Clamp-on Gas meter Page 39

40 55 CLAMP-ON GAS METER Page 40

41 4 Beam in Cold Weather Page 41

42 Gas measurement with toxic HCL 10 OD/2.5 WT Page 42

43 Portable check-metering kit Page 43

44 KOGAS Installations with KRISS Calibration Page 44

45 Page 45

46 Test at TransCanada Calibrations 8CS40 Pipe, Dual Beam, Reflect Testing at TCC with flow conditioner ( ) and adjustment; except for the data point at 130 ft/sec ( ), which was out-ofthe-box performance with flow conditioner removed Results of Testing Field Clamp-On System 1010GC vs. Turbine Reference Meter (8CS40 Pipe) 1.50 Deviation (%) (FWME Correction per AGA-9) f/s, w/o Flow Conditioner and nocorrection, as-found datapoint Insert Chordal 5-path failed at about 95 ft/sec! Page ,000 1,500 2,000 2,500 3,000 3,500 4,000 4,500 Flow (m 3 /hr) (Flow Rates >q t )

47 What is SITRANS CONNECTION? Page 47

48 Thank you for your attention! Max Mustermann Function Sector / Region / Department Musterstraße Musterstadt Phone: +49 (1234) Fax: +49 (1234) Cellular: +49 (170) Page 48