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Pitot tube deltaflow - an engineering approach systec Controls Meß- und Regeltechnik GmbH

Pitot tube deltaflow - an engineering approach systec Controls Meß- und Regeltechnik GmbH Sebastian Fischer Sales Manager. Agenda. Design your deltaflow Select your deltaflow, deltaflow types, calculation software deltacalc, Mounting, Required Parameters, dp-connection, opposite support

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Pitot tube deltaflow - an engineering approach systec Controls Meß- und Regeltechnik GmbH

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  1. Pitot tube deltaflow - an engineering approach systec Controls Meß- und Regeltechnik GmbH Sebastian Fischer Sales Manager

  2. Agenda Design your deltaflowSelect your deltaflow, deltaflow types, calculation software deltacalc, Mounting, Required Parameters, dp-connection, opposite support Bidirectional Measurement Splitting Range How to handle polluted media - Air purging system LSP deltaflow for high-pressure applications – DF25HDD3 How to calibrate your deltaflow Straight run requirements Using integrated temperature & pressure measurement

  3. Chapter 1 - Design your deltaflow • This chapter contains: • What deltaflow types are available? • What parameters do I have to know? • What minimum dp should I have for reliable measurement? • How can I handle low flows? • How can I handle big measurement ranges (span)? • How does a bi-directional measurement look like?

  4. Design your deltaflow – deltaflow series DF8 DF12 DF25 DF25HDD3 DF25 Quicklok DF44

  5. Design your deltaflow – deltaflow types What process connections / types are available?

  6. Design your deltaflow – deltaflow types Flange-type Cut-Ring Type

  7. Design your deltaflow – deltaflow types Spool Piece Weld-in (DF25HDD3) Weld-in (DF12)

  8. Design your deltaflow – deltaflow types DF8 – spool piece (block) with integrated orifice DF25 Quick-lock system allows mounting/extraction under pressurized conditions (max. 100bar)

  9. deltaflow types - Summary Note: Spool Pieces are available with welding ends or flanges

  10. Design your deltaflow – required parameters (1) dp-connection Stud (e.g. cut ring or flange) • Profile crosses whole diameter -> length customized to application • Internal Diameter ID • Wall thickness WT • Thickness of isolation IT • are required Insulation IT WT ID Profile

  11. Neck Profile Design your deltaflow – required parameters (2) • In most cases neck and parts outside of the pipe can be made of standard SS316 (1.4571) also when profile is made of special material • Material of weld-in stud should be equal or similar to pipe material

  12. Design your deltaflow – required parameters (3) • Pipe Data • Wall thickness • Internal Diameter • Pipe Material • Orientation of Pipe (horizontal or vertical • Process • Flow • Temperature • Pressure

  13. Calculate (design) your deltaflow – calculation software deltacalc ? ..\..\..\..\Program Files\deltacalc 7\deltacalc7PRO.exe

  14. How can I connect my deltaflow with my dp-transmitter ?

  15. Design your deltaflow - Mounting of dp-transmitter Direct Mounting Remote Mounting

  16. dp-Connection - 3-way-manifold direct + Easy setting of zero point by using by-pass+ Shut-off of media (e.g. allows remove of transmitter)+ high pressure / temperature (PN400) - Smaller internal piping -> not recommended for wet gases

  17. dp-Connection – Ball Valves Direct Remote + Shut-off of media (e.g. allows remove of transmitter) possible + big opening -> recommended for wet/dirty gases (e.g. Biogas) + Available with threads, welding ends, oval adapters, fittings (ermeto,..) - Limited concerning Temperature/Pressure (70bar at 35°C, 2 bar at 200°C)

  18. dp-Connection – Shut-off valves • Needle (shut-off) Valves (normally for remote installation of transmitter) • Double (see pic.) and single valves available • Available with welding ends, thread, Ermeto, Swagelok. Customized connections possible + Shut-off of media (e.g. allows remove of transmitter) + big opening + High pressure/temperature (PN400)

  19. dp-Connection – Miscellaneous Fitting (e.g. Ermeto) for remote mounting Welding Ends for remote mounting Oval Adapter (direct mounting)(acc. to EN61518) Ball Valve with fitting (e.g. Ermeto) for remote mounting

  20. dp-Connection – Miscellaneous (2) Weather Protection Box + provides heating and protection for electrical equipment (transmitters)+ Can be mounted remotley or direct on deltaflow‘s flange

  21. dp-Connection – Summary • Various possibilities of connections of dp-transmitters are available • Possibility to shut-off connection to media (valves) is recommended • If not specified by customer we recommend 3-way-manifold or ball valve (wet / dirty gases) for standard applications • When using high-pressure equipment double valves are recommended

  22. How should I mount my deltaflow?

  23. Mounting – Liquid Service • Mounting should allow gas bubbles to vent off • When installed sidewards probe should be slightly slanted (-3…0°)

  24. Mounting – Gas Service • Mounting should allow condensate to drain back into pipe • (Otherwise condensate might accumulate in internal piping and generate water column (which generates faulty dp)) • When installed sidewards probe should be slightly slanted (0..3°)

  25. Mounting – Steam Service • Condensate is used to transmit dp to transmitter • Mounting should allow excessive condensate to drain back into pipe • When installed sidewards probe should be slightly slanted (0..3°)

  26. Design your deltaflow – Required dp • deltaflow requires a minimum differential pressure to ensure reliable measurement: • As rule of thumb you should have at least: • Gases / Liquids: >0.2mbar @ Qmin • Steam: >5mbar (steam applications are more sensitive against misinstallation than gas / liquids) @ Qmin • dp‘s can be calculated for each application by using deltacalc software

  27. Design your deltaflow – required dp • How can I handle low flows? • Sometimes velocity is too low to provide sufficient dp values • Spool Pieces with reduction can be used to speed up media Widening (e.g. DN65/DN100 Reduction (e.g. DN100/DN65) By using spool pieces with reduction deltaflow can serve also typical low flow applications (e.g. Biogas)

  28. Design your deltaflow – opposite support What‘s about the mechanical stability of deltaflow? When do I need an opposite support ?

  29. Opposite Support - Background • Probe has a specific resonance frequency (RF) depending on length and width of probe • Flow generates Vortex („turbulence“) with a specific frequency (VF) at probe depending on velocity and width of probe („probe is stimulated“) [RF and VF are mentioned at deltacalc calculation protocol] • If Vortex frequency = resonance frequency (or multiple) probe might resonate and might break! • To ensure mechanical stability an opposite support might be required Vortex

  30. Frequency calculation without opposite support RF = Resonance Frequency of Probe / VF=Vortex Frequency Saftey Factor SF = RF/VF SF should be >= 1.3 to ensure mechanical stability

  31. Frequency calculation with opposite support Opposite Support quadruples Resonance Frequency and Saftey! The bigger the profile the higher the resonance frequency

  32. Opposite Support – Examples DF25 prepared for use with (upper) and without (lower) opposite support High-pressure probe withopposite support

  33. Opposite Support – Summary / Design Rules • Opposite Support Required if: • Pipe Size >= DN1000 • dp >= 20mbar and RF/VF <= 1.3 • High-pressure probe • Check (if required or not) is done automatically by deltacalc (except because of size!)

  34. Chapter 2 – Splitting Range Measurement How can I handle big measurement ranges?

  35. Splitting range • deltaflow offers a span of typically 1 to 7..10 • 1 to 10 in flow means 1 to 100 (!) in dp • How does that influence my measurement? • Example: dp_min = 2mbar / dp_max = 240mbarspan dp-transmitter: 250mbar, uncertainty 0.1% (=0.25mbar) • 0.25mbar at 2mbar means relative uncertainty of 12.5% • With splitting range. e.g: • Transmitter: 0…20mbar • Transmitter: 20…240mbar

  36. Design your deltaflow – splitting range How can I realize a splitting range measurement? • You need two (or more) (stacked) transmitters • You need evaluation unit (e.g. flowcom or PCS) which decides which transmitter should be used (depending on dp) Connectors („T-bone“)

  37. Splitting range - summary • With splitting range up to 4 dp-transmitters can be used • Span of 1..30 and more can be realized(pay attention to mechanical stability)

  38. Chapter 3 – Bi-directional Measurement

  39. Bi-directional measurement • Thanks to symetrical profile deltaflow can measure bidirectional • Each direction requires it‘s own transmitter(s) • Flowcom (or PCS) controls measurement Flow (splitting range) Back Flow (splitting range)

  40. Chapter 4 – Air purging When do I need an air purging system (LSP)

  41. Air purging system LSP • Highly Polluted media might clog deltaflow‘s dp-tappings • When dust-load >=50mg/m3 automatical cleaning is required • systec offers automatic air purging system LSP for periodical cleaning • LSP blows pressurized air into deltaflow pressure chambers

  42. Air purging system LSP - Principle dp-transmitter can be mounted directly on LSP by using mounting plate Valves: When purging connection to dp-transmitter is closed and connection to pressurized air is open Connections for dp-impulse pipes (Ermeto, others on request) Purging is controlled by SPS. Frequency of purging as well as length of purging can be set by user Connection for pressurized air (max. 6bar)

  43. Air purging system LSP - Example deltaflow DF50 (old style), flange type Shut-off (ball valves) Connected by impulse piping LSP with mounted dp-transmitter

  44. Air purging system LSP - Summary • With LSP measurements at high degrees of pollution (up to 200 g/m3 (!)) become possible • During purging dp is hydraulically locked -> no lost of dp-signal during purging • Option „Signal holding“ available. Here, last value of dp before purging is holded electronically by SPS • Direct mounting of dp-transmitter possible (on top of LSP) • Pressurized Air required on site (max. 6 bar) • Impulse piping required (LSP - deltaflow)

  45. Chapter 5 – deltaflow for high-pressure applications When do I need a high-pressure probe and what‘s about it ?

  46. High pressure probe When do I need high pressure probe? • Limits for standard DF25: PN160 (steam), PN250 (Liquids) • Finally, it has to be determined by customer, but there are indications when to use high-pressure probe: • When weld-in probe is required (e.g. sealings are not accepted) • When pipe is made of high grade material (e.g. P91, 10CrMo 9 10))

  47. High pressure probe For high pressure applications a special version of the DF25 (DF25HDD3) is available Condensate Pots (for steam only) • Profile made of massive block (no welding seams) • Material of Profile: 1.4828 • Materials of weld-in parts:16Mo3, 10CrMo 9 10, P91 • Material of valves:16Mo3, 10CrMo 9 10 • opposite support always required Weld-in part („neck) Double valves Profile

  48. High pressure probe - Examples - Steam, 540°C, 100bar - Profile: 1.4828- Weld-in part: 10 CrMo9 10- Condensate Pots:10 CroMo 9 10 (=1.7380) - Steam, 535°C, 190bar - spool piece- Profile: 1.4828- Weld-in part: P91- Condensate Pots: P91

  49. High pressure probe – Required certificates / testings Requirements are regulated by PED97/23/EG

  50. Chapter 6 – Calibration

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