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Bjørge Solberg & Andersen KONTROLL VENTILER JAN O HJETLAND.

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Presentasjon om: "Bjørge Solberg & Andersen KONTROLL VENTILER JAN O HJETLAND."— Utskrift av presentasjonen:

1 Bjørge Solberg & Andersen KONTROLL VENTILER JAN O HJETLAND

2 Bjørge Solberg & Andersen Fag disipliner Prosess Material Instrument ”Piping” Maling Innkjøp Produksjons oppfølging

3 Bjørge Solberg & Andersen Sete ventil (Globe) Kule ventil (Bal) Sving ventil (Butterfly) Hvilken type kontroll ventiler har vi

4 Bjørge Solberg & Andersen Hva er en kontroll ventil En kontroll ventil er arbeideren i en prosess lup

5 Bjørge Solberg & Andersen

6 Bjørge Solberg & Andersen BUTTERFLY

7 Bjørge Solberg & Andersen Ball

8 Bjørge Solberg & Andersen Globe

9 Bjørge Solberg & Andersen CAGE

10 Bjørge Solberg & Andersen Separator Level Control LC Oil Water Oil Gas Oil level Control valve Water level Control valve Gas outlet Crude Inlet from well head

11 Bjørge Solberg & Andersen Ventildimensjonering og valg - fremgangsmåte 1) Beregning av ventilstørrelse2) Beregning av støy / andre forhold 3) Valg av ventiltype - gjenta fra 14) Valg av materialer / pakkboks 5) Beregning og valg av aktuator6) Tilleggsutstyr / endelig beskrivelse Gjenta beregningene med relevante ventildata

12 Bjørge Solberg & Andersen KURVE

13 Bjørge Solberg & Andersen

14 Beregne ventilstørrelse - bakgrunn Har stort sett vært basert på leverandørenes egne standarder / metoder Standardiseringsarbeide har pågått siden tidlig 1960 ISA etablerte en komite i 1967 som skulle utvikle og distribuere standard ligningssett - ble til en “American National Standard” IEC benyttet ISAarbeidet som basis for å formulere internasjonale standarder ISA og IEC standardene er harmonisert, med noen få unntak (nomenklatur) ANSI / ISA Standard betegnes S75.01 IEC standard har betegnelsen og (inkompressible og kompressible medier) Disse standardene inneholder også metodikk for støyberegninger 1) Beregning av ventilstørrelse2) Beregning av støy / andre forhold 3) Valg av ventiltype - gjenta fra 14) Valg av materialer / pakkboks 5) Beregning og valg av aktuator 6) Tilleggsutstyr / endelig beskrivelse

15 Bjørge Solberg & Andersen Støy i reguleringsventiler Støy i reguleringsventiler er en stor bidragsyter til anleggets totale bakgrunnsstøy Myndighets krav blir stadig strengere Støykilder i et anlegg er vanskelige å identifisere, p.g.a. mange forskjellige kilder, refleksjoner, forplantning av støy etc. Brukere som ser bort fra støykravene er eksponert for unødvendige belastninger Kontraktører som garanterer å møte spesifikasjoner for støy er eksponert for potensielle erstatningssaker / kostnader ved korreksjoner

16 Bjørge Solberg & Andersen Aerodynamiske støykilder

17 Bjørge Solberg & Andersen Linje-kilde R LpA = F + 10 Log 1 + r R + r Tverrsnitt av rør For hver dobling av avstand, tapes 3 dBa

18 Bjørge Solberg & Andersen Noise Trims - Whisper I Splits flow into small rectangular passages Increases Peak Frequency Complimentary body design Most effective dP/P1 <0.6 Up to 20 dB attenuation

19 Bjørge Solberg & Andersen Whisper III Flow passes through small holes –Level 3 Uses 1.6 mm dia –Level 1 Uses 3.2 mm dia –6 dBA difference Increases frequency Complimentary body design Jet independence Up to 30 dB attenuation

20 Bjørge Solberg & Andersen Whisper III C/d = 3.4 dP/P 1 < 0.99 C/d = 2.7 dP/P 1 < 0.75 C/d = 2.0 dP/P 1 < 0.6 Air Flow P1P1 P2P2 B3 1.6 mm C3 1.6 mm A3 1.6 mm

21 Bjørge Solberg & Andersen WhisperFlo Staged Reduction of Pressure Shift Frequency Spectrum Higher Unique Passage Shape Jet Independence Manages Velocity Using an Expanding Area Principle Complimentary Body Design Up to 40 dB attenuation

22 Bjørge Solberg & Andersen WhisperFlo Flow Passage Inlet Outlet

23 Bjørge Solberg & Andersen Lyddemper

24 Bjørge Solberg & Andersen Reduksjon av støy

25 Bjørge Solberg & Andersen Globe ventil med diffuser Begrense støy-generering

26 Bjørge Solberg & Andersen VESKE FLASING CAVITATION

27 Bjørge Solberg & Andersen Pressure Velocity Liquid Flow through an Orifice Vena Contracta Lowest Pressure Highest Velocity

28 Bjørge Solberg & Andersen Pressure Cavitation Vena Contracta Vapour Pressure Vapour Bubbles Form Vapour Bubbles Collapse

29 Bjørge Solberg & Andersen High Recovery Valves (Km= Fl 2 = 0.5) Line of sight valves; Butterfly, Ball Pressure Low Recovery Valves (Km = Fl 2 =0.8) Globe valves

30 Bjørge Solberg & Andersen Cavitation Damage

31 Bjørge Solberg & Andersen Cavitation - Path Treatment Cover exposed areas with resistant material –316 Sst< 18 HRC –416 Sst (Std trim material) 38 HRC min –440C56 HRC –Alloy 6 (Stellite)36 to 44 HRC –Ceramic –Tungsten Carbide

32 Bjørge Solberg & Andersen Cavitation - Path Treatment Cover exposed areas with resistant material –316 Sst< 18 HRC –416 Sst (Std trim material) 38 HRC min –440C56 HRC –Alloy 6 (Stellite)36 to 44 HRC –Ceramic –Tungsten Carbide

33 Bjørge Solberg & Andersen Cavitation - Path Treatment Select body style that directs the cavitation away from surfaces ( Isolates ) –Angle body Flow down Liner (Hardened Material) Hardened trim Micro-Flat Trim for low Cv requirements –Cavitation is confined to the centre of the outlet passage

34 Bjørge Solberg & Andersen Cavitation - Path Treatment Select body style that directs the cavitation away from surfaces –Vee Ball Valve Reverse flow Stellited ball Forward Flow Reverse Flow

35 Bjørge Solberg & Andersen Cavitation - Path Treatment Aspiration –Inject air into cavitating flow stream Air bubbles absorb energy released in bubble collapse

36 Bjørge Solberg & Andersen Cavitation - Path Treatment Cavitrol III 1 Stage Flow down Holes directly opposing –Keeps any cavitation in centre of cage away from surfaces

37 Bjørge Solberg & Andersen Cavitation - Source Treatment Treating the cause of cavitation –Use valve trim that avoids cavitation Low recovery valve –High F L 2 ( K M ) –Change from rotary valve to globe Pressure P1P1 PVPV P2P2 High Recovery Valve (Km) F L 2 = 0.5 Cavitation Low Recovery Valve (Km)F L 2 = 0.85 No Cavitation

38 Bjørge Solberg & Andersen Controlling orifice Hole shape High Capacity Low Recovery The hole is designed to maximize flow without flow separation from the wall, and with enough recovery volume for the fluid from the previous orifice. Pilot hole and recovery volume flow

39 Bjørge Solberg & Andersen Hole Design - Control Flow Separation Thin Plate Low Capacity Low Recovery Thick Plate High Capacity High Recovery Cavitrol Hole High Capacity Low Recovery Any cavitation that does occur is outside cage wall

40 Bjørge Solberg & Andersen Staged Pressure Drop P1P1 P2P2 PVPV 1st Stage 2nd Stage 3rd Stage Standard Trim Staged Cavitrol Trim Note the uneven pressure drops. The first stage takes the majority of the drop so the last stage takes very little and can control Pvc very close to Pv.

41 Bjørge Solberg & Andersen 3 Stage Cavitrol III Trim

42 Bjørge Solberg & Andersen CAVITROL IV NO SIGNIFICANT PRESSURE DROP MORE THAN 90% OF THE PRESSURE DROP VERY LOW INLET PRESSURE TO FINAL STAGE CAV4 with Cavitrol IV Trim Trim can take pressure drops up to 448 Bar Protected seating surface eliminates significant pressure drop across seating surfaces Trim can be used in other globe or angle valves Staged clearance flows

43 Bjørge Solberg & Andersen MINI CAV4 TRIM AVAILABLE IN 2” CLASS 1500 AND 2” CLASS 2500 DESIGN EHS VALVES 1” DIAMETER PORT, 3/4” TVL Cv RANGE -.1 TO 2.9 SAME LIMITS AND FEATURES AS STANDARD CAV4 USED FOR METHANOL LETDOWN CAV4 Special Products Group

44 Bjørge Solberg & Andersen Application Hole size –Cav III 1-stage hole size = ” or 0.125” diameter –Cav III 2 and 3 stage smallest hole size (in the first stage sleeve) = 0.049” diameter –Larger holes for can be used for less plugging, but will reduce cavitation protection. –If larger holes are used more stages are required.

45 Bjørge Solberg & Andersen Velocity - Cavitrol Outlet Stage: Average velocity = 45 ft/sec Peak velocity - 57 ft/sec Second stage velocity lower than First stage

46 Bjørge Solberg & Andersen Separator Level Control LC Oil Water Oil Gas Oil level Control valve Water level Control valve Gas outlet Crude Inlet from well head

47 Bjørge Solberg & Andersen Produced Water/Water Injection Valves

48 Bjørge Solberg & Andersen Challenges of these applications Cavitation –High pressure drops Erosion –High pressure drops –Sand and other particles Corrosion –Sour conditions –Chloride stress cracking

49 Bjørge Solberg & Andersen Produced Water/Water Injection Valve Issues High pressure drop –Can lead to damaging cavitation and erosion Solid particulate can lead to plugging of conventional severe service trim Tight shutoff required –Protects the valve from low flow damage when in the closed position Possible corrosion issues –Issues with stress corrosion cracking need to be addressed Depends upon H2S and chloride concentration Typical stacked disc trim

50 Bjørge Solberg & Andersen Erosion Hard surfaces –decreases the amount or speed of damage –Alloy 6 –440C –Tungsten Carbide –Ceramics Increasing erosion resistance

51 Bjørge Solberg & Andersen Better Solution - Fisher NotchFlo DST Pressure staging reduces vibration Available in 4 stages and capable of up to 180 Bar of pressure drop Ability to pass particles up to 12 mm diameter Protected seat maintains shutoff integrity Hardened materials resist erosion damage Can be used for globe or angle valve configurations

52 Bjørge Solberg & Andersen Trash Tolerance - Notchflo vs. DST 1” 2” 3” 4” 6”8”0.1”0.2”0.3”0.4” 0.35 ” 0. 5”.375”.75” Particle Size NotchFloDST.25”.25”.375”.75”

53 Bjørge Solberg & Andersen DST “Dirty Service Trim” W6787-1

54 Bjørge Solberg & Andersen DST Flow Down W678-1

55 Bjørge Solberg & Andersen Rotary Actuator

56 Bjørge Solberg & Andersen

57

58 HOOK UP

59 Bjørge Solberg & Andersen DVC6000

60 Bjørge Solberg & Andersen E.SEAL


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