piping hanger presentation
TRANSCRIPT
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The Total Solution for Plant LifeCopyright KEPRI-LAST All rights reserved.
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Piping & HangerPiping & Hanger
Korea Electric Power Research InstitutePower Generation Research Laboratory
Jung-Seob Hyun
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StressStressAnalysisAnalysis
Diagnosis ofDiagnosis of
Piping & SupportPiping & Support
Fatigue TestFatigue Test
Data BaseData Base
SystemSystem
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Contents1. Session 1 : Introduction of Piping System (0.5hr)
Introduction
Damage Examples of Pipe and Supports
2. Session 2 : Design of Piping System (1.0hr)Introduction
Piping Codes and standards
Basic equations of piping stress analysis
Stress evaluation of piping system
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4. Session 4 : On-line Monitoring System of Piping (0.5hr)Introduction
Development of Measurement Device for 3-D Piping
Displacement
On-line Monitoring Technology
3. Session 3 : Piping Support System (1.0hr)Introduction
Support(Hanger) Type & Load System
Damage examples of piping & hanger system
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Contents1. Introduction2. Damage Examples of Pipe and Supports
Session 1 : Introduction of Piping System
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What is the piping displacement?
1. Introduction
- Thermal expansion of Piping Line expands toward 3 axis direction
- Piping hangers support thermal expansion load and deadweight during operation
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What is the piping supports?
- Hanger, Restraint and Snubber are types of piping support
- If piping support is rigid, it creates excess stress at the piping welding area
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Damage examples of pipe (1)amage examples of pipe (1) Swelling of steam pipeSwelling of steam pipe
-- in the end of creep lifein the end of creep life
-- surface hair crack, swellingsurface hair crack, swelling
-- swelling areaswelling area
Dia. : 209mmDia. : 209mm --> 230mm> 230mm
Length : 550mmLength : 550mm
-- Since1993, We have managed lifeSince1993, We have managed life
consumptionconsumption --> prevention> prevention
of pipe ruptureof pipe rupture
Pipe cracksPipe cracks-- Excess displacement byExcess displacement by
frequent startfrequent start--up, shutup, shut--downdown
-- Contacted with concrete floor,Contacted with concrete floor,
Longitudinal cracks byLongitudinal cracks by
compression stress abovecompression stress above
allowable stressallowable stress
2. Damage examples of piping & support
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Pipe RupturePipe Rupture-- Rupture in weld area atRupture in weld area at
elbowed pipeelbowed pipe
-- It caused by excess stressIt caused by excess stress
concentrationconcentration
Pipe DeviationPipe Deviation-- Deviation of main steam andDeviation of main steam and
hot reheat linehot reheat line
-- Damage of hydraulic snubberDamage of hydraulic snubber
-- It caused by abnormalIt caused by abnormal
displacement of stickeddisplacement of sticked
hangershangers
Damage examples of pipe (2)amage examples of pipe (2)
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Error of cold position settingError of cold position setting-- It needs adjustment of hangerIt needs adjustment of hanger
load and cold position whenload and cold position when
hanger is installed during thehanger is installed during the
constructionconstruction
-- Wrong adjustment inducedWrong adjustment induced
rigid hanger motionrigid hanger motion
-- Adjust correct cold position byAdjust correct cold position by
using the hanger Turnbuckleusing the hanger Turnbuckle
Crack of pipe Lug areaCrack of pipe Lug area-- Crack of pipe lug at rigidCrack of pipe lug at rigid
hangerhanger
-- rigid hanger is installed at 1/3rigid hanger is installed at 1/3
position of vertical pipe lineposition of vertical pipe line
-- stress concentration in lugstress concentration in lug
area during the frequent startarea during the frequent start--up,up,
shutshut--downdown
Damage examples of pipe hanger (1)amage examples of pipe hanger (1)
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high vibration of turbine casinghigh vibration of turbine casingby support deviationby support deviation
-- Abnormal displacement due toAbnormal displacement due to
support deviationsupport deviation
-- Deviation and excess vibration ofDeviation and excess vibration of
turbine casing bodyturbine casing body
-- It need to balance pipe support byIt need to balance pipe support by
adjusting pipe hangeradjusting pipe hanger
Hanger rod ruptureHanger rod rupture-- Rod rupture is induced by abnormalRod rupture is induced by abnormal
displacement and high vibrationdisplacement and high vibration
-- Crack due to stress concentrationCrack due to stress concentration
by hanger rod ruptureby hanger rod rupture
Damage examples of pipe hanger (2)amage examples of pipe hanger (2)
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Increase of old power plantsabove 20 years (about 70%)
Mainten
ance
ofp
ipe&su
pports
ystem
Mainten
ance
ofp
ipe&su
pports
ystem
Importance ofImportance ofmaintenance for pipingmaintenance for piping
and supportsand supports
Frequent start-up, shut-downand severe operating condition
Rapid increase of technicalsupports for piping and support
Life extension by early detectionLife extension by early detection
and preventive maintenanceand preventive maintenance
of pipe lineof pipe line
Pipe Swelling in the end of life before the pipe rupture
Replacement of pipe line by cracks in the weld area
Cracked shape of elbowed pipe
Increase of abnormal displacementof pipe line
Damage of Pipe support
Abnormal vibration of pipe lineby damaged supports
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Damage mechanism of pipe Creep Circumferential direction :
- thermal expansion of pipe
- Type crack by creep cavity,
- Bending Stress
Longitudinal direction :- internal pressure of pipe
- residual stress in weld area- swelling in the end of creep damage
Thermal fatigue or creep-fatigue Independent thermal fatigue or
dependent creep-fatigue in
frequently start-up, shut-down
material degradation Creep-fatigue voids, embrittlement,
hardening, softening, corrosion by
material degradation
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Damage mechanism of pipe support (hanger) Stick of rotating arm It caused by oxide scale because
hanger installed at outside
Rupture of hanger spring or Rod It caused by surface corrosion,
stress corrosion of hanger spring
Rod rupture by rigid motion of stickedhanger in over-loaded pipe line
Scale over of Travel indicator
Design error of hanger load,displacement, thermal movement
It caused by sticking of rotating arm
or internal spring
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Contents1. Concept of Piping System2. Piping Codes and standards3. Basic equations of piping stress analysis4. Stress evaluation of piping system
Session 2 : Design of Piping System
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1. Piping Design1.1 Pipe properties1) Pipe O.D(I.D) : tolerance
2) Material : Carbon Steel, Alloy steel(A335-P11,P12,P22,P91), Stainless Steel
3) Pipe Wall Thickness : Nominal, Average, Minimum, Maximum
4) Fluid Contents : Steam, Water, Oil, Gas
5) Insulation : Rock wool, Pearlite, Calcium Silicate
6) Modulus of Elasticity : Material, Temp7) Thermal Expansion Coefficient : Material, Temp
1.2 Design Considerations : Loadings1) Internal & external Pressure : Design pressure
2) Hammering or Jet Force due to sudden pressure change
3) Deadweight of fluids, pipe, insulation
4) Wind, snowfall, vibration and seismic loads5) Reaction forces of supports
6) Thermal expansion Loads
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1.3 Design Considerations : Operating Conditions1) Design condition
- Deadweight(fluids, insulation, valve etc.)
- design pressure
- seismic load
2) Normal operation
- Deadweight
- Internal pressure- thermal expansion load
3) abnormal operation
- Deadweight
- Internal pressure
- thermal expansion load
- Dynamic loads
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1.4 Design Limits : Stresses1) Primary stress(by the pressure)
Normal, shear or bending stresses generated
by the imposed loading which are necessary
to satisfy the laws of equibrium of internal
and external forces and moments
- Dead load by the weight
- longitudinal and circumferential stresses due
to internal pressure2) Secondary stress(by the thermal)
Varying from positive to negative across
the pipe wall thickness because of differential
radial deflection of the pipe wall
- circumferential bending stress in a curved pipe
3) Localized stress
Peak stress due to stress concentration
- stress by local discontinuity + primary + secondary
- a source of direct failure
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1.5 Design Limits : Allowable Stress1) 62.5% stress of yield stress at operating temperature
2) 0.01% creep stresss during 1,000hr at operating temperature3) Equation by the ASME B31.1 Power Piping Code
SA = 1.25 Sc + 0.25 Sh
-> 1.25 f (Sc + Sh) : include safety factor f
-> 1.25 (Sc + Sh) : generally consider safety factor is 1
where, Sc : allowable stress of material at ambient temepratureSh : allowable stress of material at operating temperature
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2. Piping Codes and StandardsThe objective of Code rules and Standards : achieve minimum requirementsfor safe construction.
1) American National Standard Institute(ANSI)
- ANSI B 16.5 : Spec. of piping fitting
2) Manufacturers Standardization Society of the Valve & Fitting Industry(MSS)
- MSS SP-58 : Material, design, manufacturers of pipe hangers and supports
- MSS SP-69 : Selection and application of pipe hangers and supports- MSS SP-89 : Fabrication and installation practices of pipe hangers and supports
3) American Society of Mechanical Engineers(ASME)- B31.1 : Power piping- B31.2 : Fuel gas piping
- B31.3 : Chemical plant & petroleum refinery piping
- B31.4 : Liquid petroleum transportation piping
4) American Society for Testing and Material (ASTM)
- Spec. of Piping material
5) American Welding Society(AWS)6) American Petroleum Institute(API)
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3. Basic Equations of Piping Stress AnalysisASME B31.1 Analysis of piping components
1) Stress due to sustained loads
2) Stress due to occasional loads
3) Thermal expansion loads
k = 1.15 ( < 10% of 24hr operating period)= 1.2 (
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4. Stress Evaluation of Piping SystemPiping Analysis Program(Pipepak, ANSYS etc.)
1) Thermal expansion loadsA. Thermal expansion
where, : Thermal expansion movement
: Thermal expansion coefficientL : Piping length
T : Metal temperature
B. Flexibility of piping
- Check the displacement of piping support(hanger)
- Check distance of supports, support type, pipe length
Computer program Optimal flexibility
C. Thermal stress analysis- Requirement stress : 65 - 75% of allowable thermal stress SA
- Apply modelling, boundary condition, thermal loads
- Calculate thermal stress by using the piping analysis program
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2) Calculate Thermal Stress
Input loads - sustained loads,occasional, thermal loads
ASME B31.1 Power Piping Code
Input boundary conditionBoiler, Turbine, supports
Piping modelling - IsometricDrawing
Analysis Dead Weight- Compare design load
Analysis displacement/stress- Compare design data
Simulation- Cause analysis
Optimal repair- Pipe & supports
extra displacement Bad supports
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Contents1. Support (Hanger) Type2. Structure of Piping Supports3. Inspection of Piping Supports4. Adjustment of Piping Hanger5. Replacement of Piping Hanger6. Damage examples of Hanger
Session 3 : Piping Support System
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KEPRIKEPRI -- LASTLAST1. Support TypeA. Support deadweight (pipe, insulation, fluids) and thermal expansion loads
- Rigid, Constant Spring and Variable Spring HangerB. Restraint 3D movement by the thermal expansion (Anchor, Guide, Stopper)
C. Prevent piping shock by the vibration, hammering occasional loads(Snubber)
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Type Name Functions Installation
Hanger
or
Support
Rigid Hanger
A device used specifically to
sustain a portion of weight of the
Piping system plus any
superimposed vertical loading.
Vertical movement is 0mm or
< 2mm
Spring Hanger
(Variable Hanger)
Vertical movement < 50mm
Load change rate 25%
Constant HangerVertical movement > 50mm
Load change rate 6%(theory)
Restraint
Anchor
Any device which prevents, resist,
or limits the free thermal movement
of the piping.
Full fixation
GuidePrevent ratation
one direction movement
Restraint
(Stopper)Prevent translatory movement
Brace
Spring type
SnubberA device primarily intended to resist
displacement of the piping due to
The action of any forces other thanthose due to thermal expansion or
to gravity.
high resistance against rapid
displacement caused bydynamic loads
Hydraulic SnubberMechanical Snubber
Shock Absorber
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KEPRIKEPRI -- LASTLAST2.1 Constant spring hanger2. Structure of piping supports
Horizontal movement : < 4 degree ( swing )
Support constant load Variable support load : 10%
Read vertical movement Indicated by Travel Index Plate
Vertical movement : > 50mm
Load change rate : Theoretically 0, but really < 6%
Lever Type
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KEPRIKEPRI -- LASTLASTHorizontal Type (Old Type)
Vertical Type (New Type)
Locking Device
Horizontal Type (New Type)
Installation Holeof Locking Rod
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Locking before hydro test
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A. Index plate divided by 10 spaceB. Design maximum Travel 140mm, Cold movement : 0, Hot movement : 7
C. Pipe vertical movement : 98mm
- 1 space : 140/10=14mm
- total 7 space : 147=98mm
How to calculate pipe displacement ?
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Sliding Type
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Locking Device
How to calculate pipe displacement ?A. Directly Calculate Index from plate
B. Insert locking device before hydro test
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Typical damage of constant spring hangerTypical damage of constant spring hanger
Locking state during operation
Separation Indicator from travel
Interfere with pipe and hanger Internal corrosion or rust
Scale over Upper/Lower LimitLocking state during operation
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Small size, Small weight
Sometimes used as Rigid hanger by lock pin Load travel is linear
(indicated by Index Plate)
Load change rate : < 25%
Vertical movement : < 50mm
2.2 Variable spring hanger
Vi i P i f C T h
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Old Type (locking by Pin Inserting) New Type (Locking by Nut)
Locking Device
Vi i & P i f C T hVi i & P i f C T h
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How to calculate pipe displacement ?A. Directly Calculate Index from plate
- Read the travel and load values in the name plate at cold and hot position- Read the lower position of spring plate
B. Insert locking device before hydro test
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Locking state
It is not locking state in this picture
Scale over
Upper/Lower Limit
Internal corrosion and rust
Typical damage of variable spring hangerTypical damage of variable spring hanger
Deviation of installed position
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- Read the travel and load values in the name plate at cold and hot position
- Read the lower position of spring plate
Indicator of variable spring hanger
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KEPRIKEPRI -- LASTLAST2.3 Other hangers Unbalancing loads of rigid hanger rodUnbalancing loads of rigid hanger rod
* In the case of rigid hanger, it must inspect installation load* In the case of rigid hanger, it must inspect installation load
Malfunction of anchor and guideMalfunction of anchor and guide
Rupture damage of rodRupture damage of rod
Damage of snubberDamage of snubber
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KEPRIKEPRI -- LASTLASTLoad Variability of Spring HangerV = (Wh-Wc) / Wh (%)
ex) Variable spring hanger, k =10kg/mm, = 10mm, Wc = 400kgWh, V = ?Pipe displacement
LoadVariability
Cold Load
Hot LoadDisplacement
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1) Preliminary data Isometric Drawing- position of Hangers* Isometric drawing must be referred during inspection for confirming
position and installation of piping support
Drawing of Pipe Hanger
Recording of operating and inspection in the past
2) Inspection time before the O/H (Hot state) during the O/H (Cold state)
* Hanger is inspected minimum 7 days after the plant is shut down
After the O/H (Hot state) : in case of adjusting hanger travel* Indicator position must be recorded before and after overhaul
3) Inspection(1) External appearance
Bolting and nuts area (high vibration area) deformation and rupture of components
Locking state
interfere with pipe
3. Inspection of piping supports3.1 Introduction
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(1) Recording of indicator travel
Recording all items- Inspection date, power output, pipe line name, hanger number,
hanger specifications, design values Recording cold and hot position of travel without omission on the basis
isometric drawing Use the Excel program for graphing data as possible
* Actual piping displacement is represented with graphs using Excel
program and is compared to that of design displacement
3.2 Analysis of inspection results
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(2) Analysis of design and actual displacement for hanger travel
Design and actual displacement (normal state)
0
2040
60
80
100
120
140
160
511-C003
511-C005
511-C006
512-C003
514-C001
516-C001
521-C003
521-C005
521-C006
522-C003
524-C001
526-C001
Design displacement
Actual displacement
0
50
100
150
200
250
C001 C002 C003 C004 C005 C006 C007 C008 C009 C010
Design displacement
Actual displacement
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Design and actual displacement (abnormal state)
-100
-50
0
50
100
150
200
250
511-
C001
511-
C003
511-
C006
511-
C007
521-
C001
521-
C003
521-
C005
521-
C007
002-
C001
002-
C004
002-
C005
002-
C008
Design displacementActual displacement
-40
-20
0
20
40
60
80
100
120
140
160
180
C001 C002 C003 C004 C005 C006 C007 C008 C009 C010 C011 C012 C013 C014 C015 C016 C017 C018 C019 C020
Design displacement
Actual displacement
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Preliminary action- Preparation of Scaffolds and Chain block- Cleaning bolts, nuts and hanger turnbuckle area
Recording travel indicator Hot state Cold state Discussion of adjust method
Adjustment of hanger travel Adjust hanger travel by using the hanger turnbuckle
adjust hanger travel : rotate turnbuckle- From top point(0) to bottom point(10) : rotate turnbuckle in clockwise- From bottom point to top point : rotate turnbuckle in counterclockwise
Adjust hanger load by rotating nuts for using the load change adjust hanger load : rotate nuts
- Increase hanger load : rotate nuts in clockwise- decrease hanger load : rotate nuts in clockwise
Observation of adjacent hangers- From high-elevation to low-elevation
Recording travel indicator at final cold position
Recording travel indicator at hot state
4. Adjustment of piping hanger
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Working condition- Limit position of travel indicator at cold and hot state
(It is impossible to adjust indicator)
- Abnormal position (there is no change travel indicator) at cold/hot state- Severe corrosion and rust in internal components
- Rod bending
- Crack or rupture of hanger rod or internal spring
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Preliminary action- Preparation of Scaffolds and Chain block
- Cleaning bolts, nuts and hanger turnbuckle area
- Locking hanger- Install and load chain block
Disconnect of old hanger- Separation of turnbuckle
- Grinding of weld parts
- Move down of old hanger by using the chain block
Installation of new hanger- Confirmation of hanger number with isometric drawing
- Move up of new hanger by using the chain block
- Connection of new hanger and structural attachments
- Connection of new hanger and sling rod
(After connected, remove lock pin)
- Conjunction of turnbuckle and Adjust travel- Removal of scaffolds and chain block
- Recording of cold travel
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KEPRIKEPRI LASTLAST6. Damage Examples of Hanger
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- Main damage of hanger
- It caused by oxide scale because hanger installed at outside- At operating, indicator is not moved
6.1 Stick of rotating arm
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- Spring rupture : Outside installed hanger, brittle fracture induced bysurface
corrosion, stress corrosion
- Rod rupture : perfectly stick inside hanger. when it was over-loaded,
neck area of rod is fractured
6.2 Spring & Rod Rupture of Constant and Spring hanger
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- P.T Check of support lug for not moving spring hanger
- crack of weld area
6.3 Cracks of Support Lug
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Damage examples of piping & hanger systemA. ULSAN Power Plant #4 Hot Reheat Pipe
B. SAMCHUNPO Power Plant #4 Main Pipe Line
C. Dong-hae Power Plant #1 Main Steam Line
D. Ho-nam Power Plant #2 HP Bypass Line
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A. Damage of Hot Reheat Pipe for ULSAN Power Plant #41) History
- After construction, hot reheat pipe is producing excess displacementin vertical pipe line over 20 years- From this phenomenon, Pipe is contacted with conctrete floor- Crack is generated by over stress in welded area of elbow
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2) Displacement and thermal stress analysis
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3) Over Stress
- When elbow of vertical line is contacted with concrete floor,
234% of allowable stress is generated at cracked area
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4) Repair of cracked area
- Welding and heat treatment of cracked area
- Movement up(70mm) of Vertical line by using the hydraulic device and rigid hanger(U12)
- U14, U16, U17, U18 Hanger balancing at cold state
- Digging 100mm concrete floor for stress relaxation
5) Replacement of pipe
- Calculate plastic deformation
- Test of tension, indentation, hardness
- Replacement of 35m pipe line
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S
B. Damage of Main Pipe Line for SAMCHUNPO Power Plant #41) History When HIP shell center line GIB key is released, HIP shell movement of TBN casing
excess limit of movement
Movement of Front Standard & Sole Plate
high vibration of TBN
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2) Thermal expansion of main pipe line
Displacement of hot reheat line and main steam line is unbalancing due to sticked hanger
Shell movement of casing excess limit
Move Front Standard & Sole Plate
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3) Displacement and thermal stress analysis
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System2
Hanger
System3
Hanger
Deviation
10mm 66mm 56mm
System2
Hanger
System3
Hanger
Deviation Design
Deviation
62mm 77mm 15mm 20.8mm
Cut and InsertNew Pipe
Rehabiliation of Piping design displacementRehabiliation of Piping design displacement
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C. Damage of Main Pipe Line for Dong-hae Power Plant #1
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51E Hanger (13 Floor)
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- Diagnosis of main pipe hanger (Main Steam, Hot Reheat, Cold Reheat)
- Actual displacement of Main Steam, Hot Reheat Line Hanger is agree withdesign displacement
0 2 4 6 8 10 12 14 16 18 20 22
0
10
20
30
40
50
60
70
80
90
Total
Displacement(mm
)
Main Steam Line Hanger No.
Design Displacement
Actual Displacement
0 5 10 15 20 25-20
0
20
40
60
80
100
120
140
160
TotalDisplacement(mm
)
Hot Reheat Line Hanger No.
Design Displacement
Actual Displacement
D. Damage of Pipe Line for Ho-nam Power Plant #2
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Ab l di l f HP B Li
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- Abnormal displacement of HP Bypass Line
0 2 4 6 8 10 12
0
10
20
30
40
50
60
70
Total
Displacemen
t(mm)
HP Bypass Line Hanger No.
Design Displacement
Actual Displacement
2001. 4
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1. Introduction2. Development of MeasurementDevice for 3-D Piping Displacement3. On-line Monitoring Technology
Session 4 : On-line Monitoring System of Piping
Contents
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KEPRIKEPRI -- LASTLAST. Introduction. Introduction
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q To understand importance of pipe displacement
measurement to provide a high degree of confidence in
piping system
q To introduce an experience that on-line displacement
monitoring system applies to steam piping to measure
pipe displacement
q To introduce on-line displacement monitoring
system for high temperature piping
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Obj iObj ti
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ObjectivesObjectives
q To understand importance of pipe displacement
measurement to provide a high degree of confidence
in piping system
q To introduce an experience that on-line
displacement monitoring system applies to steam
piping to measure pipe displacement
q To introduce on-line displacement monitoring
system for high temperature piping
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KEPRIKEPRI -- LASTLAST2. 3D Disp. Measurement Device. 3D Disp. Measurement Device
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LVDT type piping displacement measurementVDT type piping displacement measurement
Moving point A(Universal joint)
Distance
r
(LVDT)
angles , (Encoder 2)
X
Y
Z
A
The distance and angles at one point in the spherical coordinate
can be measured and transformed into rectangular coordinate- Two encoder measures 2 angles and
- One LVDT measures the distance r
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Multiulti-link type piping displacement measurementink type piping displacement measurement1. To minimize any possible error depending on an installation location.
2. To reduce the weight of instruction and cut down cost
- Link l1 and l2 are constant. 1, 2 and 3 is absolute angle that is
measured from encoder.
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TestNo.
True value Measured value
X
(mm)
Y
(mm)
Z
(mm)X (mm)
Errorrange
(%)Y (mm)
Errorrange
(%)Z (mm)
Errorrange
(%)
1 300 300 300 300.12 +0.04 300.40 +0.13 300.39 +0.13
2 400 400 400 400.09 +0.02 400.22 +0.05 400.23 +0.05
3 250 350 300 249.87 -0.05 350.16 +0.04 300.28 +0.09
4 200 300 400 199.82 -0.09 300.44 +0.15 400.15 +0.03
Laboratory testaboratory test
Two types of equipment have precise measurementTwo types of equipment have precise measurement
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The demonstration in the field(LVDT type)The demonstration in the field(LVDT type)
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Actual displacement at installed
location under full load
X : 22mmY : -37 mm
Z : 26mm
The demonstration in the field(LVDT type)The demonstration in the field(LVDT type)
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The results of demonstrationhe results of demonstration
Sudden DropSudden Drop
5times5times
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The field application : LVDT type, B fossil power plantThe field application : LVDT type, B fossil power plant
3. On. On-line Monitoring Technologyine Monitoring Technology
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The field application LVDT type, B fossil power plantThe field application LVDT type, B fossil power plant
On-line Monitoring
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Monitoring programonitoring program
Control partMonitor part
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he measured results(LVDT type, ossil power plant)
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-150
-100
-50
0
50
100
150
200
0 0.5 1 1.5 2 2.5 3 3.5 4 4.5
Period (day)
Displacement(mm)..
MS2-X
MS2-Y
MS2-Z
MS2-L
MS12-X
MS12-Y
MS12-Z
MS12-L
MS23-X
MS23-Y
MS23-Z
MS23-L
Preparation forOperationHanger
Unlocking
Boiler Start
Preheatof Turbine
Full Power
TurbineStart
The measured results(LVDT type, B fossil power plant)
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The field application : Multihe field application : Multi-link type,ink type, T fossil power plantossil power plant
Monitor part
Control part
33
33
11
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The measured results (2th floor,he measured results (2th floor, T fossil power plant)ossil power plant)
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piping displacement measurement ofT fossil power plant (Turbine inlet)
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The measured results (8th floor,he measured results (8th floor, T fossil power plant)ossil power plant)
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piping displacement measurement ofT fossil power plant (Y-piece)
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Ree-adjustment of 8djustment of 8thh floor,loor, T fossile power plantossile power plant
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Recover steam pipe displacement by reecover steam pipe displacement by re-adjustment of hangerdjustment of hangerBeforeefore Afterfter
DesignDesign
CompensationCompensation
MeasurementMeasurement
DesignDesign
CompensationCompensation
MeasurementMeasurement
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KEPRIKEPRI -- LASTLASTConclusiononclusion
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(1) The study developed an LDVT type and a Multi-link type measurement
device to measure 3-dimensional thermal expansion displacement of the
pipe and developed a program that can measure and monitor obtained datafrom the measurement devices on-line.
(2) Three-dimensional data that were gained from the two-type displacement
measurement devices turned out to be similar to the ones in normal
operations from each direction, proving the credibility of the displacement
monitoring system. In the case of P fossil plant, piping displacement out
of the designed displacement range was found, indicating that anadjustment of hanger that is supporting the piping was necessary for
better management of fossil plant durability.
(3) The developed system is expected to greatly contribute to stable
operations of main piping if it is applied to various domestic power plants
and further applied to high-temperature and high-pressure piping such as
in the heat absorption and in the oil-chemistry industry.
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Thank you!
Korea Electric Power Research InstituteKorea Electric Power Research Institute
(KEPRI)(KEPRI)
JungJung--Seob HyunSeob Hyun