piping hanger presentation

8/22/2019 Piping Hanger Presentation

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The Total Solution for Plant LifeCopyright KEPRI-LAST All rights reserved.

Vision & Passion for Core Tech.Vision & Passion for Core Tech.

KEPRIKEPRI -- LASTLAST

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 areaswelling 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

Vi i & P i f C T hVision & Passion for Core Tech


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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

Vision & Passion for Core TechVision & Passion for Core Tech


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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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Vision & Passion for Core Tech.


(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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Vision & Passion for Core Tech.Vision & Passion for Core Tech.5. Replacement 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


KEPRI LAST


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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


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


KEPRIKEPRI LASTLAST


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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


KEPRIKEPRI LASTLAST


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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


KEPRIKEPRI LASTLAST


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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


KEPRIKEPRI - LASTLAST


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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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KEPRIKEPRI - LASTLAST

2) Displacement and thermal stress analysis




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KEPRIKEPRI LASTLAST

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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KEPRIKEPRI LASTLAST

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



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


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



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


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



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



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



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



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)



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)



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


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

piping hanger presentation

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