Vladimír Potočný

HOW TO ENSURE THE RELIABLE, SAFE AND EFFICIENT OPERATION OF TRANSMISSION

NETWORKNETWORK

7th European Forum Gas 2009, 18th-19th June 2009, Madrid

Agenda

• eustream, a.s.

• Pipeline integrity

ILI (I t l i ti )• ILI (Internal inspections)

• CP (Cathodic Protection)

• GIS

• Risk model

• Benefits

eustream, a.s.

eustream, a.s.

Total transit capacity: 93 billions m3/year93 billions m3/year

Turnover (2008):Turnover (2008): Sales of products and services:

804 0 mil €804,0 mil €

E lEmployees: 1100

Objective of eustream, a.s.

The main mission of the company eustream, a.s. is to ensure the

reliable, safe and efficient operation of transmission

t k it t i bilit dnetwork, its sustainability and development, with a view to

maximum care safety and healthmaximum care, safety and health protection at work and with the minimum negative impact on the g penvironment in maintaining and improving the quality of services

provided.Policy of Integrated Management System in eustream, a.s.

Elements influences integrity of pipelines

ILIILIILIILI

CP (external inspection)CP (external inspection)

GISGIS

Internal inspection

• 1993pilot section DN 800 45kmpilot section, DN 800, 45km, MFL (Magnetic Flux Leakage) method, British Gasmethod, British Gas

• 1994-1999 inspected all pipelines (DN 700, DN 900, DN 1200, DN 1400)

2250 km pipelines inspected

Assessment and Maintenance plan

• assessment made according to ASMEaccording to ASME B31.G, DNV RP-F101

• the criteria for how to• the criteria for how to repair corrosion defects were specifiedwere specified

• the repair methods were specifiedspecified

• the maintenance planwas worked outwas worked out

Assessment and Maintenance plan

0,7

0,8

0,9

ASME ERF=1,00ASME ERF=0,96

0,7

0,8

0,9

ASME ERF=1,00ASME ERF=0,96

• I.area of unacceptable /t)

0,4

0,5

0,6

kade

fekt

u(d

/t)0,4

0,5

0,6

kade

fekt

u(d

/t)

pdefects

• II.area of temporarily I.IIb.pt

h of

def

ect(

d/

0,1

0,2

0,3Hĺbk

0,1

0,2

0,3Hĺbk

temporarily acceptable defects

• III.area of

IIa.III.

Dep

0,00 100 200 300 400 500 600 700 800 900 1000

Dĺžka defektu (mm)

0,00 100 200 300 400 500 600 700 800 900 1000

Dĺžka defektu (mm)

area of acceptable defects Length of defect (mm)

I. Cut out, or epoxy shell

II. Epoxy shell or clock spring III. Re-coating

Repair method

Up to year 2000: Repaired 48,5 km of pipelines

ILI results comparing

1997 - inspection 2002 – re-inspectionafter repairsafter repairs

2008 – after repairs

Data were stored in separated system IDAS

Impact of natural conditions on pipelines

• Difficult natural conditions:• geographic (erosion,

l d lid )landslides)• hydrologic (flooding)• land using (agricultural, 3rdg ( g ,

party interference)• Number of environmental

data is stored and classifieddata is stored and classified• risk of erosion, landslides• risk of floodingrisk of flooding• soil aggressiveness...

Natural conditions influence pipeline integrity

Activities

• Monitoring• strain gauges g g

measurement• land surveying

measurement

• Activities• reconstruction• reconstruction

(stabilization) of danger slopes

• draining• draining• controlled pipeline

lowering (increasing depth cover)depth cover)

Steel bridging

• 23 steel pipeline bridgings across riversbridgings across rivers

• visual diagnostic

• land survey measurementmeasurement

• plan to transform intoplan to transform into underground river crossings (safety and strategic reasons)strategic reasons)

Corrosion protection

• Passive protection• Pipeline coating

• 1 2 3 line – tape coating bitumen• 1, 2, 3 line – tape coating, bitumen• 4, 5 line - factory made PE coating

• Active protectionA li d i b i i f t it• Applied since beginning of transit system

• Common with other pipelines in the corridor (gas pipeline crude oilthe corridor (gas pipeline, crude oil pipeline, water...)

• Monitoring and controllingli d ffli t (1509• online and offline measurement (1509

measurement points)• All cathodic protection stations (100)

are monitored and controlled by yremote system (MARS)

Audit of corrosion protection system

• Two runs (1998-2002, 2003-2007, 2259 km)• intensive measurement

i i f th th di t ti i t• supervision of the cathodic protection equipment• soil aggressiveness analysis• location of the crossing points 3rd party facilities (pipelines,

cables )cables...)− stray current detection and

measurements− measurement of the range ofmeasurement of the range of

all foreign cathodic protection stations

− measurement of steel

Data were stored in

measurement of steel casings by using auxiliary source of direct current

− inspection of equipment and Data were stored in separate system of CP

inspection of equipment and documentation

GIS - 1993

• first data were based on scanned paperon scanned paper maps

• average (in) accurate(in) accurate about 10 m

• focused only on pipelinesp p

Data were stored in separate geographical system

GIS 2009

• pipelines were located in the field and all excavatedthe field and all excavated welds were surveyed by GPS (x,y,z, accuracy up to 1m)1m)

• all pipelines on compressor stations were

d i 3Dsurveyed in 3D• GIS database is

continually updatedy p• database contents

different kind of data (pipeline compressor(pipeline, compressor station, environmental...)

Integration

1995 Applications Database2002-2009

ILI ILI databaseILI

CP CP databaseIntegrated technicalCP CP databasetechnical database

interconnectedapplicationsGIS GIS databaseapplications

Integrated Technical Information System (ITIS)

Risk model

Integrated technical d b

Identifying of probability and consequence factorsSetting relative value to factors

database

ModelModel

e (C

)

g

ASME B31.8S, K. Muhlbauher

Visualization of

ASME B31.8S,K. Muhlbauher

Visualization of

Data source- high precise andupdated database is ns

eque

nce

Risk (R)R = P x C

Visualization of calculated risk

Risk

Visualization of calculated risk

Risk

updated database isfundamental condition

probability factor (P)

con

Risk assessment

Risk assessment

Risk management

Risk management

Benefits

Available, flexible, editable, highly precise data Systematic, complex solutionSystematic, complex solution

• Greater safety and reliability• identification of areas with cumulated possible problems (ILI,

h di i i l h f )cathodic protection, environmental, human factor...)• support for management and controlling process• our expert opinion of crossovers with 3rd-party networks (cables,

i li )pipelines...)

• Exact profits• maintenance cost savings (shorter excavations...)g ( )• exact response to compensation demands• evaluation of own asset

Conclusions

• eustream a.s., is the Slovak operator of the complextransport system built to transport natural gas from thetransport system built to transport natural gas from theRussia Federation into western Europe

• eustream has implemented a complex System of pipelinei t it t hi h i t f it I t t dintegrity management, which is a part of its IntegratedTechnical Information System (ITIS)

• ITIS brings together activities and knowledge of important(ILI CP i ) l hareas (ILI, CP, environment...), evaluates the consequent

degree of risk. ITIS offers complex information foreffective management and controlling

• by minimizing this risk eustream fulfils its mission ofoperating the transport system safely, reliably, efficientlyand in an environmental friendly manner

Thank you for your attention