Information To Assess Right Way Forward Cause of damage

Would you have surgery without seeing a physician to see what is wrong?

Extent of damage Job blow out Expands to become structural

Structural significance of damage If it will not become unsafe or cause loss leave it

Likely future damage if left – two extremes If it wont fail in design life leave it A stich in time

Prognosis if repaired Some repairs cause more problems than they solve

Life Cycle Cost – Cheap and repetitive vs once off and long life

Client Interview Ask questions

What does he want in terms of Overall Life Aesthetics Operational interference Safety Budget (lowest cost now or long term)

Risk Consequence of failure (Likelihood comes from survey)

History Design, construction, operation and maintenance

Inform Company policy on

Approach to assessment and repair Liability involved Risk minimalisation

Confirm in writing*

Damage Assessment

Damage

Spalling

Cracking

Active Corrosion

Future Activation

Future Damage

Survey Method

Visual

Visual

Potential, Drummy

Cl-, Carb, Cover

Resistivity

Polarisation

Repair

Patch

Injection

CP

Coating

Environmental

Control

Split structure into environments Prepare proformas based on

structural assessment detailing & general arrangement expected damage environmental exposure usage

Prepare inspection & testing plan Adopt defect classification code

Spray Zone

Splash Zone

Variable Pressure Hollow Leg

High Pressure Hollow Leg

Intermediate Zone

Lo

w V

alu

eL

ow

Val

ue

Hig

h V

alu

eH

igh

Val

ue

ComplexComplex SimpleSimple

Simplicity = Operability x InterpretabilitySimplicity = Operability x Interpretability

Val

ue

= A

pp

lica

bil

ity

/ C

ost

Val

ue

= A

pp

lica

bil

ity

/ C

ost

HighUse

LowUse

IEold

251 6

0.2

15

IEnew/Thick

REP

IEnew/Crack

GPRold

GPRnew

LPR

CR

TP

ISAT

RCMr

DRH