Rbi presentation inventure technologies

Specialsists in Tank Integrity & Compliance

J.F. Rosendaal & R.H. Algra

RBI presentation

• Asset Integrity Basics • Analysis example• Specific cases

Overview

2 Specialists in Tank Integrity & Compliance

Asset Integrity Basics

Specialists in Tank Integrity & Compliance3

Component breakdown

Critical structural parts• Membrane plates• Roof support structure• Nozzles• Foundation• Roofplates• Etc.

Critical functional parts• Pumps• Valves• Roof seal• Mixers• Overflow alarm• Etc.


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Component breakdown

Dominant degradation mechanisms

Membrane plates

Foundation

General thinning of plates? (p.e. wear & tear)

Local soil side corrosion? (p.e. water or chlorides)

Local topside corrosion like pitting? (p.e. product)

Bacterial corrosion?

Other?

Edge Settlement?

Even settlement?

Differential Settlement?

Planar tilt?

Sagging?

Other?

Specialists in Tank Integrity & Compliance


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Component breakdown


Corresponding Inspection

plan

Is the inspection/NDT actually adequate to monitor the degradation?

Example floorplate:Degradation mechanism: local soil-side corrosion.Wrong inspection: Spot-check UT from product-sideRecommended inspection: Floorscan

Does the plan cover sufficient area / is sufficiently detailed?

Degradations mechanisms that are not present (prevented) not need NDT!

Example floorplates:Foundation sufficiently high; floor-foundation transition adequatly sealed for rainwater; no soil contaminations (chloride), underside coated, etc. -> soil-side corrosion cannot occur -> Floorscan not required.

Example tankshell:Preferrent locations: liquid-to-vapour corrosion, increased corrosion at sun-side of tankshellWrong inspection: Spot-check UT along stairsRecommended inspection: UT magnetic crawler

UT points




Component breakdown



plan

Analysis & Secure in RB-

IT

Analysis using RB-IT 360

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Component breakdown



plan


IT

Is covered in the corporate methodology (modelomschrijving RBI)

What remains to be done: Perform analysis, discuss results and formulate plan for inspection & maintenance

How to analyse, assess and what to do step by step is covered in detail in the corporate methodology (modelomschrijving RBI)


Analysis example: Remaining Lifetime calculation

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Historic inspection & repairs

Data Analysis

Rejection limitRejectedAcceptable

Structural strength

TimeRemaining

lifetimeToday

Remaining lifetime assessment specific component

Weighed extrapolation based on anticipated service


Analysis example: Remaining Lifetime calculation

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Historic inspection & repairs

Data Analysis

Rejection limitRejectedAcceptable

Structural strength

TimeRemaining

lifetimeToday

Remaining lifetime assessment specific component

Weighed extrapolation based on anticipated service

IMPORTANT FACTS:

Trending historic data is not just connecting dots!!! A reliable degradation rate is essential for the assessment and requires skills & experience.

The objective of RBI is to determine inspection periods based on risks. If there is less historic data this will result in a higher risk (condition is unclear) and will automatically result in earlier inspections. RBI is possible without or with limited historic data.


Analysis example: Determine inspection interval (RBI)

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RejectedAcceptable

Risk assessment

Structural strength

TimeYear of

next inspection

Remaining lifetime

Today

Remaining lifetime assessment+ RBI What to do?

How much does it cost?


Dominant failure modes


• Is trending analysis carried out reliably?

Trending (1)

Reliable trending needs contect, not just measurements.


• 1960: tank built for storage of low sulphur diesel• 1995: service change for storage gas condensate. The tank pad was renovated and a

leak detection foil installed, resulting in a 10-year fixed inspection term.• 2005: Component inspected. Lots of rust observed on the tankfloor, remaining WT =

4,2 mm. Pits more than 2 mm are repaired by welding.Question: Is the trending reliable?

Trending (2)

New construction

Inspection

rejection

20051960 1995

8mm

4,2mm

2,5mm

2015

Long inspection term but is this

adivsable?

theory

High risk through uncertainty


• Older and solely time-based regimes are usely insufficiently covering the various degradations that are dominantly active on the tank.

• This leads to an increased risk on incidents/unforeseen events.

• Continuation of that procedure is expected to result in an increase of incidents and an increase of the required maintenance budget (‘fire fighting’).

• Risks can be controlled by a solid asset integrity approach. In time this will result in a decrease of incidents and a decrease of the maintenance budget.

• RBI is about ‘operating responsibly’

In general


• Visual external inspection following predefined checklist• Visual internal inspection following predefined checklist• Floorscan• 5 points per plate UT measurements tankfloor• Sagging• Edge settlement• Differential settlement• Scheefstand• Bulges and ripples in tankfloor• Annular toe thickness measurement• A-height cornerweld• UT crawler inspection tankshell• Manual UT grid tankroof• Manual UT nozzles + internal piping• Manual UT pontoons (bij EFR)

EEMUA offstream inspectie list

All critical components need to be checked for leading degradation mechanisms.


Closing the loop (PDCA)

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Component breakdown


Corresponding Inspection plan


IT

Maintenance and inspection


Closing the loop (PDCA)

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Component breakdown


Corresponding Inspection plan


IT

Maintenance and inspection


• RBI focuses on leakage or catastrophic failure

• RBI focuses on steel components

• RBI does not focus on functionality or operability of tank equipment

• PGS-29 has further requirements on this issue

• These are adressed in the equipment module

PGS-29 equipment


Equipment tool


Insulated tanks

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Component = insulated Shell

Degmech = CUI

CUI inspection plan

Analysis & secure in RBIT

API 581: Influencing factors assessment• Operating temp• Coating condition• Coating age• Cladding condition• Insulation type• Environment• External steam coil

• INCOtest is considered reliable above 8 mm remaining wallthickness with a small lift-off and no chicken wire in insulation.

• Crawler inspection can be used on the inside of the tank.

• Thermography for hotspots.• Visual external for condition of insulation

Suspect areas:•Remove insulation•Assess depth of damage using UT, pit gauge, profile comb•Use L-criterium to calculate equivalent wallthickness•Carry out fitness for service assessment•Define maintenance actions if needed


Riveted tanks

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Component = rivet rows

Degmech = creep and corrosion

Inspection plan


• Visual inspection for bleeding and corrosion


Product updater module

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Component = floor, shell,

roof, nozzles

Degmech = pitting and

gencorr

Inspection plan



RVS tanks

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Component = floor, shell,

roof, nozzles

Degmech = non-existent

Inspection plan


Inspection plan:•Essence is to confirm that no degradation is taking place•Scope is very small•Visual shoud be sufficientHowever: product stored should be fit for the tank material


Wind Girders

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Component = Shell

Degmech = Buckling due to windload

Inspection plan


Mean valuesfor wallthickness


• Sometimes classified as pressure vessel and sometimes as pipe

• When classified as pressure vessel a steam spiral falls often in a legal inspection regime

• When classified as pipe there is normally no legal inspection regime

• If inspection is mandatory, normally a pressure test is conducted every 6 years

Steam spirals


EEMUA 190•Soil settlement monitoring•Types of foundation•Inspection requirements•Design

Underground bullit tanks


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