Petrofac

sonalrach

Ain Tsila Development

Main EPC Contract

A-CNT-CON-OOO-00282

Sub-contractor Name:CERI

PIUL Approval Code/Name/Signature

Name:

Signature:

CODE DEFINITION

1 Accepted without comments

2 Accepted with comments

3 Not Accepted. Revise and

Resubmit

4 For Information
5 Void-Cancelled 1 Superseded

PROCEDURE FOR ULTRASONIC TESTING (UT)

A-QAC-PRO-730-38939

Re-Issued for Review &

B 5th Dec 2021 C.KHENFER RAHAL.I BOUDIB.T
Comments
Issued for Review & 06th Dec
A C.KHENFER RAHAL.I BOUDIB.T Name
Comments 2021
Rev Purpose Date Prepared Checked Approved Approved
 Procedure For Ultrasonic Testing (UT)
Document l\Jo: A-QAC-PRO-730-38939
Revision B

" " H"IS tory

ReVlslon
...,.,.
....I :~ - erlr
-­
lWl lt:'lle ~...

A Issued for Review & Comments

B Re-issued for Review & Comments

This revis ion checked and signed off by:

...
h'l~ litlllT.HI.111~

CHAFIK KHENFER WELOTEST PROJECT COOROINATOOR NOE LEVEL II

RAHAL IMEO WELOTEST NOE LEVEL JI

BOUDIB TARIQ ASNT UT LEVEL III ID : 283075

Holds
[).c. 1:It'. if.
.... .......
•• • ...
1 11:~""it'lil !l.!I!Iïl

Page 2 of 15
Petrofac
 Procedure For Ultrasonic Testing (UT)
Document No: A-QAC-PRO-730-38939
Revision B

CONTENTS
1 INTRODUCTION 4
2 SCOPE 4
3 REFERENCES 4
4 DEFINITION & ABBREVIATION 5
5 APPLICATION 5
6 PERSONNEL 5
7 EQUIPMENT 6
8 PROBES 6
9 COUPLANT 6
10 CALIBRATION BLOCKS 7
11 CALIBRATION AND SENSITIVITY SETllNGS 7
12 EXAMINATION 7
12.1 LAMINATION CHECKS 7
12.2 WELD INSPECTION 7
12.3 SIMULATION 8
12.4 RE-CALIBRATION 8
12.5 THICKNESS MEASUREMENTS 9
12.6 SURFACE CONDITION 9
12.7 Transfer correction 9
12.8 INSPECTION OF WELDS 9
12.9 EXECUTION 9
12.9.1 Scanning speed 9
12.9.2 Overlap 9
12.9.3 DEFECT SIZING AND ACCEPTABILITY 9

13 ACCETANCE CRITERIA 10
14 REPORTING 10
15 APPENDICES 10
15.1 Calibration block V1 FIGURE 1 and calibration block V2_FIGURE 2 10
15.2 DAC BLOCK _ FIGURE 3 11
15.3 TYPICAL DAC CURVE _ FIGURE 4 & TRANSFER CORRECTION_FIGURE 512
15.4 SCANNING FOR TRANSVERSE DEFECTS _ FIGURE 6 13
15.5 UT REPORT 15

~ ~~ Â
Page 3 of 15
Petrofac
 il
.onolrac~
Procedure For Ultrasonic Testing (UT)
Document No: A-QAC-PRO-730-38939
Revision B

1 INTRODUCTION
ln the frame of Ain Tsila Development Project, CERI was subcontracted for site Installation
and testing of LPG Storage Sphere (730-TK-03 A & B) and Off-Spec LPG Storage Sphere
(730-TK-03 C).

2 SCOPE
This procedure applies to ail welding ultrasonic examinations during Spheres erection, nozzles
and internai piping including ail safety requirements of materials . The extent of ultrasonic
examination shall be as specified by the applicable referencing Code Section, specification
and approved ITP.

3 REFERENCES

A-QAC-SPE-OOO-30001 : Specification - Welding Of Pressure Equipment

A-MTL -SPE-000-30004 Specification For Wet Hydrogen Sulphide (H2s) Service

A-MES-SPE-000-30107 Specification For LPG Storage Sphere

ASME Section VIII Div. 1 : ASME Boiler And Pressure Vessel Code Code - Rules
Ed 2019 For Construction Of Pressure Vessels
ASME Section VIII Div. 2 : ASME Boiler And Pressure Vessel Code - Rules For
Ed 2019 Construction Of Pressure Vessels - Alternative Rules
ASME IX Ed 2019 : Welding , Brazing , and Fusing Qualifications
ASME V Ed 2019 : Non Destructive Examination - Requirements And
Methods
ASNT-SNT-TC-1A 2016 Personnel Qualification & Certification in Non destructive
Testing
ISO 2400:2012 Non-destructive testing - Ultrasonic testing -
Specification for calibration block No. 1

Page 4 of 15
Petrofac
 Procedure For Ultrasonic Testing (UT)
Document No: A-QAC-PRO-730-38939
Revision B

4 DEFINITION & ABBREVIATION

Company SONATRACH (the operator of the Ain Tsila Development)

Contractor Petrofac International UAE Limited carries out ail or part of
the Design, engineering, installation and commissioning,
Procurement and construction applicable to this specification
Subcontractor CERI on whom the CONTRACTOR has placed a
Subcontract
Project AIN TSILA DEVELOPPEMENT PROJECT
CERI Compagnie Euro Africaine de Réalisations Industrielles
QC Quality Control
WPS Welding Procedure Specifications
PQR Procedure Specifications Records
NCR Non Conformance Records
QAJQC Quality Assurance/Quality Control
RFI Request For Inspection
ITR Inspection Test Record
IM&TE Inspection Measuring & Test Equipment
NOE Non-destructive Examination
ASNT American Society of No destruction Testing
UT Ultrasonic Testing
NOT Non-destructive Testing
NPS Nominal Pipe Size

5 APPLICATION

The purpose of this procedure is for ultrasonic examination of production welds including
lamination examination and thickness measurements.

6 PERSONNEL
The examination and evaluation of indication shall be done by NOT Level Il or III operators
certified according to employers written practice in accordance with SNT-TC-1A level Il or
approved equivalent as accepted by Client.

Page 5 of 15
Petrofac
 Procedure For Ultrasonic Testing (UT)
Document No: A-QAC-PRO-730-38939
Revision B

7 EQUIPMENT
Examinations shall be carried out manually using the pulse-echo method with direct contact
coupling, the ultrasonic instrument shall have 'A' scan presentation with a well-defined trace to
measure both range and amplitude It may also have an optional function showing a numerical
digital display read-out to simultaneously show thickness/beam path/or % skip trigonometric
values.
Ultrasonic instruments shall be capable of working at test frequencies between 1 to 5 MHZ
Ultrasonic instruments shall be validated by client (or calibrated) annually to assure
performance to manufacturing tolerances.

Ail equipment shall be calibrated and labeled according ASME V article 5, using a reference
block for calibration according ISO 2400.
The maximum temperature difference between the Probes/Blocks used during calibration
and the test surface shall not exceed 15°C.

8 PROBES
Different type of probes may be used, depending on thickness and weld geometry, Surface

condition, Material Thickness, Material grain structure & attenuation, Test coverage required ,

Defect type/size/orientation.

Probes will be assessed daily. Compression probes shall be capable of producing at least 3

separate backwall echoes from the V1 calibration block when the first echo is at full screen

height.

Straight beam probe (21 10 mm frequency 5MHz

Straight beam probe 0 24 mm frequency 4MHz

Angle beam probe 8x9 mm angle 70° frequency 4MHz

Angle beam probe 8x9 mm angle 60° frequency 4MHz

Angle beam probe 8x9 mm angle 45° frequency 4MHz

Angle beam probes shall be checked for index point and beam angle. If the angle of incidence

deviates more than 2° from the normal value, then the probe will be replaced.

High temperature probes shall be used above 70°C. Temperature difference between the

calibration block and examination surfaces shall be within 25°F (14 oC).

The actual probes used during the inspection must be recorded on the test report.

9 COUPLANT
The coupling medium to be used shall be chosen to suit the test surface conditions, profile &

temperature.

For temperatures between ooe - 40°C a mixture of cellulose and water or Sound safe will be

used .

Sound safe will be used for temperatures between 40° to 150° C.

During examination of welds, the same couplant shall be used as which was used during

calibration of equipment.

The couplant shall not be used detrimental to the test surface.

Petrofac @A.
~'RJ ... ..•.
Page 6 of 15
 Procedure For Ultrasonic Testing (UT)
Document No: A-QAC-PRO-730-38939
Revision B

10 CALIBRATION BLOCKS
As reference calibration block, the V1 or V2 calibration blocks shall be used as given in Figure
1 and 2.
For establishing sensitivities, a basic calibration block in accordance with DNV OS-F101
Appendix D, B 300 series (as given in figure 3) shall be used. Basic calibration block shall be
made from the project specific mate rial.

11 CALIBRATION AND SENSITIVITY SETTINGS

The time base shall be calibrated using the V1 or the V2 calibration block.

Prior to the start of the examination the horizontal and vertical linearity of the equipment shall

be checked in accordance with BS 4331 . Probes will be assessed daily.

11.1- Sensitivity and Range Corrections:

General: Setting of range and sensitivity shall be carried out prior to each testing in accordance
with this International Standard and EN 583-2, taking the influence oftemperature into account.
The temperature difference during range and sensitivity setting and during the test shall be
within ±15 oC .
11.2- Test range & sensitivity shall be verified prior to each examination and reconfirmed
at the following stages:
At least every 4hrs during testing

Any change in equipment

Any change in the test parameters

Where changes in the equivalent settings are suspected

At the end of each inspection

12 EXAMINATION

12.1 LAMINATION CHECKS

The sensitivity shall be set by placing the probe on a defect free area of the material and
adjusting the 2nd back wall echo to 75 % (+/- 5%) of full screen height.

12.2 WELD INSPECTION:

12.2.1- Parent Metal Scan:

Prior to the examination of the weld the parent metal either side of the weld, where
accessible, shall be examined using 0° compressional waves over a distance of 100 mm from
the bevel. This test is to locate any laminar type defects in the parent metal, which will interfere
with or restrict the subsequent weld examination .
The parent metal scan sensitivity shall set at 2nd Back Wall Echo (BWE) to Full Screen
Height (FSH) .
Scan coverage shall include the entire area of parent material that will undergo a shear
wave interrogation . That extent is equal to the ~ or full skip distance plus ~ the weld

Page 7 of 15
Petrofac
 Procedure For Ultrasonic Testing (UT)
Document No: A-QAC-PRO-730-38939
Revision B

cap width plus 10mm heat affected zone.

The skip distances are calculated for the shallowest angle probe to be used and the

choice of % or full skip is dependent on whether access for scanning is from one side, or from

both sides of the plate.

Skip distance can be calculated as shown and be used to confirm the extent of parent

metal scanning required .

12.2.2- Weld Metal Scans:

The sensitivity shall be set du ring the construction of the distance amplitude correction curve
(DAC).
Distance amplitude correction curves shall be constructed using the cal ibration ho les in the
applicable basic calibration block and shall be set up as follows :
The block width shall be a minimum 40mm and the length sufficient to obtain full skip. Minimum
3 echoes shall be used for every DAC. As shown in Figure 4 , the sound path from point A to
reflector shall not be less than 0,6 N where N is the near field length of the probe.

The echo height from position A shall be maximized and the gain control regulated so that the
echo height is 75% (+/- 5%) of full screen height. This gain setting is ca lied the primary gain
and shall be recorded. Without altering this gain setting, the maximized echo height from points
Band C shall be plotted on the screen.
The reference curve is now to be drawn as a smooth line through the three points. Curves
being respectively 20% and 50% of the reference curve shall also be constructed.

12.3 SIMULATION
When the sensitivity has been established, this sensitivity may be correlated to the drilled hole

in the V1 or V2 block, plus any applicable transfer correction .

During the operation on site the V1 or V2 block will be utilized to confirm the operational

sensitivity if necessary.

12.4 RE-CALIBRATION
At the end of the examination, or every four hours, or change of operator, and whenever a
malfunction of the equipment is suspected, calibration must be checked. Re-calibration shall
also be done if any part of equipment is changed or replaced or equipment switched on-off.
If a point on the DAC has increased more than 2 dB of its amplitude, ail recorded indications
since the last check shall be re-examined with the corrected calibration. If a point on the DAC
has decreased more than 2 dB of its amplitude , ail examination covered since the last
calibration shall be Re-examined with the corrected calibration .
ln addition to this, a daily control shall be done in the following way . Indication set at 80% FSH
then decrease the amplitude -12 dB with the dB control. Obtained indication limits 16-24% of
FSH. If indication is outside the Iimits, the instrument shall be removed from use. This shall be
logged daily by operator.

Page 8 of 15
Petrofac
 Procedure For Ultrasonic Testing (UT)
Document No: A-QAC-PRO-730-38939
Revision B

12.5 THICKNESS MEASUREMENTS

As reference, the V1 or V2 calibration blocks shall be used (reference is made to Figure 1 &

2).

The time base shall be calibrated to enable a minimum of five back wall echoes from the

sarnple to be displayed . For better accuracy, calibration and wall thickness readings will be

between the first and fifth back wall echoes.

12.6 SURFACE CONDITION

The contact surface of the material shall be free of any weld spatter or other substance, which
might impede the transmission of ultrasound to the material.

12.7 Transfer correction

The primary gain shall be corrected for difference in surface character and attenuation between
the reference block and the actual pipe by means of the double probe technique. Two identical
angle probes, facing each other one skip distance apart as shown in figure 5 shall be used.
The primary gain shall be corrected accordingly and then become the corrected primary gain.
The gain correction necessitated by such difference shall be at most 6 dB.

12.8 INSPECTION OF WELDS

The welds shall be examined in such a manner that the entire weld volume is scanned. Where
100 % weld examination is required, the method of scanning for transverse defects is given in
figure 6.
The scanning sensitivity is the corrected primary reference level (DAC+any applicable transfer
correction) + 6 dB, discontinuities however, shall be evaluated using the corrected primary
reference level.

12.9 EXECUTION

12.9.1 Scanning speed

The rate of probe movement for examination shall not exceed 100 mm/sec.

12.9.2 Overlap
Each pass of the probe shall overlap a minimum of 15% of the transducer (piezo electric
element) dimension perpendicular to the direction of the scan .

12.9.3 DEFECT SIZING AND ACCEPTABILITY

Defects will be sized for dimensional evaluation using the 6 dB drop or maximum amplitude
methods.

Page 9 of 15
Petrofac
 Procedure For Ultrasonic Testing (UT)
Document No: A-QAC-PRO-730-38939
Revision B

Only indications with an echo height of 20 % DAC and above will be investigated to their nature

and extent. Acceptance criteria for manual LIT are based on ASME V"I Div. 2.

/\ny indication of crack like nature will be itlllïleûi8l~ly r~fJurled lu the client's representatlve,

regardless of echo height. A" indication with amplitudes of 50% FSH or above sha" be reported

with minimum details as given below. A" areas starving drop of back wall echo to less than

50% of FSH sha" also be investigation and reported .

13 ACCETANCE CRITERIA
Acceptance criteria sha" be as per ASME V"I Div2. Parg 7.5.4

14 REPORTING

Llpon completion of the examination, a Non-Destructive Examination Report sha" be submitted

containing at least the fo"owing information:

a) Client's name, reference and project

b) Project nr" Equipment ID, weld ID & length. For WPQ or WQT also welders stamps. and
report number
c) Date of examination
d) Non-Destructive Examination procedure and acceptance criteria reference
e) Type of test equipment, probe type, frequency, angle and brand name (for high
temperature probes, temperature range) and consumables
f) Results of the examination
g) Details of a" reportable and/or unacceptable indications (dimension, location and nature).
h) Data of exarnination, surface condition, area to be examined, test location, surface
temperature at time of test.
i) Examiner's name and signature and approval level.
j) Pipe diameter and thickness, and material grade

15 APPENDICES

15.1 Calibration block V1 FIGURE 1 and calibration block V2_FIGURE 2

Petrofac Qj,&
~ERI .••....•.
Page 10 of 15
 Procedure For Ultrasonic Testing (UT)
Document No: A-QAC-PRO-730-38939
Revision 8

._--------..
1": «m ul',~
..;.;-. ~~, .
. - - - -....

:-- . -po
~
1
~' l , l, l, l, r, l , l, l', l, ,.., 1":', , l, l ,,] ,Id, l, l, P.

Î , ,
,

\ ./
V1~

7';:11 ?~I ~;t 0

-

I!
\1: •••
"­

!-if.l.rH 1 CHI ~rHli()f" t:IO(:-I. V·

2~ .S

/ '; '.1

_1 v~_1 ___ n-5~~__ ,~

/
- ··i~I<:·;;Ii~ =12.5 u' le
Il'-~~NlP. ''),,-~r-1 ~ <II S
"'1I31~;' l,r"l.

Figure 2. C;;,librCltion block \-'2

15.2 DAC BLOCK FIGURE 3

Page 11 of 15
Petrofac
 Procedure For Ultrasonic Testing (UT)
Document No: A-QAC-PRO-730-38939
Revision B

'-i!lJ.~~
-t..•...__._-._­­ V2

3V4 -'l-' ~lTlm

orl
_ .. .. .. .­
~_ _ _ _ _ _~_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _L

...!
rnininHJm
38 mOl

40 mm
10
100mm

Lenglh $t.ilahIH ror U"l'P. sound bP.~rT1 palh ror ail rnlb (~ Iype~ i'J nd lhf"! rnalf·ui;.11 on~ngjuns 10 bH lf'$Ip.d

Diameler of side drilled hales la be 3 mm.

Figure 3: DAC block

15.3 TYPICAL DAC CURVE FIGURE 4 & TRANSFER CORRECTION_FIGURE 5

Petrofac &.L!~ A Page 12 of 15

 Procedure For Ultrasonic Testing (UT)
Document No: A-QAC-PRO-730-38939
Revision B

f:>Jll/'l

L - As long as neecec, d6\>e:rdh);: on 3w(dpatl1 length in tellt

li., • Angle of rcrr:tdion.

Transmitter Receiver

Reference black

Transmitter Receiver

Malerial under examination

A = Difference (xdB.)
owing 10 difference
in surface and
allenualion.

Figure 5: Transfer correction

15.4 SCANNING FOR TRANSVERSE DEFECTS FIGURE 6

Page 13 of 15
Petrofac ~A,.~
~ERI ..." •.
 Procedure For Ultrasonic Testing (UT)
Document No: A-QAC-PRO-730-38939
Revision B

\Veld width

SI-ŒAR \\lAVE UL'ffiASOKIC SCA'lNI~G PATIERN

TO LOCl\TE TR1\ NSVERiΠDEFEL"TS

Figure 6: Scanning for transverse defects

Notes:
1) Direction of probe movement parallel to weld axis
2) Scanning to be carried out on both sides of weld
3) Probe oscillation through 10 0 during movement along
4) Use 45 0 and 60 0 probe angles.

Page 14 of 15
Petrofac
 Procedure For Llltrasonic Testing (UT)
Document No: A-QAC-PRO-730-38939
Revision B

15.5 UT REPORT

~U9JU INSPECTION & T!i;ST RECORD-WElOING

ITR No: W-9112X
Petrofac ~tJ
~~b.
Il
1000Drraef'l 1
ULTRASONIC INSPECTION REPORT
PECOU·ITR-X-16413 Rev 0

W-01 12X
Sub Contractar Code

1 1 1
1

1 1

PlantlUnlt: 1 ProJect No.: Record No.:

Orawlng No.: 1 Rev. No.: 1 SystemlSub·system No.:

Procedure No.: Rev. No.: Speclncatlon: Acœptanco Criteria & EdltJon;

UT Instrument
ktentfficatlon JMake: Model : Seriai Number: Couplant us.ed (Brand Name or Type):

Spoclal Equipmonl. whon uso<J (Soan:h

ComputOl pfog.-am
Soilrch Unit (a) kklntlficBUon
Soarc.n Unit (Il Cablo Callbutlon data [lnslrumont rohlronco Jovol gain unitt., wodgos. Shoos.. AulomaUc
Idcn(iflcoUon and rovillon
(I)usod and, damplng and roJod .attlngs If usodl Sunnlno oqulpmont.. According
whon usod
scannlng oqulpmonl ole .)
.um Roloronœ IndIcation Dlstanco
"",1.
$o"gl NO. Froquoncy S... Typo Long1h
ronOClor(li) amplitudo (.) Rlad!ng (s)

O'
,.­
...
,..
Data correlatJng slmulallon bloek (5) and etoruonle slmu'ator{s). who"
IdentJf1callon;
uscd, wllh InlUal callbrallon
Simulauan
C:lUbraUon Block ID Elocltonic shnulltot(s)
Block (sI
V1 ASUE SOH Bloçk lh1cknClU _ mm -
V2 Roforonoa Rolloctor: SOH mm dl. -
Subcontractor QC
Record Acceptance vrvac Pctrofac QC Company

Name

Signature

Date
pago 1 012 Rcl. ITP No.; PEC.QlJ.ITP-X-l0821

Page 15 of 15
Petrofac