Document No: RUSL-PADMA-2016-06 RUSL-PADMA-2016-06
Employer:
Gas Gas Trans rans#i #iss ssio ion n Co#p Co#pan any y i#i i#ite ted d
!GTC" Contractor: China
Petroleu# Pipeline )ureau
!CPP" The The Ro Roya yall 4t 4til ilis isat atio ion n /er& /er&ic ices es !P&t6" td6 !R4/" Radiographic Test Procedure
Sub-Contrac Sub-Contractor: tor:
for Construction of 30” OD High Pressure Natural Gas Pipeline by Horiontal Directional Drilling !HDD" #ethod across the P$D%$ Ri&er under Hati'u#rul ( )hera#ara Gas Trans#ission Pipeline Pro*ect on Design+ ,nstallation+ Testing+ Testing+ Tie-in . Co##issioning basis
/ub#itted by TH1 RO2$ 4T,,/$T,ON /1R5,C1/ !P5T6" TD6
CONTENTS 1.0
Scope....................................................................................................................... Scope....................................................................................................................... 2 ..
2.0 General......................................................................................................................... 2 4.0 Image Quality Indicators......................................................................................... ...
.0 !adiograp"ic #ilm............................................................................... .......................$ $.0 !adiograp"ic %a&ings.............................................................................. .................' '.0 !adiograp"ic %a&ings.............................................................................. .................' (.0 )iagnostic #ilm *engt"........................................................................................ ......' +.0 #ilm ,rocessing.................................................................................................... ...... ( 10.0 ,ersonnel Quali-ication.................................................................. .........................( 11.0 cceptance Criteria -or /elds............................................................................. ....+ 12.0 Test o- !eor& or !eplacement %aterial............................................ .................10 1.0 !eports....................................................................................................................1 0 14.0 !ecords....................................................................................................................1 1 1.0 !adiation Sa-ety................................................................................................... ...1 1 ,,EN)I3.....................................................................................................................12
1.1Scope 1.2 This procedure provides methods, equipment, materials and acceptance standards for the radiographic examination of weldments of Installation of 30” ! "igh #ressure $atural %as pipeline &' "ori(ontal !irectional !rilling )"!!* +ethod across the #adma iver on !esign, -uppl', Installation and commissioning on Turne' /asis ontract $. 2.1.0000.14.03.03.14.25 !6T78 129019201 of ##. It conforms to the requirements of 6-+7 -ection :, 6$-I /31.1 thru /31.; and 6#I110.
This procedure will &e utili(ed to examine steel, copper allo's, high nicel allo's of 14.5mm or a&ove of martial thicness.
1.3
6lternative specifications to the a&ove ma' &e used when so requested &' the customer. If #age 1 of 11
alternative specifications are used, the radiographic procedure will &e performed in accordance with that specification.
2.0 General 2.1
adiographic examination provides for the detection of cracs, voids, porosit', inclusions, inadequate penetration and lac of fusion &eneath the surface of a weld.
2.2
The num&er of areas or parts to &e radio graphed shall &e specified &' contract and related drawings
2.3
2.
adio graphing dou&le walled parts such as piping, ducts, with a radiation source outside the pipe, the pentameter>I
2.4
adiographic personnel shall &e certified in accordance with section B of this procedure.
2.
adiographic personnel performing radiograph' will compl' with local adiation -afet' egulations.
2.;
adiation sources will &e radioactive isotopes for repair, Ti9in and C
2.
omplete records of technique details for each pipe si(e shall &e approved &' client and maintained &' +IB as permanent record for use on production radiographs.
.0 Inspection !euirement 3.1
ondition of +aterial8 6s per 6#I 4D B0)#-D92*
3.1.1 Irregularities E the area to &e examined shall &e free of an' of irregularities, which could interfere with interpretation. Celd ripplesF edges, or weld surface irregularities are allowa&le to the extend that, the' do not mas defective areas or interfere with the radiographic interpretationF weld edge will &e &lend smoothl' into the &ase flush with the &ase metal or ma' have a reasona&l' uniform crown not to exceed the following thicness8 Thicness of /ase +etal Gp to 12.4mm ver 12.4to 24.mm 3.2
Thicness of einforcement 1.4mm 2.3mm
adiographic Technique $!T 7ngineer shall qualif' each technique &' su&mitting to the clientHs engineer a production radiograph or technique shot to demonstrate their a&ilit' to #age 2 of 11
meet the sensitivit' and film qualit' levels for each technique. 3.3
@ilm and Image
3.
@ilm
3.4
adiographs presents for interpretation shall &e free &lemishes of film defects that might mas or &e confused with defects in the material &eing examined. If dou&t exists concerning the true nature of an indication in the film, the radiograph shall &e reAected. T'pical &lemishes are as follows8 @ogging, mechanical processing defects, pressure or lead mars, scratches, gouges and crimp mars. !arroom @acilit' !arroom facilities shall &e capa&le of producing uniform, &lemish free, radiographic negatives. @ilm viewer, densitometer, transparent scale, magnif'ing glass will &e provided to clientHs dar room.
3.
@ilm :iewing @acilit' :iewing facilit' shall &e so constructed as to afford the exclusion of o&Aectiona&le &acground lighting of an intensit' that ma' cause reflection on the film.
3.
:iewing Dight 6 viewing light will &e provided such intensit' and &e suita&l' controlled to allow the selection of optimum intensities for viewing film. The viewing light will &e cooled to the extend that film emulsion will not &e damaged during the viewing.
3.
adiation -ource 7ither B9a' internal crawler contains a B9ra' generator which will emit a #anoramic &eam of radiation, +ax volt9200v, +ax. urrent93m6,)@ig &ellow*or %amma a')I9 152*Isotope will &e used for carr'ing out main pipe line welds Tie9ins and repair. adiographic examination with Ir9152,curie strengths up to 100 curies will &e used on thicness of .3 to 3.4mm.#h'sical source si(e will &e a maximum 3.1J3.1mm.
#age 3 of 11
3.5
-creen and @ilters @ront and &ac lead foil intensif'ing screens with a minimum thicness of 0.10mm and 0.124mm respectivel' shall &e used for low energ' radiograph'. omplete contact &etween screen and film shall &e maintained. -creen shall &e free from dents, scratches, grease, dirt and other foreign material.
3.10 /ac9-catter 6 &ac9scatter condition is not accepta&le. To esta&lish existence of &ac9scatter, affixed to the &ac of each cassette shall &e a lead letter ?/” if this is visi&le on processed film, a new exposure must &e made with adequate lead shielding. 6 3.1;mm lead filter shall &e placed &ehind the film holder to prevent fogging of film &' scattered radiation.
4.0
Image Quality Indicators
.1
equirements Image
.2
$um&er 6s per 6#I 110 clause no.11.1..1, when a complete weld is radio graphed in a single exposure using a source inside the piping, at least four pentameters placed parallel to the weld and spaced approximatel' equall' around the circumference shall &e used.
.3
onfiguration I
.
Identification Image
#age of 11
.4
#lacement of I
.
6lternative #lacement If the I
.;
-eparate /loc The I.<.I ma' &e placed on a separate &loc of a radio graphicall' similar, placed as closed as possi&le to the area &eing radiographed. The film densit' of the &loc shall &e within plus or minus 10= of the film densit' in the area of interest of the radiographed &eing examined.
.
Technique 7xposure Technique exposure will &e provided upon request of the <6 +anager. I
.5
I.<.I -ensitivit' adiographic sensitivit' shall &e as per the requirement of 6-+7 :. alculation of sensitivit' for !C-I shall &e &ased on the thicness of one wall onl', whereas calculation for !C!I shall &ased on the com&ined thicness of &oth walls.
.0
!adiograp"ic #ilm
4.1
The film used conform to 6-T+ 75 classⅠorⅡ.!epending upon application to o&tain the qualit' and sensitivit' all film shall &e dated and &e utili(ed prior to the self9life expir' date. @ilm t'pes to use shall &e limited to t he following8 a* &* c* d*
6gfa9%evaert -tructurix t'pes !; Indux9; industrial B9ra' @ilm oda T'pes 66900 @uAi 100
@ilm si(e will &e ;0mm wide and approx.0 inch length for panoramic exposure. #age 4 of 11
4.2
Identification and +aring of @ilms and &Aects Dead identification marer shall &e placed on all sections &eing radiographed .+arers shall &e placed on the source side of the o&Aect &eing radiographed except as otherwise approved &' the qualit' 6ssurance +anager and placed in such a manner that all overlapped to &e placed on the film side, the technique shall &e such that sufficient film overlap is provided to ensure complete coverage of the full section thicness due to angularit'. There shall also &e an identification on each film showing the contract num&er, vendorHs name or s'm&ol, date, seam, weld, or par num&er of the component &eing radiographed. Detter ?” plus repair num&er shall identif' repair.
$.0 !adiograp"ic %a&ings .1
omponent #ermanent +aring The location of identification marers shall &e accuratel' made n each component tested, &' permanent maring on the &ase meta, adAacent to the weld &ut outside the heat affected (one, &' one of the following methods8 a. 7lectro9chemical etch &. :i&ro9tools c. Interrupted dot9low stress stamps d. Caterproof indeli&le cra'on or d'e marings
'.0 !adiograp"ic %a&ings ;.1
-ingle wall adiograph9pen en component Chen the diameter of and access to the component is such that, the source of radiation can &e located inside, without deviating from good source to film distance and sharpness practices, the cassettes shall &e placed at the outer surface of the pipe component.
;.2
adiograph' without 6ccess "ole Chen no access hole is provided, nor otherwise availa&le in a component, the source of radiation shall &e placed outside the component and the technique shall &e in conformance with the requirement for !ou&le Call radiograph' -ingle wall viewing.
;.3
!ou&le Call adiograph9omponents Dess than three inch !iameter !ou&le wall exposures for dou&le wall image viewing)!C!I* ma' &e emplo'ed for component diameters less than three inch, this technique will &e used in which radiation passed through two walls and the weld in &oth walls s viewed for acceptance in same radiograph .@or !C!I technique onl' a source side I
(.0 )iagnostic #ilm *engt" .1
The length of component under examination at each exposure shall &e such that, the thicness of the material penetrated at the extremities of the reada&le area, measured #age of 11
in the direction of the incident &eam at that point, generall' does not exceed &' more than 10=.The actual thicness where the &eam is aligned normal to the part, with the exception of !C!I technique. .2
$um&er of exposures
.3
a* -C-I )#anoramic* Technique8 ne exposure with film overlap to &e at least1” &* -C-I )ff9set* Technique8 6t least 3 equidistantl' spaced exposures with minimum overlap of coverage to &e 1”
.
!ou&le Call -ingle Image )!C-I* Techniques num&er of exposures will &e as follows8 a* @or wall thicness schedules up to 100 a minimum 3 equidistantl' spaced requires, with minimum overlap of coverage in the diagnostic area to &e 12.4mm. &* @or wall thicness schedule over 100 a minimum of equidistantl' spaced exposures required, with minimum overlap of coverage in the diagnostic area to &e 12.4mm. !ou&le Call !ou&le Image )!C!I* 7lliptical8 minimum no of exposures will &e 2, at 50Kto each other.
.4
.
!ou&le Call !ou&le Image )!C!I* superimposed8 +inimum num&er of exposures to &e 3 at 0Kapart.
+.0 #ilm ,rocessing 5.1
6ll exposed films shall &e developed utili(ing the rapid manual processing technique. !eveloping time to &e 94 minutes in a temperature range of 1922 ℃ . @ilm shall &e agitated for 10 seconds each minute during development. This will help film develop evenl'.
5.2
@ollowing !evelopment, the activit' of developer in emulsion shall &e neutrali(ed &' an acetic acid stop &ath for maximum 1 minute agitation for first 10 seconds
5.3
@ilms will &e fixed for at least twice the clearing time with an agitation for 10 seconds and again at the end of first minute.
5.
Cashing will &e for at least 10 minutes in running water.
5.4
@ilms shall &e dipped in wetting agent for 1 minute.
5.
@ilms shall &e drained then hung and dried.
10.0 ,ersonnel Quali-ication 10.1
#ersonnel performing and interpreting radiographic examinations shall &e qualified in accordance with 6-$T9T916 or I- standard
10.2
6s a minimum all personnel conducting radiographic test shall &e certified to Devel91
adiographic test will &e performed under supervision of level9 Ⅱ or equivalentl' qualified supervisor. 10. Interpretation of radiographs shall &e carried out &' Devel9Ⅱ qualified personnel. 10.3
#age ; of 11
10.4 6ll qualification certificates shall &e current.
11.0 cceptance Criteria -or /elds adiographic films will &e interpreted as per 6#I9110 and %TD contract specification, however where confusion ma' arise the following also &e applied 11.1 Gnaccepta&le !efects Gnless otherwise specified in materials specification or contractual documents, sections of welds that are shown &' adiograph' to have an' of the following t'pes of defects are unaccepta&le. a. 6n' t'pe of crac or (one of incomplete fusion or penetration. &. 6n' elongated inclusion such as slag or tungsten, which has c. Dength greater than .3mm for t up to 15mm 1>3t for t from 15mm to 4;mm 15mm for t over 4;mm )where t is the thicness of the thinner part &eing welded* 11.2 6n' group of inclusions in line that have an aggregate length greater than t in length of 1.2t, except when the distance &etween the successive imperfections exceeds D, where D is the length of longest imperfection in the group. 11.3 #orosit' in excess of that shown accepta&le &' the porosit' standard given 6-+7 -ection Ⅷ )!ivision 1*. 11. Celd conditions %enerall' Gnaccepta&le a. rater pits &. 6r -tries c. Celd -platter d. -urface maring resulting from mishandling center punching e. Incomplete insert melting f. /urn9through 11.4
11.
6cceptance riteria emplo'ed for evaluation of welds in progress piping shall &e as per Ta&le 31.3.2 of 6-+7 /31.3 $ormal fluid condition or severe c'clic condition depends on operating condition 6cceptance riteria emplo'ed for evaluation of welds as per 6-+7 -ec Ⅷ !ivision91 shall &e as follows8 a. 100= adiograph'9GC41 &. -pot adiograph'9GC42
11.;
6cceptance riteria emplo'ed for evaluation of welds of -teel structure shall &e as follows8 a. 6C- !1.1.200
11. 6cceptance riteria emplo'ed for evaluation of welds of %as pipe line shall &e as follow8 a. 6#I 110
12.0 Test o- !eor& or !eplacement %aterial 12.1
+aterials that are shown &' the radiographic method of examination to &e reAected and su&sequent rewor or replacement shall &e done again su&Aect to the same approved #age of 11
radiographic testing in order to meet the acceptance requirements. 6 minimum amount of overlap of 40mm &e'ond the repair edges shall &e used. 12.2 epairs Gnaccepta&le defects ma', upon approval of clientHs authori(ed representative, &e repaired provided8 a. The minimum remaining wall thicness is not reduced &elow the minimum value required &' specification. &. 6fter the defect is removed and prior to maing repairs, the area shall &e re9 examined and if no welding is required, the depression is &lended into the surrounding surface to avoid sharp notches, crevices or corners and should &e to 91 taper. c. 6fter the area has &een repaired and in the final heat treat conditions, the area shall &e re9examined &' radiograph' and &' all other $!T methods of examination that were originall' to detect the defect.
1.0 !eports 13.1 Critten reports of all radiographic examinations shall include ,&ut not limited to the following items8 a. Identification of parts, materials or area, wall thicness, diameter &. The adiographic Lo& num&er c. The findings and disposition d. $ame of the radiographer e. $ame of the interpreter f. T'pes of adiation -ource g. #entameter>I
14.0 !ecords adiographic reports shall &e preserved and held for minimum, period of three 'ears after completion of the Ao&. 6fter films will &e preserved of suita&le atmosphere and handed over to the cline after completion of the wor.
1.0 !adiation Sa-ety -afet' M -ecurit' a. 6ll technicians shall wear a TD! and a pocet dosimeter during radiation wor &. The' should have a cali&rated radiation surve' meter. c. The area where the radiation wor is &eing performed shall &e cordoned off to prevent unauthori(ed entr'. d. 6fter complete of wor isotope should &e ept at storage pit under loc M e' e. ollimator will &e used speciall' where adiograph' will &e undertaen &' gamma a'. f. 6ll regulations and specifications approved &' /angladesh 6tomic 7nerg' commission will &e followed.
#age 5 of 11
