Visual Thread Inspection SOP

State Energy Inspection Services Standard Operating Procedure Visual Thread Inspection

1.0

Instruction # 11.0 Page 1 of 6 Effective Date 12/19/09

Manual SOP Revision 1 Approval Signature

Scope

The requirements of this procedure shall be folloed hen Visual Thread Inspection is specified on the State !ner"#$s or% order& This procedure details requirements' equipment and procedures for (isual thread inspection of round and buttress threaded connections& Inspection co(ered in this procedure are)  Internal couplin" threads  !*ternal field end threads 1&1 1&1

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Personnel !u !ualification

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Pers Person onne nell perf perfor ormi min" n" this this proc proced edur uree shal shalll be class classif ifie ied d as a mini minimu mum m' -e(e -e(ell I Visual Thread&

2&2

-e(e -e(ell I threa thread d inspe inspect ctor orss shall shall be unde underr the the super super(i (isi sion on of an on on site site -e(el -e(el II or or -e(el III super(isor&

2&.

Pers Personn onnel el perf perfor ormi min" n" Visu Visual al Thre Thread ad must must be able able to dist distin in"u "uis ish h 1 lette letters rs at 12 inches on a ea"er e#e chart and ha(e no color (ision impairment&

Reference Do Docuents

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Thr Thread ead repa repaiir is not not par part of the the proc proced edur uree and and ill ill onl# onl# be perf perfor orm med hen hen specified b# the +ustomer& ,inor din"s' burrs' etc& ma# be repaired in the non -c len"th and time spent ill be limited&

The follo folloin" in" docu documen ments ts are are refe referen renced ced in in prepar preparati ation on of this this proced procedure ure and should should be a(ailable on the ob site location&  PI Spec +T  PI Spec 3  PI 4P   PI 4P 31  +ustomer specification' as applicable

Definitions

5&1

4efere 4eference nce 4P 4P   and and 4P 31 for defini definitio tions ns of of ordi ordin" n" used used in this this proced procedure ure&&


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E&uipent

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!quipment used in this procedure consists of the folloin"& a Steel ruler ith "raduation of 1/.2 inch b Thread profile "a"e c Thread dressin" tools' if required

(leaning and Preparation of )*reads

6&1

4emo(e thread protectors and stac% for cleanin" prior to reappl#in" to the threads&

6&2

Threads must be clean before inspection& ll traces of thread compound' dirt' scale and other forei"n material must be remo(ed& +lean pins ith brush and sol(ent& 4emo(e an# seal rin"s from modified couplin"s prior to cleanin"& 3lo sol(ent out of the threads ith hi"h7pressure air&

6&.

ppl# a sequential number near the couplin" end of each len"th of pipe to be inspected&

6&5

8hen rollin" pipe ithout thread protectors care should be ta%en to a(oid impact that ma# cause mechanical dama"e to the threads&

6&

-i"htin" intensit# shall be 0 foot candles or "reater at the inspection surface or under natural li"htin" conditions&

,isual Inspection of Round and -uttress )*reads +.1

(riteria for Round )*read (onnections a These inspection requirements appl# to round threaded connections' upset and non7upset in sies 2 ./:; throu"h 20; diameter& b 4eference
>?pin bearin" face !*amine for) 1& The presence of a %nife7ed"e& 2& 3urrs on either the internal or e*ternal surface& >?chamfer !*amine for) 1&  feathered"e 2& 3urrs


Instruction # 11.0 Page . of 6 Effective Date 12/19/09


.& +hamfer not present a full .600 around the circumference& 5& ?-c thread len"th !*amine for) 1& n# imperfection or distortion of the thread form' hich ill produce a lon"itudinal or helical lea% path& 2& 3lac% crested or flat crested threads& .& n# imperfection that penetrates throu"h the crests into the matin" flan%s of the threads& 5& n# imperfection that (isibl# bul"es the flan%s or results in a protrusion of metal from one or more threads& & n# other imperfection' hich mi"ht affect the sealin" capabilit# of the threads& 6& +orrosion pittin"& >?non -c len"th !*amine for) 1& n# imperfection e*tendin" from the crest to the root of the threads or an# imperfection hose depth e*ceeds 127@A of nominal all thic%ness measured from the proected pipe surface& 2& n# metal protrusion that ma# pre(ent proper ma%eup or peal the protecti(e coatin" of the couplin" threads& >? area !*amine for) 1& Threads not e*tendin" to the center of the couplin"& These threads are non7en"a"ed threads and need not be perfect& >?internal couplin" threads !*amine for) 1& ll internal couplin" threads are considered to be -c threads and shall be inspected usin" the same criteria used for the e*ternal threads& >?couplin" bearin" face !*amine for) 1& n# metal protrusions that ould pre(ent proper ma%eup& 2& n# feather ed"es& .& n# mashes or din"s& >?couplin" ma%eup !*amine for) 1& +ouplin"s should be chec%ed for proper ma%eup usin" a tolerance of ?B/7 2 thread turns ?&20; from nominal ma%eup position& +ouplin" ma%eup is measured from the end of the couplin" to the face of the pipe inside the couplin"& The formula for determinin" nominal ma%eup position is ? actual couplin" len"th ?C- di(ided b# 2 plus the  dimension  2& +ouplin" ma%eup on round threaded material is not an PI reectable condition& Doe(er' if the measured distance is "reater than ?B/7 2 thread turns from nominal ma%eup the condition should be reported to the customer&




igure 11/1  Round )*read 

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(riteria for -uttress )*read connections a These inspection requirements appl# to 3uttress threaded connections in sies 571/2; throu"h 20; diameter& b 4eference
>>?pin bearin" face !*amine for) 1&The presence of a %nife ed"e& 2& n# burrs on either the internal or e*ternal surface& >> ?chamfer !*amine for) 1&  feather ed"e 2& n# burrs .& +hamfer not present a full .600 around the circumference& 5&

Instruction # 11.0 Page  of 6 Effective Date 12/19/09


>>?-c thread len"th !*amine for) 1& n# imperfection or distortion of the thread form' hich ill produce a lon"itudinal or helical lea% path& 2 To blac% crested threads are alloed in the -c len"th pro(idin" neither e*tend more than 2A around the circumference of the connection& .& n# imperfection that penetrates throu"h the crests into the matin" flan%s of the threads& 5& n# imperfection that (isibl# bul"es the flan%s or results in a protrusion of metal from one or more threads& & n# other imperfection' hich mi"ht affect the sealin" capabilit# of the threads& 6& +orrosion pittin" on the . de"ree sealin" flan%s' roots of the pin threads or crest of the couplin" threads is reectable& >> ?non -c len"th !*amine for) 1& n# imperfection e*tendin" from the crest to the root of the threads& Or an# imperfection hose depth e*ceeds 127@A of nominal all thic%ness measured from the proected pipe surface& 2& n# metal protrusion that ma# pre(ent proper ma%eup or peal the protecti(e coatin" of the couplin" threads& >>? area !*amine for) 1& Threads not e*tendin" to the center of the couplin"& 2& These threads are non7en"a"ed threads and need not be perfect& >> ?internal couplin" threads !*amine for) 1& ll internal couplin" threads are considered to be -c threads and shall be inspected usin" the same criteria used for the e*ternal threads& >>?couplin" bearin" face !*amine for) 1& n# metal protrusions that ould pre(ent proper ma%eup& 2& n# feather ed"es& .& n# mashes or din"s& >> ?couplin" ma%eup !*amine for) 1& +ouplin" shall be made up to ithin one thread turn ?&200; from the base of the trian"le stamp for minimum poer ti"ht ma%eup& 2& +ouplin" shall not be made up further than the ape* of the trian"le for ma*imum poer ti"ht ma%eup& .& If the trian"le is not (isible on the couplin" end the ma%eup can be (erified b# measurin" the distance from the end of the couplin" to the end of the pipe inside the couplin"& The formula for determinin" nominal ma%eup position is) ?actual couplin" len"th di(ided b# 2 plus the  dimension& The tolerance on buttress couplin" ma%eup is) nominal distance plus &200; for ma*imum measured distance and nominal distance minus &.E; for minimum measured distance&




igure 11.  -uttress )*read 

.0 Records

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Feep an accurate count of pipe that as maintained as this ill be recorded and reported to the +ustomer&

:&2 The final report ill consist of t#pe of ser(ice' count of pipe and an# rele(ant concerns noticed of the pipe& :&. ll records shall be %ept for a minimum of  #ears& 2.0

Attac*ents

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The folloin" Tables are part of State !ner"#$s SOP number 10&0 of this manual and should be referenced durin" (isual inspection of threads& a b c

Table 1071' 4ound thread tolerances Table 1072' 3uttress thread tolerances Table 107.' Thread dimensions for 4ound and 3uttress

Visual Thread Inspection SOP

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