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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 folloed 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&
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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 Docuents
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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 folloin" 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
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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&&
State Energy Inspection Services Standard Operating Procedure Visual Thread Inspection
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Manual SOP Revision 1 Approval Signature
E&uipent
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Instruction # 11.0 Page 2 of 6 Effective Date 12/19/09
!quipment used in this procedure consists of the folloin"& 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
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4emo(e thread protectors and stac% for cleanin" prior to reappl#in" to the threads&
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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&
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ppl# a sequential number near the couplin" end of each len"th of pipe to be inspected&
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8hen rollin" pipe ithout thread protectors care should be ta%en to a(oid impact that ma# cause mechanical dama"e to the threads&
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-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 sies 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
State Energy Inspection Services Standard Operating Procedure Visual Thread Inspection
Instruction # 11.0 Page . of 6 Effective Date 12/19/09
Manual SOP Revision 1 Approval Signature
.& +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 proected 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 ?&20; 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 reectable condition& Doe(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&
State Energy Inspection Services Standard Operating Procedure Visual Thread Inspection
Instruction # 11.0 Page 5 of 6 Effective Date 12/19/09
Manual SOP Revision 1 Approval Signature
igure 11/1 Round )*read
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(riteria for -uttress )*read connections a These inspection requirements appl# to 3uttress threaded connections in sies 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&
State Energy Inspection Services Standard Operating Procedure Visual Thread Inspection
Instruction # 11.0 Page of 6 Effective Date 12/19/09
Manual SOP Revision 1 Approval Signature
>>?-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 To blac% crested threads are alloed in the -c len"th pro(idin" neither e*tend more than 2A 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 reectable& >> ?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 proected 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 poer ti"ht ma%eup& 2& +ouplin" shall not be made up further than the ape* of the trian"le for ma*imum poer 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&
State Energy Inspection Services Standard Operating Procedure Visual Thread Inspection
Instruction # 11.0 Page 6 of 6 Effective Date 12/19/09
Manual SOP Revision 1 Approval Signature
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 folloin" 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