APPENDIX T—NDE REQUIREMENTS SUMMARY
Process
Reference Section
Welds Requiring Inspection
Air Tes estt
Reinfo Rei nforc rceme ement nt pla plate te we welds lds ins insid idee and and out outsid sidee to to 100 100 kP kPaa (15 (15 lbf lbf/in /in..2).
7.3.4
Air Test
Roofs designed to be airtight if roof seams are not vacuum-box tested.
7.3.7.1a
Air Test
Appendix F roofs during hydro-test of tanks.
F.4.4
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Air Test
Aluminum dome roofs if required to be gas-tight.
G.10.1.2
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Air Test
Shop built tanks if not tested per 7.3.2 – 7.3.7.
J.4.2.2
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Air Test
Shop fabricated compartments (pontoons). Test in shop and field.
H.6.4
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Hydro
Tank shell.
7.3.6
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MT
Flus Fl ushh-ty type pe sh shel elll con conne nect ctio ions ns:: Noz Nozzl zlee-to to-t -tan ank k she shell ll,, Rep Repad ad we weld lds, s, sh shel elll-to to-b -bot otto tom m rei reinf nfor orci cing ng pad welds on the root pass, each 12.5 mm (1/2 in.) of weld, and completed weld. After stress relieving before hydro-test.
5.7.8.11
MT
Perman Perm anen entt att attac achm hmen entt wel welds ds an and d tem tempo pora rary ry we weld ld re remo mova vall are areas as on Gr Grou oup p IV IV, IV IVA, V, and and VI materials.
7.2.3.5
MT
Completed welds of stress relieved assemblies before hydro-test.
7.2.3.6
MT
Firstt pas Firs passs of of the the in inte tern rnal al sh shel elll-to to-b -bot otto tom m wel weld d unl unles esss ins inspe pect cted ed by pe pene netr trat atin ing g oil oil or PT or or VB. VB. 7.2.4.1a Not required if the final weld is tested by pressure (see 7.3.4.2) 7.3.4.2) or if agreed to by Purchaser and the final weld is tested by MT, PT or VB.
MT
Fina Fi nall she shell ll-t -too-bo bott ttom om we weld lds, s, in insi side de an and d out outsi side de in inst stea ead d of of MT MT, PT PT, pen pen.. oil oil,, or or VB VB of of the the in init itia iall inside pass. (1/2
7.2.4.3c 07
MT
Shell ll-t -too-bo bottto tom m fil ille lett weld ldss in incclu lud din ing g the roo oott pass, 20 mm in.), and final surface of Appendix M tanks for which the stress concentration factor of K = 2.0 is used.
M.4.2
MT
NonNo n-st stru ruct ctur ural al sm smal alll att attac achm hmen ents ts su such ch as in insu sula lati tion on cl clip ipss (no (nott sup suppo port rts) s) st stud udss and and pi pins ns no nott welded by capacitor discharge. Unless tested by liquid penetrant.
7.2.1.11
Pen. Oil
All seams of internal floating roofs exposed to liquid or vapors unless VB tested.
H.6.2
Pen. Oil
First pass of the internal shell-to-bottom weld if approved instead of MT or PT.
7.2.4.1d
Pen. Oil
Tank shell if no water for hydrostatic test.
7.3.5
Pen. Oil
Deck seams of external floating roofs.
C.4.2
Pen. Oi Oil
Welded shell jo joints ab above th the hy hydrostatic te test wa water le level un unless va vacuum-box te tested.
7.3.6.1
Pen Pe n. Oi Oill
Com Co mpa parrtm tmeent we weld ldss of exte terrnal fl flo oati tin ng ro roo ofs not te tesste ted d wit ith h int nteern rnaal pre resssure or VB.
C.3 .3.6 .6
PT
Perman Perm anen entt att attac achm hmen entt wel welds ds an and d tem tempo pora rary ry we weld ld re remo mova vall are areas as on Gr Grou oup p IV IV, IV IVA, V, VI VI materials instead of MT if approved.
7.2.3.5
PT
Welds attaching nozzles, manways, and clean out openings instead of MT if approved.
7.2.3.6
PT
First pass of the internal shell-to-bottom weld if approved instead of MT.
7.2.4.1b or c
PT
Finall she Fina shell ll-t -too-bo bott ttom om we weld lds, s, in insi side de an and d out outsi side de in inst stea ead d of of MT MT, PT PT, pen pen.. oil oil,, or or VB VB of of the the in init itia iall inside pass.
7.2.4.3c
PT
All aluminum structural welds and components joined by welding.
G.11.3
PT
Stainl Stai nles esss st stee eell tan tank k sh shel elll-to to-b -bot otto tom m we weld lds, s, op open enin ing g co conn nnec ecti tion onss no nott ra radi diog ogra raph phed ed al alll we weld ldss of S.4.14.2 attachments to shells, and all butt welds of annular plates on which backing strips are to remain.
PT
Non-st Nonstru ruct ctur ural al sm smal alll att attac achm hmen ents ts su such ch as in insu sula lati tion on cl clip ipss (not (not su supp ppor orts ts)) stud studss and and pi pins ns no nott welded by capacitor discharge. Unless tested by magnetic particle. T-1
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7.2.1.11
T-2
API STANDARD 650
RT
Shell plate butt welds unless examined by UT with Purchaser approval. RT is not required for Appendix A, J, and S tanks where the Joint Efficiency of 0.7 is used.
7.3.2.1, A.5.3, S.4.14.1
RT
Butt welds of annular plates that are required by 7.5.1 or M.4.1.
8.1.2.9
RT
Flush-type shell connections: 100% of all longitudinal butt welds in the nozzle neck and transition piece, if any, and the first circumferential butt weld in the neck closest to the shell, excluding the neck-to-flange weld.
5.7.8.11
RT
Shell vertical and horizontal welds which have intersecting openings and repads—100% over weld length 3 times the diameter of the opening.
5.7.3.4
Tracer Gas
Entire length of bottom weld joints as an alternative to vacuum-box testing.
7.3.3.b
UT
Shell plate butt welds if approved by Purchaser.
7.3.2.1
First pass of the internal shell-to-bottom weld if approved instead of MT, PT, or Pen. Oil.
7.2.4.1e
Bottom welds.
7.3.4a
Welds of roofs designed to be gas-tight if not air tested.
7.3.7.1
All seams of internal floating roofs exposed to liquid or vapors if not tested by penetrating oil.
H.6.2
Seams of flexible membrane liners for leak protection.
I.6.2
Welded shell joints above the hydrostatic test water level unless tested with penetrating oil.
7.3.6.1
Shell-to-bottom weld joints.
7.2.4.3c
VE
Flush type shell connections: Nozzle-to-tank shell, repad welds, shell-to-bottom reinforcing pad welds on the root pass, each 20 mm ( 1/2 in.) of weld, and completed weld. After stress relieving before hydro-test.
5.7.8.11
VE
Tack of shell butt welds left in place.
7.2.1.8
VE
Permanent attachment welds and temporary weld removal areas on Group IV, IVA, V, and VI materials.
7.2.3.5
VE
Completed welds of stress relieved assemblies before hydro-test.
7.2.3.6
VE
First pass and final weld inside and outside of the internal shell-to-bottom weld.
7.2.4.1, 7.2.4.2, 7.2.4.3
VE
All shell plate butt welds.
7.3.2.1
VE
All fillet welds including roof plate welds.
7.3.2.2
VE
Upper side of the upper deck welds of pontoon and double deck floating roofs.
C.4.4
VE
All aluminum structural welds and components joined by welding.
G.11.3
VE
Joint fit-up of butt welds of bottoms supported by grillage and each weld pass.
I.7.4
VE
Non-structural small attachments such as insulation clips (not supports) studs and pins including those welded by capacitor discharge.
7.2.1.11
VE
Leak barrier, leak barrier penetrations, attachments to ringwalls and other appurtenances.
I.6.1
VE
Bottom welds.
7.3.3
VE
Roof welds not designed to be gas-tight.
7.3.7.2
Water
Bottom welds if not vacuum-box or tracer gas tested.
7.3.3c
Water
External floating roofs—flotation test.
C.4.3
Water
External floating roof drain pipe and hose systems with pressure.
C.4.5
Water
Aluminum dome roofs after completion.
G.10.1.1
Water
Internal floating roofs flotation test.
H.7.3
VB VB
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WELDED STEEL T ANKS
FOR
OIL STORAGE
T-3
Definitions: MT = Magnetic Particle Examination Pen Oil = Penetrati ng Oil Test PT = Liquid Penetrant Examination RT = Radiographic Testing VB = Vacuum-Box Testing VE = Visual Examination Acceptance Standards: MT: ASME Section VIII, Appendix 6 (Paragraphs 6-3, 6-4, 6-5) PT: ASME Section VI II, Appendix 8, (Paragraphs 8-3, 8-4, 8-5) RT: ASME Section VIII, Paragraph UW-51(b) Tracer Gas: API Std 650, Section 8.6.11 UT: For welds examined by UT in lieu of RT, acceptance standards are in Appendix U. For UT when RT is used for the requirements of 7.3.2.1, the acceptance standard is as agreed upon by the Manufacturer and Purchaser.
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VB: API Std 650, Section 8.6
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VE: API Std 650, Section 8.5
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Examiner Qualifications:
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MT: API Std 650, Section 8.2.3.
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PT: API Std 650, Section 8.2.3 RT: ASNT SNT-TC-1A Level II or II I. Level-I personnel may be used under the supervision of a Level II or Level III with a written procedure in accordance with ASME Section V, Article 2. Tracer Gas: None UT: For welds examined by UT in lieu of RT, the inspector must be ASNT-TC-1A or CP-189 Level II or Level III. For UT when RT is used for the requirements of 7.3.2.1, the required qualifications are ASNT-TC1A Level II or Level III. A Level I may be used with restrictions—see API Std 650, Section 8.3.2. VB: None VE: None Procedure Requirements: MT: ASME Section V, Article 7 PT: ASME Section V, Article 6 RT: A procedure is not required. However, the examination method must comply with ASME Section V, Article 2. Acceptance standards shall be in accordance with ASME Section VIII, Paragraph UW-51(b). UT: For shell welds examined by UT in lieu or RT, ASME, Section V, Article 4 and U.3.5. For welds when RT is used for the requirements of 7.3.2.1, ASME Section V. VB: None VE: None Tracer Gas: API Std 650, Section 8.6.11.a.
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