API-650 STORAGE TANK STD 650 NOV-1980 EDITION PLATE THICK
MAX. REINFORCEMENT THICK
VERTICAL
HORIZONT AL
<1/2"
3/32"
1/8"
>1/2" TO 1"
1/2 TO 1"
1/8"
3/16"
OVER 1"
>1"
3/16"
1/4"
NOT COVERED
ASME SEC-IX
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CIR. MAX:
MISALIGNMENT
The alignment of a butting ends shall minimize the offset between surfaces. For pipe ends of the same nominal thickness, the Inside diameter of the component Inside diameter of the component offset should not exceed Vertical misalignment <10% of at ends to be joined must be at ends to be joined must be 1/8"(3mm) larger variations are 1/16". Whichever larger aligned within engineering design aligned within engineering design permissible provided the variation (5.2.3.1). Horizontal and welding procedure. If the and welding procedure. If the is caused by variations of the misalignment <20% of upper external surfaces of the two external surfaces of the two pipe end dimensions with in the plate, with 1/8" maximum. components are not aligned the components are not aligned the pipe purchase specification (5.2.3.2). 1/16" misalignment is weld shall be tapered between weld shall be tapered between tolerances, and such variations allowed for plates less than the two surfaces. the two surfaces. have been distributed essentially 5/16" thick. (5.2.3.2). uniformly around circumference of the pipe. Hammering of the pipe to obtain proper line up should be kept minimum. (7.2)
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Compiled by: Mahesh Chandran. Zirku Island - UAE based on QGPC source document.
WELD DISCONTINUITY EVALUATION GUIDE
SERIAL NO
TYPE OF DISCONTINUITY
PRESSURE VESSELS ASME SEC VIII DIV 1 - 1986 EDITION 100% RADIOGRAPHY
Maximum length of 1/3T, Maximum length 2T, maximum Maximum length of 2/3T, where T maximum total length T in 12T of width of 1/8" or 1/2T. Maximum is thickness of material with 3/4" weld. Maximum width of 3/32" or total length 1/4T in 6" of weld maximum. Maximum total 1/3t 1/3T. T=wall length. lengths of T in 6T weld length. thickness. (Table T=wall thickness. (UW-52.C.2) Max. total 341.3.2A). (Table 341.3.2A) leng. 12t 1/4"
The length of an ESI indications exceeds 2". The aggregate Welds examined by radiography length of indications in any shall be judged according to continuous 12" length of weld ASME SEC VIII DIV 1. PARA exceeds 2". (9.3.8.1, 9.3.8.2 & UW-51(B), (6.1.5) 9.3.8.3). ESI - Elongated Slag Inclusions
Ref: (QW-191.2.1)
t=weld thickness RADIOGRAPHIC FILMS ONLY SHOW DEFECTS IN TWO DIMENSIONS , DEPTH OF DISCONTINUITI ES CANNOT BE DETECTED.
100% RADIOGRAPHY AND SPOT ARE QUALITY LEVEL DESIGNATIONS USED BY THE ASME PRESSUER VESSEL AND ANSI PIPING CODES, AND CAN BE USED TO EVALUATE OTHER METHODS OF NDT.
FOR >2-3/8" OD PIPE. FOR SMALLER DIAMETER SEE 6.512 NAD 6.522.
REFERENCES : CODES AND REGULATIONS:
1
ASME BOILER AND PRESSURE VESSEL CODE, SECTION VIII DIV 1.
2
ANSI B 31.3, CHEMICAL PLANT AND PETROLEUM REFINERY PIPING.
3
API 650 WELDED STEEL TANKS FOR OIL STORAGE TANKS.
4
API 1104, STANDARD FOR WELDING PIPE LINES AND RELATED FACILITIES.
5
ASME BOILER AND PRESSURE VESSEL CODE, SECTION 1 POWER BOILERS.
Compiled by: Mahesh Chandran. Zirku Island - UAE based on QGPC source document.
