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PERMISSIBLE VARIATIONS IN DIMENSIONS AND SHAPES
General pipes:permissible variations in outside diameter and thickness
Type Permissible variation % Remarks
Outside diameter ±0.5 margin of error is applied to the circumference
Thickness Normal diameter 450A or lower +15
-12.5
Normal diameter higher than 450A +15
-10
Pipeline
Type KSF 4602 ASTM A252
Permissible variations Measurement method Permissible variations
Outside diameter Head shape ±0.5% Outside circumference ±1%
Body ±1.0%
Thickness Thickness lees than 16mm Outside diameter less than 500mm +unspecified
-0.6mm
  +unspecified
-12.5%
Outside diameter more than 500㎜ and less than800㎜ +unspecified
-0.7mm
Outside diameter more than 800㎜ +unspecified
-0.8mm
Thickness more than 16mm Outside diameter less than 800 mm +unspecified
-0.8mm
Outside diameter more than 800㎜ +unspecified
-1.0mm
Length +unspecified
-0
  ±1 in
Bending 0.1% of the bend length% Straight for practical purposes
Cross section of the welded splice 2㎜ or less unspecified
Cross section of the welded splice cut at a right angle 0.5% of the outside diameteror shorter, but a maximum of 4 unspecified
Weight unspecified   +15%
-5%
Surface condition -   the depth of the groove: 25% or less of the thickness
DIMENSION AND WEIGHT OF GENERAL PIPES
Korean industrial standards ㉿ dimension specifications
Type Diameter Outside diameter (mm) Thickness (mm)
A B 6.0 6.4 7.1 7.9 8.7 9.5 10.3 11.1 11.9 12.7 13.1 14.0 15.1 16.0 18.0 19.0 21.0
400 16 406.4 59.2 63.1 69.9 77.6                          
450 18 457.2 66.8 71.1 78.8 87.5                          
500 20 508.0 74.3 79.2 87.7 97.4 107 117                      
550 22 558.8 81.8 87.2 96.6 107 118 129 139 150 160 171              
600 24 609.6 89.3 95.2 105 117 129 141 152 164 175 187              
650 26 660.4 96.8 103 114 127 140 152 165 178 190 203              
700 28 711.2 104 111 123 137 151 164 178 192 205 219              
750 30 762.0   119 132 147 162 176 191 206 220 235              
800 32 812.8   127 141 157 173 188 204 219 235 251 258 276 297 314      
850 34 863.6   135 150 167 183 200 217 233 250 266 275 293 316 334      
900 36 914.4   143   177 194 212 230 247 265 282 291 311 335 354      
1000 40 1016.0       196 216 236 255 275 295 314 324 346 373 395      
1100 44 1117.6           260 281 303 324 346 357 381 411 435      
1200 48 1219.2           283 307 331 354 378 390 466 448 475      
1350 54 1371.0                 399 426 439 469 505 535      
1500 60 1524.6                 444 473 488 521 562 595      
1600 64 1625.4                     521 556 600 635      
1650 66 1676.4                     537 574 619 655      
1800 72 1828.8                     587 627 675 715      
2000 80 2032.0                         751 795      
2200 88 2235.2                         821 876 984 1038  
2400 96 2438.4                         902 956 1074 1134 1252
2600 104 2641.6                         1036 1100 1165 1229 1293
  1. The normal diameter of the pipe shall use A or B. If there is a need for the diameter to be represented by A or B, each figure shall be followed by A or B, respectively.
  2. The calculation of weight shall be done according to the following formula, setting 1㎤ steel at 7.85g. Based on KS A 0021 the digits of the figure shall be cut at the third digit of the significant number.
    W=0.02466t(D-t)
    W : pipe weight(㎏/m)
    t : thickness of the pipe(㎜)
    D : outside diameter of the pipe(㎜)
  3. Other figures shall abide by the agreement made by the ordering client and the manufacturer.
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