Chemical Requirements

Back Print Page

Seamless Line Pipe:

Electric Resistance Weld Line Pipe:

aFor each reduction of 0.01% below the specified maximum carbon content, an increase of 0.05% above the specified maximum manganese content is permissible, up to a maximum of 1.50% for Grades X42 through X52, up to a maximum of 1.65% for Grades higher than X52 but less than X70, and up to 2.00% for Grades X70 and higher.
bColumbium [niobium], vanadium, titanium, or combinations therof may be used by agreement between purchaser and manufacturer.
cColumbium [niobium], vanadium, titanium, or combinations therof may be used at the discretion of the manufacturer.
dThe sum of the columbium [nobium], vanadium, and titanium contents shall not exceed 0.15%.
eOther chemical compositions may be furnished by agreement between purchaser and manufacturer, providing that the limits of Footnote d and the tabular limits for phosphorus and sulfer are met.

Testing Requirements

• Hydrostatic Testing

  Lists hydrostatic inspection test pressures for all sizes and grades covered by the specification. Test Pressures are held for not less than:
  

  • Seamless	(all sizes) - 5 seconds
  • Welded	(NPS 18 and smaller) - 5 seconds
  	(NPS 20 and larger) - 10 seconds

• Mechanical Tests

  Tensile Test
  Seamless and ERW	NPS 6 and smaller - Longitudinal NPS 8 and larger - Transverse
  Charpy Tests	PSL 2
  Flattening Test	ERW - All sizes

• Number of Tests

  Flattening: Non-Expanded ERW for single lengths, crop ends from each lenth. For multiple lengthes, crop ends from first and last pipe of each coil, plus 2 intermediate rings.
  Tensile:

  NPS	On One Length From Each Lot of:
  5 and smaller	400 or less
  6 through 12	200 or less
  14 and larger	100 or less

Permissible Variations

• Wall Thickness

  NPS	Grade A, B, A25	X42 through X80
  2 1/2 and smaller - Seamless and Welded	+20%    -12.5%	+15%   -12.5%
  3 through 18 - Seamless and Welded	+15%    -12.5%	+15%    -12.5%
  20 and larger - Welded	+17.5%   -12.5%	+19.5%  -8.0%
  20 and larger - Seamless	+15.0%   -12.5%	+17.5%   -10.0%

• Weights per Foot

  For Single Lengths Spcial Plain End and Grade A25: Not more than plus 10% minus 5%.
  For Single Lengths Other Pipe: Not more than plus 10% minus 3.5%
  For Carload Lots: Not more than minus 1.75%
  Note: NPS 4 OD and smaller may be weighed individually or in convenient lots. Larger sizes by length.

• Outside Diameter

  Outside Diameter at any point shall not
  vary from standard specified more than:

  NPS	Over	Under
  1 1/2 and smaller	+1/64	-1/32
  2 through 18	+.75%	-.75%
  20 and larger Seamless	+1%	-1%
  20-36 Welded	+.75%	-.25%

  Outside Diameter End Tolerances
  (plain end pipe, distance from each end):

  NPS	Over	Under
  10 and smaller	+1/16	-1/64
  12 and larger	+3/32	-1/32

  Out-of-Roundness Tolerances
  (distance of 4" from each end):

  NPS	Over	Under
  22 and larger	+1%*	-1%*

  *Based upon nominal OD specified.

Lengths

Marking Requirements on Each Length

• Painted Stenciled or Die Stamped

  Manufacturer's name or mark, Spec 5L, size, weight per foot, grade, process of manufacture, type of steel, length (NPS 4 and larger only). Test pressure when hogher than tabulated (NPS 2 and larger only). Heat treat symbols, as applicable - HN, HS, HA or HQ.