Pipe: Grades & Specifications API 5L

Pipe Specification API 5L
Specification API 5L NPS 1/8 -- 26
Scope Covers WELDED and SEAMLESS pipe suitable for use in conveying gas, water, and oil in both the oil and natural gas industries.
Kinds of Steel
Permitted For
For Pipe Material
Open-hearth
Electric-furnace
Basic-oxygen
Hot-Dipped
Galvanizing
May be ordered galvanized.
Permissible Variations
in Wall Thickness
  Grade A, B, A25 X42 through X80
NPS 2 1/2 and smaller -- Seamless and welded, % +20 -- 12.5 +15 -- 12.5
NPS 3 -- Seamless and welded, % +18 -- 12.5 +15 -- 12.5
NPS 4 through 18 -- Seamless and welded, % +15 -- 12.5 +15 -- 12.5
NPS 20 and larger -- Welded, % +17.5 -- 10.0 +19.5 -- 8.0
NPS 20 and larger -- Seamless, % +15.0 -- 12.5 +17.5 -- 10.0
Chemical
Requirements
  Grade A Grade B Continuous Weld
Carbon max. % 0.25 0.30 -
Manganese % 0.95 1.20 -
Phosphorus, max. % 0.05 0.05 0.08
Sulfur, max. % 0.06 0.06 0.06
Tensile
Requirements
Lists minimum yield and tensile strength for all grades as well as a maximum tensile strength for X80. Maximum yield-to-tensile ratios outlined for cold-expanded pipe--may be waived when a fracture toughness requirement is specified.
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
Permissible Variations
in Weights per Foot
For each length of Standard Weight, Regular Weight, Extra Strong, and Double Extra Strong -- Not more than plus 10% minus 3.5%.
For Special Plain End -- Not more than plus 10% minus 5%.For Carload Lots -- Not more than minus 1.75%.
Permissible
Variations in
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 -- 4 1% 1% (Buttweld Only)
2 -- 18 .75% .75%
20 -- 26 Non-expanded 1%  1%
Mechanical Tests
Specified
Tensile Test - Seamless and Buttwelded -- All Sizes -- Longitudinal Specimens

Electric Weld:
NPS 6 and smaller -- Longitudinal
NPS 8 and Larger -- Transverse

Bending Test (Cold) -- 2" and smaller Buttweld:
For all API Uses: Degree of Bend = 90
Diameter of Mandrel = 12 x OD of pipe
Number of
Tests Required
  NPS On One Length From Each Lot of
Tensile 5 and smaller 40 or less
  6 through 12 200 or less
  14 and larger 100 or less
  2 and smaller (Buttweld) 25 tons or less
Bending 1 1/2 and smaller (Buttweld) 50 tons or less
Flattening Non-Expanded Electric-Weld for single lengths crop ends from each
length. For multiple lengths, crop ends from each length, plus 2
intermediate rings.

Lengths
Threaded &
Coupled Pipe
Shortest
Length
In Entire
Shipment
Shortest
Length in 95%
of Entire
Shipment
Minimum
Average
Length
of Entire
Shipment
Single Random 16' 0" 18' 0" --
Double Random 22' 0"  -- 35' 0"
Required Markings
on Each Length
(On Tags attached to
each Bundle in case
of Bundled Pipe)
• Paint Stenciled or Die Stamped (by agreement)
• 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 higher than tabulated (NPS 2 and larger only)
• Heat treat symbols, as applicable -- HN, HS, HA or HQ
General
Information
Supplementary Requirements available when specified.
SR3 -- Color Identification.
SR4 -- Nondestructive Inspection of Seamless Pipe.
SR5--Charpy impact Testing--Welded Pipe 20" & larger--Grade X52 or higher.
SR6 -- Drop Weight Tear Testing--Welded Pipe 20" & larger--Grade X52 or higher.
SR8 -- Fracture Tough ness Testing of Line Pipe.
  
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