| 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. |