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| Specification
مشخصات |
API 5L NPS 1/8 -- 26
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| Scope
دامنه |
Covers WELDED and SEAMLESS pipe suitable for use in conveying gas, water, and oil in both the oil and natural gas industries. |
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| Kinds of Steel Permitted For Pipe Material
انواع فولادهای مجاز جهت مواد اولیه |
Open-hearth
Basic-oxygen
Electric-furnace |
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| Hot-Dipped Galvanizing
گالوانیزه گرم |
May be ordered galvanized. |
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| Permissible Variations in Wall Thickness
تغییرات مجاز در ضخامت |
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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 |
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| Chemical Requirements
مشخصات شیمیایی مورد نیاز |
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C max % |
Mn max % |
P max % |
S max % |
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Seamless or ERW
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Grade A
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0.25 |
0.95 |
0.05 |
0.06 |
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Grade B
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0.30 |
1.20 |
0.05 |
0.06 |
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Continuous-weld
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0.08 |
0.06 |
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Tensile Requirements
نیروی کشش موردنیاز
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Lists minimum yield and tensile strength for all grads 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. |
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Hydrostatic
Testing
تست هیدرواستاتیک |
Lists hydrostatic inspection test pressures for all sizes and grades covered by the specification.
Test Pressures are held for not less than:
Seamless:
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All sizes |
5 seconds |
| Welded: |
NPS 18 and smaller |
NPS 20 and larger |
5 seconds |
10 seconds |
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Permissible Variations
in Weights per Foot
تغییرات مجاز وزن در فوت
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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%.. |
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Permissible Variations
in Outside Diameter
تغییرات مجاز در قطر خارجی |
Outside Diameter
at any point shall not vary from standard specified more than:
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| Sizes |
Over |
Under |
NPS 1 1/2 and smaller |
1/64" |
1/32" |
NPS 2 through 4 |
1% |
1% (Buttweld Only) |
NPS 2 through 18 |
0.75% |
0.75% |
NPS 20 through 26 non-expanded |
1% |
1% |
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| Mechanical Tests Specified
تستهای مکانیکی تعریف شده |
Tensile Test --
Seamless and Buttwelded -- All Sizes -- Longitudinal Specimens
Electric Weld -- |
| NPS 6 and smaller |
NPS 8 and Larger |
| Longitudinal |
Transverse |
Bending Test (Cold) -- 2" and smaller Buttweld. |
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Degree of Bend
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Diameter of Mandrel
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| For Normal API Uses |
90
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12 x OD of pipe
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| Number of Tests Required
تستهای موردنیاز |
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NPS |
On One Length From Each Lot of
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| Tensile |
5 and smaller |
40 or less |
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6 through 12 |
200 or less |
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14 and larger |
100 or less |
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2 and smaller (Buttweld) |
25 tons or less |
| Bending |
1 1/2 and smaller (Buttweld) |
50 tons or less |
Flattening Tensile
Non-Expanded Electric-Weld for single lengths crop ends from each
length. For multiple lengths, crop ends from each length, plus 2
intermediate rings. |
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| Lengths
طول ها |
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| Threded and Coupled Pipe |
Single Random |
Double Random |
| Shortest Length in Entire Shipment |
16' 0" |
22' 0" |
| Shortest Lenght in 95% of Entire Shipment |
18' 0" |
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| Minimum Average Length of Entire Shipment |
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35' 0" |
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| Required Markings
on Each Length
(On Tags attached to
each Bundle in case
of Bundled Pipe)
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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 labulated (NPS 2 and larger only).
Heat treat symbols, as applicable -- HN, HS, HA or HQ. |
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| 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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