|
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 |
- |
|
Phosporous,
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
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. |
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. |
