|
Pipe Specification A106
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|
Specification |
A106
NPS 1/8 -- 48 ANSI Schedules to 160 |
|
Scope |
Covers SEAMLESS
carbon steel nominal wall pipe for
high-temperature service, suitable for bending,
flanging and similar forming operations.
NPS 1 1/2 and under may be either hot finished
or cold drawn. NPS 2 and larger shall be hot
finished unless otherwise specified. |
Kinds of Steel
Permitted For
For Pipe Material |
Killed Steel
Open-hearth
Electric-furnace
Basic-oxygen |
Hot-Dipped
Galvanizing |
Not covered in
specification. |
Permissible Variations
in Wall Thickness |
The minimum wall
thickness at any point shall not be more than
12.5% under the nominal wall thickness
specified. |
Chemical
Requirements |
| |
Grade A |
Grade B |
Grade C |
|
Carbon max.
% |
0.25 |
0.30 |
0.35 |
|
Manganese % |
0.27 to
0.93 |
0.29 to
1.06 |
0.29 to
1.06 |
|
Phosporous,
max. % |
0.025 |
0.025 |
0.025 |
|
Sulfur,
max. % |
0.025 |
0.025 |
0.025 |
|
Silicon,
min. % |
0.10 |
0.10 |
0.10 |
|
Tensile
Requirements |
|
Seamless |
| |
Grade A
|
Grade B |
Grade C |
|
Tensile Strength, min., psi |
48,000
|
60,000 |
70,000 |
|
Yield Strength, min., psi |
30,000 |
35,000 |
40,000 |
|
Hydrostatic
Testing |
Inspection test
pressures produce a stress in the pipe wall
equal to 60% or specified minimum yield strength
(SMYS) at room temperature.
Maximum Pressures
are not to exceed 2500 psi for NPS 3 and under
and 2800 psi
for the larger sizes. Pressure is maintained for
not less than 5 seconds. |
Permissible Variations
in Weights per Foot |
Weight of any
length shall not vary more than 10% over and
3.5% under that specified.
NOTE - NPS 4 and smaller - weighed in lots.
Larger sizes - by length |
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
|
1/32"
|
1/32" |
|
5 -- 8
|
1/16"
|
1/32" |
|
10 -- 18
|
3/32"
|
1/32" |
|
20 -- 26
|
1/8"
|
1/32" |
|
Mechanical Tests
Specified |
Tensile Test - NPS
8 and larger - either transverse or
longitudinal acceptable
Smaller than NPS 8 -- weighed in lots. Larger
sizes -- by length.
Flattening Test - NPS 2 and larger.
Bending Test(Cold) - NPS 2 and under.
For normal A106 uses:
Degree of Bend = 90
Diameter of Mandrel = 12 x nom. dia. of pipe
For close coiling:
Degree of Bend = 180
Diameter of Mandrel = 8 x nom. diameter of pipe |
Number of
Tests Required |
| |
NPS
|
On One Length From
Each Lot of |
|
Tensile
|
5 and
smaller |
400 or less |
| |
6 and larger
|
200 or less |
|
Bonding
|
2 and
smaller |
400 or less |
|
Flattening
|
2 through 5
|
400 or less |
| |
6 and over
|
200 or less |
|
|
Lengths |
Lengths required
shall be specified on order. No "jointers"
permitted unless otherwise specified.
If no definite lengths required, following
practice applies:
Single Random -- 16' - 22'. 5% may be 12' - 16'
Double Random -- Minimum length 22', Minimum
average 35'. 5% may be 16' - 22'. |
Required Markings
on Each Length
(On Tags attached to
each Bundle in case
of Bundled Pipe) |
Rolled Stamped or
Stenciled (Mfrs. option)
•
Manufacturer's name or brand.
• Length of pipe.
•
A106 A, A106 B, A106 C. ANSI schedule number.
•
Hydrostatic test pressure and/or NDE or NH if
neither is specified
• Weight per
foot (NPS 4 and larger)
• Additional "S" if
tested supplementary requirements. |
General
Information |
* Unless otherwise
specified, pipe furnished with plain ends.
*
Purchaser may specify NDE in lieu of hydrostatic
test or neither.
* Surface finish standards are outlined in
specification. |
