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| Specification
مشخصات |
A106 NPS 1/8 -- 48 ANSI Schedules to 160 |
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| Scope
دامنه |
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. |
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| Kinds of Steel Permitted
For Pipe Material
انواع
فولادهای مجاز جهت مواد اولیه |
Killec Steel Open-hearth
Basic-oxygen
Electric-furnace |
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| Hot-Dipped
Galvanizing
گالوانیزه گرم |
Not covered in specification. |
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| Permissible Variations
in Wall Thickness
تغییرات مجاز
در ضخامت |
The minimum wall thickness at any point shall not be more than 12.5% under the nominal wall thickness specified. |
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| Chemical Requirements
مشخصات شیمیایی
مورد نیاز
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Grade A |
Grade B |
Grade C |
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Carbon Max. %
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0.25 |
0.30 |
0.35 |
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Manganese %
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0.27 to 0.93 |
0.29 to 1.06 |
0.29 to 1.06 |
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Phosphorous Max %
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0.025 |
0.025 |
0.025 |
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Sulfur Max %
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0.025 |
0.025 |
0.025 |
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Silicon Min % |
0.10 |
0.10 |
0.10 |
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Tensile Requirements
نیروی کشش موردنیاز
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Seamless |
Grade A |
Grade B |
Grade C |
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| Tensile Strength, min., psi |
48,000 |
60,000
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70,000
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| Yield Strength, min., psi |
30,000 |
35,000 |
40,000 |
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| Hydrostatic Testing
تست هیدرواستاتیک
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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. |
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Permissible Variations
in Weights per Foot
تغییرات مجاز وزن در فوت
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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 |
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| Permissible Variations in Outside Diameter
تغییرات
مجاز در قطر خارجی
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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" |
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| Mechanical Tests Specified
تستهای مکانیکی تعریف شده
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Tensile Test --
NPS 8 and larger -- either transverse or longitudinal acceptable under.
Smaller than NPS 8 -- weighed in lots. Larger sizes --by length. Flattening Test -- NPS 2 and larger.
Bending Test (Cold) -- NPS 2 and under. Degree of Bend Diameter of Mandrel |
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Degree of Bend |
Diameter of Mandrel |
| For Normal A106 Uses |
90
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12 x nom. dia. of pipe
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| For Close Coiling |
180
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8 x nom. dia. of pipe
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| Number of Tests Required
تستهای موردنیاز
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NPS |
On One Length From Each Lot of |
| Tensile |
5 and smaller |
400 or less |
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6 and larger |
200 or less |
Bonding |
2 and smaller |
400 or less |
Flattening |
2 through 5 |
400 or less |
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6 and larger |
200 or less |
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| Lengths
طول ها
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Lengths required shall be specified on order. No "jointers" permitted unless otherwise specified. If no definite lengths required, following practice applies: |
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Single Random -- 16' - 22'. 5% may be 12' - 16' |
| Double Random -- Minimum length 22', Minimum average 35'. 5% may be 16' - 22'. |
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| Required Markings on Each Length (On Tags attached to each Bundle in case of Bundled Pipe)
مشخصات وزن بر روی هر شاخه لوله (در صورت بسته بندی بندیل مشخصات بر روی بندیل نیز درج گردد.)
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Rolled Stamped or Stenciled (Mfgrs. option) |
| Manufacturer's name or brand. |
Length of pipe. |
| A106 A, A106 B, A106 C. |
ANSI schedule number. |
| Hydrostatic test pressure and/or NDE. |
Weight per foot (NPS 4 and larger) |
| or NH if neither is specified. |
Additional "S" if tested supplementary requirements. |
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| General Information
اطلاعات کلی
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* Unless otherwise specified, pipe furnished with plain ends.
* Surface finish standards are outlined in specification.
* Purchaser may specify NDE in lieu of hydrostatic test or neither.
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