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| Specification
مشخصات |
A53 NPS 1/8 - 26 STD. XS and XXS, ANSI Schedules
10 through 160 |
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| Scope
دامنه |
Covers
Seamless and Welded, Black and hot-dipped galvanized nominal (average)
wall pipe for coiling, bending,
flanging
and other special purposes and is suitable for welding. Continuous-Welded
pipe is not intended for flanging. Purpose for which pipe is intended
should be stated on order. |
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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 |
Sets standards for coating of pipe with zinc inside
and outside by the hot-dipped process. Weight of coating must
not average
less than 1.8 oz. Per square foot and not less than 1.6 oz. Per
square foot. |
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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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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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- |
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0.08 |
0.06 |
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Tensile Requirements
نیروی کشش موردنیاز
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Continuous Welded
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Seamless and Electric- Resistance Welded
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Grade A
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Grade B
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Tensile Strength, min., psi |
45,000
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48,000
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60,000
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Yield Strength, min., psi |
25,000
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30,000
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35,000
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| Hydrostatic Testing
تست
هیدرواستاتیک |
Hydrostatic inspection test pressures for plain end and threaded and coupled pipe are specified. Hydrostatic
pressure shall be maintained for not less than 5 seconds for all sizes of seamless and electric resistance-weld pipe.
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| Permissible Variations in Weights per Foot
تغییرات مجاز
وزن در فوت |
Plus or Minus 10% |
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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 -- |
| For NPS 1 1/2 and Smaller Sizes |
For NPS 2 and Larger Sizes |
| 1/64 " --- 1/32" under |
1% over --- 1% under |
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| Mechanical Tests Specified
تستهای مکانیکی تعریف شده |
Tensile Test -- Transverse required on ERW for NPS 8 and large.
Sending Test (Cold) -- STD and XS-NPS 2 and under XXS-NPS 1 1/4 and under.
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Degree of Bend
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Diameter of Mandrel
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| For Normal A53 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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| Flattening Test -- NPS 2 and larger STD and XS. (Not required for XXS pipe).
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| Number of Tests Required
تستهای موردنیاز |
Seamless and Electric-Resistance-Welded -- Bending, flattening, tensile on one length of pipe from each lot of 500 lengths or less of a size.
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Continuous-Weld -- Bending, flattening, tensile
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NPS 1 1/2 & smaller
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NPS 2 & larger
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one/25 tons
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one/50 tons
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| Lengths
طول ها |
Standard Weight. |
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Single Random -- 16' - 22'. 5% may be jointers. If Plain Ends -- 5 % may be 12' - 16' |
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Double Random -- Shortest Length 22', minimum average for order 35'. |
| Extra Strong & Double Extra Strong |
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Single Random -- 12' - 22'. 5% may be 6' - 12'. |
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Double Random (XS and lighter) -- Shortest Length 22', minimum average for order 35'. |
| Lengths longer than single random with wall thicknesses heavier than XS subject to negotiation.
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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.) |
Rolled, Stamped or Stenciled (Mfgrs. Option)
Name or brand of manufacturer.
Kind of pipe, that is, Continuous Welded, Electric-Resistance-Welded A, Electric-Resistance-Welded B, Seamless A;
or Seamless B; XS for extra strong, XXS for double extra strong.
ASTM A53
Length of pipe. |
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| General Information
اطلاعات کلی |
Couplings -- Applied handling tight. Couplings, 2" and smaller straight tapped, other sizes taper tapped. Thread Protection -- Applied to pipe 4" and large.
End Finish (unless otherwise specified)--
STD or XS, or wall thicknesses less than 0.500 in. (excluding XXS): Plain and beveled.
All XXS and wall thicknesses over 0.500 in.: Plain end square cut.
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