A53 Pipe Specifications
NPS 1/4″ – 30″
Schedules 10 through 160, STD, XH and XXH
ASTM A53 pipe (also referred to as ASME SA53 pipe) is intended for mechanical and pressure applications and is also acceptable for ordinary uses in steam, water, gas and air lines. It is suitable for welding and for forming operations involving coiling, bending, and flanging, subject to certain qualifications.
American Piping Products stocks a full range of A53 pipe (SA53 Pipe) in:
- Grade B
- NPS ¼” to 30” diameter
- Schedules 10 through 160, STD, XH and XXH
ASTM A53 pipe 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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Materials and Manufacture
The steel for both seamless and welded pipe shall be made by one or more of the following processes: open-hearth, electric furnace, or basic-oxygen. The weld seam of electric-resistance welded pipe in Grade B shall be heat treated after welding.
|Type E||Type F|
|Grade A||Grade B||Grade A||Grade B||Grade A|
|Carbon max. %||0.25||0.30||0.25||0.30||0.3|
|Phosphorous, max. %||0.05||0.05||0.05||0.05||0.05|
|Sulfur, max. %||0.045||0.045||0.045||0.045||0.045|
|Nickel, max. %||0.40||0.40||0.40||0.40||0.4|
|Chromium, max. %||0.40||0.40||0.40||0.40||0.4|
|Molybdenum, max. %||0.15||0.15||0.15||0.15||0.15|
|Vanadium, max. %||0.08||0.08||0.08||0.08||0.08|
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.
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.
Permissible Variations in Weights per Foot
Plus or minus 10%
Permissible Variations in Outside Diameter
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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|Seamless and Electric-resistance-welded||Continuous-Welded|
|Grade A||Grade B|
|Tensile Strength, min., psi||48,000||60,000||45,000|
|Yield Strength, min., psi||30,000||35,000||25,000|
Number of Tests Required
Seamless and Electric-Resistance-Welded — Bending, flattening, tensile on one length of pipe from each lot of 500 lengths or less of a size. Continuous-Weld — Bending, flattening, tensile
|NPS 1 1/2 & smaller||NPS 2 & larger|
|one / 25 tons||one / 50 tons|
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.
Mechanical Tests Specified
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.
|Degree of Bend||Diameter of Mandrel|
|For Normal A53 Uses||90||12 x nom dia. of pipe|
|For Close Coiling||180||8 x nom dia. of pipe|
Flattening Test — NPS 2 and larger STD and XS. (Not required for XXS pipe.)
|Single Random — 16′ – 22′. 5% may be jointers. If Plain Ends — 5% may be 12′ – 16′.|
|Double Random — Shortest Length 22′, minimum average for order 35′.|
|Extra Strong and Double Extra Strong|
|Single Random — 12′ -22′. 5% may be 6′ – 12′.|
|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.|
Required Markings on Each Length
(On Tags attached to each Bundle in case of Bundled Pipe)
|Rolled, Stamped, or Stenciled (Mfrs. Option)|
|Name brand of manufacturer|
|Kind of pipe, that is, Continuous Welded, Electric-Resistance-Welded A, Electric-Resistance-Welded B, Seamless A, Seamless B, XS for extra strong, XXS for double extra strong.|
|Length of pipe|
|Couplings — Applied handling tight. Couplings, 2″ and smaller straight tapped, other sizes taper tapped.|
|Thread Protection — Applied to pipe 4″ and larger.|
|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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