Specification A53 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.
Mechanical Properties – Tensile Requirements
|Seamless and ERW||Grade A||Grade B|
|Tensile Strengh, min., psi||48,000||60,000|
|Yield Strength, min., psi||30,000||35,000|
|Seamless and ERW||C max %||Mn Max %||P max %||S max %|
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.
Tensile Test – Transverse required on ERW for NPS 8 & lager
Flattening Test – For NPS 2 and larger, STD and XS walls. (Not required for XXS pipe)
Bending Test (cold) – For NPS 2 and under, XS wall and under / For NPS 1 1/4 and under, under XXS wall.
|Degree of Bend||Diameter of Mandrel|
|For Normal A53 Uses||90||12 X dia. of Pipe|
|For Close Coiling||180||8 X dia. of Pipe|
Number of Tests
Seamless and Electric Resistance Weld – Bending, flattening, tensile on one length of pipe from each lot of 500 lengths, of each pipe size.
The minimum wall thickness at any point shall not be more than 12.5% under the nominal thickness specified.
Weights per Foot
Plus or Minus 10%
Outside Diameter at any point shall not vary from standard specified more than:
|1 1/2 and smaller||+1/64||-1/64|
|For Close Coiling||+1%||-1%|