A/SA106 Pipe Specifications
ASTM A106 and ASME SA106 seamless pressure pipe is commonly used in the construction of oil and gas refineries, power plants, petrochemical plants, boilers, and ships where the piping must transport fluids and gases that exhibit higher temperatures and pressure levels.
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UKR Steel Products stocks a full range of A/SA106 pipe in:
ASTM A106 and ASME SA106 cover seamless carbon steel nominal wall pipe for high-temperature service. Suitable for bending, flagging, 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.
Process
Killed steel, with the primary melting process being open-hearth, basic-oxygen, or electric-furnace, possibly combined with separate degassing or refining.
Steel cast in ingots or strand cast is permissible.
Hot-finished pipe need not be heat treated.
Cold-drawn pipe shall be heat treated after the final cold draw pass.
Chemical Requirements
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
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 shall be weighed separately by length.
Permissible Variations in Outside Diameter
It is industry standard for steel pipe mills to produce A106 pipe to the same OD tolerance of A53 pipe, with a +/- 1% OD tolerance.
Tensile Requirements
Hydrostatic Testing
Inspection test pressures produce a stress in the pipe wall equal to 60% of the specified minimum yield strength (SMYS) at room temperature. Maximum Pressures are not to exceed 2500 psi for NPS3 and must stay under 2800 psi for the larger sizes. Pressure is maintained for not less than 5 seconds.
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 2-1/2 and larger. Bending Test (Cold) — NPS 2 and under.
Lengths
Lengths required shall be specified on order. No “jointers” permitted unless otherwise specified. If no definite lengths required, following practice applies: Single Random — 17′ ~ 24′ lengths Double Random — 36′ ~ 44′ lengths
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, A 106 B, A 106 C. ANSI schedule number. Hydrostatic test pressures and/or NDE; Weight per foot (NPS 4 and larger) or NH if neither is specified. Additional “S” if tested supplementary requirements.
Referenced Documents
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ASTM A 530/A 530M Specification for General Requirements for Specialized Carbon and Alloy Steel Pipe
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ASTM E 213 Practice for Ultrasonic Examination of Metal Pipe and Tubing
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ASTM E 309 Practice for Eddy-Current Examination of Steel Tubular Products Using Magnetic Saturation
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ASTM E 381 Method of Macroetch Testing Steel Bars, Billets, Blooms, and Forgings
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ASTM E 570 Practice for Flux Leakage Examination of Ferromagnetic Steel Tubular Products
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ASME B36.10M Welded and Seamless Wrought Steel Pipe