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ASTM/ ASME A106/SA106 High Temperature Seamless Carbon Steel Pipe

A106 Comparative Specifications

ASTM Specification A106 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. Surface finish standards are outlined in the specification.ASTM A106 pipe (also covered in ASME specifications as S/A 106) is the standard specification for seamless carbon steel pipe for high-temperature service. Most common uses are in refineries and plants when gasses or fluids are transported at high temperatures and pressures.

supply of A106 / SA 106 pipe and stocks a full range of grades B/C in a size rage of NPS 1/8″ to NPS 48″, with nominal (average) wall thickness as given in ANSI B36.10. Pipe having other dimensions may be furnished provided such pipe complies with all other requirements of this specification*. Pipe ordered under this specification shall be suitable for bending, for flanging, for welding, and for similar forming operations. A full range of A106 stock is available in Schedules 10 through 160, STD, XS, XXS. Unscheduled wall thicknesses available up to 4 inches.
Testing Requirements for seamless A106 carbon steel pipe

Hydrostatic Testing: Inspection test pressures produce a stress in the pipe wall equal to 60% of specified minimum yield strength (SMYS) at room temperature. Maximum pressures are not to exceed 2,500 psi for NPS 3 and under, and 2,800 psi for the larger sizes. Pressure is maintained for no less than 5 seconds.

Mechanical Tests:

	Degree of Bend	Diameter of Mandrel
For normal A106 uses	90	12x nominal diameter of pipe
For close coiling	180	8x nominal diameter of pipe

Tensile Test: Either transverse or longitudinal are acceptable for NPS 8 and larger
Tensile tests smaller than NPS 8: Longitudinal testing only
Flattening Test: NPS 2 and larger
Bending Test (cold): NPS 2 and under

Grades B/C

Sizes

NPS 1/8″ to NPS 48”
Wall thickness: Schedules 10 through 160, STD, XS, XXS.

Lengths of A106 seamless carbon steel pipe

Lengths of A106 seamless carbon steel pipe must be specified on order. No “jointers” are permitted unless otherwise specified. If no definite lengths are required, the following practice applies:

Single random – 16’ – 22’ (5% may be 12’ – 16’)

Double random – Minimum length is 22’. Minimum average is 35’ (5% may be between 16’ – 22’)

Marking Requirements

Rolled, die stamped, or paint stenciled (manufacturer’s option).

Manufacturer’s name, brand, or trademark

A106 A, A106 B, or A106 C

Hydrostatic test pressure and/or NDE, or NH if neither is specified

Size, length, weight per foot (NPS 4 and larger)

ANSI schedule number or weight class or wall thickness

Additional “S” if tested supplementary requirements

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