Specification

A106 NPS 1/8 -- 48 ANSI Schedules to 160

Scope

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.

Kinds of Steel Permitted For For Pipe Material

Killed Steel Open-hearth Electric-furnace Basic-oxygen

Hot-Dipped

Galvanizing

Not covered in specification.

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.

Chemical

Requirements

Grade A Grade B Grade C

Carbon max. %......................................... 0.25 0.30 0.35

Manganese %.......................................0.27 to 0.93 0.29 to 1.06 0.29 to 1.06

Phosporous, max. %.................................. 0.025 0.025 0.025

Sulfur, max. %.......................................... 0.025 0.025 0.025

Silicon, min. %.......................................... 0.10 0.10 0.10

Tensile

Requirements

Seamless

Grade A Grade B Grade C

Tensile Strength, min., psi.......................... 48,000 60,000 70,000

Yield Strength, min., psi............................ 30,000 35,000 40,000

Hydrostatic

Testing

Inspection test pressures produce a stress in the pipe wall equal to 60% or specified minimum yield strength (SMYS) at room temperature. Maximum Pressures are not to exceed 2500 psi for NPS 3 and under and 2800 psi for the larger sizes. Pressure is maintained for not less than 5 seconds.

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 -- by length

Permissible Variations in Outside Diameter

Outside Diameter at any point shall not vary from standard specified more than--NPS Over Under

1 1/2 and smaller 1/64" 1/32"

2--4 1/32" 1/32"

5--8 1/16" 1/32"

10-- 18 3/32" 1/32"

20--26 1/8" 1/32"

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 and larger.

Bending Test(Cold) -- NPS 2 and under. Degree of Bend Diameter of Mandrel

For Normal A106 uses 90 12 x nom. dia. of pipe For Close Coiling 180 8 x nom. dia. of pipe

Number of Tests Required

NPS On One Length From Each Lot of Tensile 5 and smaller 400 or less 6 and larger 200 or less Bonding 2 and smaller 400 or less Flattening 2 through 5 400 or less 6 and over 200 or less

Lengths

Lengths required shall be specified on order. No "jointers" permitted unless otherwise specified. If no definite lengths required, following practice applies:

Single Random -- 16' - 22'. 5% may be 12' - 16'

Double Random -- Minimum length 22', Minimum average 35'. 5% may be 16' - 22'.

Required Markings on Each Length (On Tags attached to each Bundie in case of Bundled Pipe)

Rolled Stamped or Stenciled (Mfgrs. option)

Manufacturer's name or brand. Length of pipe.

A106 A, A106 B, A106 C. ANSI schedule number.

Hydrostatic test pressure and/or NDE. Weight per foot (NPS 4 and larger)

or NH if neither is specified. Additional "S" if tested supplementary requirements.

General

Information

*    Unless otherwise specified, pipe furnished with plain ends. * Purchaser may specify NDE

*    Surface finish standards are outlined in specification. in lieu of hydrostatic test or neither