| Scope |
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. |
| Kinds of Steel Permitted For Pipe Material |
Open-hearth
Basic-oxygen
Electric-furnace |
| Hot-Dipped Galvanizing |
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. |
| Chemical Requirements |
| |
C max % |
Mn max % |
P max % |
S max % |
| Seamless or ERW Grade A |
0.25 |
0.95 |
0.05 |
0.06 |
| Seamless or ERW Grade B |
0.30 |
1.20 |
0.05 |
0.06 |
| Continuous-weld |
- |
- |
0.08 |
0.06 | |
| Tensile Requirements |
| |
Seamless and Electric Resistance Welded |
| |
Continuous-Welded |
Grade A |
Grade B |
| Tensile Strength, min., psi |
45,000 |
48,000 |
60,000 |
| Yield Strength, min., psi |
25,000
|
30,000 |
35,000 | |
| Hydrostatic Testing |
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. |
| 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
1/64 " 1/32" under |
For NPS 2 and Larger Sizes
1% over 1% under | |
| 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). |
| 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: one/25 tons
-- NPS 2 & larger: one/50 tons |
| Lengths |
Standard Weight
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 & 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 thicknessess 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 (Mfgrs. Option)
Name or brand of manufacturer.
Kind of pipe, that is, Continuous Welded, Electric-Resistance-Welded A, Electric-Resistance-Welded B, Seamless A; or Seamless B; XS for extra strong, XXS for double extra strong.
ASTM A53
Length of pipe. |
| General Information |
Couplings -- Applied handling tight. Couplings, 2" and smaller straight tapped, other sizes taper tapped.
Thread Protection -- Applied to pipe 4" and large.
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. |