ASTM A252 Standard: 16 Check Items

STANDARD: ASTM A-252-98

Standard Specification for Welded and Seamless Steel Pipe Piles

1. Scope

This specification covers nominal thickness of the wall steel pipe piles of cylindrical shape and applies to pipe piles in which the steel cylinder acts as a permanent load-carrying member, or as a shell to form cast-in-place concrete piles.

2. Materials and Manufacture

The piles shall be made by the seamless electric resistance welded, flash welded, or fusion welded process. The seams of welded pipe piles shall be longitudinal, helical-butt, or helical-lap.

NOTE 1—For welded pipe piles, the weld should not fail when the product is properly fabricated and installed and subjected to its intended end use.

3. Steel Fabrication Process

The steel shall be made by one or more of the following processes: open-hearth, basic-oxygen, or electric-furnace.

4. Steel Chemical Composition and Analysis

The steel shall conform to the following requirements as to chemical composition: 

Phosphorus, maximum (%) : 0.050

5. Mechanical Properties

Steel Grade	Yield strength aRt0,5  psi(MPa) minimum	Tensile strength aRm psi (MPa) minimum	Elongation Af % minimum
			in 8 in. (203.2 mm), min, %	in 2 in. (50.8 mm), min, %
Grade 1	30000 (205)	50000 (345)	18	30
Grade 2	35000 (240)	60000 (415)	14	25
Grade 3	45000 (310)	66000 (455)	/	20

6. Weights Per Unit Length

  6.1. USC units

 W1=10.69(D-t)t

  Note:
  W = weight per unit length, lb/ft,
  D = specified outside diameter, in., and
  t = specified nominal wall thickness, in.

 6.2. SI units   

W2=t(D-t)xC

  Note:
  W = weight per unit length, kg/m
  D = specified outside diameter, expressed in millimetres (inches)
  t  = the specified wall thickness, expressed in millimetres (inches);

  C = 0,024 66 for calculations in SI units

7. Weight Tolerance

The weight of any length of pile shall not vary more than 15% over or 5% under the nominal thickness weight. Each length shall be weighed separately.

8. Outside Diameter

The outside diameter of steel pipe piles shall not vary more than ±1% from the diameter specified.

For example, diameter 12inch=323.9mm, then within the diameter tolerance, the diameter range is 320.661~327.139mm.

9. Wall Thickness

The minimum wall thickness at any point shall not be more than 12.5% under the nominal wall thickness specified.

For example, thickness is 9.53mm, then within the thickness tolerance, the thickness could varies within 8.34mm ~ 10.72mm.

10. Pipe Length

Single random lengths		16 to 25 ft (4.88 to 7.62 mm), incl
Double random lengths		over 25 ft (7.62 m) with a minimum average of 35 ft (10.67 m)
Uniform lengths		length as specified with a permissible variation of +/- 1 in

11. Straightness and Surface 

• The finished pipe piles shall be reasonably straight and shall not contain imperfections in such number or of such character as to render the pipe unsuitable for pipe piles.
• Surface imperfections having a depth not in excess of 25 % of the specified nominal wall thickness shall be acceptable. It shall be permissible to establish the depth of such imperfections by grinding or filing.
• Surface imperfections having a depth in excess of 25 % of the specified nominal wall thickness shall be considered to be defects. It shall be permissible for defects not deeper than 331⁄3 % of the specified nominal wall thickness to be repaired by welding, provided that the defect is completely removed prior to welding.

12. Pipe Ends

• Pipe piles shall be furnished with plain ends.
• Unless otherwise specified, pipe piles shall have either flame–cut or machine–cut ends, with the burrs at the ends removed. Where ends are specified to be beveled, they shall be beveled to an angle of 30 +5, −0°, measured from a line drawn perpendicular to the axis of the pipe pile.

13. Test Specimens and Test Methods

The tension test specimens and test methods shall be in accordance with Test Methods and Definitions ASTM A 370.

14. Inspection

All tests and inspections shall be made at the place of manufacture prior to shipment, unless otherwise specified in the purchase order, and shall be so conducted as not to interfere unnecessarily with the operation of the works.

15. Mill Test Certification

The manufacturer shall furnish a certificate of compliance stating that the pipe pile was manufactured, tested, and inspected in accordance with the requirements of this specification (including year date) and any requirements specified in the purchase order, and was found to meet such requirements, and shall furnish a test report containing the results of the applicable heat analyses, product analyses, and tension tests.

16. Pipe Marking

Each length of pipe pile shall be legibly marked by stenciling, stamping, or rolling to show: the name or brand of the manufacturer; the heat number; the process of manufacture (seamless, flash welded, fusion welded, or electric resistance welded), the type of helical seam (helical-lap or helical-butt), if applicable; the outside diameter, nominal wall thickness, length, and weight per unit length; the specification designation (year date not required); and the grade.

For example:
HYSP  API 5L GR.B HEAT NO.1988  HFW  508MM X 9.53MM X 12000MM    117.14KG/M