ASTM A252 Piling Pipe Technical Specification
Overview
ASTM A252 covers seamless and welded steel pipe piles used as structural foundations. The standard includes three grades based on yield strength, with Grade 1 being the most commonly specified for general piling applications. This pipe is specifically designed to withstand driving stresses and support vertical loads.
Grades & Minimum Mechanical Properties
| Grade | Yield Strength (min) | Tensile Strength (min) | Key Application |
|---|---|---|---|
| Grade 1 | 30,000 psi (205 MPa) | 50,000 psi (345 MPa) | General foundation piling |
| Grade 2 | 35,000 psi (240 MPa) | 60,000 psi (415 MPa) | Intermediate loads |
| Grade 3 | 45,000 psi (310 MPa) | 66,000 psi (455 MPa) | Heavy loads, challenging soils |
Note: No maximum yield or tensile strength is specified.
Manufacturing Process
Electric Resistance Welded (ERW) pipe is the most common type for piling applications due to:
Cost-effectiveness for large diameters
Availability in long lengths
Consistent wall thickness
Production: Hot-rolled steel coil → Forming → High-frequency welding → Sizing → Cutting → Optional end preparation
Standard Sizes & Dimensions
| Parameter | Typical Range | Common Wall Thickness |
|---|---|---|
| Outside Diameter | 6⅝" to 24"+ | 0.188" to 0.500"+ |
| Wall Thickness | No minimum specified | Determined by soil conditions & load |
| Length | Up to 100+ ft | Typically 30-80 ft sections |
Chemical Requirements
None specified for Grade 1-3. The standard is performance-based (mechanical properties), not chemistry-based. Steel must be weldable.
Testing Requirements
| Test | Requirement | Purpose |
|---|---|---|
| Tensile Test | 1 per 400 lengths or fraction | Verify mechanical properties |
| Flattening Test | 1 per 400 lengths or fraction (for ≤ 14" OD) | Check ductility and weld quality |
| Bend Test | Optional, per agreement | Additional weld quality check |
| Hydrostatic Test | Not required | Piling is not pressure pipe |
Key Design Considerations
For Piling Applications:
Driving Stresses: Pipe must withstand impact from pile hammers
Corrosion Protection: Often specified with protective coatings or cathodic protection
Soil Conditions: Wall thickness selected based on soil corrosivity and driving resistance
Splice Design: Field welding of sections requires qualified procedures
Load Capacity: Determined by soil properties, not just pipe strength
Common Applications
Foundation Piles for buildings and bridges
Retaining Wall Systems
Dolphins & Marine Structures
Earth Retention Systems
Slope Stabilization
Comparison with Structural Pipe (A500/A501)
| Parameter | ASTM A252 (Piling) | ASTM A500/A501 (Structural) |
|---|---|---|
| Primary Use | Foundation load transfer | Above-ground structural framing |
| Chemical Control | None required | Specific limits on elements |
| Testing Focus | Driving performance | Architectural fit and connections |
| Surface Finish | Mill scale acceptable | Often specified clean for painting |
| End Use | Buried or submerged | Exposed or enclosed in buildings |
Installation Notes
Driving Methods: Impact hammers, vibratory drivers, or jacking
Tips: May be open-ended or closed with driving shoes/plates
Inspection: Typically includes driving records and load testing
Filling: Often filled with concrete for added strength and corrosion protection
Ordering Information
Specify clearly: ASTM A252, Grade 1 ERW Pipe
Outside Diameter × Wall Thickness × Length
End condition (plain, beveled)
Protective coating requirements (if any)
Additional testing requirements
Summary
ASTM A252 Grade 1 ERW pipe provides an economical, readily available solution for driven pile foundations. Its strength is adequate for most soil conditions, and the lack of chemical requirements keeps costs low. Selection should be based on geotechnical analysis with consideration for driving stresses and long-term corrosion.
Note: For marine or highly corrosive environments, specify protective measures such as coatings, cathodic protection, or increased wall thickness for corrosion allowance.
