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D2662-96 – Standard Test Method Technical Guide
📐 Scope and Overview of ASTM D2662
ASTM D2662 – 96a established the comprehensive requirements for Polybutylene (PB) plastic pipe featuring a controlled inside diameter. Designated as SIDR-PR (Standard Inside Dimension Ratio – Pressure Rated), this specification was critical for ensuring long-term performance in pressurized water systems. The standard classified PB plastic pipe materials, provided a formal system of nomenclature, and outlined specific requirements and test methods for materials, workmanship, dimensions, sustained pressure, and burst pressure.
The standard was issued under the jurisdiction of ASTM Committee F-17 on Plastic Piping Systems and was approved for use by agencies of the Department of Defense. It specifically applied to pipe manufactured in standard thermoplastic pipe dimension ratios, with all values stated in inch-pound units regarded as the standard.
⚠️ Safety Caveat: This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
⚙️ Test Methods and Material Requirements
The mechanical performance of PB pipe per D2662 was rigorously validated through established ASTM test methods. Materials were required to conform to Specification D2581 for Polybutylene (PB) Plastics Molding and Extrusion Materials. Conditioning of test specimens was performed in accordance with Practice D618.
Primary performance tests included Test Method D1598 for Time-to-Failure under Constant Internal Pressure and D1599 for Short-Time Hydraulic Burst Pressure. The long-term hydrostatic design basis was obtained using Test Method D2837, while dimensional compliance was verified through Test Method D2122. These methods established the high confidence level required for the pipe’s specified Pressure Rating (PR).
💡 Technical Insight: The Hydrostatic Design Stress is defined as the estimated maximum tensile stress the material is capable of withstanding continuously. Combined with the SIDR, it serves as the fundamental basis for calculating the pipe’s Pressure Rating (PR). For PB compounds, this stress value is typically 1000 psi for water at 73°F.
📏 Dimensional Specifications: SIDR and Pressure Ratings
Because the pipe is inside diameter controlled, the Standard Inside Dimension Ratio (SIDR) is the governing ratio. The PR is derived directly from the material’s hydrostatic design stress and the specific SIDR schedule. The table below summarizes the key relationships for typical PB pipe as specified by the standard.
| 🟦 Standard SIDR | ⚡ Pressure Rating (PR) at 73°F [psi] | 📏 Typical HDS [psi] |
|---|---|---|
| 7 | 315 | 1000 |
| 9 | 250 | 1000 |
| 11 | 200 | 1000 |
| 13.5 | 160 | 1000 |
| 17 | 125 | 1000 |
All fittings, workmanship, and dimensional tolerances are strictly governed by the standard to ensure system compatibility and long-term integrity in service.
❓ Frequently Asked Questions
🔍 What does the acronym “SIDR” represent in ASTM D2662?
SIDR stands for Standard Inside Dimension Ratio. It is defined as the ratio of the specified inside diameter to the minimum wall thickness. This differs from SDR (Standard Dimension Ratio), which uses the outside diameter as the primary control dimension.
💡 What is the key difference between D2662 and outside diameter-controlled pipe standards?
The fundamental difference is control of the inside diameter versus the outside diameter. ASTM D2662 specifically governs PB pipe with controlled inside diameters (SIDR-PR), ensuring that the internal flow bore is maintained precisely, which is critical for hydraulic design and system capacity calculations.
⚡ How is the Pressure Rating (PR) determined under this standard?
The PR is calculated using the formula PR = 2 × S / (SIDR - 1), where S is the Hydrostatic Design Stress (e.g., 1000 psi for PB at 73°F) and SIDR is the Standard Inside Dimension Ratio. This ensures the pipe can withstand continuous internal water pressure with a high degree of certainty against failure.
📌 What specific ASTM test method is referenced for dimensional measurement?
All dimensional measurements for the pipe must be performed in accordance with Test Method D2122, which provides the standard procedures for determining the dimensions of thermoplastic pipe and fittings. This ensures uniformity in inspection and quality assurance.