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D3567-17 – Standard Test Method Technical Guide
📏 Scope and Key Terminology of D3567-17
ASTM D3567-17 (Reapproved 2022) is the standard practice for determining the physical dimensions of “Fiberglass” (Glass-Fiber-Reinforced Thermosetting Resin) pipe and fittings. The practice specifically covers the measurement of outside diameter (OD), inside diameter (ID), total wall thickness, reinforced wall thickness, liner thickness, laying length, tapered dimensions, taper angles for socket joints, and procedures for gaging internal and external threads.
Precise terminology is essential for this standard. The reinforced wall thickness is defined as the total wall thickness minus the liner or exterior surface layer thickness, or both (Section 3.1.6). The liner and exterior surface layer serve as chemical and water barriers. Crucially, Section 3.1.4 specifies that these layers can only be measured as distinct components if their boundary limits are visually identifiable and their thickness is at least 0.005 in. (0.10 mm).
💡 Unit System Tip: Per Section 1.3, the values stated in inch-pound units are to be regarded as the standard. SI units in parentheses are provided for information only and are not the basis for compliance.
⚙️ Dimensional Measurement Procedures and Referenced Standards
This practice provides a structured approach to dimensional quality control. For tapered joints, specific procedures govern the measurement of taper angles to ensure proper fit with tapered socket fittings. For threaded pipe sections, the standard mandates conformance to recognized thread standards, specifically ANSI B2.1 (Pipe Threads) and API 5B (Threading, Gaging, and Thread Inspection).
| 🟦 Dimensional Feature | 📏 Standard / Procedure | 🎯 Key Criteria |
|---|---|---|
| Outside Diameter | Direct measurement | Foundation for wall thickness calculation |
| Taper Angle | Taper measurement procedure | Ensures socket joint compatibility |
| Internal/External Threads | ANSI B2.1 / API 5B | Conformance to standardized thread profiles |
| Laying Length | Linear measurement | Actual length added to line by fitting |
| Deviation from Straightness | Max deviation / specimen length | Straightness quality control metric |
⚠️ Wall Composition Alert: The liner and exterior surface layer must have visually identifiable boundary limits to be measured separately. If the boundary is