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D5365-23 – Standard Test Method Technical Guide
📐 Test Scope and Terminology
This standard (D5365-23) specifies a method for determining the long-term ring-bending strain (Sb) of fiberglass pipe, including glass-fiber-reinforced thermosetting resin pipe (RTRP) and glass-fiber-reinforced polymer mortar pipe (RPMP). The test values are reported in inch-pound units. Terminology aligns with ASTM D883 and D1600, with key definitions including “end point” (catastrophic failure) and “fiberglass pipe” (glass-fiber reinforcements in thermosetting resin).
Note: There is no known ISO equivalent to this standard.
⚙️ Test Procedure and Data Analysis
A minimum of 18 pipe ring specimens are submerged in a controlled fluid environment and subjected to increasing deflections under constant load. The time to failure is recorded, and failure strain is analyzed via log-log linear regression to extrapolate the long-term ring-bending strain to 50 years. This method is considered conservative and representative of standard industry practice.
| 🟦 Parameter | 📏 Specification |
|---|---|
| Number of Specimens | 18 minimum |
| Test Environment | Submerged in controlled fluid |
| Loading | Constant load deflection |
| Data Analysis | Log-log linear regression |
| Extrapolation Target | 50 years |
Tip: The log-log regression provides conservative long-term strain estimates.
📊 Significance and Applications
The test determines the long-term ring-bending strain critical for designing buried fiberglass pipe. Chemical environment effects are accelerated by strain from deflection, providing essential data for performance evaluation. Failure is typically characterized by sudden fracture through the pipe wall.
| 🎯 Key Term | ⚡ Definition |
|---|---|
| End Point | Failure of specimen, often sudden fracture |
| Fiberglass Pipe | Glass-fiber reinforcements in thermosetting resin |
| RPMP | Fiberglass pipe with aggregate |
| RTRP | Fiberglass pipe without aggregate |
❓ Frequently Asked Questions
🔍 What is the long-term ring-bending strain?
It is the strain resistance of fiberglass pipe under constant load deflection, extrapolated to 50 years using log-log regression.
💡 How is the test conducted?
Specimens are submerged in fluid, deflected under constant load, and time to failure is monitored. Data is analyzed statistically.
⚡ Why is this test necessary?
It provides design data for buried fiberglass pipe, accounting for chemical environment effects accelerated by strain.
📌 What pipe types are included?
Both RTRP (without aggregate) and RPMP (with aggregate) are covered.