This technical test report documents the empirical hydrostatic pressure validation performed at the ALFA AL-ARABIA Quality Control Laboratory in 3rd Industrial City, Jeddah, KSA. All thermoplastic pressure pipes manufactured under DIN 8062, ASTM D1785, and SASO 14/15 undergo 100% routine pressure sampling to verify hoop stress resistance, circumferential tensile strength, and long-term creep rupture resistance.
| Nominal Size (OD) | Pressure Class | Test Temp (°C) | Applied Test Pressure | Required Duration | Observed Result | Conformity Status |
|---|---|---|---|---|---|---|
| 110 mm (DN 100) | PN 16 (SDR 21) | 20°C | 67.2 bar (4.2x PN) | 1.0 Hour | No burst, No weeping, Zero leakage | PASSED |
| 160 mm (DN 150) | PN 16 (SDR 21) | 20°C | 67.2 bar (4.2x PN) | 1.0 Hour | No burst, No weeping, Zero leakage | PASSED |
| 200 mm (DN 200) | PN 10 (SDR 33) | 20°C | 42.0 bar (4.2x PN) | 1.0 Hour | No burst, No weeping, Zero leakage | PASSED |
| 110 mm (DN 100) | PN 16 (SDR 21) | 60°C | 16.0 bar (1.0x PN) | 1,000 Hours | Sustained stress > 10.0 MPa, No creep rupture | PASSED |
The internal circumferential hoop stress (σ) induced during hydrostatic pressurization is computed via the standard international ISO 1167 equation:
Where P is the hydrostatic test pressure (MPa), dem is the mean outside diameter (mm), and emin is the minimum measured wall thickness (mm). All ALFA test lots consistently achieve circumferential stresses ≥ 42.0 MPa at 20°C, verifying virgin resin molecular orientation.
