T/GZHG 023-2021 Polyethylene (modified anhydrous gypsum) double-wave peak reinforced drainage pipe

Scope

Main Technical Content: 5. Technical Requirements 5.1 The colors of the inner and outer layers of the color pipe should be uniform and consistent. The color is generally green, which can be agreed upon by both the supplier and the buyer. 5.2 The appearance of the pipe should be smooth and flat on both the inner and outer walls. It is not allowed to have air bubbles, cracks, obvious scratches, concavities, or discoloration lines. It is also not allowed to have ventilation grooves. The end face of the sleeve should be cut flat and perpendicular to the axis. 5.3 The length of the pipe is generally 6m, which can also be agreed upon by both the supplier and the buyer. The length of the pipe should include the length of the socket part. The length of the pipe should not have negative deviations. 5.4 The dimensions of the pipe should meet the requirements of Table 1. Table 1 Unit: mm Nominal inner diameter DN/ID Minimum average inner diameter dim, min Minimum laminated wall thickness e1 min Minimum inner wall thickness e min Minimum joint length Amin Minimum "U"-shaped groove depth Hmin Minimum socket wall thickness e 2 200 195 2.0 160 3.0 300 294 2.5 1.7 69 5.0 400 392 3.0 85.0 4.0 600 588 4.0 3.5 85.0 5.0 1000 985 6.0 140 14.0 6.0 1500 1485 5.0 178 18.0 6.0 5.5 **Classification** The pipes are classified according to their ring stiffness, as shown in Table 2. Table 2 Nominal ring stiffness grade Level SN8 SN10 SN12.5 Ring stiffness/(kN/m2) 8 10 12.5 5.6 Physical and Mechanical Properties 5.6.1 The physical and mechanical properties of the polyethylene (anhydrous phosphogypsum) composite modified material should meet the requirements of Table 3. Table 3 Material's physical and mechanical properties Serial number Item Unit Indicator Test method 1 Tensile strength MPa ≥20.7 6.4.1 Bending modulus MPa ≥800 6.4.2 MFR

Development Information

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