T/GZHG 038-2025 Modified anhydrous calcium sulfate-reinforced high density polyethylene (HDPE-PG) hexagonal structured wall pipe material

Scope

7 Technical Requirements 7.1 Color The colors of the inner and outer layers of phosphogypsum hexagonal pipes shall be uniform and consistent, generally blue, and other colors may be agreed upon by the supplier and the buyer. 7.2 Appearance The inner and outer surfaces of phosphogypsum hexagonal pipes shall be clean and smooth, without bubbles, indentations, impurities, or irregular ripples. The two ends of phosphogypsum hexagonal pipes shall be flat, perpendicular to the axis, and located in the trough area. The inner and outer walls of the trough area shall be tightly welded and not show any detachment. 7.3 Specifications and Dimensions 7.3.1 Length The effective length of phosphogypsum hexagonal pipes is generally 6 m, and other lengths may be determined by the supplier and the buyer through negotiation. There shall be no negative deviation in length. 7.3.2 Dimensions The specifications of phosphogypsum hexagonal pipes shall be expressed in nominal inner diameter (DN/ID). The dimensions shall comply with Table 3. **Table 3: Dimensions of Phosphogypsum Hexagonal Pipes (in mm)** **Nominal Inner Diameter (DN/ID)** **Minimum Average Inner Diameter (dim,min)** **Minimum Laminated Wall Thickness (emin)** **Minimum Inner Layer Wall Thickness (e1,min)** **Minimum Outer Layer Wall Thickness (e2,min)** **Minimum Joint Length (Amin)** 200 195 1.5 1.1 0.9 60 300 294 2.0 1.7 1.0 69 400 392 2.5 2.3 1.4 77 500 490 3.0 3.0 1.8 85 600 588 3.5 3.5 2.1 96 800 785 4.5 4.5 2.7 118 1000 985 6.0 5.0 3.0 140 1200 1185 8.0 5.0 3.0 162 1400 1385 8.0 5.0 3.5 170 1500 1485 8.0 6.0 4.0 178 1600 1585 8.0 6.0 4.0 190 1800 1785 14.0 6.0 4.0 228 2000 1985 16.0 6.0 4.0 240 2200 2185 16.0 6.0 4.0 252 7.4 Physical and Mechanical Properties The physical and mechanical properties of phosphogypsum he

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