T/GMES 026-2024 Active

Main Technical Content: 7 Technical Requirements 7.1 Appearance 7.1.1 The inner and outer surfaces of the drip heads shall not have manufacturing defects such as bubbles, cracks, defects, severe deformation, bending, or clogged filter windows. Burrs and loose edges shall not exceed 0.05 mm. 7.1.2 The color of drip irrigation pipes and drip irrigation tapes is generally black, which can be specified in consultation with the client. The inner and outer walls should be uniform in color, and there should be no obvious unplasticized materials, impurities, bubbles, hanging material lines, or other appearance defects that affect their functionality. 7.1.3 The embedding of drip heads should be firm, flat, accurately positioned, and free from defects such as leaking, warping, or improper embedding. 7.1.4 The openings in the drip head frames should be correctly positioned and uniform, with no burrs, material debris, or residue around the perimeter. 7.2 Non-transparent drip irrigation pipes and tapes shall be opaque. 7.3 Dimensions and Tolerances 7.3.1 Dimensions and tolerance limits of drip irrigation pipes 7.3.1.1 The nominal outer diameter and tolerance limits of drip irrigation pipes shall comply with GB/T 19812.3-2017. 7.3.1.2 The nominal wall thickness and tolerance limits of drip irrigation pipes shall comply with GB/T 19812.3-2017. 7.3.2 Dimensions and tolerance limits of drip irrigation tapes 7.3.2.1 The nominal inner diameter and tolerance limits of drip irrigation tapes shall comply with GB/T 19812.3-2017. 7.3.2.2 The nominal wall thickness and tolerance limits of drip irrigation tapes shall comply with Table 1. 7.3.3 The deviation rate of the spacing between watering holes shall be within ±5%. 7.3.4 The length deviation rate, length, and number of sections per roll shall comply with Table 2. 7.4 Flow uniformity shall comply with GB/T 19812.3-2017. 7.5 The relationship between flow and inlet pre