PO and PE Lined Pipe Fittings (1) F4 Lined Steel Pipes and Pipe Fittings; Nominal Diameter 25 ≤ DN ≤ 300mm, Each Length L ≤ 4000mm (2) PP Lined Steel Pipes and Pipe Fittings; Nominal Diameter 25 ≤ DN ≤ 300mm, Each Length L ≤ 4000mm (3) PO Lined Steel Pipes and Pipe Fittings; When 25 ≤ DN ≤ 50mm, L ≤ 2000mm; 65 ≤ DN ≤ 80mm, L ≤ 3000mm; 65 ≤ DN ≤ 300mm, L ≤ 4000mm Note: 1) When the nominal diameter DN ≥ 300mm, it falls under the equipment category. 2) If used under negative pressure conditions, please specify when ordering, and the lining will be constructed using negative pressure-resistant techniques. 3) If there are no special requirements for flanges, they shall comply with the HG20592-97 standard. For details, refer to the appendix. 4) Parameters for various standard pipe fittings are provided in the table. Other non-standard fittings, such as eccentric reducers and reducing elbows, can be custom-manufactured according to user requirements.