1, Numutkeun Klasifikasi Metode Produksi (1) Pipa Seamless - Pipa Gulung Panas, Pipa Gulung Tiis, Pipa Ditarik Tiis, Pipa Extruded, Jacking Pipa (2) Pipa Dilas (A) Saluyu sareng Sub-Prosés - Arc Welded Pipa, Pipa ERW (Frékuénsi Tinggi, Frékuénsi Rendah), Pipa Gas, Furn...
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