DSAW(Duble-sided spiral submerged arc welded paipa) uiga: gaosiga faagasologa o paipa uelo e faigofie, maualuga le lelei, taugofie, atinae vave. O le malosi o le paipa faʻafefeteina e masani ona maualuga atu nai lo le paipa dsaw ma e mafai ona faʻaitiʻitia le gaosiga o paipa o paipa lapoa lapoa, oe...
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