ENW MATH Diamedr Graddfa pwysau Tymheredd canolig Safonau Cynnyrch PIBELL LLINELL FIBERGWYDR PWYSO UCHEL DN40-DN900 3.45Mpa-34.5Mpa ≤65.5℃ GRE TIWBING DN40-DN100 10Mpa-25Mpa ≤65 ℃-10Mpa-25Mpa ≤65-2005 2006 GRE CASING DN100-DN200 10MPa-25MPa ≤80℃ Q/SXD 002-2011 SY/T6267-2006 TIWBING SGRIN GRE DN100-DN250 10Mpa-25Mpa ≤136℃ ≤136 ℃ 1.6″-4″ 10Mpa-25Mpa ≤65.5℃ API 15HR-2001 SISO 14692:2002 SY...