钢管壁厚表示方法.doc

钢管壁厚表示方法有管子表号、钢管壁厚尺寸和管子重量三种方法1)是以管子表号"Sch"表示壁厚。管子表号是管子设计压力与设计温度下材料许用应力的比值乘以1000,并经圆整后的数值。即:Sch=P/[σ]t×:Sch10、Sch20、Sch30、Sch40、Sch60、Sch80、Sch100、Sch120、Sch140、Sch160十个等级;:Sch5s、Sch10s、Sch40s、Sch80s四个等级;2)以钢管壁厚尺寸表示中国、ISO、日本部分钢管标准采用3)是以管子重量表示管壁厚度,它将管子壁厚分为三种:,,,以XXS表示。对于DN≤250mn的管子,Sch40相当于STD,DN<200mm的管子,Sch80相当于XS。8"SCH40":是DN200,==“SCH4012”8"SCH4014"的规格!NominalPipeSizeFromWikipedia,thefreeencyclopediaNominalPipeSize(NPS)isaNorthAmericansetofstandardsizesforpipesusedforhighorlowpressuresandtemperatures.[1]Pipesizeisspecifiedwithtwonon-dimensionalnumbers:anominalpipesize(NPS)fordiameterbasedoninches,andaschedule(.),duetoconfusionwithnationalpipethread(NPT).TheEuropeandesignationequivalenttoNPSisDN(diamètrenominal/nominaldiameter),inwhichsizesaremeasuredinmillimetres.[2]ThetermNB(nominalbore)⅛toNPS3½(NPS)[edit]HistoryInMarch1927,:standardweight(STD),extra-strong(XS),anddoubleextra-strong(XXS),basedontheironpipesize(IPS),[3],plished.[3][note1]Also,in1939,itwashopedthatthedesignationsofSTD,XS,andXXSwouldbephasedoutbyschedulenumbers,monusetoday(althoughsometimesreferredtoasstandard,extra-heavy(XH),anddoubleextra-heavy(XXH),respectively).Sincetheoriginalscheduleswerecreated,therehav