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1、钢管壁厚表示方法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: SchP/t1000ANSI B36.10壁厚等级：Sch10、Sch20、Sch30、Sch40、Sch60、Sch80、Sch100、Sch120、Sch140、Sch160十个等级;ANSI B36.19壁厚等级：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：a.标准重量
2、管,以STD表示b.加厚管， 以XS 表示c.特厚管， 以XXS表示。对于DN250mn的管子，Sch40相当于STD，DN200mm的管子,Sch80相当于XS。8SCH40:是DN200,外径为8.625in=219 mm 壁厚为0.322in=8.1788mm没有8“SCH40 12” 8SCH40 14的规格!Nominal Pipe SizeFrom Wikipedia, the free encyclopediaNominal Pipe Size (NPS) is a North American set of standard sizes for pipes used for h
3、igh or low pressures and temperatures.1 Pipe size is specified with two non-dimensional numbers: a nominal pipe size (NPS) for diameter based on inches, and a schedule (Sched. or Sch.) for wall thickness. NPS is often incorrectly called National Pipe Size, due to confusion with national pipe thread
4、(NPT). The European designation equivalent to NPS is DN (diamtre nominal/nominal diameter), in which sizes are measured in millimetres.2 The term NB (nominal bore) is also frequently used interchangeably with NPS.Contents 1 History 2 Application3 NPS tables for selected sizes3.1 NPS to NPS 33.2 NPS
5、4 to NPS 93.3 NPS 10 to NPS 243.4 NPS 26 to NPS 363.5 Additional sizes (NPS) 4 See also 5 Notes6 References6.1 Bibliography 7 External linksedit HistoryIn March 1927, the American Standards Association authorized a committee to standardize the dimensions of wrought steel and wrought iron pipe and tu
6、bing. At that time only a small selection of wall thicknesses were in use: standard weight (STD), extra-strong (XS), and double extra-strong (XXS), based on the iron pipe size (IPS) system of the day. However these three sizes did not fit all applications. The committee surveyed the industry and cre
7、ated a system of schedule numbers that designated wall thicknesses based on smaller steps between sizes,3 although IPS and NPS numbers remain equivalent.The original intent was that each schedule would relate to a given pressure rating, however the numbers deviated so far from wall thicknesses in co
8、mmon use that this original intent could not be accomplished.3note 1 Also, in 1939, it was hoped that the designations of STD, XS, and XXS would be phased out by schedule numbers, however those original terms are still in common use today (although sometimes referred to as standard, extra-heavy (XH)
9、, and double extra-heavy (XXH), respectively). Since the original schedules were created, there have been many revisions and additions to the tables of pipe sizes based on industry use and on standards from API, ASTM, and others.3Stainless steel pipes, which were coming into more common use in the m
10、id 20th century, permitted the use of thinner pipe walls with much less risk of failure due to corrosion. By 1949 thinner schedules 5S and 10S, which were based on the pressure requirements modified to the nearest BWG number, had been created, and other S sizes followed later. Due to their thin wall
11、s, the smaller S sizes can not be threaded together according to ASME code, but must be fusion welded.4edit ApplicationBased on the NPS and schedule of a pipe, the pipe outside diameter (OD) and wall thickness can be obtained from reference tables such as those below, which are based on ASME standar
12、ds B36.10M and B36.19M. For example, NPS 14 Sch 40 has an OD of 14 inches and a wall thickness of 0.437 inches. However the NPS and OD values are not always equal, which can create confusion. For NPS to 12 inches, the NPS and OD values are different. For example, the OD of an NPS 12 pipe is actually
13、 12.75 inches. To find the actual OD for each NPS value, refer to the tables below. (Note that for tubing, the size is always the actual OD.) For NPS 14 inches and up, the NPS and OD values are equal. In other words, an NPS 14 pipe is actually 14 inches OD.The reason for the discrepancy for NPS to 1
14、2 inches is that these NPS values were originally set to give the same inside diameter (ID) based on wall thicknesses standard at the time. However, as the set of available wall thicknesses evolved, the ID changed and NPS became only indirectly related to ID and OD.For a given NPS, the OD stays fixe
15、d and the wall thickness increases with schedule. For a given schedule, the OD increases with NPS while the wall thickness stays constant or increases. Using equations and rules in ASME B31.3 Process Piping, it can be shown that pressure rating decreases with increasing NPS and constant schedule.not
16、e 1Some specifications use pipe schedules called standard wall (STD), extra strong (XS), and double extra strong (XXS), although these actually belong to an older system called iron pipe size (IPS). The IPS number is the same as the NPS number. STD is identical to SCH 40S, and 40S is identical to 40
17、 for NPS 1/8 to NPS 10, inclusive. XS is identical to SCH 80S, and 80S is identical to 80 for NPS 1/8 to NPS 8, inclusive. XXS wall is thicker than schedule 160 from NPS 1/8 to NPS 6 inclusive, and schedule 160 is thicker than XXS wall for NPS 8 and larger.The S designation, for example NPS Sch 10S,
18、 most often indicates stainless steel pipes. However some stainless steel pipes are available in steel designations, so strictly speaking the S designation only differentiates B36.19M pipe from B36.10M pipe.1Both polyvinyl chloride pipe (PVC) and chlorinated polyvinyl chloride pipe (CPVC) are made i
19、n NPS sizes.edit NPS tables for selected sizesedit NPS to NPS 3NPS5DN2ODin (mm)Wall thicknessin (mm)SCH 5SCH 10s/10SCH 30SCH 40s/40/STDSCH 80s/80/XSSCH 120SCH 160XXS60.405 (10.29)0.035 (0.889)0.049 (1.245)0.057 (1.448)0.068 (1.727)0.095 (2.413)80.540 (13.72)0.049 (1.245)0.065 (1.651)0.073 (1.854)0.0
20、88 (2.235)0.119 (3.023)100.675 (17.15)0.049 (1.245)0.065 (1.651)0.073 (1.854)0.091 (2.311)0.126 (3.200)150.840 (21.34)0.065 (1.651)0.083 (2.108)0.095 (2.413)0.109 (2.769)0.147 (3.734)0.188 (4.775)0.294 (7.468)201.050 (26.67)0.065 (1.651)0.083 (2.108)0.095 (2.413)0.113 (2.870)0.154 (3.912)0.219 (5.56
21、3)0.308 (7.823)1251.315 (33.40)0.065 (1.651)0.109 (2.769)0.114 (2.896)0.133 (3.378)0.179 (4.547)0.250 (6.350)0.358 (9.093)1321.660 (42.16)0.065 (1.651)0.109 (2.769)0.117 (2.972)0.140 (3.556)0.191 (4.851)0.250 (6.350)0.382 (9.703)1401.900 (48.26)0.065 (1.651)0.109 (2.769)0.125 (3.175)0.145 (3.683)0.2
22、00 (5.080)0.281 (7.137)0.400 (10.160)2502.375 (60.33)0.065 (1.651)0.109 (2.769)0.125 (3.175)0.154 (3.912)0.218 (5.537)0.250 (6.350)0.343 (8.712)0.436 (11.074)2652.875 (73.03)0.083 (2.108)0.120 (3.048)0.188 (4.775)0.203 (5.156)0.276 (7.010)0.300 (7.620)0.375 (9.525)0.552 (14.021)3803.500 (88.90)0.083
23、 (2.108)0.120 (3.048)0.188 (4.775)0.216 (5.486)0.300 (7.620)0.350 (8.890)0.438 (11.125)0.600 (15.240)3904.000 (101.60)0.083 (2.108)0.120 (3.048)0.188 (4.775)0.226 (5.740)0.318 (8.077)0.636 (16.154)edit NPS 4 to NPS 9NPS5DN2ODin (mm)Wall thicknessin (mm)SCH 5SCH 10s/10SCH 20SCH 30SCH 40s/40/STDSCH 60
24、SCH 80s/80/XSSCH 100SCH 120SCH 140SCH 160XXS541004.500 (114.30)0.083 (2.108)0.120 (3.048)0.188 (4.775)0.237 (6.020)0.281 (7.137)0.337 (8.560)0.437 (11.100)0.531 (13.487)0.674 (17.120)41155.000 (127.00)0.247 (6.274)0.355 (9.017)0.710 (18.034)51255.563 (141.30)0.109 (2.769)0.134 (3.404)0.258 (6.553)0.
25、375 (9.525)0.500 (12.700)0.625 (15.875)0.750 (19.050)61506.625 (168.28)0.109 (2.769)0.134 (3.404)0.280 (7.112)0.432 (10.973)0.562 (14.275)0.718 (18.237)0.864 (21.946)757.625 (193.68)0.301 (7.645)0.500 (12.700)0.875 (22.225)82008.625 (219.08)0.109 (2.769)0.148 (3.759)0.250 (6.350)0.277 (7.036)0.322 (
26、8.179)0.406 (10.312)0.500 (12.700)0.593 (15.062)0.718 (18.237)0.812 (20.625)0.906 (23.012)0.875 (22.225)959.625 (244.48)0.342 (8.687)0.500 (12.700)edit NPS 10 to NPS 24NPS5DN2ODin (mm)Wall thicknessin (mm)SCH 5sSCH 5SCH richsSCH 10SCH 20SCH 30SCH 40s/STD1025010.75 (273.05)0.134 (3.404)0.134 (3.404)0
27、.165 (4.191)0.165 (4.191)0.250 (6.350)0.307 (7.798)0.365 (9.271)1230012.75 (323.85)0.156 (3.962)0.165 (4.191)0.180 (4.572)0.180 (4.572)0.250 (6.350)0.330 (8.382)0.375 (9.525)1435014.00 (355.60)0.156 (3.962)0.156 (3.962)0.188 (4.775)0.250 (6.350)0.312 (7.925)0.375 (9.525)0.375 (9.525)1640016.00 (406.
28、40)0.165 (4.191)0.165 (4.191)0.188 (4.775)0.250 (6.350)0.312 (7.925)0.375 (9.525)0.375 (9.525)1845018.00 (457.20)0.165 (4.191)0.165 (4.191)0.188 (4.775)0.250 (6.350)0.312 (7.925)0.437 (11.100)0.375 (9.525)2050020.00 (508.00)0.188 (4.775)0.188 (4.775)0.218 (5.537)0.250 (6.350)0.375 (9.525)0.500 (12.7
29、00)0.375 (9.525)2460024.00 (609.60)0.218 (5.537)0.218 (5.537)0.250 (6.350)0.250 (6.350)0.375 (9.525)0.562 (14.275)0.375 (9.525)NPS5Wall thicknessin (mm)SCH 40SCH 60SCH 80s/XSSCH 80SCH 100SCH 120SCH 140SCH 160100.365 (9.271)0.500 (12.700)0.500 (12.700)0.593 (15.062)0.718 (18.237)0.843 (21.412)1.000 (
30、25.400)1.125 (28.575)120.406 (10.312)0.562 (14.275)0.500 (12.700)0.687 (17.450)0.843 (21.412)1.000 (25.400)1.125 (28.575)1.312 (33.325)140.437 (11.100)0.593 (15.062)0.500 (12.700)0.750 (19.050)0.937 (23.800)1.093 (27.762)1.250 (31.750)1.406 (35.712)160.500 (12.700)0.656 (16.662)0.500 (12.700)0.843 (
31、21.412)1.031 (26.187)1.218 (30.937)1.437 (36.500)1.593 (40.462)180.562 (14.275)0.750 (19.050)0.500 (12.700)0.937 (23.800)1.156 (29.362)1.375 (34.925)1.562 (39.675)1.781 (45.237)200.593 (15.062)0.812 (20.625)0.500 (12.700)1.031 (26.187)1.280 (32.512)1.500 (38.100)1.750 (44.450)1.968 (49.987)240.687 (
32、17.450)0.968 (24.587)0.500 (12.700)1.218 (30.937)1.531 (38.887)1.812 (46.025)2.062 (52.375)2.343 (59.512)edit NPS 26 to NPS 36NPS5DN2ODin (mm)Wall thicknessin (mm)SCH 5sSCH 10sSCH 10SCH 20SCH 30SCH 40s/STDSCH 40SCH 80s/XS2665026.000 (660.400)0.312 (7.925)0.500 (12.700)0.375 (9.525)0.500 (12.700)2870
33、028.000 (711.200)0.312 (7.925)0.500 (12.700)0.625 (15.875)0.375 (9.525)3075030.000 (762.000)0.250 (6.350)0.312 (7.925)0.312 (7.925)0.500 (12.700)0.625 (15.875)0.375 (9.525)0.500 (12.700)3280032.000 (812.800)0.312 (7.925)0.500 (12.700)0.625 (15.875)0.375 (9.525)0.688 (17.475)0.500 (12.700)3485034.000
34、 (863.600)0.312 (7.925)0.500 (12.700)0.625 (15.875)0.375 (9.525)0.688 (17.475)3690036.000 (914.400)0.312 (7.925)0.625 (15.875)0.375 (9.525)0.750 (19.050)0.500 (12.700)edit Additional sizes (NPS)NPSDN2ODin (mm)Wall thickness in (mm)2255022.000 (558.800)?40100040.000 (1,016.000)?42105042.000 (1,066.80
35、0)42.00044110044.000 (1,117.600)?48120048.000 (1,219.200)48.00052130052.000 (1,320.800)?56140056.000 (1,422.400)?60150060.000 (1,524.000)?64160064.000 (1,625.600)?68170068.000 (1,727.200)?72180072.000 (1,828.800)?76190076.000 (1,930.400)?80200080.000 (2,032.000)?88220088.000 (2,235.200)? （注：文件素材和资料部分来自网络，供参考。请预览后才下载，期待你的好评与关注。）