无缝钢管壁厚用STD是一种壁厚表示法
钢管壁厚
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．标准重量管,以STD表示B．加厚管，以XS表示C．特厚管，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。
补充：1、以管子表号(Sch．)表示壁厚系列这是1938年美国国家怔准协会ANSIB36.10(焊接和无缝钢管)标准所规定的。
管子表号(Sch．)是设计压力与设计温度下材料的许用应力的比值乘以1000，并经圆整后的数值。
即Sch .=P/[ó]t×1000 （1-2-1）式中P—设计压力，MPa；[ó]t—设计温度下材料的许用应力，MPa。
无缝钢管与焊接钢管的管子表号可查资料确定。
ANSI B36.10和JIS标准中的管子表号为；Sch10、20、30、40、60、80、100、120、140、160。
ANSI B36.19中的不锈钢管管子表号为：5S、10S、40S、80S。
管表号(Sch．)并不是壁厚，是壁厚系列。
实际的壁厚，同一管径，在不同的管子表号中其厚度各异。
不同管子表号的管壁厚度，在美国和日本是应用计算承受内压薄壁管厚度的Barlow公式计算并考虑了腐蚀裕量和螺纹深度及壁厚负偏差-12．5％之后确定的，如公式(1-2-2)和(1-2-3)所示。
tB=D0P/2[ó]t （1-2-2）t=[D0/2（1-0.125）×P/[ó]t]+2.54 （1-2-3）式中tB 、t——分别表示理论和计算壁厚，mmD0————管外径，mmP——设计压力，MPa[ó]t——在设计温度下材料的许用压力，MPa计算壁厚径圆整后才是实际的壁厚。
如果已知钢管的管子表号，可根据式（1-2-1）计算出该钢管所能适应的设计压力，即P=Sch..× [ó]t/1000 （1-2-4）例如，Sch40，碳素钢20无缝钢管，当设计温度为350oC时给钢管所能适应设计压力为：P=40×92/1000①=3.68 MPa中国石化总公司标准SHJ405规定了无缝钢管的壁厚系列并Sch．5S②，Sch．10，Sch．10s，Sch．20，Sch．20s，Sch．30，Sch．40，Sch。
公称直径DN与钢管壁厚等级表示方法
对于不锈钢壁厚系列有：5S、10S、40S、80S四个等级
2）以管子重量表示，如STD(标准重量)，XS(加厚管)，XXS(特厚管)
3）以钢管 壁厚尺寸表示，即“管外径×壁厚”，如φ89X4
钢管壁厚 分级表（GB标准）
公
外径(D)
公称壁厚
称
直
Sch
Sch
Sch
Sch
Sch
Sch
Sch
-
-
-
-
-
10.0
-
-
13.0
-
-
-
-
10.0
-
-
13.0
-
-
-
-
10.0
-
-
13.0
-
-
-
1168
-
-
-
-
8.0
-
-
1200
1219
1220
-
-
-
8.0
-
-
-
7.1
-
-
11.0
-
14.2
-
17.5
-
8.0
10.0
-
12.5
16.0
17.5
20.0
22.2
-
8.8
12.5
-
16.0
17.5
22.2
25.0
28.0
-
10.0
14.2
-
17.5
22.2
25.0
28.0
32.0
10.0
11.0
16.0
Sch
Sch
Sch
Sch
Sch
无缝钢管壁厚标准
无缝钢管壁厚标准选填,简要介绍文档的主要内容,方便文档被更多人浏览和下载。
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无缝钢管尺寸对照表（美标ANSI-日标JIS-德标DIN-英标BS-韩标KS）
⽆缝钢管尺⼨对照表（美标ANSI-⽇标JIS-德标DIN-英标BS-韩标KS）
钢管标号sch80表⽰什么意思？SCH20-SCH40-SCH80-SCH160 （附对照表）
表⽰英制管壁厚系列：
Sch.20----全称：Schedule 20
Sch.10s--带s的系列为不锈钢专⽤，碳钢不⽤。
举个例⼦：
2" sch.10s 表⽰2”接管的壁厚为2.9mm,材质为不锈钢；
2" sch.40 表⽰2”接管的壁厚为4.0mm。
顺便再说⼀下钢管壁厚的表⽰⽅法：
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: Sch＝P/[σ]t×1000
ANSI 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.标准重量管,以STD表⽰
b加厚管，以XS表⽰
c.特厚管，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。
⽆缝钢管尺⼨对照表
(美标ANSI-⽇标JIS-德标DIN-英标BS-韩标KS)。
SCH10、SCH40、SCH80系列对应的钢管壁厚
SCH10、SCH40、SCH80系列对应的钢管sch, ASTM主要看附件 ASTM管道标准对照表(公制)钢管的壁厚系列钢管壁厚的分级，在不同标准中所表示的方法也各不相同。
但主要有三种表示方法。
1．以管子表号(Sch．)表示壁厚系列这是1938年美国国家怔准协会ANSIB36.10(焊接和无缝钢管)标准所规定的。
管子表号(Sch．)是设计压力与设计温度下材料的许用应力的比值乘以1000，并经圆整后的数值。
即Sch .=P/[ó]t×1000（1-2-1）式中P—设计压力，MPa；[ó]t—设计温度下材料的许用应力，MPa。
无缝钢管与焊接钢管的管子表号可查资料确定。
ANSI B36.10和JIS标准中的管子表号为；Schl0、20、30、40、60、80、100、120、140、160。
ANSI B36.19中的不锈钢管管子表号为：5S、10S、40S、80S。
管表号(Sch．)并不是壁厚，是壁厚系列。
实际的壁厚，同一管径，在不同的管子表号中其厚度各异。
不同管子表号的管壁厚度，在美国和日本是应用计算承受内压薄壁管厚度的Barlow公式计算并考虑了腐蚀裕量和螺纹深度及壁厚负偏差-12．5％之后确定的，如公式(1-2-2)和(1-2-3)所示。
tB=D0P/2[ó]t（1-2-2）t=[D0/2（1-0.125）×P/[ó]t]+2.54（1-2-3）式中tB t——分别表示理论和计算壁厚，mmD0————管外径，mmP——设计压力，MPa[ó]t——在设计温度下材料的许用压力，MPa计算壁厚经圆整后才是实际的壁厚。
如果已知钢管的管子表号，可根据式（1-2-1）计算出该钢管所能适应的设计压力，即P=Sch..× [ó]t/1000（1-2-4）例如，库存Sch40，碳素钢20无缝钢管，当设计温度为350oC时给钢管所能适应设计压力为：P=40×92/1000①=3.68 MPa中国石化总公司标准SHJ405规定了无缝钢管的壁厚系列并Sch．5S②，Sch．10，Sch．10s，Sch．20，Sch．20s，Sch．30，Sch．40，Sch。
(GB标准)钢管壁厚等级(Sch)表示方法
（GB标准）钢管壁厚等级（Sch）表示方法
添加人：admin添加时间：2010-3-3 11:02:00 文章来源：中国钢管经贸网【大中小】
（GB标准）钢管壁厚等级（Sch）表示方法
钢管的壁厚等级系列的表示方法在不同标准中所表示的方法各不相同。
主要有三种表示方法：
1）以管子表号（Sch）表示：
对于碳钢管壁厚有：Sch10、20、30、40、60、80、100、120、140、160等10个等级（若数字后面加S，表示不锈钢管）；
对于不锈钢壁厚系列有：5S、10S、40S、80S四个等级
2）以管子重量表示，如STD(标准重量)，XS(加厚管)，XXS(特厚管)
3）以钢管壁厚尺寸表示，即“管外径×壁厚”，如φ89X4
钢管壁厚分级表（GB标准）
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钢管壁厚表示方法
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: Sch＝P/[σ]t×1000ANSI 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.标准重量管,以STD表示b.加厚管，以XS 表示c.特厚管，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,外径为8.625in=219 mm 壁厚为0.322in=8.1788mm没有8“SCH40 12” 8"SCH40 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 high 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 (NPT). The European designation equivalent to NPS is DN (diamètre nominal/nominal diameter), in which sizes are measured in millimetres.[2] The term NB (nominal bore) is also frequently used interchangeably with NPS.edit HistoryIn March 1927, the American Standards Association authorized a committee to standardize the dimensions of wrought steel and wrought iron pipe and tubing. 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 created 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 common use that this original intent could not be accomplished.[3][note 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), 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.[3]Stainless steel pipes, which were coming into more common use in the mid 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 walls, the smaller "S" sizes can not be threaded together fusion welded.[4]edit 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 standards 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 ⅛ to 12 inches, the NPS and OD values are different. For example, the OD of an NPS 12 pipe is actually 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 ⅛ to 12 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 fixed 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.[note 1]Some 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 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", 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.[1]Both polyvinyl chloride pipe (PVC) and chlorinated polyvinyl chloride pipe (CPVC) are made in NPS sizes.edit NPS tables for selected sizesedit NPS ⅛ to NPS 3½SCH 5SCH10s/10SCH 30SCH40s/40/STDSCH80s/80/XSSCH 120SCH160XXS⅛ 6 0.405(10.29)0.035(0.889)0.049(1.245)0.057(1.448)0.068(1.727)0.095(2.413)———¼ 8 0.540(13.72)0.049(1.245)0.065(1.651)0.073(1.854)0.088(2.235)0.119(3.023)———⅜10 0.675(17.15)0.049(1.245)0.065(1.651)0.073(1.854)0.091(2.311)0.126(3.200)———½ 15 0.840(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)¾ 20 1.050(26.67)0.065(1.651)0.083(2.108)0.095(2.413)0.113(2.870)0.154(3.912)—0.219(5.563)0.308(7.823)1 25 1.315(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)1¼ 32 1.660(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)1½ 40 1.900(48.26)0.065(1.651)0.109(2.769)0.125(3.175)0.145(3.683)0.200(5.080)—0.281(7.137)0.400(10.160)2 50 2.375(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)2½ 65 2.875 0.083 0.120 0.188 0.203 0.276 0.300 0.375 0.552edit NPS 4 to NPS 9NP S[5]DN[2]OD[in(mm)]Wall thickness[in (mm)]SCH5SCH10s/1SCH20SCH30SCH40s/4/STDSCH60SCH80s/8/XSSCH100SCH120SCH140SCH160XXS[5]4 14.500(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)4½ 1155.000(127.00)————0.247(6.274)—0.355(9.017)————0.710(18.034)5 1255.563(141.30)0.109(2.769)0.134(3.404)——0.258(6.553)—0.375(9.525)—0.500(12.700)—0.625(15.875)0.750(19.050)6 156.625(168.20.109(2.760.134(3.40——0.280(7.11—0.432(10.97—0.562(14.27—0.718(18.230.864(21.94edit NPS 10 to NPS 24NPS[5]Wall thickness[in (mm)]SCH 40 SCH 60SCH80s/XSSCH 80 SCH 100 SCH 120 SCH 140 SCH 16010 0.365(9.271)0.500(12.700)0.500(12.700)0.593(15.062)0.718(18.237)0.843(21.412)1.000(25.400)1.125(28.575)12 0.406(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)14 0.437(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)16 0.500(12.700)0.656(16.662)0.500(12.700)0.843(21.412)1.031(26.187)1.218(30.937)1.437(36.500)1.593(40.462)18 0.562(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)edit NPS 26 to NPS 36edit Additional sizes (NPS)。
钢管许用应力
钢管许用应力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．标准重量管,以STD表示B．加厚管,以XS表示C．特厚管,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;补充：1、以管子表号Sch．表示壁厚系列这是1938年美国国家怔准协会焊接和无缝钢管标准所规定的;管子表号Sch．是设计压力与设计温度下材料的许用应力的比值乘以1000,并经圆整后的数值;即Sch .=P/ót×1000 1-2-1式中P—设计压力,MPa；ót—设计温度下材料的许用应力,MPa;无缝钢管与焊接钢管的管子表号可查资料确定;ANSI 和JIS标准中的管子表号为；Sch10、20、30、40、60、80、100、120、140、160; ANSI 中的不锈钢管管子表号为：5S、10S、40S、80S;管表号Sch．并不是壁厚,是壁厚系列;实际的壁厚,同一管径,在不同的管子表号中其厚度各异;不同管子表号的管壁厚度,在美国和日本是应用计算承受内压薄壁管厚度的Barlow公式计算并考虑了腐蚀裕量和螺纹深度及壁厚负偏差-12．5％之后确定的,如公式1-2-2和1-2-3所示; tB=D0P/2ót 1-2-2t=D0/2×P/ót+ 1-2-3式中tB 、t——分别表示理论和计算壁厚,mmD0————管外径,mmP——设计压力,MPaót——在设计温度下材料的许用压力,MPa计算壁厚径圆整后才是实际的壁厚;如果已知钢管的管子表号,可根据式1-2-1计算出该钢管所能适应的设计压力,即P=Sch..× ót/1000 1-2-4例如,Sch40,碳素钢20无缝钢管,当设计温度为350oC时给钢管所能适应设计压力为：P=40×92/1000①= MPa中国石化总公司标准SHJ405规定了无缝钢管的壁厚系列并Sch．5S②, Sch．10,Sch．10s,Sch．20,Sch．20s,Sch．30,Sch．40,Sch;40s,Sch．60,Sch．80,Sch．100, Sch．120,Sch．140,Sch;160,如表1-2-9所示;2、以管子重量表示管壁厚度的壁厚系列美国MSS和ANSI规定的以管子重量表示壁厚方法,将管子壁厚分为；种：1标准重量管以STD表示；2加厚管以XS表示；3特厚管以XXS表示;<DN250mm的管子,Sch40相当于STD管;<DN200mm的管子,Sch80相当于XS管;3、以钢管壁厚尺寸表示壁厚系列中国、ISO和日本部分钢管标准采用壁厚尺寸表示钢管壁厚系列;例如：我国低压流体输送用焊接钢管的壁厚分为普通管和加强管、对于流体输送用焊接钢管；日本JIS标准的SGP和STPY焊接钢管系列等只规定实际厚度系列;对这类钢管规格的表示方法为管外径×壁厚;例如ф×;鑫海达管业有限公司专营:20号无缝钢管,45号结构无缝钢管,40cr机械加工用钢管,27simn液压无缝钢管,Q345流体无缝钢管,精密钢管等.主营钢管规格有：5mm1mm—1020mm200mm无缝钢管、外径38mm-127mm冷轧无缝钢管、外径127mm-377mm,壁厚16mm-100mm,外径精度±%,壁厚精度±5%热轧中厚壁无缝钢管、16Mn外径400—1600mm、壁厚20—60mm的大口径厚壁卷管,可定尺到16米及各种规格的无缝方管、异型无缝钢管等.27simn液压无缝钢管常备钢管种类有:结构用无缝钢管、流体用无缝钢管、液压无缝钢管、电力用无缝钢管、石油输送用无缝钢管、化肥设备用无缝钢管、煤矿用无缝钢管、不锈钢无缝钢管、化工用无缝钢管、纺织机械用无缝钢管、汽车；水利用无缝钢管,精密无缝钢管、光亮无缝钢管、军工医疗用无缝钢管、管道用无缝钢管、支柱用无缝钢管、合金无缝管、高压无缝管、大口径直缝焊管等;Q345流体无缝钢管适用于工程、煤矿、纺织、电力、锅炉、机械、军工等各个领域;20号无缝钢管无缝管材质:20、35、45、20G、40Cr、20Gr、16Mn-45Mn、27SiMn、Cr5Mo、12CrMoT12、12Cr1MoV、12Cr1MoVG、10CrMo910、15CrMo、35CrMo、40CrMo等;45号结构无缝钢管执行标准：GB/T8162-2008结构管、GB/T14975-2002结构用不锈钢无缝管、GB/T14976-2002流体输送用不锈钢无缝管、GB/T14976-2002流体输送用不锈钢无缝管、GB/T18984-2003低温管道用无缝钢管GB/T8163-2008流体管、GB3087-2008中低压锅炉管、GB5310-2008高压锅炉管、GB6479-2000化肥专用管、YB528-65石油钻探管、GB3639-83冷拔或冷轧精密无缝管、GB9948-2006石油裂化管、YB235-70地质钻探用管、GB3088-82汽车半轴套管.40cr机械加工用钢管鑫海达管业有限公司电话：传真：手机：联系人：贾建军,王鑫邮箱：网址：。
SCH10、SCH40、SCH80系列对应的钢管壁厚
SCH10、SCH40、SCH80系列对应的钢管壁厚产品标准标准SCH10、SCH40、SCH80系列对应的钢管sch, ASTM主要看附件ASTM管道标准对照表(公制)钢管的壁厚系列钢管壁厚的分级，在不同标准中所表示的方法也各不相同。
但主要有三种表示方法。
1．以管子表号(Sch．)表示壁厚系列这是1938年美国国家怔准协会*****.10(焊接和无缝钢管)标准所规定的。
管子表号(Sch．)是设计压力与设计温度下材料的许用应力的比值乘以1000，并经圆整后的数值。
即Sch .=P/[ó]t×1000 （1-2-1）式中P―设计压力，MPa；[ó]t―设计温度下材料的许用应力，MPa。
无缝钢管与焊接钢管的管子表号可查资料确定。
ANSI B36.10和JIS标准中的管子表号为；Schl0、20、30、40、60、80、100、120、140、160。
ANSI B36.19中的不锈钢管管子表号为：5S、10S、40S、80S。
管表号(Sch．)并不是壁厚，是壁厚系列。
实际的壁厚，同一管径，在不同的管子表号中其厚度各异。
不同管子表号的管壁厚度，在美国和日本是应用计算承受内压薄壁管厚度的Barlow公式计算并考虑了腐蚀裕量和螺纹深度及壁厚负偏差-12．5％之后确定的，如公式(1-2-2)和(1-2-3)所示。
tB=D0P/2[ó]t （1-2-2）t=[D0/2（1-0.125）×P/[ó]t]+2.54 （1-2-3）式中tB t――分别表示理论和计算壁厚，mmD0――――管外径，mmP――设计压力，MPa[ó]t――在设计温度下材料的许用压力，MPa计算壁厚经圆整后才是实际的壁厚。
如果已知钢管的管子表号，可根据式（1-2-1）计算出该钢管所能适应的设计压力，即P=Sch..× [ó]t/1000 （1-2-4）例如，库存Sch40，碳素钢20无缝钢管，当设计温度为350oC时给钢管所能适应设计压力为：P=40×92/1000①=3.68 MPa产品标准标准中国石化总公司标准SHJ405规定了无缝钢管的壁厚系列并Sch．5S②，Sch．10，Sch．10s，Sch．20，Sch．20s，Sch．30，Sch．40，Sch。
钢管壁厚表示方法
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: Sch＝P/[σ]t×1000ANSI 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.标准重量管,以STD表示b.加厚管，以XS 表示c.特厚管，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,外径为8.625in=219 mm 壁厚为0.322in=8.1788mm没有8“SCH40 12” 8"SCH40 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 high 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 (NPT). The European designation equivalent to NPS is DN (diamètre nominal/nominal diameter), in which sizes are measured in millimetres.[2] The term NB (nominal bore) is also frequently used interchangeably with NPS.edit HistoryIn March 1927, the American Standards Association authorized a committee to standardize the dimensions of wrought steel and wrought iron pipe and tubing. 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 created 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 common use that this original intent could not be accomplished.[3][note 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), 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.[3]Stainless steel pipes, which were coming into more common use in the mid 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 walls, the smaller "S" sizes can not be threaded together fusion welded.[4]edit 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 standards 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 ⅛ to 12 inches, the NPS and OD values are different. For example, the OD of an NPS 12 pipe is actually 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 reas on for the discrepancy for NPS ⅛ to 12 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 fixed 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.[note 1]Some 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 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", 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.[1]Both polyvinyl chloride pipe (PVC) and chlorinated polyvinyl chloride pipe (CPVC) are made in NPS sizes.edit NPS tables for selected sizesedit NPS ⅛ to NPS 3½SCH 5SCH10s/10SCH 30SCH40s/40/STDSCH80s/80/XSSCH 120SCH160XXS⅛ 6 0.405(10.29)0.035(0.889)0.049(1.245)0.057(1.448)0.068(1.727)0.095(2.413)———¼ 8 0.540(13.72)0.049(1.245)0.065(1.651)0.073(1.854)0.088(2.235)0.119(3.023)———⅜10 0.675(17.15)0.049(1.245)0.065(1.651)0.073(1.854)0.091(2.311)0.126(3.200)———½ 15 0.840(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)¾ 20 1.050(26.67)0.065(1.651)0.083(2.108)0.095(2.413)0.113(2.870)0.154(3.912)—0.219(5.563)0.308(7.823)1 25 1.315(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)1¼ 32 1.660(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)1½ 40 1.900(48.26)0.065(1.651)0.109(2.769)0.125(3.175)0.145(3.683)0.200(5.080)—0.281(7.137)0.400(10.160)2 50 2.375(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)2½ 65 2.875 0.083 0.120 0.188 0.203 0.276 0.300 0.375 0.552edit NPS 4 to NPS 9NP S[5]DN[2]OD[in(mm)]Wall thickness[in (mm)]SCH5SCH10s/1SCH20SCH30SCH40s/4/STDSCH60SCH80s/8/XSSCH100SCH120SCH140SCH160XXS[5]4 14.500(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)4½ 1155.000(127.00)————0.247(6.274)—0.355(9.017)————0.710(18.034)5 1255.563(141.30)0.109(2.769)0.134(3.404)——0.258(6.553)—0.375(9.525)—0.500(12.700)—0.625(15.875)0.750(19.050)6 156.625(168.20.109(2.760.134(3.40——0.280(7.11—0.432(10.97—0.562(14.27—0.718(18.230.864(21.94edit NPS 10 to NPS 24NPS[5]Wall thickness[in (mm)]SCH 40 SCH 60SCH80s/XSSCH 80 SCH 100 SCH 120 SCH 140 SCH 16010 0.365(9.271)0.500(12.700)0.500(12.700)0.593(15.062)0.718(18.237)0.843(21.412)1.000(25.400)1.125(28.575)12 0.406(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)14 0.437(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)16 0.500(12.700)0.656(16.662)0.500(12.700)0.843(21.412)1.031(26.187)1.218(30.937)1.437(36.500)1.593(40.462)18 0.562(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)edit NPS 26 to NPS 36edit Additional sizes (NPS)。