钢管壁厚表示方法

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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(Sch)表示方法.doc

公称直径DN与钢管壁厚等级（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
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5.0
5.6
5.6
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7.1
8.0
8.0
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-
10.0
11.0
12.5
100
125
150
114.3
139.7
168.3
108
133
159
2.0
2.9
2.9
3.0
3.4
3.4
4.0
5.0
5.0
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5.0
5.0
5.6
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5.9
6.3
7.1
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8.8
10.0
11.0
16.0
17.5
22.2
17.5
22.2
25.0
20.0
25.0
28.0
22.2
28.0
32.0
350
400
450
500
550
600
355.6
406.4
457.0

std钢管壁厚等级std无缝钢管厚度表示方法

std钢管壁厚等级std无缝钢管厚度表示方法篇11.介绍STD钢管及其壁厚等级的概念2.说明STD无缝钢管的厚度表示方法3.提供具体的壁厚等级及对应厚度4.总结STD钢管壁厚等级和表示方法的重要性正文STD钢管是一种广泛应用于各种工程领域的无缝钢管，其壁厚等级和厚度表示方法对于工程设计和施工具有重要意义。

本文将详细介绍STD无缝钢管的壁厚等级和厚度表示方法。

首先，STD钢管的壁厚等级是根据管壁厚度来分类的，不同的等级对应着不同的管壁厚度。

在实际应用中，根据不同的工程需求和设计要求，需要选择相应的壁厚等级。

其次，STD无缝钢管的厚度表示方法一般采用“外径×壁厚”的方式来表示，例如“Φ108×4”，表示外径为108mm，壁厚为4mm的无缝钢管。

这种表示方法直观明了，方便施工人员根据需要进行选型和计算。

具体的壁厚等级及对应厚度可以根据相关国家标准或行业标准进行查询。

在选择STD无缝钢管时，需要根据工程要求和实际情况，选择合适的壁厚等级和对应的厚度。

篇21.介绍STD钢管及其壁厚等级的概念2.详细描述STD无缝钢管的厚度表示方法3.提供常见的STD无缝钢管壁厚等级示例正文STD钢管是一种广泛应用于各种工程领域的无缝钢管，其壁厚等级是为了满足不同工程需求而设定的。

在生产过程中，根据不同的标准和工艺，STD无缝钢管的壁厚会有所不同。

STD无缝钢管的厚度表示方法通常采用“外径×壁厚”的方式，例如“Φ100×5”表示外径为100毫米，壁厚为5毫米的无缝钢管。

这种表示方法直观明了，方便工程人员根据需求选择合适的无缝钢管。

在STD无缝钢管的壁厚等级中，常见的等级包括Sch10、Sch20、Sch40、Sch80等。

这些等级数字代表了不同的壁厚标准，数字越大，管壁越厚。

具体的壁厚尺寸需要根据不同的外径和等级查询相关标准。

篇31.介绍STD钢管及其壁厚等级的概念2.说明STD无缝钢管的厚度表示方法3.列举不同壁厚等级及其应用场景4.总结STD钢管壁厚的重要性及其选择依据正文STD钢管是一种广泛使用的金属管材，具有优良的强度和延展性。

SCH厚度

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，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：
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×1000
ANSI B36.10壁厚等级：Sch10、Sch20、Sch30、Sch40、Sch60、Sch80、Sch100、Sch120、Sch140、Sch160十个等级;
Sch在美标ASME/ANSI/APL的标准中表示壁厚的系列号.目前我国在钢管的进口钢管的业务经常遇到的表示方式,在我国的外企在工程管道安装中经常出现.在美标的壁厚表示符号中有标准STD,特厚XD,双特厚XXD等表示,与sch的表示是相同的,在表示壁厚符号的同时还附带系列号,如40 /60/ 80 /100/ 120/ 140 160,它们分别表示不同的壁厚系列.
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
<DN200mm的管子，Sch80相当于XS管。
3.以钢管壁厚尺寸表示壁厚系列

(整理)钢管壁厚分级表(GB标准)

16.0
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17.5
16.0
17.5
20.0
20.0
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13.0
13.0
13.0
13.0
13.0
13.0
20.0
22.2
25.0
28.0
30.0
32.0
25.8
28.5
30.0
32.0
-
-
28.0
30.0
36.0
40.0
-
-
32.0
36.0
40.0
45.0
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36.0
40.0
45.0
50.0
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650
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13.0
13.0
13.0
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950
1000
1050
965
1016
1067
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1020
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-
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-
-
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-
8.0
8.0
8.0
-
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10.0
10.0
10.0
-
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13.0
13.0
13.0
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1100

(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）
以上信息由鲁西外贸钢管有限公司提供，热诚欢迎广大客户与我公司合作.
咨询电话：************传真：************
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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×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。

(整理)公称直径DN与钢管壁厚等级(Sch)表示方法.

表一：项目基本情况；对于不锈钢壁厚系列有：5S、10S、40S、80S四个等级
规划编制单位应当在报送审查的环境影响报告书中附具对公众意见采纳与不采纳情况及其理由的说明。价值=支付意愿=市场价格×消费量+消费者剩余2）以管子重量表示，如STD(标准重量)，XS(加厚管)，XXS(特厚管)
（4）列出辨识与分析危险、有害因素的依据，阐述辨识与分析危险、有害因素的过程。3）以钢管壁厚尺寸表示，即“管外径×壁厚”，如φ89X4
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-
-
800
850
900
813
864
914
820
-
920
-
-
-
-
-
-
-
-
-
8.0
8.0
8.0
-
-
-
-
-
-
10.0
10.0
10.0
-
-
-
-
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-
13.0
13.0
13.0
-
-
-
-
-
-
-
-
-
-
-
-
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-
950
1000
1050
965
1016
1067
-
1020
-
-
-
-
-
-
-
-
-
-
8.0
8.0
8.0
8.0
8.0
8.0
8.0
10.0
-
-
10.0
10.0
11.0

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)。

钢管管径壁厚

钢管管径壁厚
钢管的管径和壁厚是钢管的重要参数，它们会影响钢管的承载能力、流体输送能力和使用寿命等。

管径是指钢管的外径，通常用毫米（mm）或英寸（in）表示。

常见的管径有20mm、25mm、32mm、40mm、50mm、65mm、80mm、100mm 等。

壁厚是指钢管的管壁厚度，通常用毫米（mm）表示。

壁厚的大小会影响钢管的强度和承载能力，一般来说，壁厚越大，钢管的强度和承载能力就越高。

常见的壁厚有2.0mm、2.5mm、2.75mm、3.0mm、3.25mm、3.5mm 等。

在选择钢管时，需要根据具体的使用场景和要求来选择合适的管径和壁厚。

如果是用于输送流体，需要考虑流体的流量、压力和流速等因素；如果是用于支撑结构，需要考虑结构的承重能力和稳定性等因素。

同时，还需要考虑钢管的材质、制造工艺和质量等因素，以确保钢管的使用寿命和安全性。

管道壁厚对照表

管道壁厚对照表
对照表如下：
三种测量钢管壁厚的⽅法
1.⽤钢管的壁厚表⽰，即“管外径×壁厚”，例如φ89x4
钢管的壁厚不可能到处都⼀样。

壁厚差的现象客观地存在于横截⾯和纵向管体内，即壁厚不均匀。

为了控制不均匀性，⼀些钢管标准规定了壁厚不均匀性的容许指标，通常规定为不超过壁厚公差的80％。

2.由管道计划号指⽰
对于碳钢管，Du壁厚有10个等级：sch10，zhi20、30、40、60、80、100、120、140（如果数字后跟s，则表⽰不锈钢管）。

适⽤于不锈钢壁厚系列：5S，10s，40s，80s四个等级。

3.以管重量表⽰，例如STD（标准重量），XS（加厚管），XXS（超厚管）。

扩展数据：
尺⼨
1.标称尺⼨：它是标准中指定的标称尺⼨，⽤户和制造商希望获得的理想尺⼨，以及合同中指⽰的订单尺⼨。

2.实际尺⼨：在⽣产过程中获得的实际尺⼨，通常⼤于或⼩于标称尺⼨。

⼤于或⼩于标称尺⼨的现象称为偏差。

3.仪表重量：每⽶重量= 0.02466 *壁厚*（外径壁厚）
偏差和公差
1.偏差：在⽣产过程中，由于实际尺⼨很难满⾜公称尺⼨的要求，即通常⼤于或⼩于公称尺⼨，因此该标准规定实际尺⼨之间存在差异和名义尺⼨。

如果差异为正，则称为正偏差；反之，则为正偏差。

如果差为负，则称为负偏差。

2.公差：标准中指定的正负偏差值的绝对值之和称为公差，也称为“公差带”。

偏差是有⽅向的，即“正”或“负”；公差不是定向的。

因此，将偏差值称为“正公差”或“负公差”是错误的。

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)。