ASME Piping Standards

The American Society of Mechanical Engineers (ASME) has a series of standards providing information on the uses, designs, construction, repair and inspection of pipes and piping systems. The standards contain general information and information specific to particular industries.

Pipe Labels

ASME/ANSI Standard A13.1 contains guidelines for the use of labels on pipes. While the ASME standards are, in general, compatible with those issued by American National Standards Institute (ANSI), there may be additional requirements specified by either organization. The standard issued by both organizations require labels of a certain size and printing format be placed in specific locations, ANSI goes further and specifies color-coding based upon the materials contained within the pipe.

Pressure Piping

ASME B31 covers pipes carrying a number of materials under pressure. The B31 codes address such issues as the strength of pipes carrying corrosives and regulations for pipes within buildings. The integrity and construction requirements of pipes carrying gas are addressed. Regulations for pipes carrying hydrocarbons, slurry from construction, chemicals and uses related to electrical power are also addressed.

Materials and Joining Pipes

The ASME standards give specific requirements for pipes based on design of the system and materials from which they are constructed. Such regulations include the pipe, materials and methods used to join the sections. The materials used to construct flanges have specific requirements. These materials include stainless steel, carbon steel, bronze and cast iron. Materials used in the pipes include metal, plastic and fiberglass.

ASME Boiler and Pressure Vessel Code (BPVC)

The largest ASME standard, both in size and in the number of volunteers involved in its preparation, is the ASME Boiler and Pressure Vessel Code (BPVC). BPVC is a standard that provides rules for the design, fabrication, and inspection of boilers and pressure vessels. It is reviewed every three years. The BPVC consists of twelve volumes. Stamps for defining and certification of a boiler and a pressure vessel according to the ASME code include some of the more common S, U, U2 and U3 of many.

NPS tables for selected sizes

NPS ⅛ TO NPS 3½

NPS DN OD
[IN (MM)]
WALL THICKNESS
[IN (MM)]
SCH 5 SCH 10S/10 SCH 30 SCH 40S/40
/STD
SCH 80S/80
/XS
SCH 120 SCH 160 XXS
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)
10 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)
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)
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)
65 2.875 (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)
3 80 3.500 (88.90) 0.083 (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)
90 4.000 (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)

Note:
美国机械工程师协会 (ASME)(American Society of Mechanical Engineers)成立于1880年。现今已成为一家拥有全球超过125,000会员的国际性非赢利教育和技术组织。由于工程领域各学科间交叉性不断增长,ASME出版物也相应提供了跨学科前沿科技的资讯。涵盖的学科内容包括:基础工程)、制造、系统设计等方面。

Basic Engineering: Energy Conversion, Energy Resources, Environment and Transportation, General Engineering, Materials and Structures; Manufacturing: Materials Handling Engineering, Plant Engineering and Maintenance, Process Industries, Manufacturing Engineering, Textile Engineering; Systems and Design: Computers in Engineering, Design Engineering, Dynamic Systems and Control, Electrical and Electronic Packaging, Fluid Power Systems and Technology, Information Storage and Processing Systems.

 

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