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Free PDF of ASME B16.5-2017: Flanges and Flanged Fittings Standards


ASME B16.5 PDF 2017 Free Download: A Guide to Flanges and Their Applications




Flanges are devices used to connect pipes, valves, pumps, fittings, and other equipment in a piping system. They provide easy access for inspection, cleaning, modification, or replacement of the components. Flanges also allow for flexibility and alignment of the piping system.


However, not all flanges are created equal. There are many different types of flanges with different features, dimensions, ratings, and applications. To ensure a safe and reliable operation of a piping system, it is essential to know how to select, install, and maintain the appropriate flanges.




asme b16 5 pdf 2017 free download



One of the most widely used standards for flanges is ASME B16.5. This standard covers pipe flanges and flanged fittings from NPS 1/2 through NPS 24 in pressure classes from 150 to 2500. It specifies the materials, dimensions, tolerances, marking, testing, and methods of designating openings for flanges.


In this article, we will provide you with a comprehensive guide to ASME B16.5 PDF 2017 free download. We will explain the different types of flanges covered by this standard, their features, advantages, and applications. We will also show you how to read the flange dimension tables for different pressure classes and pipe sizes. Finally, we will discuss some common flange applications in various industries and sectors.


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how to read and interpret the tables of ASME B16.5 PDF for different types of Flanges and Fittings?


what are the differences between ASME B16.47 and ASME B16.5 PDF standards for large diameter steel Flanges?


what are the advantages and disadvantages of using ASME B16.36 PDF standard for orifice Flanges?


what are the applications and limitations of using ASME B31J PDF standard for stress intensification factors and flexibility factors for piping components?


what are the best practices and guidelines for using ASME B31G PDF standard for manual ultrasonic testing of pipeline welds?


Flange Types




The type of flange to be used for a piping application depends on several factors, such as the required strength, pressure rating, temperature range, corrosion resistance, ease of installation, cost-effectiveness, etc. ASME B16.5 covers seven basic types of flanges:


  • Welding Neck Flange



  • Long Welding Neck Flange



  • Slip On Flange



  • Threaded Flange



  • Socket Weld Flange



  • Lap Joint Flange



  • Blind Flange



In addition to these standard types of flanges, there are some special ones that are used for specific purposes or applications. These include:


  • Orifice Flange



  • Nipoflange



  • Swivel Flange



  • Expanding Flange



  • Reducing Flange



  • Elbow Flange



  • And others



Let's take a closer look at each type of flange and see how they differ from each other.


Welding Neck Flange




A welding neck flange (WNF) is a type of flange that has a tapered hub and a butt weld end. It is designed to be welded to the end of a pipe or fitting, creating a smooth transition from the flange to the pipe. The tapered hub provides reinforcement and strength to the flange, as well as alignment and sealing. The butt weld end allows for a full penetration weld, which ensures a leak-proof and high-pressure connection.


The advantages of using a welding neck flange are:


  • It can withstand high pressure, temperature, and stress without deformation or leakage.



  • It can be used for both corrosive and non-corrosive fluids, as well as for abrasive or erosive media.



  • It can be easily radiographed and inspected for defects or cracks.



  • It can be matched with any type of pipe schedule or wall thickness.



The disadvantages of using a welding neck flange are:


  • It is more expensive and heavier than other types of flanges.



  • It requires more welding and fabrication work, which increases the labor cost and time.



  • It may cause stress concentration at the base of the hub, which may lead to cracking or failure.



The applications of welding neck flanges include:


  • Petroleum and natural gas industries



  • Chemical and power plants



  • Nuclear and aerospace facilities



  • High-pressure and high-temperature systems



Long Welding Neck Flange




A long welding neck flange (LWNF) is a type of flange that has an extended hub and a butt weld end. It is similar to a welding neck flange, except that the hub length is longer. This allows for more flexibility and adjustment in the piping system, as well as better stress distribution. The extended hub also acts as a spacer or guide for the pipe or fitting, which reduces the bending moment and vibration.


The advantages of using a long welding neck flange are:


  • It can accommodate different pipe lengths and diameters without compromising the alignment or sealing.



  • It can reduce the number of welds and fittings required in the piping system, which lowers the cost and maintenance.



  • It can provide better support and stability to the piping system, especially in high-pressure and high-temperature applications.



The disadvantages of using a long welding neck flange are:


  • It is more expensive and heavier than other types of flanges.



  • It requires more welding and fabrication work, which increases the labor cost and time.



  • It may cause stress concentration at the base of the hub, which may lead to cracking or failure.



The applications of long welding neck flanges include:


  • Petroleum and natural gas industries



  • Chemical and power plants



  • Nuclear and aerospace facilities



  • High-pressure and high-temperature systems



Slip On Flange




A slip on flange (SOF) is a type of flange that has a slightly larger bore than the pipe or fitting it is connected to. It is designed to slip over the end of the pipe or fitting, leaving some space between them. The flange is then secured by two fillet welds, one on the inside and one on the outside. The fillet welds create a seal between the flange and the pipe or fitting, as well as provide strength to the connection.


The advantages of using a slip on flange are:



  • It is cheaper and lighter than other types of flanges.



  • It is easy to install and align, as it does not require precise cutting or machining of the pipe or fitting end.



  • It can be used for both corrosive and non-corrosive fluids, as well as for abrasive or erosive media.




The disadvantages of using a slip on flange are:



  • It has a lower pressure rating than other types of flanges, as it relies on the fillet welds for strength and sealing.



  • It may cause turbulence and erosion in the flow due to the gap between the flange and the pipe or fitting.



It may not be suitable for high-temperat


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