In order to determine flange pressure ratings, engineers make use of ASME/ANSI standards and codes such as ASME B16.5. This article provides an overview of how engineers use these standards and codes. It discusses subjects such as:Minimum standards for the thickness of the flangeMaterial that is permittedAllowable levels of stressASME dimensions for the flangeflange pressure classes issued by ASMEFlange material groups within the ASMEHow to determine the pressure-temperature ratings of flanges
Standards of the ASMEOffer Guidelines for Maintaining Pressure IntegrityTo ensure that piping systems are in compliance with the requirements for pressure integrity, engineers rely on the standards and codes established by ASME and ANSI
- The characteristics of pressure integrity can be determined with the help of these, and design rules can be simplified
- Among the most important standards are:The minimum wall thickness of the flangePermitted types of mediaStresses that are acceptableStandard components such as valves and flanges are not subject to any design rules that are provided by codes
- The design of their product is based on industry standards
- In order to ensure that components that are designed and manufactured according to the same standards will function in an equivalent manner, pressure integrity standards provide minimum performance criteria
- There is a distinction between pressure integrity and leakage integrity
- It ensures that there are no leaks, but it does not take into account all of the risks associated with structural stability
- Standardization of DimensionsGuarantee the ability to interchangeControlling the parameters of components through the use of dimensional standards helps to ensure that components manufactured by various suppliers can be physically interchanged
- The fact that a product conforms to ASME flange dimensions does not necessarily mean that it performs the same at all
Pressure-temperature ratings are included in the reference sections of a number of ASME piping component standards, such as ASME B16.5. Numerous Material Groups Are Covered by the ASME B16.5 Flange. B16.5 2017 of the ASME covers:16 groups of nonferrous metals totalHigh-alloy steel groups numbering tenEight groups of carbon steel and low-alloy steelThe ASME flange pressure class and rating are the same for all of the flanges in a group, regardless of the material. The pressure classes for B16.5 are as follows: 2500, 1500, 900, 600, 400, 300, and 150 meters. In the B16.47 Series B large diameter flanges, there is a class 75 designation. The Ratings of Pressure and TemperatureA Table-Based OrganizationThere are 44 tables, one for each material group, that contain the pressure-temperature ratings for the B16.5 flange. The ratings for group 2 are presented in table B2.1.1. Pressure classes are listed across the top of the tables, and temperatures are listed down the left. To make use of:Find the temperature and pressure that are required. Choose a material group for the flange. Make use of the table, and begin at the next higher temperature. Find the pressure rating for the class meeting.
The actual pressure-temperature rating of the flange is obtained from this class. For instance, according to Table B2.2, a Class 600 flange made of chrome material group 2.2 has a rating of 890 psig at 650 degrees Fahrenheit. Choosing the Appropriate ASMEThe Pressure Ratings for the ASME B16.5 Flange. If you want to determine flange ratings using B16.5, you will need to:Get the temperature and pressure that is required. Group of materials for the flangesSee if the right table contains that group. Beginning at a temperature higher than requiredFind the pressure rating for the class meeting. It is the class that provides the pressure-temperature rating for the flange. Because of this, the process of selecting the appropriate flanges is simplified. Assuring Dependability of Piping Systems Through Flange StandardsWhen it comes to designing dependable piping systems, engineers always rely on ASME/ANSI flange standards such as B16.5. Specifically, these rules govern:Thickness on the minimumComposition, Stresses, and DimensionsThe classes of pressureFormations of matterThe ratings of pressure and temperatureIn order to ensure that flanges can withstand the required temperatures and pressures, standards must be followed. An overview of how B16.5 simplifies the process of selecting flanges for pressure integrity is presented here.
