How to Calculate ASME Flange Ratings Explained

ASME standards, including ASME B16.5, B16.47, B16.36, and B16.34, provide guidelines for the design, manufacturing, and testing of pipe flanges and flanged fittings. These standards play a crucial role in ensuring the safety and reliability of piping systems in various industries. One aspect that often confuses engineers and professionals is the presence of various flange ratings within these standards. This video aims to explain why there are different flange ratings in ASME standards, focusing on ASME B16.5, B16.47, B16.36, and B16.34 as primary examples.
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Understanding ASME Flange Ratings:
ASME B16.5 covers pipe flanges and flanged fittings in sizes ranging from NPS 1/2 to NPS 24 and includes multiple pressure-temperature ratings, such as 150, 300, 600, 900, 1500, and 2500. Similarly, ASME B16.47 covers large diameter steel flanges from NPS 26 to NPS 60 and includes Series A and Series B flanges with different pressure ratings. ASME B16.36 covers orifice flanges, while ASME B16.34 covers valves, both of which include flange specifications with varying pressure-temperature ratings.
Reasons for Variation:
Operating Conditions: The variation in flange ratings accounts for different operating conditions, including pressure and temperature, that piping systems may encounter. A higher flange rating indicates the flange's ability to withstand higher pressures and temperatures.
Material Compatibility: Flange ratings also consider the material compatibility of the flange and the piping system. Different materials have different mechanical properties, which affect their ability to withstand pressure and temperature.
Safety Factors: ASME standards incorporate safety factors to ensure that flanges are designed to operate safely under specified conditions. Higher flange ratings provide a greater margin of safety, especially in critical applications.
Application Specificity: Industries and applications may have specific requirements that necessitate different flange ratings. For example, high-pressure or high-temperature applications may require flanges with higher ratings to ensure system integrity.

[@lumacindia9848]

You make life simple. Than you Asad. your explanations are very precise

[@mdnzm31]

2:10 I will remember this video because of Eion musk

[@googleaccount518]

As in the table at 3:40 i might need to go with SS316 flange of rating 400# if my process temperature is 40 degree Celsius.So piping end will be CS 300# rated flange,however my instrumnet will have flange with SS316 material and 400# rating.so are these flange compatible as bolts hole,flange dia will be different.Additionally doesn it cause any galvanic corrosion?Thanks in advance

[@ravipankhaniya591]

Temprature and pressure relation are proposal right but your graph showing different 2:31