ANSI and ASME are same?? 3

[Michael2009]

Hi all,

I always confuse when chosing a flange or thermowell flange. I always see piping like to use ASME standard and flange always refer to ANSI standard...

Does it mean ANSi and ASME are the same? so which mean 1" 150lbs ANSI and ASME are same in term of dimension and mechanical properties.

Any expert please corret me...
thanks

 

[DSB123]

Michael1983,
Just do a search on any Standards providers website for ANSI B16.5 - You will not find such a standard because there is not one. Many years ago there was a standard ANSI B16.5 but it was taken over/adopted by ASME and since then the Standard is ASME B16.5 but there are still people referencing ANSI B16.5 which is incorrect - to be pedantic. There are also others which have changed from ANSI to ASME and are still being miss-quoted in documents.

 

[Michael2009]

So actually ASME B16.5 are same as ANSI B16.5???

I did compare some standard table for flange dimension of ASME B16.5and ASNI B16.5.
when ASME B16.5 flange go until norminal pipe size more than 24" they are no longger same dimension with ASNI B16.5...why??

please correct me..if i wrong.
thank in advanced.

 

[KENAT]

Some former ANSI standards are now under the authority of ASME as DSB123 says. When they get updated they generally become ASME stds.

While I don't know about the specific standard you mention, generally it would more be the case that the ASME std is the replacement for the ANSI std, that than the same as.

Posting guidelines faq731-376

http://eng-tips.com/market.cfm?

(probably not aimed specifically at you)
What is Engineering anyway: faq1088-1484​

 

[jte]

Michael-

I'd suggest you get a copy of ASME B16.5 - ideally the 2009 edition, but something less than 20 years old will work. Read the standard - focus on the Foreword which in the 2009 edition is on pages vi thru viii. The answers to your questions are in there.

Basically, once upon a time there was an ANSI B16.5. Then, in 1988 it became ANSI / ASME B16.5. Then, in 1996 it became ASME B16.5.

I don't quite understand the confusion regarding flanges with NPS greater than 24". Simply put, B16.5 has not included any flanges over 24" since at least the 1968 edition (which was USA Standard (USAS) B16.5).

jt

 

[JLSeagull]

In ASME B 16.5 observe the pipe size and flange nomenclature. Beginning with the title notice that piping sizes are show by NPS for nominal pipe size followed by the typical US line sizes NPS 1/2 through NPS 24. The flange ratings lack and reference to pound; instead use the prefix Class. So use NPS 1 Class 150 for your thermowell example. Note too that if this is a type 316 stainless steel thermowell the pressure rating for the stainless flange uses a specific table and that the pressure and temperature combinations for different materials differ too. These concepts apply to the piping standards, valve standards etc.

 

[Michael2009]

Some former ANSI standards are now under the authority of ASME as DSB123 says. When they get updated they generally become ASME stds.

While I don't know about the specific standard you mention, generally it would more be the case that the ASME std is the replacement for the ANSI std, that than the same as.

 

[Michael2009]

Some former ANSI standards are now under the authority of ASME as DSB123 says. When they get updated they generally become ASME stds.

While I don't know about the specific standard you mention, generally it would more be the case that the ASME std is the replacement for the ANSI std, that than the same as.

Thanks for you explanation. We getting more clear.

I'd suggest you get a copy of ASME B16.5 - ideally the 2009 edition, but something less than 20 years old will work. Read the standard - focus on the Foreword which in the 2009 edition is on pages vi thru viii. The answers to your questions are in there.

Basically, once upon a time there was an ANSI B16.5. Then, in 1988 it became ANSI / ASME B16.5. Then, in 1996 it became ASME B16.5.

I don't quite understand the confusion regarding flanges with NPS greater than 24". Simply put, B16.5 has not included any flanges over 24" since at least the 1968 edition (which was USA Standard (USAS) B16.5).

jt

Thank you

 

[Michael2009]

[qoute]In ASME B 16.5 observe the pipe size and flange nomenclature. Beginning with the title notice that piping sizes are show by NPS for nominal pipe size followed by the typical US line sizes NPS 1/2 through NPS 24. The flange ratings lack and reference to pound; instead use the prefix Class. So use NPS 1 Class 150 for your thermowell example. Note too that if this is a type 316 stainless steel thermowell the pressure rating for the stainless flange uses a specific table and that the pressure and temperature combinations for different materials differ too. These concepts apply to the piping standards, valve standards etc. [/qoute]

Noted.