What is an ANSI Class 150 Valve?
What is an ANSI Class 150 Valve?
(OP)
I have a valve design that has pressure/temperature ratings per B16.34. The valve is not designed per B16.34, but it is a proprietary design at B16.34 pressure / temperature ratings. Marketing wants to call it a "ANSI Class 150 Valve". Does this imply that the valve is made to B16.34 or that the valve is rated at ANSI Class 150 pressure/temperature ratings?
Also, where did the ANSI Class designations come from. I know they are listed in B16.34, B16.5 and B16.47, but were they originally developed in another standard? Does anyone know of a standard that defines the Class designations? I found some thread on here that imply that the Class designations originated in the Boiler and Pressure Vessel Code. Does anyone have any insight on these two subjects?
Thanks in advance.
Also, where did the ANSI Class designations come from. I know they are listed in B16.34, B16.5 and B16.47, but were they originally developed in another standard? Does anyone know of a standard that defines the Class designations? I found some thread on here that imply that the Class designations originated in the Boiler and Pressure Vessel Code. Does anyone have any insight on these two subjects?
Thanks in advance.





RE: What is an ANSI Class 150 Valve?
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Patricia Lougheed
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RE: What is an ANSI Class 150 Valve?
RE: What is an ANSI Class 150 Valve?
Good post but your advise may fall on deaf ears as from my experience there are 80% or more in the engineering fraternity who still refer to ANSI rather than the correct ASME.
RE: What is an ANSI Class 150 Valve?
It's usually because someone's been handed an old specification or drawing with the words "ANSI Class 150" and has never heard of that termonology.
In this case, I bet "Marketing" has a database that says if ordering valves per spec xyz, title it as "ANSI Class 150." The database has probably been around since the 1980's and incorporated information from the 60's or 70's... just my guess.
Patricia Lougheed
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RE: What is an ANSI Class 150 Valve?
Tend to agree with you. However there are those in engineering who do not keep up with the latest Codes. I am in the UK and constantly come across incorrect specifications being quoted "because it's been like that since Noah built the arc" and no checks are made to ensure Codes/Specs quoted are up to date one's.
RE: What is an ANSI Class 150 Valve?
RE: What is an ANSI Class 150 Valve?
RE: What is an ANSI Class 150 Valve?
Some of my co-workers believe that calling the valve an ANSI Class 150 implies that it is an ASME B16.34 valve. If I look at MSS SP-25 (Standard Marking System for Valves, Fittings, Flanges, and Unions) section 4.1, Rating Designation, I see: “The expression "Rating Designation" includes the intent of the expressions "Pressure Designation", "Service Designation", "Pressure Class", and similar terms used to define the pressure/fluid/materials temperature limitation of the product.” 4.1.1 further details Class as a rating designation: "The Rating Designation for products may be designated by the class numbers alone, e.g., a steam pressure rating or a pressure class designation." Is this valid documentation to support that Class 150 is a material/pressure/temperature rating designation?
Perhaps a better question is: What is the difference between an ANSI/ASME Class 150 Valve and an ANSI/ASME B16.34 Valve?
JLSeagul, I am feeling your insanity! This should be a simple subject with a simple answer... I am not the sharpest tack in the bunch, but I am by far not the dullest. There has to be something I am not seeing...
Thanks for all of your inputs.
RE: What is an ANSI Class 150 Valve?
RE: What is an ANSI Class 150 Valve?
RE: What is an ANSI Class 150 Valve?
RE: What is an ANSI Class 150 Valve?
I would assume that the title (ANSI 150) means nothing about how the valve operates or performs or if in fact it even had any internal parts. There are valves out there that do not "meet" either B16.34 or API 6D, but "performance" based testing has shown they do their intented service and will not fail. The valve manufacturer can always do the performnce based testing and publish their exceptions to API 6D that they do not comply with. This is what compressor manufacturers do all the time as very few compressor operators need 100% compliance with the standard.
As with any part failure, the manufacturer will be liable, the extent of liable all the way to criminal will be judged and only the OP's lawyers can give the OP that kind of opinion.
RE: What is an ANSI Class 150 Valve?
Patricia Lougheed
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