rating of Flanges
rating of Flanges
(OP)
why rating of flanges 150# 300# 400# .what is the significance of these number.
And the significance rating numbers in socket fittings(3000#6000#), and threaded fittings(2000#,6000#)!
And the significance rating numbers in socket fittings(3000#6000#), and threaded fittings(2000#,6000#)!





RE: rating of Flanges
It is just a Title with a written set of conditions and authority.
The higher "Rank" the more control, power, responsibility and capability.
Flange Ratings (and fitting ratings) are not all that different. They are just "Titles" given to groups of objects that have specific Design and Performance capabilities.
RE: rating of Flanges
RE: rating of Flanges
David Simpson, PE
MuleShoe Engineering
"Belief" is the acceptance of an hypotheses in the absence of data.
"Prejudice" is having an opinion not supported by the preponderance of the data.
"Knowledge" is only found through the accumulation and analysis of data.
RE: rating of Flanges
But us 'Old Guys' still call it a "150-pound" flange.
RE: rating of Flanges
And a Class 3000 threaded fitting is made from a Class 6000 fitting bodies that has been threaded [vs. socket-welded]. The Class 2000 threaded fittings are 3000 bodies that are threaded.
RE: rating of Flanges
David Simpson, PE
MuleShoe Engineering
"Belief" is the acceptance of an hypotheses in the absence of data.
"Prejudice" is having an opinion not supported by the preponderance of the data.
"Knowledge" is only found through the accumulation and analysis of data.
RE: rating of Flanges
Duwe6, I'm pretty sure that your statement quoted above is incorrect, although one could certainly make an acceptable 3000# threaded fitting from a forging intended for a 6000# SW presuming the socket ends are fully machined rather than partially forged first into the blanks. My opinion is based on observations of numerous properly marked threaded and socket welded 3000# fittings having the exact same exterior dimensions. The threaded 3000# fittings we receive routinely are not appreciably heavier than the SW ones at the same rating.
I don't have the standard handy but I'm pretty sure there are separate tables for threaded and SW fittings with different requirements for minimum wall thickness and hub diameter. I'm also again pretty sure from past evaluation that any 3000# threaded B16.11 fitting aside from perhaps a street elbow can have its female threads machined away to make an acceptable B16.11 3000# SW fitting, so that you can make SW x T couplings or threaded branch tees from the threaded versions for instance. I caution anyone to refer to B16.11 to confirm this first as it's again based only on my observation and recollection.
2000# fittings are a rarety here- we never see them because our local distributors don't stock them, any more than they stock the MSS 1000# forged analogs of 150# cast stainless threaded and socket-welding fittings: those too exist in a table somewhere but we've never seen one here.
RE: rating of Flanges
The reason I got involved in this minutia is that a Purchasing Agent specified 3000# THREADED forged fittings, and we ended up receiving plumb-bob weights and bass-boat anchors. 6000# bodies are very thick and heavy, ignorantly so. I got the Purchasing Spec changed ASAP.
RE: rating of Flanges
Our own local suppliers must be hungrier, because the 3000# SW and 3000# threaded fittings (both ordered as such) that we receive and stock have basically the same external dimensions (in the size range 1/2" to 2" which is all we use them in). They are nowhere near as heavy as the 6000# boat anchors you describe (which I've also seen- but only with the 6000# or 6M stamp on them). That's except for the SW reducing inserts, which pretty much look to be machined directly from bar from what I can tell, irrespective of rating.
I get to deal with this sort of minutia every day because we have no purchasing department- I buy my own materials for my projects. Fortunately, what I can get from stock locally feeds back into my specs, so we don't spec stuff we can't get quickly.