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Flange Designations | |||
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Posted by: lumpidydumpy ® 10/22/2007, 14:50:04 Author Profile eMail author Edit |
What does the # rating mean in flange sizes? i.e. what does a 600# flange mean? I know the sizes, but what does the pressure class(lb.) mean? |
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Re: Flange Designations | |||
: Flange Designations -- lumpidydumpy | Post Reply | Top of thread | Forum |
Posted by: Jop ® 10/22/2007, 16:41:26 Author Profile eMail author Edit |
Look at this site. It is a Pressure/temperature chart for Flange ratings. I think you will "get-it" https://www.scsenergy.com/scsdataflgrating.htm |
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Posted by: lumpidydumpy ® 10/25/2007, 16:39:58 Author Profile eMail author Edit |
Yeah I already have that Chart Posted In my Cube, but I dont understand what the lb. designation is. I dont get why they call a 600 lb. flange 600 lb. |
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Posted by: JVan ® 10/25/2007, 19:23:14 Author Profile eMail author Edit |
If you go back far enough in history ( the following information is derived from " Marks Handbook, 4th edition, 1941) There were 3 classes of cast iron flanges rated as "American Standard"; 25 Lb, 125Lb and 250Lb.
These eventually evolved into the Schedule10, 40, 80, and 160 pipes that we have today.
At the time the engineer had to really design his system because the terms Standard pipe, Extra Strong Pipe etc. were dimensional standards, the pressure rating of the pipe was based on material and manufacturing. For instance Grade B seamless had a higher pressure rating than "Grade B Electric fusion welded steel per ASTMA155" but Grade B Electric fusion welded steel had almost the same pressure rating as "Lap-welded steel per ASTM A106. Marks lists 27 types of fabricated pipe from Seamless steel to Cast Iron and differentiates the cast iron as centrifugally cast or pit cast. An interesting side note, the size ranges included in the standard at the time..
125Lb. Flanges... 1" to 12" pipe then 14" O.D. to 96" O.D., the 96" used (68) 2 ¼" bolts on a 108 ½" bolt circle. Oil Field stuff. Hope this helps,
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