General flange standards

All flanges are manufactured in accordance with industry-accepted standards.

ANSI
ASTM
DIN
AWWA
ASME

Flange - ASME B16.36, Orifice Flange (1/2"-24")

Flange - Industry Standard Flange (also called Large Diameter Flange) (26"-larger)

Industry Standard Flanges have no national standard code or are they covered by any governing body.


A blind flange is a solid disk used to block off a pipeline or to create a stop.
AWWA Standard flange
Flange - AWWA Standard Flange

AWWA C207

AWWA C207

ASME STANDARDS

ASTM STANDARDS

AWWA STANDARDS

MSS STANDARDS
ANSI & ASME B16.5 Pipe Flanges
ANSI & ASME B16.5 Pipe Flanges
What's the difference between ANSI B16.5 and ASME B16.5 standards?

ASME B16.5 and ASME B16.47 cover pipe flanges up to NPS 60 (B16.5 from 1/2" to 24" and B16.47 from 26" to 60"). ANSI B16.47 covers two series of flanges, Series A is equal to MSS SP-44-44, and Series B is equal to API 605 (API 605 has been canclled).

The B16.5 standard was first published by ANSI in 1973.  Prior to that it was an ASA standard.  In 1996 the standard changed to ASME B16.5.   For 10 years prior to the change, the standard included both and was listed as ANSI/ASME B16.5.  

So what's the difference?  The answer is there is no difference.  The ASA, ANSI and ASME have continually refined and broadened the B16.5 standard.  I'm sure there is a committee working on future enhancements right now.  

The current and correct standard is ASME B16.5.  ANSI B16.5 is common industry lingo and is still referred to extensively by architects, engineers, manufacturers and suppliers.  And although the ANSI B16.5 standard does not technically exist, it its understood as another way to say ASME B16.5.  

The B16.5 Standard defines the following:

  1. Dimensions
  2. Tolerances
  3. Materials
  4. Markings
  5. Pressure/Temperature Ratings
  6. Pressure Testing


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