Din Flanges 1

[TomTucker]

I am working on fitting new air compressors to an existing system. On the drawing for the new compressors i have flanges DIN 2635 ND 40 C 32 - C 38, C28.8 and DIN 2633 C 32. ND is the pressure rating, C 32 - C 38 refers to the max OD of the pipe and C 28.8 the material. Is there a web site that will give me information as to what this material is? Also with the second flange the only information is DIN 2633 C 32, What does the C 32 refer to? ie size of pipe or material. Again is there a web site that will explain these abbreviations to me.
Many Thanks
Tom

 

[abcmex]

Tom,

Probably it is a PN40 (Nominal pressure rating 40 bar) but perhaps they used "Nenndruck = ND".

This DIN norm is for Welding neck Raise face flanges WNRF. The "C" is used some times to identify the sealing face ( C= Raised face).

32 and 38 are probably the diameters 32=1 1/4" and 38 1 1/2"

link:

http://www.stuess.de/index.html

use search function "VSF-PN40"

Still: ask for more information, the worst errors start in the interfaces.

Kind regards

 

[mashbob]

Dear Tom,

for sure i can say that that ND 40 is the nominal pressure for the flange equivalent PN 40 responds ANSI class 300. C32- C38 means chapter 32-38. C22.8 means forged steel DIN No 1.0460 or ASTM A-105.
The diameters according to DIN are the following:
1/2" - DN15; 3/4" - DN 20; 1" - DN25, 11/4" - DN32, 11/2" - DN40, 2" - DN50; 3" - DN80; 4" - DN100 ....

 

[sweddesign]

DIN 2635 is the form standard for PN 40 weldneck flanges.
ND is an old version for DN.
The material in standard CS flange is RSt 37.2 with carbon<= 0.20%.

 

[sweddesign]

Mashbob's material is correct for 40bar flanges .
RSt 37.2 is limited 120 deg C at lower pressures.

 

[TomTucker]

Many thanks for all the information. Happy New Year.
Regards
Tom