16Mo3 S/O Flanges

[yeoyeo]

First of all this is my first post so please be kind.
I am currently involved in a project where 16Mo3 S/O Flanges are required. We are based in teh U.K and have been told the U.K equivalent is 15Mo3.
However, after a week of frantic telephone calls I have not been able to source any 16/15Mo3 flanges
Can anyone tell me what the 16-15 relates to? is it carbon, as we have also been told that this is to attach to P235GH boiler plate tubes.
Also, if anyone has any contact details for any supplier based in U.K that supplies 16/15Mo3 SO flanges I'd be eternally grateful!
Alan

 

[MJCronin]

yeo....

I suggest that you search based on the ASTM equivalent...

I found a 16Mo3 steam trap with corresponding EIN and ASTM material designations. "16Mo3 materials are forged low alloy with an equivalent ASTM designation of A182-F1

http://www.konwell.fi/data/attachments/BK27N.pdf

I assume that you do not have a reference piping specification for the system and that you have been thrown into a situation with few references ? Is that true ?

At a maximum temperature of 450C, you might find that another low alloy material (F11 ?) may be acceptable.

If your system design temperature is less than 775F you may be able to use simple carbon steel materials for your flanges.

Tell us more...

-MJC

 

[Drexl]

Hi,

I think 16Mo3 is used as P235, but for higher temperatures. The high pressure/temperature pipes are usually welded, maybe that's why it's hard to find flanges.

 

[kalmari]

yeoyeo,
15Mo3 is the old German DIN-material grade which has been replaced in current European EN-material standards with grade 16Mo3.
Nowadays e.q. welding neck flanges and slip-on flanges are specified in EN1092-1. In this standard is some carbon steel grades (P250GH,...) which have at at least the same design stress values as your P235GH-pipe and could be also possible alternative. 16Mo3 is for little bit higher operating temperature (up to about 480degC).
Unfortunately the availability of flanges per EN1092-1 might be not yet very good. And in Europe slip-on flanges may be not so common used as welding neck flanges and at least from German stockist welding neck flanges per of 16Mo3-steel are available.
I assume that you might use the flanges in PED-solution. Then it is preferrable to use EN-materials not e.q. ASTM A182F1. For other than EN-materials you might need Particular Material Appaisal and toughness of ASTM materials might cause problems because ASTM material specifications does not state any toughness requirements for material.
Don't know about UK suppliers, but from Netherlands

http://www.vanleeuwen.com

you might get what you need. At least there is slip-on flanges of grade P250GH.