LWN vs WN? 1

[turbotrip]

Hey so here's a stupid question for the day. If you were to explain the difference between LWN and WN flange to a highschool kid how would you do it? If you guys could even give me a link to read that would be great as I've tried googling and didnt come up with anything.

thanks

 

[turbotrip]

Also can both WN and LWN be self-reinforced? or only LWN

 

[TomBarsh]

A LWN is not defined in ASME B16.5, whereas the WN flange is.

The LWN is a commercial product. The catalog dimensions for the neck may (and do) vary with manufacturer, but the "flange" portion should meet the B16.5 dimensions and can use the B16.5 pressure ratings.

Per ASME Section VIII the hub of the WN cannot be used for reinforcing area, thus by definition it cannot be "self-reinforcing".

 

[SnTMan]

Actually, LWN's are defined in B16.5 as straight hubbed flanges.

Regards,

Mike

 

[austsa]

To attach a WNRF to a pressure vessel, a piece of pipe (same size & schedule as the flange) is required. So, whilst strictly speaking, the flange cannot be self-reinforcing, the flange can dictate whether a nozzle is self-reinforcing or not.

A LWNRF on the other hand attaches directly to the vessel. That is, the nozzle neck is integral part of the flange. The OD, ID, and thickness are typically (always?) larger than a WNRF. Thus, LWN does far more reinforcing than WN, and thus has a much better chance of being self-reinforcing.

austsa

 

[rhg]

to explain the difference between LWN and WN flange to a highschool kid:


Nozzle with LWNF (straight hub welding flange as per ASME B16.5): ONE PIECE PART, no weld, self-reinforced

Nozzle with WNRF: TWO PIECE PART, one weld between flange and pipe, may be self-reinforced.

Regards

rhg

 

[SnTMan]

Show 'em a picture of each?

 

[Guest102023]

Go to google images. Also google for manufacturer's brochures.

 

[EngAddict]

http://www.camaneng.com.au/catalogu...d=ANSI B16.5&subject=Flanges&category=Flanges

HH and X are usually equal and X is defined in ASME B16.5.