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LWN vs WN? - Boiler and Pressure Vessel engineering - Eng-Tips

May 04, 2012· 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.Also can both WN and LWN be self-reinforced? or only LWNA 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".Actually, LWN's are defined in B16.5 as straight hubbed flanges. Regards, MikeTo 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. austsato 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 rhgShow 'em a picture of each?1Go to google images. Also google for manufacturer's brochures.Boilers Explained | Worcester Boschhttps:// of boiler Combi Boilers. View our combi boilers A combination or 'combi' boiler is both a high efficiency water heater and a central heating boiler in a single compact unit. Combi boilers heat water directly from the mains when you turn on a tap, so you won't need a hot water storage cylinder or a cold water storage tank in the roof

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