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MAXIMUM BORE OF ASME B16.5 FLANGES FOR USE WITH STYLE CG & CGI SPIRAL WOUND GASKETS This table shows the maximum bore of flanges for which the spiral-wound gasket dimensions shown are recommended considering the tolerances involved, possible eccentric installation, and the possibility that the gasket may extend into the assembled flange bore. TABLE FLANGE PRESSURE CLASS SIZE 5 (NPS) 75 150 300 400 600 900 1500* 2500* 1/ 2 3/ b 4 WN flange only WN flange onlyb 1 No flanges 11/ b 4 WN flange only SO flangec c Use Class1500 No flanges SO flange WN flangeb b 1 Use Class 600 WN flange 1 /2 2 c SO flangec SO flange WN flange, any boreb WN flange, 21/ 2 any bore SO flangec 3 WN flange, any bore WN flange with SW bore d 4 (includes nozzle but excludes No flanges SO flange 6 WN flange with Schedule 10S bore 8 described in ASME B36.19M (includes nozzled 10 but excludes SO flange SO flange) WN flange, any bore 12 WN Flange with 14 Schedule 80 bore (excludes nozzle 16 WN flange with and Schedule 10S bore descibed SO flange) 18 in ASME B36.19M No flanges (excludes nozzled and 20 SO flange)e 24 Note: SO = slip on and threaded; WN = welding neck; SW = standard wall. aInner rings are required for Class 900 gaskets, NPS 24; Class 1500 gaskets, NPS 12 through NPS 24; and Class 2500 gaskets; NPS 4 through NPS 12. These inner rings may extend into the pipe bore a maximum of 0.06 inch (1.5 millimeters) under the worst combination of maximum bore, eccentric installation, and additive tolerances. bIn these sizes the gasket is suitable for welding-neck flange with a standard-wall bore, if the gasket and the flanges are assembled concentrically. This also applies to nozzle. It is the user's responsibility to determine if the gasket is satisfactory for a flange of any larger bore. cGaskets in these sizes are suitable for slip-on flanges only if the gaskets and flanges are assembled concentrically. dA nozzle is a long welding neck; the bore equals the flange NPS. eAn NPS 24 gasket is suitable for nozzles. *Spiral wound gasket dimensions for use on screwed or slip-on flanges � see Table 4. 11
Goodyear Rubber Products
