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11
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
5
Note:
SO = slip on and threaded; WN = welding neck; SW = standard wall.
a
Inner 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.
b
In 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.
c
Gaskets in these sizes are suitable for slip-on flanges only if the gaskets and flanges are assembled concentrically.
d
A nozzle is a long welding neck; the bore equals the flange NPS.
e
An NPS 24 gasket is suitable for nozzles.
*Spiral wound gasket dimensions for use on screwed or slip-on flanges – see Table 4.
FLANGE
SIZE
(NPS)
PRESSURE CLASS
75
150
300
400
600
900
1500*
2500*
1
/
2
3
/
4
1
1
1
/
4
1
1
/
2
2
2
1
/
2
3
4
6
8
10
12
14
16
18
20
24
No flanges
WN flange only
b
SO flange
c
WN flange
b
SO flange
c
WN flange, any bore
b
SO flange
WN flange, any bore
No flanges
Use Class 600
WN flange only
b
SO flange
c
WN flange
b
SO flange
c
WN flange,
any bore
SO flange
c
WN flange,
any bore
No flanges
Use Class 1500
WN flange only
b
WN flange with
Schedule 10S bore
described in ASME B36.19M
(includes nozzle
d
but excludes
SO flange)
WN flange with
Schedule 10S bore descibed
in ASME B36.19M
(excludes nozzle
d
and
SO flange)
e
No flanges
WN flange with SW bore
(includes nozzle
d
but excludes
SO flange
WN Flange with
Schedule 80 bore
(excludes nozzle
and
SO flange)