Flanges in Duplex - UNS S31803 & S32205Flanges in Super Duplex - UNS S32750 & S32760Flanges in 6 Moly - UNS S31254, N08925 & N08926Flanges in Copper Nickel UNS C70600 C70620 C7060X C7150 C71520 C71640
Slip-On FlangesSlipped
over pipe and then welded both inside and outside to provide sufficient
strength and prevent leakage. Used in preference to weld necks due to
lower cost and less accurate requirements when cutting the pipe to
length.
Blind FlangesWithout
a bore, the blind flange is used to shut off a piping system or vessel
opening. Permits easy access for inspection purposes. Can be supplied
with or without hubs at the manufacturer’s option.
Weld-Neck FlangesDesigned
to be joined to a piping system with butt welding. Although relatively
expensive due to long neck, preferred for high stress applications. The
bore of the flange matches the bore of the pipe, reducing turbulence and
erosion.
Threaded FlangesSimilar
to slip-on but bore is threaded enabling assembly without welding which
obviously limits use to relatively low pressure systems. May be welded
along joint after assembly, but not considered satisfactory method of
increasing applications.
Socket Weld FlangesSimilar
to slip-on in outline but bore is counter-bored to accept pipe with the
diameter of the remaining bore the same as the inside diameter of the
pipe. Attached to the pipe by a fillet weld around the hub and an
optional interval weld can be applied in high stress applications. Often
used in high pressure systems such as hydraulics & steam lines.
Lap-Joint FlangesSimilar
to slip-on flange, but has a radius at the intersection of the bore and
the flange face to accommodate a lap stub end. Face on stub end forms
the gasket face of the flange. Used when sections of piping needs to be
dismantled quickly and easily for inspection or replacement.
Orifice FlangesProvides
access for metering off gases or liquids. Clamps between a pair of
flanges when installed in line and is referred to as an orifice flange
union. Jack-screws facilitate removal of orifice plate.
Spectacle BlankAlso
called a Figure 8 Blank, the Spectacle Blank is a pressure retaining
plate with one solid end and one open end connected with a web or
tie-bar. Open end forms seal between two flanges for normal flow of
fluid through pipe work, and swinging solid end into position halts
flow.
