Forms > Flanges
Flanges
Flanges in Duplex - UNS S31803 & S32205
Flanges in Super Duplex - UNS S32750 & S32760
Flanges in 6 Moly - UNS S31254, N08925 & N08926
<Maximum Pressures>
Flange Types
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Slip-On Flanges |
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Slipped 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. |
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Blind Flanges |
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Without 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. |
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Weld-Neck Flanges |
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Designed 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. |
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Threaded Flanges |
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Similar 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. |
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Socket Weld Flanges |
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Similar 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. |
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Spectacle Blank |
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Also 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. |
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Lap-Joint Flanges |
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Similar 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. |
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Orifice Flanges |
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Provides 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. |
Maximum
Allowable non-shock Pressure (psig) |
Temperature
(oF) |
Pressure Class (lb.) |
150 |
300 |
400 |
600 |
900 |
1500 |
2500 |
Hydrostatic Test
Pressure (psig) |
450 |
1125 |
1500 |
2225 |
3350 |
5575 |
9275 |
-20
to 100 |
285 |
740 |
990 |
1480 |
2220 |
3705 |
6170 |
200 |
260 |
675 |
900 |
1350 |
2025 |
3375 |
5625 |
300 |
230 |
655 |
875 |
1315 |
1970 |
3280 |
5470 |
400 |
200 |
635 |
845 |
1270 |
1900 |
3170 |
5280 |
500 |
170 |
600 |
800 |
1200 |
1795 |
2995 |
4990 |
600 |
140 |
550 |
730 |
1095 |
1640 |
2735 |
4560 |
650 |
125 |
535 |
715 |
1075 |
1610 |
2685 |
4475 |
700 |
110 |
535 |
710 |
1065 |
1600 |
2665 |
4440 |
750 |
95 |
505 |
670 |
1010 |
1510 |
2520 |
4200 |
800 |
80 |
410 |
550 |
825 |
1235 |
2060 |
3430 |
850 |
65 |
270 |
355 |
535 |
805 |
1340 |
2230 |
900 |
50 |
170 |
230 |
345 |
515 |
860 |
1430 |
950 |
35 |
105 |
140 |
205 |
310 |
515 |
860 |
1000 |
20 |
50 |
70 |
105 |
155 |
260 |
430 |
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