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>

Slip-On Flanges
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.		   Slip-On Flange
     
Blind Flanges
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.		   Blind Flange
     
Weld-Neck Flanges
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.		   Weld-Neck Flange
     

Threaded Flanges
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.

   Threaded Flange
     

Socket Weld Flanges
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.

   Socket Weld Flange
     

Lap-Joint Flanges
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.

  Lap-Joint Flange
     
Orifice Flanges
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.		  
     
Spectacle Blank
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.		   Spectable Blank
     

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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