Flanges

PM is the US agent for Hans van Triel flanges. Read more <here>.

Flanges in Duplex - UNS S31803 & S32205
Flanges in Super Duplex - UNS S32750 & S32760
Flanges in 6 Moly - UNS S31254, N08925 & N08926
Flanges in Copper Nickel UNS C70600 C70620 C7060X C7150 C71520 C71640

<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