FLANGES
A flange joins two pieces of pipe or connect up valves in a piping system. It may be cast, forged, or a ring of steel cut from plate.
| Sizes: 1/2”-60” | |
| Classes: 150#, 300#, 400#, 600#, 900#,1500#, 2500# | |
| MATERIALS — | Available in: |
| Carbon Steel — ASTM A-105 | |
| Stainless Steel — ASTM A-182 | |
| and various Alloys | |
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SLIP ON
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Preferred for their virtual low cost, reduced accuracy required in cutting pipe to length, and somewhat greater ease of alignment of the assembly. |
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WELDING NECK
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Preferred for severe service condition. The tapered hub provides an important reinforcement of the flange. |
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THREADED
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Chief merit lies in that it can be assembled with no welding. Usually limited to piping systems 2 inch and under. Used for low pressure systems. |
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LAP JOINT
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Chief use is in services requiring frequent dismantling for inspection and cleaning. Used in conjunction with stub ends. |
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BLIND
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Used to dead end a flanged system. |
ORIFICE FLANGES
| Orifice flanges, for metering liquids and gases, are made in pressure classes 300 through 2500 lb.; in carbon steel, stainless steel and alloy materials; and raised face or ring joint. |
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| NOTES FOR ORIFICE FLANGES: | |
| Welding neck and slip-on ORIFICE FLANGES class 300 only from ANSI B16.36 are shown for illustrative purposes. Other types and pressure classes are available and sizes larger than 24” will conform to MSS SP-44. |
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| Tolerances and ratings follow ANSI B16.5 except for the following: | |
| 1. Tolerance for the tap-hole-to-face dimensions | |
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| 2. Tolerance for welding neck flange bores | |
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DUCTILE IRON BACK-UP FLANGES
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| FOR USE WITH TYPE “C” STUB ENDS | |
| DUCTILE IRON | |
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