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
SLIP ON
257a
Preferred for their virtual low cost, reduced accuracy required in cutting pipe to length, and somewhat greater ease of alignment of the assembly.
WELDING NECK
257b
Preferred for severe service condition. The tapered hub provides an important reinforcement of the flange.
THREADED
257c
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.
LAP JOINT
257d
Chief use is in services requiring frequent dismantling for inspection and cleaning. Used in conjunction with stub ends.
BLIND
257e
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.
258a
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.
258b
Tolerances and ratings follow ANSI B16.5 except for the following:
1. Tolerance for the tap-hole-to-face dimensions
  • ±0.02” for flanges < 4” nominal size
  • ±0.03” for flanges greater than or equal to 4” nominal size
2. Tolerance for welding neck flange bores
  • ±0.5% of nominal size
DUCTILE IRON BACK-UP FLANGES 

FOR USE WITH TYPE “C” STUB ENDS
DUCTILE IRON
  • Dimensions are given in inches.
  • Prime Painted or Hot Dipped Galvanized.
  • O.D. and drilling are 150# class.
  • Sizes larger than 36” available on request.
  • Stainless Steel available on request.
258c