ASA/ANSI Flanges and Fittings
ASA/ANSI Flanges and Fittings
ASA (ANSI) vacuum flanges provide a complete range of fittings to mount with tubing sized from 1 to 12 inches in diameter. The flange system consists of two flanges, a sealing ring, and bolt fasteners to compress the seal between the two flanges. A pair of ASA flanges must have one grooved flange to accept the sealing ring and one smooth face flange onto which the seal will be made. To ease system assembly, rotatable flanges are available for bolt hole alignment.
Types of ASA/ANSI Flanges and Fittings
ASA/ANSI Flanges
ASA/ANSI weld flanges in two designs: fixed and rotatable. Fixed flanges have a set bolt hole orientation whereas rotatable flanges have a two-piece design allowing for bolt hole rotation to assist bolt hole alignment when mating the two flanges. In addition, all ASA/ANSI sealing assemblies must include 1 smooth face ASA/ANSI flange and 1 grooved face flange. Standard ASA/ANSI weld flanges are manufactured from 304L stainless steel. ASA/ANSI weld flanges are manufactured with a weld prep (tube counterbore with step) for immediate installation on your system. ASA/ANSI flange sizes range from 4.25″ to 16.00″. For information concerning a specific size, ASA/ANSI fixed flange with a smooth face, click on the appropriate size above.
ASA/ANSI Crosses
Nipples are manufactured with a flange from the same family on each end of a tube section. Fittings that are manufactured with different flange families on each end are called hybrid adapters. Straight nipples are manufactured with the same size flange on each end of straight section of tubing. Reducer nipples have different size flanges (from the same family) on each end. In addition, reducer nipples are manufactured with straight and conical tube sections. Conical tube sections provide higher conductance. Flexible nipples have tube sections constructed from convoluted (formed metal bellows) tubing. Half nipples are terminated with a tube cuff end on one end for vacuum users with in-house welding capabilities.
ASA/ANSI Elbows
Elbows are manufactured with a flange on each end of a curved section of tubing. ANCORP ASA/ANSI elbows are offered in 3 designs: 45° radius elbow, 90° radius elbow, and 90° mitered elbow to accommodate a wide variety of system configurations and conductance requirements. ANCORP offers flanges on these fittings in two styles: fixed and rotatable. Fixed flanges have a set bolt hole orientation whereas rotatable flanges have a two piece design allowing for bolt hole rotation to assist bolt hole alignment when mating the two flanges.
ASA/ANSI Nipples
ConFlat (CF) nipples are manufactured with CF flanges on each end of a tube section. Fittings that are manufactured with different flange families on each end are called hybrid adapters. Straight nipples are manufactured with the same size flange on each end of a section of straight tubing. Reducer nipples have different size flanges (from the same family) on each end. In addition, reducer nipples are manufactured with straight and conical tube sections. Conical tube sections provide higher conductance. Flexible nipples are manufactured with a section of convoluted tubing. Nipple fittings are available in all CF sizes.
ASA/ANSI Tees
Tees are manufactured with a flange on each end of a “T” shaped section of tubing. The flanges on straight tees are all from the same family. ANCORP offers flanges on these fittings in two styles: fixed and rotatable. Fixed flanges have a set bolt hole orientation whereas rotatable flanges have a two piece design allowing for bolt hole rotation to assist bolt hole alignment when mating the two flanges.
ASA/ANSI Hardware and Seals
The ASA/ANSI elastomer sealed flange system uses bolt kits to fasten two flanges and Fluorocarbon (FKM) elastomer o-rings to create a seal. In addition to the standard fasteners and seals, adaptive bushings are available to reduce ASA/ANSI bolt holes from 3/4″ to 3/8″. Adaptive bushings are commonly used to connect an ASA/ANSI flange (sizes 200, 300, or 400) to a gate valve with a matching flange
