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ASA Flanges and Hardware

Nor-Cal’s ASA flanges are manufactured from specially treated 304 stainless steel. These flanges mate with standard 150 lb. ASA flanges or 150 ANSI flanges. They are available from stock for standard tube sizes from 2 to 12 inches (50.8 to 304.8mm). Larger sizes are available upon request.

ASA TO ANSI CONVERSION CHART

Nuts and bolts are used to apply pressure between the mating flanges and a seal is effected when a Viton O-ring is compressed. ASA flanges can be baked to 204˚C and have a vacuum range of up to 10-8 mbar. Besides being sold separately, they are available as standards on nipples, adapters, tees, crosses, 
elbows and valves.

Rotatable Flange Option

When components of several systems are used interchangeably, use of rotatable flanges is recommended. Assembly is facilitated by rotation of mating flanges, to align bolt holes. Nonrotatable ASA flanges, unlike rotatable, contain both sealing surface and bolt holes in one unit rather than two. This makes the 
nonrotatable flange less expensive, and therefore the preferred choice when mating component orientation is not a concern. All fittings are priced with nonrotatable flanges. For fittings with rotatable flanges, add the difference between a nonrotatable and rotatable flange of the desired size. Multiply by the number of rotatable flanges required. Be sure to specify the flange numbers which are rotatable.

O-Ring Groove Option

One of each pair of mating ASA flanges requires an O-ring groove. When ordering flanges with grooves indicate this by adding “-G” to the flange model number. An example would be a rotatable ASA-11 flange bored out for six inch (152.4mm) OD tubing with a groove. The model number would be ASA-11-600R-G. The same rule applies when ordering a fitting or adapter flange with only one ASA flange. An example would be adapter flange model number ASA-6-338-200Z-G. When a fitting has more than one ASA flange, such as a four-way cross, indicate which flanges are desired with grooves by using the flange numbers on the drawing. If, for example, you desired a cross with ASA-9 flanges and a six inch (160mm) tube OD with grooved flanges on the left and bottom ports, the model number would be 4C-ASA-9-600-G1-G3. Add the appropriate amount for each O-ring groove to the price of the fitting.