1.1 This specification covers wrought stainless steel fittings for pressure piping applications.2
1.2 Several grades of austenitic stainless steel alloys are included in this specification Grades are designated with a prefix, WP or CR, based on the applicable ASME or MSS dimensional and rating standards, respectively.
1.3 For each of the WP stainless grades, several classes of fittings are covered, to indicate whether seamless or welded construction was utilized. Class designations are also utilized to indicate the nondestructive test method and extent of nondestructive examination (NDE). Table 1 is a general summary of the fitting classes applicable to all WP grades of stainless steel covered by this specification. There are no classes for the CR grades. Specific requirements are covered elsewhere.
| 8199;Class | 8199;8199;Construction | 8199;Nondestructive Examination |
| 8199;S | 8199;8199;Seamless | 8199;None |
| 8199;W | 8199;8199;Welded | 8199;Radiography or Ultrasonic |
| 8199;WX | 8199;8199;Welded | 8199;Radiography |
| 8199;WU |