This article is about Stainless Steel Special Union Fittings (Grade 316/316L) and technical specification based on international codes and standards of ASTM A 182/A 182M.
Stainless Steel Special Union Fittings (Grade 316/316L) | ASTM A182
| Scope Description | Stainless steel, forged, socket-weld or threaded end union pipe fittings for cryogenic service. |
| Material Specification | ASTM A 182/A 182M. Grade: F316L.
Metal-to-metal seat with virgin PTFE seal ring. Manufactured by: Hart Industries International Inc., or PO Box 30400 Tucson Arizona 85751-0400 USA or SSP Fittings Corp. 8250 Boyle Parkway Twinsburg Ohio 44087 USA or Rio Stainless Engineering Ltd. Unit 1 Neptune Industrial Estate Owen Road Willenhall West Midlands England WV13 2PZ. |
| Dimensional Specification | Supplier’s standard.
Hart Industries Figure Number 3333 (socket-weld) or 3131 (threaded). SSP Fittings Figure Number KUS-3000 (socket-weld) or KUT-3000 (threaded). Threads shall be NPT female in accordance with ASME B1.20.1, unless otherwise stated in the purchase order. |
| Purchase Order | See purchase order for type of fitting, end connections, seal ring material, DN
or NPS, number of pieces, and delivery and shipping instructions. |
| Lengths | Not applicable. |
| Tolerances | Supplier’s standard. |
| Drawings | Not required. |
| Calculations | Not required. |
| Chemical Composition | ASTM A 182/A 182M, Grade F316L. |
| Mechanical Strength | ASTM A 182/A 182M, Grade F316.
Grade F316L material shall be supplied that has been selected to have the mechanical properties of Grade F316. |
| Welding | Not applicable. |
| Heat Treatment | ASTM A 182/A 182M, Grade F316L. |
| Inspection | ASTM A 182/A 182M. Inspection is not required, unless specified in the purchase order. |
| Examination | ASTM A 182/A 182M. |
| Testing | ASTM A 182/A 182M. |
| Certification | Mill certificate or, in Europe only, inspection certificate Type 3.1 to EN 10204. Also see 4WPI-M00001. Dual 316L/316 certified. |
| Marking | MSS SP-83. Marking shall also include the heat identification and the Commodity Code. Also see 4WPI-M00001. |
| Protection | ASTM A 182/A 182M. |
| Packing | Shipment and Packing Specification for Equipment and Materials. Suitable packing shall be provided to ensure that all items arrive at the contractual point of delivery in an undamaged condition. Refer to the purchase order for specific packing standards and instructions. |
| Color Coding | Not required. |
| Special Requirements | Items shall be pickled and passivated to remove rust contamination. |
Application Notes
Stainless steel, special cryogenic union fittings, DN8 to DN50 (NPS 1/4 to NPS 2).
Pressure: 206 bar g (3000 psig).
Temperature: -196° to +230°C (-320° to +450°F).