This article is about Steel Special Union Fittings Technical Specification and technical specification based on international codes and standards of ASTM A105.
Steel Special Union Fittings Technical Specification (ASTM A105)
| Scope Description | Carbons steel, forged, socket-weld or threaded end, union pipe fittings for high temperature service. |
| Material Specification | ASTM A 105/A 105M.
Type 316 stainless steel gasket retainer ring with type 304 stainless steel spiral windings and graphite filler material. Manufactured by: Nicholson Steam Trap 150 Coldenham Road Walden, NY 12586-2000 USA Phone: (800) 210-1300, (845) 778-5566 Fax: (845) 778-7123 |
| Dimensional
Specification |
MSS SP-83. Nicholson Uniflex model number SUA-T (threaded) or model number SUA-SW (socket-weld). Threads shall be NPT in accordance with ASME B1.20.1, unless otherwise stated in the purchase order as ISO or BSP. When specified as ISO or BSP, then the threads shall be tapered in accordance with ISO 7/1 or BS 21 (BSP). |
| Purchase Order | See purchase order for type of fitting, DN or NPS, number of pieces, and delivery and shipping instructions. |
| Lengths | Not applicable. |
| Tolerances | MSS SP-83. |
| Drawings | Not required. |
| Calculations | Not required. |
| Chemical Composition | ASTM A 105/A 105M. |
| Mechanical Strength | ASTM A 105/A 105M. |
| Welding | Not applicable. |
| Heat Treatment | ASTM A 105/A 105M. |
| Testing | |
| Inspection | MSS SP-83. Company inspection is not required, unless specified in the purchase order. |
| Examination | MSS SP-83. |
| Certification | Mill certificate. Also see General Piping Material Purchase Specification. |
| Protection | Fittings shall be delivered free from corrosion or oxidation. A protective coating of light oil or varnish corrosion inhibitor may be used. This inhibitor shall be easily removable, and the supplier shall state with his quotation the method for removal. |
| Marking | MSS SP-83. Marking shall also include the heat identification and the Commodity Code. Also see General Piping Material Purchase Specification. |
| Color Coding | Not required. |
| Special Requirements | None. |
| 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. |
Application Notes
Pressure: MSS SP-83 Table 1 and as follows:
115 bar g @ 399°C (1665 psig @ +750°F)
95 bar g @ 427°C (1385 psig @ +800°F) Temperature: -29°C to +427°C (-20°F to +800°F).
Note: This engineering specification shall be used in conjunction with General Piping Material Purchase Specification.