This article is about Low-Temperature Steel MSS SP-83 Union Fittings and technical specification based on international codes and standards of ASTM A 350.
Low-Temperature Steel MSS SP-83 Union Fittings | ASTM A 350
| Scope Description | Low-temperature steel, forged, socket-weld or threaded end, union pipe fittings. |
| Material Specification | ASTM A 350/A 350M, Grade LF2, Class 1 |
| Dimensional
Specification |
MSS SP-83.
Threads shall be NPT in accordance with ASME B1.20.1, unless otherwise stated on the purchase order as ISO or BSP. When specified as ISO or BSP, 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, pressure class, 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 350/A 350M, Grade LF2.
(Additional requirements when purchase order originates from or is for delivery to Europe, or when mandated by the purchase order. Also by ladle analysis the carbon content shall be 0.23% maximum and Supplementary Requirement S4 is required and CE shall be 0.45% maximum.) |
| Mechanical Strength | ASTM A 350/A 350M, Grade LF2.
[Additional requirements when purchase order originates from or is for delivery to Europe, or when mandated by the purchase order. The maximum tensile strength shall not be more than 635 N/mm2 (92 ksi).] |
| Welding | Not applicable. |
| Heat Treatment | ASTM A 350/A 350M, Grade LF2.
(Additional requirements when purchase order originates from or is for delivery to Europe, or when mandated by the purchase order. All fittings shall be normalized.) |
| Inspection | MSS SP-83. Company inspection is not required, unless specified in the purchase order. |
| Testing | MSS SP-83. |
| Examination | MSS SP-83. |
| Certification | Mill certificate or, in Europe only, inspection certificate Type 3.1 to EN 10204. Also see General Piping Material Purchase Specification. |
| Marking | MSS SP-83.
Marking shall also include the heat identification and the Commodity Code. 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. |
| Color Coding | Not required. |
| 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. |
| Special Requirements | None. |
Application Notes
Low-temperature steel, union fittings. Pressure: MSS SP-83, Table 1.
Temperature: -46° to +371°C (-50° to +700°F).
Note: This engineering specification shall be used in conjunction with General Piping Material Purchase Specification.