This article is about Low-Temperature Steel, Special, Set-on Branch Fittings and technical specification based on international codes and standards of ASTM A350/A 350M, Grade LF2, Class 1.
Low-Temperature Steel, Special, Set-on Branch Fittings ASTM A350
| Scope Description | Low-temperature steel, forged, set-on branch pipe fittings to the supplier’s standard dimensions. (Integrally Reinforced Forged Branch Outlet Fittings – Socket Welding, Threaded, and Butt-Welding Ends, e.g., weldolets, sockolets, thredolets, and elbolets.)
Note: These fittings are outside of the range of MSS SP-97. |
| Material Specification | ASTM A350/A 350M, Grade LF2, Class 1 |
| Dimensional Specification | Supplier’s standard. 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, fitting pressure class, schedule or weight class or wall thickness of branch, number of pieces, and delivery and shipping instructions. |
| Lengths | Not applicable. |
| Tolerances | Supplier’s standard. |
| Drawings | Required with supplier’s quotation. |
| Calculations | Set-on branch fittings to this specification shall meet the design proof or calculation requirements of ASME B31.3. Submission of calculations is not required. |
| Chemical Composition | ASTM A350/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 A350/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 A350/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 | ASTM A350/A 350M, Grade LF2. |
| Testing | ASTM A350/A 350M, Grade LF2. |
| Examination | ASTM A350/A 350M, Grade LF2. |
| 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-25. 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 | Fittings should always be selected based on the run pipe schedule, not the branch schedule. Where a non-standard schedule is specified, the next highest schedule specified in MSS SP-97 should be selected and the fitting prepped to suit. |