This article is about Low-Temperature Steel ASME B16.5 Flanges and technical specification based on international codes and standards of ASME B16.5.
Low-Temperature Steel ASME B16.5 Flanges (A 350, Grade LF2)
| Scope Description | Low-temperature steel, forged pipe flanges, DN15 to DN600 (NPS 1/2 to NPS 24). |
| Material Specification | ASTM A 350/A 350M. Grade: LF2. Class: 1. |
| Dimensional
Specification | ASME B16.5. Flange facing finish shall conform to ASME B16.5, paragraph 6.4.5 unless otherwise stated in the purchase order. |
| Purchase Order | See purchase order for flange type, DN or NPS, pressure class, flange facing, schedule or weight class or wall thickness, number of pieces, and delivery and shipping instructions. |
| Lengths | Not applicable. |
| Tolerances | ASME B16.5. |
| Drawings | Not required. |
| Calculations | Not required. |
| Chemical Composition | ASTM A 350/A 350M, Grade LF2. Also by ladle analysis the carbon content shall be 0.23% maximum and Supplementary Requirement S6 is required and CE shall be 0.45% maximum. |
| Mechanical Strength | ASTM A 350/A 350M, Grade LF2. The maximum tensile strength shall not be more than 635 N/mm2 (92 ksi). |
| Welding | Not allowed. |
| Heat Treatment | ASTM A 350/A 350M, Grade LF2. All fittings shall be normalized. |
| Inspection | ASTM A 350/A 350M. Company inspection is not required unless specified in the purchase order or required by the certification for this specification. |
| Testing | ASTM A 350/A 350M, Grade LF2, Class 1. |
| Examination | ASTM A 350/A 350M. |
| Certification | Items DN25 (NPS 1) and smaller shall be provided with an EN 10204 Type 3.1 inspection certificate.
Certification for all other items shall be one of the following:
Company ‘ representative may be from any Inspection Body acceptable to Company or alternatively a person nominated by Company . The supplier shall contact Company ‘ Inspection Department to establish who may be Company ‘ representative when applicable. Also see General Piping Material Purchase Specification. |
| Marking | ASME B16.5 (MSS SP-25). Marking shall also include the schedule or weight class or wall thickness and the Commodity Code. Flanges shall be marked by clearly die low stress stamping the outer ring of the flange. Also see General Piping Material Purchase Specification. |
| Protection | Flanges 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 flanges, DN15 to DN600 (NPS 1/2 to NPS 24) to the PED. Pressure: Ratings according to ASME B16.5. Temperature: -29° to +427°C (-20° to +800°F). |
Note: This engineering specification shall be used in conjunction with General Piping Material Purchase Specification.