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the fabrication shall be agreed on by the Purchaser and Vendor prior to fabrication. b) Pressure-containing welds, including welds of the cylinder to axial-joint and radial-joint flanges, shall be full- penetration welds. c) Where asme a17.1 dimensional stability of the component must be assured for the integrity of pump operation, post-weld heat treatment shall be performed regardless of thickness.
6.11.6.4 Connections welded to cylinders shall be installed as follows. a) Attachment of suction and discharge nozzles shall be by means of full-fusion, full-penetration welds. Weld neck flanges shall be used for pumps handling flammable or hazardous liquids. Welding of dissimilar metals shall not be performed. b) If specified, proposed connection designs shall be submitted for approval before fabrication. The drawings shall show weld designs, size, materials, google.com and pre and post-weld heat treatments. c) Post-weld heat treatment, if required, shall be carried out after all welds, including piping welds, have been completed. d) Unless otherwise specified, auxiliary piping welded to alloy steel cylinders shall be of a material with the same nominal properties as the cylinder material. 6.11.7 Low Temperature Service 6.11.7.1 The Purchaser shall specify the minimum design metal temperature the pump will be subjected to in service.
This temperature shall be used to establish impact test requirements. Normally, this will be the lower of the minimum surrounding ambient temperature or minimum fluid pumping temperature; however, the Purchaser may specify a minimum design metal temperature based on properties of the pumped fluid, such as auto-refrigeration at reduced pressures. 6.11.7.2 To avoid brittle failures, materials and construction for low temperature service shall be suitable for the minimum design metal temperature in accordance with the codes and other requirements specified. The Purchaser and the Vendor shall agree on any special precautions necessary with regard to conditions that may occur during operation, maintenance, transportation, erection, commissioning, and testing. NOTE Good design practice should be followed in the
