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3.3 Inlets，Outlets and Other Connections
3.3.1 The inlets，outlets and other connections of rotary machines shall be flanged，and the flange standards and pressure rating shall be specified in the inquiries or datasheets.
3.3.2 The connections within the rotary machines may use other flange standards beyond those specified in the inquiries or datasheets，the applicable standards and nominal pressure ratings for flanges may follow Appendix A of this code.