tailieunhanh - Liquid Process Piping Episode 8

Tham khảo tài liệu 'liquid process piping episode 8', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Chapter 11 Ancillary Equipment 11-1. Flexible Couplings Flexible couplings are used to join pipe sections to insulate sections from one other to absorb concentrated pipe movement and to join plain end pipe to flanged valves and other equipment. The basic purpose of flexible couplings is to provide flexible but leak-tight connections that will last for the life of the piping. Flexible couplings are generally available in sizes from 15 mm in to m 6 feet and larger. a. Metallic Flexible Couplings The basic configuration of a flexible coupling is a metallic middle ring that slips over the joint between two pipe sections with a gasket and a follower at each end. This configuration compresses the gasket and seals the middle ring see Figure 11-1 . The middle ring can be provided standard in a number of different materials such as plastic or rubber lined stainless steel aluminum Monel carbon steel and ductile iron see Appendix B for the proper material and contact the manufacturers to determine availability . The gaskets are likewise available in different materials typically elastomers and rubber materials . b. Transition Couplings Similar to flexible couplings in construction transition couplings connect pipe with a small difference in outside diameter the middle ring in transition couplings is predeflected to adjust for the differences in diameter. As with the flexible couplings the transitional coupling s middle ring and gaskets are available in different materials depending upon the application. c. Flanged Couplings Flanged couplings are typically provided with a compression end connection on one end and a flange on the other. The flanges can be provided in different ANSI or AWWA standards as required for the application. The manufacturer should be consulted for pressure ratings. EM 1110-1-4008 5 May 99 d. Couplings for Non-metallic Piping Flexible couplings for non-metallic piping are very similar to metallic piping couplings. There are three main configuration .