Piping design procedure

By employing accurate test-design procedures (Pan and Wypych, 1992a), it is possible to model and design each pipe branch separately so that the system ultimately is well balanced. However, such a system may not be reliable over time due to uneven wear in the pipes/bends, changes in material property and/or on-site conditions. 

Good flow splitting design is dependent on the accurate prediction of the pressure drop caused by the various bends, branches and straight sections of pipe. This can be achieved by employing the above branch model(s), proven for the particular material and application, coupled with the accurate pipeline test-design procedure described in Sec. 2.4 of this chapter. 

The same authors presented data on pressure drop at abrupt contractions for which their method of correlation has a rational basis. In this work both the fluid used and the pipe diameter were changed simultaneously hence the reasons for the absence of any correlation in this case cannot be specified. Their general method of approach appears to be a powerful and useful basis for further work but has not yet led to a recommended design procedure. 

Authorities responsible for national pressure vessel and piping codes recommend detailed design procedures. Furthermore a short introduction to national regulations is given. 

Most SRV vendors will refuse any liability when it comes to noise caused by complete installations, as they do not in any shape or form control the selection or installation of such material, nor do they control the work procedures and piping designs. 

The usual design procedure is to couple a specific value of design stress with a conventional stress or strain analysis of the assumed structural idealisation. The uniaxial deformation behaviour is of special importance in thin-walled pipes, circular tanks and comparable systems under simple stress. 

Consider Figure 5 again. Bleeder steam line B5 extracts 55351 lbm/hr (6.974 kg/s) at 93.8 psia (0.65 MPa) and 603 F (317 C) from the intermediate-pressure turbine delivering it to a feedwater heater. Steam line B5 was chosen to illustrate the design procedure for two reasons. First, the design has sufficient flexibility there are no extraordinary constraints on the pipe material and size, or on insulation thickness. Secondly, the available energy analysis and unit-cost computations for this power plant, and for steam line B5, have been presented in previous papers (5, 6 ) ... 

Piping Flow Sheets. All the process and utility piping is shown on engineering flow sheets. A typical type of engineering flow sheet is drawn in Fig. 3-9. Lines are coded according to a system which makes piping design identification and procedures easy to follow. The code system shown in Fig. 3-9 is ... 

In the previous chapters, we have mainly discussed work that falls within the responsibility of the process, mechanical, and piping engineers. Before proceeding to a review of the more detailed design procedures which follow on from overall layout development, we will address some of the major responsibilities and concerns of the other engineering disciplines. In particular, we will address some of the issues concerning the overall discipline interfaces, information flow, and planning of work. 

---