Читать книгу Petroleum Refining Design and Applications Handbook - A. Kayode Coker - Страница 53

Utility line diagram (ULD) includes hardware details of the steam, water piping and control systems (Figures 14.11 and 14.12). Used to summarize and detail the interrelationship of utilities such as air, water (various types), steam (various types), heat transfer mediums such as Dowtherm, process vents and purges, safety relief blow-down, etc., to the basic process. The amount of detail is often too great to combine on other sheets, so separate sheets are prepared. These are quite valuable and time saving during the engineering of the project. They also identify the exact flow direction and sequence of tie-in relationships for the operating and maintenance personnel. The distribution of a utility such as steam is by a common distribution pipe, with each unit requiring the utility drawing its supply from that pipe. When a unit has taken its requirement, the utility distribution pipe can then be reduced in size as it continues to the next unit requiring the utility. The order of servicing units is affected by layout, and utility line sizes are affected by the order.

Figure 14.9 Piping details isometric diagram [9].

Figure 14.10 Isometric diagram of a process line [9].

Figure 14.11 Standard type laying for service piping diagram.

Figure 14.12 Process Engineering flow scheme (Crude distiller unit 1000 air cooler manifold) [9].