Page 43 - APPLIED PROCESS DESIGN FOR CHEMICAL AND PETROCHEMICAL PLANTS, Volume 1, 3rd Edition

30 Applied Process Design for Chemical and Petrochemical Plants

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Figure 1-27. Centrifugal pumps summary.

Figure 1-28. Centrifugal pump schedule.

A schedule similar to Figure 1-24A is used to summa- interpreting and designing for the needs of the process,
rize insulation process code or class, and pressure test see Figures 1-27, 1-28, 1-29, 1-30.
information to the erection contractor. The process code Two types of schedules are in use:
is the complete code specification (as a separate fluid 1. The summary sheet which summarizes process con-
process service detailed for each fluid) tabulation for the ditions and equipment selection
required piping materials, fittings, valves, gaskets, thread 2. The schedule sheet which summarizes the key refer-
lubricant, etc., for a specific process or utility fluid (see ence data for a particular class of equipment such as
Figures 1-25 and 1-26.) For example, it identifies the type pumps, but contains no process data. The latter type
of gate, globe, plug, check and needle valves to be used in is prepared for job coordination with and in the var-
the fluid by specific catalog figure number of a manufac- ious departments, Le., engineering, construction,
turer or its equivalent. This requires attention to materi- purchasing, production. It primarily serves for the
als of construction, pressure-temperature ratings, and construction period but, of course, does have lasting
connections (flanged, screwed, weld-end) , bonnet type, cross-reference value.
packing, seat type (removable or nonremovable), stem, From a construction viewpoint these summaries are a
and any other details affecting the selection of a valve for necessary check list to aid in keeping the construction
the process fluid conditions. It also contains the specifica- program organized. Individuals who have no real knowl-
tions for pipe, fittings, flanges, unions, couplings, gaskets, edge of the scope of the job, and in particular the process,
thread compound, bolting and any special materials can properly tie the project together in the field by use of
needed to properly complete the piping requirements. these schedules.

Other schedules and summaries include vessels (tanks Information Checklists
and drums), towers or columns, heat exchangers, pumps,
compressors, motors, etc. These are often developed by The process engineer must summarize in some form
the process engineer for organizational uses by the the raw material and utility requirements for use by oth-
process designers as well as by other engineering groups. ers. For example, the civil engineer is interested in waste
Again, these are often cooperatively and sometimes com- water and sanitary sewer flows for proper layout studies.
pletely prepared by a particular specialty group after He is also in need of special requirements for site devel-