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This is used to present the heat balance and material balances of a process (Figures 14.6a–14.6c). This may be in broad block form with specific key points delineated, or in more detailed form identifying essentially every flow, temperature and pressure for each basic piece of process equipment or processing step. This may and usually does include auxiliary services to the process, such as steam, water, air, fuel gas, refrigeration, circulating oil, and so on. This type of sheet is not necessarily distributed to the same groups as would receive and need the piping flowsheet described next, because it may contain detailed confidential process data.

Figure 14.5 Block flow diagram of hydrocracker overview.

Figure 14.6a Heat and material balance-established material and thermal requirements [9].