Step 3 SIS Safety Requirements Specifications

Safety lifecycle phase or activity Objectives Requirements Clause or Subclause of ISA-84.01-2004 Inputs Outputs 

The information in this example SRS may be contained in a single document format. It may also be contained in a combination of documents. The following requirements are for this example only. 

The information in Table 8, SIFs and associated SILs, were the outputs of step 2 and were used in the development of the SRS. 

The BPCS performs operational functions for an orderly start-up and normal shutdown. These are not included in this example. 

The PHA team has identified plugging as a potential problem in this application. The design team should take this concern into account when it designs the SIS. 

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