Domain Ontology and Requirements specification

Overview

Goals

Read the case given below and do the following: 1. Draw Domain Ontology (separately mention concepts, relations, and Axioms) 2. Write two boiler plate Reqs 3. Mention requirements suggestions based on ontology (if any)

Learning Objectives

to be able to 1. Draw Domain Ontology (separately mention concepts, relations, and Axioms) 2. Write reqs in boiler plate format 3. Mention new requirements suggestions based on ontology (if any)

Context

Consider the process on an offshore gas production installation. Gas from the various wells is collected in a wellhead manifold and led into two identical process trains. The gas from the process trains is then collected in a compressor manifold and led to the gas pipeline via compressors. On the inlet pipeline, there are installed two process shutdown (PSD) valves, PSD1 and PSD2 in series. The valves are fail-safe close and are held open by hydraulic pressure. When activated, the pressure sensors will provide signal to PLC to close the both process shutdown valves PSD1 and PSD2. The PLC employs a 1-out-of-2 voting logic. This means that the logical unit sends a signal to close the two valves, PSD1 and PSD2, if at least one of the sensors detect that the maximum pressure in the separator was exceeded. A pressure safety valve PSV is installed to relieve the pressure in the tank in case the pressure increases beyond a specified pressure p.