Don't Add Pressure to Relief Valve Surveys

摘要

MANAGEMENT AT the consulting firm was confident we could do the analysis within budget. After all, 40 hours were allowed for process engineering for each pressure safety valve (PSV). We had a snappy spreadsheet didn't we? It would be easy money.In one project after another, the spreadsheet failed. It was clunky, poorly understood by its users, and based on unsupported assumptions. Ordinary engineers hated it. Time over-runs of 150% were typical.