It will take you through all aspects related to the role of relief valve in overpressure protection. A Bow-Tie diagram is used to explain the top event and how preventive barrier such as relief valve will try to prevent the safety incident.

Relief load calculation techniques and importance of fluid properties are relieving conditions are explained. Relief valve sizing equations for vapour fluid reliefs are explained. The input parameters for sizing the relief valve along with its use and limitations are explained.

Relief load estimation and relieving property estimation is explained with a case study on liquid vapourisation due to fire. Apply the concepts learnt above to estimate heat absorbed, relieving temperature, relief load and relief valve sizing.

1.0 Introduction

1.1 Introduction to topics covered in sizing of vapour relief valves

2.0 The role of relief valves in overpressure protection

2.1 What is a relief valve and where are they used?

3.0 Relief load and properties at relieving conditions

3.1 Relief load estimation - Using process simulators or manual calculations

3.2 Estimation of fluid properties at relieving conditions

4.0 Relief valve sizing equations

4.1 Relief valve sizing methods - Single phase vapour

5.0 Case Studies - relief load estimation and sizing with practical examples

5.1 Case Study: Fire case - Liquid vapourization (Wetted surface area of Vessel), Constant volume process

5.2 Case Study - Fire case - Gas Expansion (Unwetted surface), Constant volume process