Pressure Relief

Location Edinburgh, UK

Date 22nd November 2022

Duration 3 days

Topic Process Plant

CPD Hours 17.75

Price IChemE member £1890 + VAT, non-member £1990 + VAT

This is an IChemE approved training course and not delivered directly by the Institution. For more information about the course, contact the training provider directly.


This course has been designed specifically to enhance the skills needed for sound pressure relief design. With ABB’s extensive experience of pressure relief system design and operation, providing a practical perspective based on real life experience comes naturally.

Pressure relief can be caused by a number of events including fire, reaction runaway, thermal expansion and process abnormality. Incorrect design of pressure relief systems continues to result in major safety and environmental incidents with resultant business consequences. Incidents can occur as a result of failure to provide relief, inadequate relief capacity, disposal system failure or incorrect design and installation.

A structured approach to pressure relief design is vital to ensure protection of plant from excessive over and under pressure. This course is based on ABB’s extensive experience of design installation and maintenance of relief systems, and covers a state-of-the-art methodology, based on a life cycle approach to pressure relief.

Learning outcomes

  • Improve your company's overall business safety and environmental performance
  • Get pressure relief design right first time and avoid costly mistakes
  • Discover the potential cost effective alternatives to pressure relief
  • Master a structured approach to pressure relief

Course outline

Day 1

  • What is pressure relief and why use it?
  • Approach to pressure relief design
  • Pressure relief and the design process
  • Pressure relief design team/responsibilities (inc. syndicate task)
  • Inherent safety and alternatives to pressure relief
  • Identification of relief events
  • Identification of events leading to excessive pressure and vacuum
  • Syndicate task: identification of relief events
  • Syndicate task: review
  • Calculating the required relief rate
  • External fire
  • Fluid flow from high pressure source
  • Heat and energy input from associated equipment
  • Pumps and compressors
  • Ambient heat transfer
  • Liquid expansion in pipe
  • Syndicate task: calculation of required relief rate
  • Syndicate task: review
  • Discharge and disposal
  • SHE and discharge and disposal system design

Day 2

  • Relief device hardware
  • Anatomy of a safety valve
  • Bursting disc hardware
  • Devices for special applications
  • Selection and types of relief devices
  • Syndicate task: selection of relief device
  • Syndicate task: review
  • Relief system sizing
  • Safety valve sizing
  • Syndicate task: safety valve sizing
  • Syndicate task: review
  • Design criteria for relief systems
  • Computer software and pressure relief
  • Installation, inspection and operation
  • Relief system documentation
  • Installation of pressure relief devices - piping, isolation, drains, etc
  • Relief systems inspection and maintenance
  • Common pitfalls
  • Common pitfalls in pressure relief design
  • Explosion relief overview
  • Explosion relief and how it differs from pressure relief

Day 3

  • Pressure relief codes and legislation
  • Pressure relief codes and legislation
  • Chemical reaction hazards
  • Chemical reaction hazards
  • Syndicate task: chemical reaction hazards
  • Syndicate task: review
  • Two phase flow
  • Two phase flow design principles
  • Two phase flow and the DIERS method
  • Syndicate task: two phase flow, DIERS
  • Syndicate task: review
  • Low pressure tanks
  • Venting of low pressure tanks
  • Syndicate task: low pressure tanks
  • Syndicate task: review
  • Low pressure tank relief devices

Who will benefit

Plant, production and safety managers, process and chemical engineers, piping and project, mechanical and control engineers and regulators, safety and environment specialists.

Contact Phone +44 (0)1642 372029

Contact Email

Learn more
Chris Flower


Chris Flower

ABB Consulting

Chris is the Process Engineering Manager for ABB Consulting with over 20 years of process engineering experience.

Throughout his career Chris has been involved in pressure relief be it, designing new systems, reviewing existing systems or validating systems designed by others across the whole range of process industry sectors.

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