Blowdown & Depressurisation API 521 Fire Case Design
Published 9/2026
Created by ProjectEngPro Engineering and Project Management
MP4 | Video: h264, 1920x1080 | Audio: AAC, 44.1 KHz, 2 Ch
Level: All Levels | Genre: eLearning | Language: English | Duration: 20 Lectures ( 4h 6m ) | Size: 2.2 GB
Set a depressurisation rate, check vessel wall temperature and avoid brittle fracture - fire case, orifice sizing
What you'll learn
Determine a depressurisation rate and justify it against API 521 guidance and owner criteria Calculate fire heat input to a vessel using the API 521 equations and wetted surface determination Assess vessel wall temperature response during a fire and predict the time to rupture Evaluate rupture risk by comparing wall stress against temperature-dependent yield strength Identify low temperature embrittlement risk from Joule-Thomson cooling on depressurisation Assess the coldest metal temperature reached and where it occurs in the system Size restriction orifices for the required depressurisation rate including choked flow Select blowdown valves and specify the fail-open actuation the duty requires Calculate the blowdown contribution to flare load and the back pressure it imposes Reassess a legacy blowdown system against current guidance and identify the gapsRequirements
No prior blowdown experience is required - the fire case and cooling mechanisms are built from first principles Any engineering or technical background is enough to follow the course Comfortable with basic algebra - heat input and orifice sizing are worked step by step No software or licence needed to follow the course Helpful but not essential: familiarity with pressure relief or process safetyDescription
This course contains the use of artificial intelligence.
A vessel in a fire has minutes. Depressurise fast enough and the wall stays below the temperature at which it fails. Too slow and it ruptures with the inventory still inside.
Depressurise too fast, though, and the metal cools below its minimum design temperature and fails a different way. The design sits between the two.
In this course you will learn how to find that window and prove you are inside it.
WHAT YOU WILL LEARN TO DO
By the end of this course you will be able to
● Determine a depressurisation rate and justify it against the API 521 guidance
● Calculate fire heat input to a vessel and the resulting wall temperature response
● Assess rupture risk from wall temperature against temperature-dependent yield strength
● Identify low temperature embrittlement risk on depressurisation and design around it
● Size restriction orifices and select blowdown valves for the required rate
● Segment a plant into blowdown sections and calculate the inventory in each
● Assess the blowdown contribution to the flare system and the back pressure it creates
● Reassess an existing blowdown system against current guidance
HOW THE COURSE IS TAUGHT
● Fire heat input and wall temperature worked by hand so the transient makes sense
● The Joule-Thomson cooling calculation done properly rather than assumed away
● No software needed to follow, though the transient analysis tools are explained
● Five section quizzes and a final exam
● Every presentation is included as a downloadable PDF, so you keep the slides as a desk reference after the course
● Built around the assessment that most existing systems have never had
WHAT IS COVERED
● Why depressurisation exists and how it differs from pressure relief
● The depressurisation philosophy - targets, automatic against manual, and segmentation
● Blowdown scenarios and which one sizes the system
● Fire exposure, heat flux and the API 521 heat input equations
● Vessel wall temperature response, wetted and unwetted surface, and the cooling effect of inventory
● Rupture prediction against temperature-dependent yield strength
● Fireproofing and the credit taken for it in the assessment
● Joule-Thomson cooling and auto-refrigeration during blowdown
● Low temperature embrittlement and the brittle fracture risk it creates
● Transient thermal analysis and mitigation by staged or restricted blowdown
● Restriction orifice sizing and blowdown valve selection
● The transient mass and energy balance and how to interpret it
● Interaction with the relief system, flare loading and back pressure
● Initiation philosophy, testing, and the reassessment of legacy systems
WHO THIS IS FOR
● Process and process safety engineers designing or assessing blowdown systems
● Project engineers responsible for depressurisation on capital projects
● Integrity engineers assessing existing systems against current guidance
● Mechanical engineers whose vessels are protected by depressurisation
● Safety case and compliance professionals demonstrating fire case protection
ABOUT YOUR INSTRUCTOR
I am a Chartered Engineer (CEng MIMechE) with over fifteen years in oil and gas, energy and industrial infrastructure, across a range of projects and disciplines.
For more than five years I have also been teaching. Close to twenty thousand engineers have taken my courses, which hold an average rating of 4.26 across the catalogue.
I build these courses because I am genuinely interested in how engineering works and why it fails, and because most technical subjects are taught far worse than they need to be. My aim every time is to produce the course I would have wanted when I first met the subject - practical, honest about what actually matters, and free of the padding that wastes your time.
Requirements
No prior blowdown experience is required - the fire case and cooling mechanisms are built from first principles. Any engineering or technical background is enough to follow it.
START NOW
Enrol today and work through it at your own pace, with every presentation available as a downloadable PDF, lifetime access and every future update included.
Who this course is for
Process and process safety engineers designing or assessing depressurisation systems Project and EPC engineers responsible for blowdown design on capital projects Integrity engineers reassessing existing systems against current guidance Mechanical and vessel engineers whose equipment relies on depressurisation for fire protection Safety case and compliance professionals demonstrating fire case protection adequacy Graduate engineers entering process safety or relief system designHomepage
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