Relief and Flare System Design Workshop
Sizing for the case that governs, including the reactive one nobody sized for
Relief sizing is taught as a code exercise and fails as a scenario selection problem. This workshop covers the full case set from fire through to blocked outlet and runaway reaction, the two phase flow methods that a reactive case demands, and the flare header hydraulics that decide whether the device can actually relieve.
This course sits alongside our Relief System Design consulting work, so what is taught is what we do.
Who should attend
Course content
Every module is taught with worked examples and exercises drawn from real plant, and adapted to your own process where the course runs in house.
Scenario selection
- The full credible case set and the discipline of not stopping at fire
- Blocked outlet, control valve failure, tube rupture, thermal expansion and utility failure
- Runaway reaction and external fire on a reacting system
- Linking relief case selection to HAZOP output so nothing is missed
Single phase sizing
- Vapour, liquid and steam sizing from the code equations
- Fire case heat input, wetted area and environmental factors
- Back pressure, built up and superimposed, and its effect on device selection
- Conventional, balanced bellows and pilot operated device selection
Two phase and reactive relief
- Why a reactive system cannot be sized as though it were vapour only
- DIERS methodology and system type classification into vapour, gassy and hybrid
- Leung's method and the omega approach
- Calorimetry data requirements and the thermal inertia correction
Disposal and headers
- Flare header hydraulics and the effect of simultaneous relief
- Knockout drum sizing and liquid carryover
- Flare radiation and dispersion of the relieved stream
- Effluent handling where the relieved material cannot go to flare
Documentation and review
- A relief study record that another engineer can check
- Recognising a device that was sized for the wrong case
- Revalidation triggers under management of change
What you receive
- Relief case selection and sizing worksheets
- Worked single phase and two phase calculations
- A relief study review checklist
- Assessment result and attendance record
What changes afterwards
- Reactive scenarios get sized rather than assumed covered by the fire case
- Devices are selected against the back pressure they will actually see
- Existing installations get assessed honestly against current methodology
- Relief studies come back from contractors in a reviewable form
Standards and references
We teach Relief and Flare System Design Workshop against API 520 parts 1 and 2 for sizing, selection and installation and the codes listed with it, at the edition current when you run it.
Run Relief and Flare System Design Workshop for your team
We will come back with dates, the pre-reading it needs and a cost per head. Tell us who is attending, what they already do day to day and whether you want it at your site or delivered online.
Ask about dates and cost