Ref No: PE036
Title: Relief & Flare System
Start Date: 12 September2021 End Date: 16 September 2021
Venue: Dubai, UAE
Training will be held at any of the 5 star hotels. The exact venue will be informed once finalized.
Pressure-relief systems control vapors and liquids that are released by pressure-relieving devices and blow-downs. Pressure relief is an automatic, planned release when operating pressure reaches a predetermined level. Blowdown normally refers to the intentional release of material, such as blowdowns from process unit startups, furnace blowdowns, shutdowns, and emergencies. Vapor depressuring is the rapid removal of vapors from pressure vessels in case of fire. This may be accomplished by the use of a rupture disc, usually set at a higher pressure than the relief valve.
Safety Relief Valve Operations
Safety relief valves, used for air, steam, and gas as well as for vapor and liquid, allow the valve to open in proportion to the increase in pressure over the normal operating pressure. Safety valves designed primarily to release high volumes of steam usually pop open to full capacity. The overpressure needed to open liquid-relief valves where large-volume discharge is not required increases as the valve lifts due to increased spring resistance. Pilot-operated safety relief valves, with up to six times the capacity of normal relief valves, are used where tighter sealing and larger volume discharges are required. Nonvolatile liquids are usually pumped to oil-water separation and recovery systems, and volatile liquids are sent to units operating at a lower pressure.
A typical closed pressure release and flare system includes relief valves and lines from process units for collection of discharges, knockout drums to separate vapors and liquids, seals, and/or purge gas for flashback protection, and a flare and igniter system which combusts vapors when discharging directly to the atmosphere is not permitted. Steam may be injected into the flare tip to reduce visible smoke.
Liquids should not be discharged directly to a vapor disposal system. Flare knockout drums and flares need to be large enough to handle emergency blowdowns. Drums should be provided with relief in the event of over pressure. Pressure relief valves must be provided where the potential exists for overpressure in refinery processes due to the following causes: Loss of cooling water, which may greatly reduce pressure in condensers and increase the pressure in the process unit. Loss of reflux volume, which may cause a pressure drop in condensers and a pressure rise in distillation towers because the quantity of reflux affects the volume of vapors leaving the distillation tower. Rapid vaporization and pressure increase from injection of a lower boiling-point liquid including water into a process vessel operating at higher temperatures. Expansion of vapor and resultant over-pressure due to overheated process steam, malfunctioning heaters, or fire. Failure of automatic controls, closed outlets, heat exchanger failure, etc. Internal explosion, chemical reaction, thermal expansion, or accumulated gases. Maintenance is important because valves are required to function properly. The most common operating problems are listed below.
Liquid knockout facilities are examined and appropriate system requirements identified to prevent liquid carryover to the flare. Liquid disposal methods and the appropriate target levels for maximum carryover drop size are presented. The effects of liquid carryover on various flare types are considered.
Seal pot systems, often used in flare staging, are considered and alternative methods of providing and disposing of the seal water are compared. The uses and advantages of seal pots are reviewed.
Systems for flare gas recovery are examined and types of compressor are compared. The need for elevated flare stack purging is considered and alternative approaches using fuel and inert gases are compared. The economics and recommended sizing of the flare gas recovery system are studied via an extended group exercise.
At each stage of the course, recommendations regarding essential maintenance and repair of the components of the flare system will be developed. Throughout the course the relevant contents of established specifications for flare systems, such as API 520 and API 521, will be developed and related to the balance of the course content.
Upon the successful completion of this course, each participant will be able to:-
Function of a Flare System
What do we get out of the flare?
Types of Flare
Elevated Flare Types
Seal Pot Systems
Flare System Maintenance
Flare Gas Recovery
Pre & Post Tests will be conducted
Case Studies, Group Exercises, Group Discussions, Last Day Review & Assessments will be carried out.
Define Management Consultancy & Training Certificate of course completion will be issued to all attendees.
A highly interactive combination of lectures and discussion sessions will be managed to maximize the amount and quality of information and knowledge transfer. The sessions will start by raising the most relevant questions, and motivate everybody find the right answers. You will also be encouraged to raise your own questions and to share in the development of the right answers using your own analysis and experiences. Tests of multiple-choice type will be made available on daily basis to examine the effectiveness of delivering the course.
Very useful Course Materials will be given.
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