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Chemical Process Technology

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Wednesday, February 25, 2009

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Pressure relief to protect system from overpressure and emergency depressuring to evacuate system inventory to safe location are common plant safety system. Fluid is discharge in the proper designed collection system will then be send to flare for proper combustion. Different fluid characteristics, pressure available in the collection header, carbon-hydrogen ratio, concentration of toxic component, local requirement, etc will require different type of flare tip for proper flaring.

There are several typical flare type :
  • Pipe flare (subsonic)
  • Sonic flare (single tip & multiple tips)
  • Coanda tip (single & multiple)
  • Steam assisted flare tip
  • Air assisted flare tip
  • Enclosed flare
  • Endothermic flare
  • Liquid burner
  • Other proprietary tip
A process / package engineer will prepare flare tip datasheet and flare tip vendor will base on the provided information and requirement to select a proper tip. It is sometime interesting to know what type of flare tip will typically be selected by vendor. This is to ease preliminary design and plant layout consideration.

A simple flare selection chart has been provided to ease process engineer in flare tip type selection.
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posted by Webworm, 11:08 AM


Anonymous farhad said...

please put all these information in pdf file to simple download and use your information.
these can help me in my project in university.

May 19, 2009 at 2:48 AM  
Blogger praveen said...

Hi friends,
I m praveen kumar as a Piping Er in India.
I want need Flare Piping Routing once line has be
downward position then upward is accepted or not.
just clarify.
mail me

August 24, 2009 at 10:14 PM  
Blogger Webworm said...

Flare header is commonly slope to Flare KOD drum, which used to collect liquid and recover back to process system (or evacuate to liquid burner). Flare piping slope downward and upward again may results all problems i.e. liquid accumulation, corrosion, slugging, vibration, etc. It is always NOT recommended.

August 25, 2009 at 8:01 AM  
Blogger Webworm said...

Recommend you to read this post.

Why not bury flare pipe header ?

August 25, 2009 at 8:09 AM  
Blogger alpha.pei said...

Dear all,
I'm looking find Sonic Vent Tip, please advice supplier.
Kindly inform to email "alpha.pei.group@gmail.com"

October 14, 2009 at 9:58 PM  
Blogger Webworm said...

Aplha Pei,

Most flare tip vendors supply Sonic flare tip. There are

John Zink
Flare Industries

However, i have not heard of sonic vent tip.

December 27, 2009 at 10:53 AM  
Anonymous Anonymous said...

what is the pressure drop for coanda sonic flare tip self ignited for 10 mmscfd capacity?

October 5, 2010 at 2:15 AM  
Anonymous JoeWong said...

Typically pressure drop can be few bar (3-7 bar) for sonic tip. Please confirm with John Zink.

October 5, 2010 at 7:04 AM  

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