Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here


Flare Inspection

Flare Inspection

Flare Inspection

Hi members,

The plant I am working consists of a flare and flare has 3 pilots. In-service inspection was carried out with the aid of binocular and flare is burning however I could not notice any flames from pilots. Please suggest is it acceptable and if not what action needs to be taken.

Thanks & regards,
Prathap K

RE: Flare Inspection

If the process logics in the cause and effect matrix indicate that the pilot lines are all left open during normal operation, then see if any one of the following may apply to your case:
a)Pilot may actually be operating with an almost transparent flame ( may actually be blue but looks transparent against a clear sky background).
b) Pilot line pressure may be low and unable to overcome liquid static head in the pilot riser ( pilot gas may be high HC / water dewpoint, resulting in liquid condensation in riser).
If (b) is the case, see if you can drain out the pilot riser at the flare stack base low point drain.

RE: Flare Inspection

Just wait for a dark night with no full moon and look at the Flare Tip through a strong Telescope.
If you see a Glow (around the Tip) then the Pilot is functioning.
No Problem!

Sometimes its possible to do all the right things and still get bad results

RE: Flare Inspection

In a standard flare system design there are thermocouples around pilot burners, if pilots are burning they show temp in the range of 350-450 deg C. If this temp drops below 200 deg C then there is high probability that pilot is not burning.
Try to see in the night from a nearby elevated structure (from top of some column or reactor). It will be much clear when process vent to flare is minimum. Now a days some people use drone cameras for online flare tip inspection. Side by side you may check and confirm fuel gas composition used for pilots and check/clean pilot gas supply line strainer taking bypass in line.

RE: Flare Inspection

Thank you very much for the valuable suggestions. The pilot was functioning properly but was not visible during the day time.

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


White Paper - Effects of AIA Quick Guide to UL 489 or UL 1077
The function of a circuit breaker is to provide overload (thermal) and short-circuit (magnetic) protection to a circuit and its downstream components. A circuit breaker functions like an airbag in a car, protecting circuit components and people by tripping the circuit to interrupt the current flow if it detects a fault condition in the control system. Download Now
White Paper - Guide to Integrate Large-Format Additive
As with any new technology, getting into large-format 3D printing begins with investigation. The first question may be a simple one: what does “large-format” mean? For 3D printers, “large” is a relative term. Many extrusion-based (FFF) 3D printers are referred to as desktop machines, because they fit on table space. Some of these have very respectable build volumes – but when it comes to “large-format,” the machines will need their own dedicated floor space. Large-format 3D printers have significant build volumes and are most often found in professional settings, like manufacturing facilities and R&D centers. Download Now

Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close