Horizontal Direct Fired Heater Minimum Stack Height Requirements

[Ahmed Elarbagi]

Hello everyone,

I was trying to find if there is a specification or standard that specifies the minimum stack height above the building for a direct fired heater.

The most I found was 2 things:

1- CSA specifying that the minimum requirement is 1.2 * building peak height. However, this is for compressors. Heaters wouldn't be producing as much NOx as compressors, so I'm not sure if the is a different specification for fired heaters.

2- API 560 (Fired Heaters) section 9.2.1.2 specifies that " The minimum height above grade level and the exit gas velocity will be specified by the purchaser.".

Anyone has additional information as to if there is a different requirement for fired heaters than for compressors?

Thank you

 

[shvet]

if there is a different requirement for fired heaters than for compressors?
What? Compressors do not produce NOx. Where a compressor came into being from? What does the compressor have to do with it?

Anyone has additional information
0 meters is ok where proper dispersion is assured

Stack height is subject to emissions dispersion modelling. For cases where such was not provided prior equipment specifying we have been practicing min 15 meters for small heaters and 50 m for large ones.

I personally have met a 120m derreck type vent stack that was severely corroded by exposing to the [invisible] plume from improperly layouted 30m vertical incinerator nearby.

 

[GD2]

I guess OP means compressor means in compressor stations typically run by gas fired turbines.

GDD
Canada

 

[GD2]

OP,
What's the application? Is it for air heaters? Domestic or industrial?
Most residential air heaters chimney height is just above the roof. Most likely, the local building Code will state the requirement.

GDD
Canada