This document provides a 3-step process for tuning a fired heater: 1. Check the flame pattern and firebox, clean the burner if needed, and ensure the flame is stable. 2. Measure the arch draft and adjust the stack damper to achieve the proper draft of 0.1 inches water column. 3. Measure excess oxygen levels, adjust burner air registers to achieve excess O2 of 3%, and ensure stable flame and proper draft.

1. Fired Heater Tuning
Step 1: Check Flames/Firebox
Open All Peepholes Increase Airflow
Shutdown Burner; Clean
Burner; Light up
Recheck Flame Pattern/
Impingement
Good Flame
Check Arch Draft
(See Step-2)
Check Excess O2
(See Step-3)
Close All Peepholes
Is
Flame
OK?
Check Flame
Pattern/Impingement
Bad
Flames ?
Hazy
Firebox?
NO
YES
YES
NO

2. Fired Heater Tuning
Step 2- Arch Draft
Read Draft At Arch
Close Stack
Damper
Open Stack
Damper
Check Flame Characteristic
(See Step-1)
Check Excess O2
(See Step-3)
Is
Draft
OK ?
LOW YES
HIGH
Arch Draft=
0.1” WC

3. Fired Heater Tuning
Step 3- Excess O2
Read Excess O2
Close Burner
Air Registers
Open Burner
Air Registers
Check Flame Characteristic
(See Step-1)
Check Arch Draft
(See Step-2)
Is
Excess
O2 OK
LOW YES
HIGH
Excess O2= 3%