API RP 581 - 3rd Ed.2016 - Add.2-2020 - Risk-Based Inspection Methodology

2.B-62 API RECOMMENDED PRACTICE 581
2.B.8.5 Tables
Table 2.B.8.1—Amine Corrosion—Basic Data Required for Analysis
Basic Data
Material of construction (CS or SS)
Amine concentration (wt%)
Maximum process temperature (°C :°F)
Acid gas loading
(mole acid gas/mole active amine)
Velocity (m/s:ft/s)
HSAS concentration:
MEA and DEA
(≤2 wt%, 2 to 4 wt%, > 4 wt%)
MDEA
(<500, 500 to 4000, >4000 wppm)
Comments
Determine the material of construction of equipment/piping.
Determine the amine concentration in the equipment/piping. Due to vaporization
of water, a local increase in amine concentration may need to be considered in
evaluating the corrosion of some reboilers and reclaimers.
Determine the maximum process temperature. In reboilers and reclaimers, tube
metal temperatures may be higher than the bulk process temperature.
Determine the acid gas loading in the amine. If analytical results are not
available, it should be estimated by a knowledgeable process engineer.
Determine the maximum velocity of the amine in this equipment/piping.
In MEA and DEA, “HSAS” represents the normal family of amine degradation
products
In MDEA “HSAS” refers to organic acid contaminants, mainly formate,
oxalate, and acetate