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

2.B-116 API RECOMMENDED PRACTICE 581
Table 2.B.14.9—Soil-Side Temperature Adjustment
Soil-Side Temperature
°C °F
Multiplying Factor—F ST
Temp ≤ 24 Temp ≤ 75 1.0
24 < Temp ≤ 66 75 < Temp ≤ 150 1.1
66 < Temp ≤ 93 150 < Temp ≤ 200 1.3
93 < Temp ≤ 121 200 < Temp ≤ 250 1.4
>121 >250 1.0
Table 2.B.14.10—Summary of Conditions for Product-Side Base Corrosion Rate
Factor
Internal coating
Bulk fluid temperature
Steam coil heater
Water draws
Base Corrosion Rate Conditions
Internal coating not needed for corrosion protection and none applied
Below 24 °C (75 °F)
No
No (water draws conducted neither weekly nor after every receipt)
Table 2.B.14.11—Product-Side Product Condition Adjustment
Product-Side Condition
Multiplying Factor—F PC
Wet 2.5
Dry 1.0
Table 2.B.14.12—Product-Side Temperature Adjustment
Product-Side Temperature
°C °F
Multiplying Factor—F PT
Temp ≤ 24 Temp ≤ 75 1.0
24 < Temp ≤ 66 75 < Temp ≤ 150 1.1
66 < Temp ≤ 93 150 < Temp ≤ 200 1.3
93 < Temp ≤ 121 200 < Temp ≤ 250 1.4
>121 >250 1.0
Table 2.B.14.13—Product-Side Steam Coil Adjustment
Steam Coil
Multiplying Factor—F SC
No 1.0
Yes 1.15