Page 306 - Pipeline Risk Management Manual Ideas, Techniques, and Resources

Modeling ideas Ill 13/283
5.0 pts [Moderate Ground Movement Potentiall-Moderate 2.0 pts [Mild Atmospheric Conditions]-Mild corrosive
potential of one or more severe ground movement events atmospheric conditions exist
occurring during an average year with the potential to cause 6.0 pts [Moderate Atmospheric Conditions]-Moderate corro-
significant facility damage sive atmospheric conditions exist
10.0 pts [High Ground Movement Potentiall-High potential 10.0 pts [Severe Atmospheric Conditions]-Severe corrosive
of one or more severe ground movement events occurring atmospheric conditions exist
during an average year with the potential to cause significant
facility damage External corrosion susceptibility
5.0 pts [Unknown Ground Movement Potential]
[Facility Age]- Evaluation of station facilities (pumps, pip-
rrufic Dumugel- Evaluation of various hazardous traffic ing, vessels, equipment, and components) ages by recording
events, includmg moving object congestion, frequency, duration, the last facility installation or replacement date.
direction, mass, speed, and distance to facilities. The hazardous
event potential is determined by historical accident frequency, 0.0 pts [<I yr]-Very recent test (last facility installed?)
severity and damage caused by cars, trucks, rail cars, vessels, 2.0 pts [I-5 yrs]
andor plane impacts from within and outside the station. 6.0 pts [5-10 FS]
8.0pts [l(t-20 yrs]
0.0 pts mot Applicable] 8.0 pts [20-30 yrs]
2.0 pts [Low Traffic Damage Potentiall-Low potential of one 5.0 pts [UnknownAge]
or more hazardous traffic events occurring during an average
year with the potential to cause significant facility damage [Corrosive Ground Conditions]- Evaluation of various
5.0 pts [Moderate Traffic Damage Potentiall-Moderate ground corrosivity conditions, including soil resistivity, chlo-
potential of one or more hazardous traffic events occurring rides, pH, temperature, moisture level changes, chemicals,
during an average year with the potential to cause significant transition zone, etc.
facility damage
10.0 pts [HighTraffic Damage Potentiall-high potential ofone 0.0 pts [No Ground Conditions]-No corrosive ground condi-
or more hazardous traffic events occurring during an average tions exist
year with the potential to cause significant facility damage 2.0 pts [Mild Ground Conditions]-Mild corrosive ground
5.0 pts [UnknownTraffic Damage Potential] conditions exist
6.0 pts [Moderate Ground Conditions]-Moderate corrosive
[Activity Leveu- Evaluation of the overall station activity ground conditions exist
levels, including the frequency and duration of in-station exca- 10.0 pts [Severe Ground Conditions]-Severe corrosive
vations, facility modifications, and vehicle traffic. Controlled ground conditions exist
access, third-party facilities present, and continuous work
inspection are also evaluated. [Corrosive “Hot Spot” Conditions]- Evaluation of the pres-
ence and significance of CP interferences, including casings,
0.0 pts [Not Applicable] bundled piping, foreign line crossings, interference crossings,
2.0 pts [Low Activity Levell-Annual (average of liyr) haz- DCiAC stray currents.
ardous activities occur during an average year with the
potential to cause significant facility damage 0.0 pts [No “Hot Spot” Conditions]-No structures or stray
4.0 pts [Moderate Activity Level]-Monthly (average currents are present that could interfere with CP systems, or
limonth) hazardous activities occur during an average year create a corrosion hot spot, causing significant buried metal
with the potential to cause significant facility damage loss
7.0 pts [High Activity Levell-Weekly (average liwk) haz- 5.0 pts [Single “Hot Spot” Condition]-One type of structure
ardous activities occur during an average year with the or stray current is present that could interfere with CP sys-
potential to cause significant facility damage tems, or create a corrosion hot spot, causing significant
10.0 pts [Very High Activity Levell-Daily (average l/day) buried metal loss
hazardous activities occur during an average year with the 10.0 pts [Multiple “Hot Spot” Conditions]-Multiple struc-
potential to cause significant facility damage tures or stray currents are present that could interfere with
5.0 pts [Unknown Activity Level] CP systems, or create corrosion hot spots, causing signifi-
cant buried metal loss
Corrosion algorithm variables
Internal corrosion susceptibility
Atmospheric corrosion susceptibility
[Static Liquids Condition]- Evaluation of piping facilities
[Corrosive Atmospheric Conditions]- Evaluation of various where liquids are static, including piping dead-legs, pig traps
atmospheric corrosivity conditions, including contaminants, and out-of-service equipment. Also evaluate frequency, dura-
temperature, moisture, chemicals, splash zones, etc. tion, and product movements related to static conditions.
0.0 pts [No Atmospheric Conditions]-No corrosive atmos- 0.0 pts [No Static Conditions]-No corrosive static conditions
pheric conditions exist exist