1) Do wrinkle bends exist in your pipeline system and to what extent
None Few (less than 50) Many (more than 50)
2) How many wrinkle bends have been positively identified in the pipeline (Either by in-line inspection or digging) in the past 5 years?
None 1 - 10 bends 11 - 25 bends 26 - 50 bends 51 - 75 bends 76 - 100 bends More than 100 bends
3) If you answered YES to question 2, how was fitness-for-service of the wrinkle bends determined? Please describe the general approach(s) used.
4) How many failures have occurred due to wrinkle bends or in the vicinity (1 pipe diameter) of the wrinkle bend in past 5 years? (A failure is defined as a leak or rupture)
None 1 - 10 failures 11 - 25 failures 26 - 50 failures 51 - 75 failures 76 - 100 failures More than 100 failures
5) Of the wrinkle bend failures that have occurred, what percent are associated with corrosion, dents, girth/seam welds, or any other geometric anomalies?
Not Applicable Never Rarely Frequently Always
6) Does your company have a maintenance inspection protocol for wrinkle bends?
7) If you answered YES to the above question, how many wrinkle bends have been inspected in the last 12 months?
None 1 - 5 bends 6 - 19 bends 11 - 25 bends More than 25 bends
8) How many wrinkle bends were cut out and removed by your company in the last 5 years?
None 1 - 5 wrinkle bends 6 - 19 wrinkle bends 11 - 25 wrinkle bends More than 25 wrinkle bends
9) If you answered YES to the above question, why were the wrinkle bends removed?
None Corrosion leak Dents Rupture Soil movement Fatigue
10) If you answered YES to question #8, how were the failure mechanism(s) of the wrinkle bends determined? Please describe the general approach(s) used.
11) At what percent of SMYS do the pipelines having wrinkle bends operate?
None Less than 30% 30-50% 50-72%
12) What primary product is transported in your pipeline system?
13) How many miles of pipeline are in your system?
None Less than 500 miles 500 to 1,000 miles 1,000 to 5,000 miles More than 5,000 miles
14) In what regions of the world are your pipelines located (check all that apply)?
15) Is your pipeline system primarily transmission or distribution?
16) In what years were the pipelines having wrinkle bends built (if multiple years, select the oldest period of time)?
Before 1930 1930 to 1940 1940 to 1950 1960 to 1960 1960 to 1970 After 1970
17) In your pipeline system, what grade of pipe is typical for those lines having wrinkle bends (if multiple, choose the lowest grade)?
18) In your pipeline system, what is the typical diameter to wall thickness ratio (D/t) for pipelines having wrinkle bends (if multiple, choose the largest D/t pipe)?
None Less than 25 25 to 50 50 to 75 75 to 100 Greater than 100
19) Approximately, what number of pressure cycles does a typical wrinkle bend in your system experience in a year?
Between 0-10 Between 10-100 Between 100-1000 Between 1000-5000 Between 5000-10,000 More than 10,000
20) Does your company undertake repair or reinforcement of wrinkle bends besides cut-outs?
21) Does your company assess the wrinkle bends subject to any known pipeline movements?
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