Its not easy to look into 200 miles of pipe, to decide whether it is clean or not. Even if pigs have been run, are they doing their job.
- Is the pig design correct ?
- How clean is the pipe?
- Is the pig running at optimal cleaning speed
- Should more than one pig be run?
- How often should they be run?
If too many deposits are removed at once, the line may become blocked. It is therefore important that pigging operations are managed properly and as much data as possible assembled prior to undertaking a pig run.