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| Introduction | Cost | Better than the rest | History |
| Why we are better than the rest |
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Spherical pig - no wiping edge to clean with - poor
cleaning ability. Heavy internal magnet. Rotating orientation
means detection never guaranteed. Cannot pass full-bore
openings. |
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Solid pig - single leading edge - smears trapped product
into sidewalls. Weak internal magnetic core - requires sensitive
and expensive detectors. Easily damaged by pipe imperfections. |
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Marplug – multiple windscreen wiper action enhances
removal of product from pipe walls. Tolerates pipe imperfections
and 1.5 D bends. Easily detected. |
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