Page 23 - Pipeline Pigging Technology
P. 23
Pipeline Pigging Technology
Fig.l. Typical types of pig.
As new tools and techniques are developed, the above list is expanding,
and has come to include self-propelled and tethered devices such as piggable
barrier valves and pressure-resisting plugs.
The following paragraphs consider a pipeline from construction through
to operation and maintenance, looking at possible requirements for pigging.
4
