Well those pipes are a nice clue of what engineering will look like!
Are you really sure that the pipes are located in the U.S.S. Enterprise's engineering? Could they not also be part of Delta Vega's lithium cracking station or of the place Scotty was banished to?
I take everything back...
On trekmovie.com, it is written that
- Scotty [is] trapped inside water pipes on board the Enterprise after beaming on board from Delta Vega.
- Kirk [wears the] jacket had on when he and Scotty beamed in from Delta Vega.
- Kirk (now without jacket) [tries] to figure out how to get [Scotty] out of the Enterprise water pipes.
- [This] explains why [Scotty] appears wet when he utters his "I like this ship… it's exciting" line.
http://http://trekmovie.com/2009/03...ids-choice-awards-w-analysis-pine-appearance/