Debbie.....I am a little lost with a few Items
S10 and S11 appear two round pipe elements, not sure what they are ...could these be the two main engine exhaust transitions? however in real size they must be say 900mm diameter? ..........[copied image below may not be correct?]
Do these internally join to the plate F2?
S14, this appears I believe in other views as a smaller possibly 250mm real life diameter pipe with "Vitriolic" type clamps at angle sets
I could see this pipe being a Fire Water Ring Main?
The final color coding of the pipework will be interesting as is dependent on the Flag of Registry........
Sea water Ring Mains can be GREEN, or Fire Water Ring Mains are RED
Derek