Hi Giampiero
I thought this was going to be an easy one, but when I looked in the excellent "50 years of Naval Tugs" by Bill Hannan, there was only one tug mentioned as being based at Scapa!
She was Empire Teak, coal fired, 106feet 6 inches long 243 GRT, completed in 1942 by R Dunston of Thorne.
However, there were a number of other tugs which were listed as being attached to the Home Fleet (very often for target towing as well as harbour work) which may well have been based at Scapa at some time or another.
From the Saint class there was St Cyrus, St Just (but only to 1939) and probably St Mabyn and St Olaves as well.
Bandit and Buccaneer of the Brigand class were attached to the Home Fleet as well.
Based at Rosyth, and therefore possible visitors to Scapa were Buckie Burn of the Burn class and Flamer, Handmaid and Impetus of the Flamer class.
It is likely that the large rescue tugs appeared at Scapa from time to time (although they would not have been used for harbour work) so this would have included the Assurance class tugs and the Bustler class. Also the small wartime TID tugs were used all over the place and as over 80 of them had some naval service it is highly likely some of them found their way to Scapa.
I can help with drawings of Saint class and Assurance class and TID tugs if you PM me.
The steam tug Cervia is preserved at Ramsgate and was originally built as Empire Raymond and would have been similar in appearance to Empire Teak. This is a photo of a model of her in the Ramsgate Harbour Museum.
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File comment: Cervia (ex-Empire Raymond)
Cerviamodelsmall.jpg [ 120.31 KiB | Viewed 4074 times ]
TID 164 is preserved at Chatham
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File comment: TID 164
TID164Chatham10small.jpg [ 95.01 KiB | Viewed 4074 times ]
Hope this helps
Don