The Vikings won`t waste time and resources on useless equipment.
I'm not saying this like "you dumbass, lol", I just love how you said it.
I'm going to have to agree with APDAF though. Despite their dubious usefullness, there were often at least two hull integrated torpedo tubes in WW1-era BBs. Even the Nelsons carried two, when they were finished at the end of the 20's. They can be removed later, but should at least be there at the start.
I really like the Sleipnir class. It reminds me of the German König class.