One of the little ships I worked on had Vivian main engines. Underpowered, oversized and sounded like a sewing machine when they were running. It had to be the most boring ship I ever worked on and I was extremely delighted to get off. The Chief Engineer insisted on the LO temperatures (all manually adjusted) being kept fairly low. That way the oil leaks were minimized and the engines always looked pristine. LOL
They had a teapot for a boiler, if I remember correctly. It might have run at 30 psi.
I was so bored, I erased most of that ship out of my memory pretty quick, definitely a retirement job. A 4 hour watch was like 12 hours.