There are also some other types of equipment with so many names that it is difficult to keep track of them. In the 1970’s, Shell proposed the first use of a converted oil tanker for producing oil, thus was born FLOATING PRODUCTION. Over the years, there have been many floating concepts using new and converted tankers, converted drilling rigs, new semi-submersibles, spars (a floating tube), tension leg platforms (does not really float but is tethered to the sea bed) and others. And the acronyms for all of these concepts are as numerous: FPS, FPV, FPSO, FSU, SPAR, TLP, et al.
Subsea Control Module & Subsea Electronics Module
Another piece of subsea equipment with multiple names are the elements of the control system. Originally the container which held the electronics and part of the hydraulics system was known as ‘a control pod’. At some point, that term fell out of favour and in came the subsea control module or SCM. But inside the SCM is the package of electronics, or the subsea electronics module, or SEM. So every SCM has an SEM, but not vice versa.