The phrase 'maintain as a' is grammatically correct but it is probably not something we would see in normal written English. It is not very clear what it means. It could be used, for example, in a sentence like this: "It is important to maintain an appropriate level of physical activity as a means of staying healthy.".
"We will replace them in sequence to ensure we maintain as a minimum the current pumping capacity.
If the Web functioned as its boosters maintain — as a "frictionless" source of information — then that posting would have been the end of things.
I guess there are probably a few hobbyists out there with some old-school apps that they maintain as a semi-commercial enterprise.
There is a minimum buffer that a bank is supposed to maintain as a safeguard against some of its loans going bad.
The property is now maintained as a museum.
On Sheffield Island they will see the 19th-century lighthouse maintained as a museum by the Norwalk Seaport Association.
It was not meant, he maintained, as a literal endorsement of Assad's position.
Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.
Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com