We have for some time now been discussing whether we should use gas pressurization - in this case argon gas,  or turbopumps for the fuel feed system to the engine.
In the current situation,the fuel tanks  is designed to withstand internal working  pressure by using gas pressurizing. But we consider to switching over completely to use turbo pumps instead due to several different reasons.

Helium gas, which is the most common type of gas to use for rockets is extremely expensive, and is also the most expensive component in project.
Nitrogen gas is significantly cheaper but more inefficient than helium is. And in addition to the gas, it takes a great many meters of tubing, connectors, and a variety of regulators in order to have control over it.

But if you can use  turbo pumps instead and still get the same result you can avoid expensive disposable gas which becomes of it, heavy regulators, etc.

Turbopumps are also relatively cheap to have in service.There are many ways to run a turbopump on, either you can use a engine, or in our case of a steam turbine.
By using 80-93%  pure hydrogen peroxide you can get the unbelievable amounts of steam to power a turbine which in turn powers the pumps.

Shaft and impeller

Some equipment for
purifying hydrogen peroxide up to 80-93%