The helium pumps supplied purified helium to the reaction process via a pair of double-acting diaphragm pumps. Helium was passed across the top of the heavy water inside the reactor tank, collecting water vapour and preventing corrosion which would otherwise introduce contamination.
The cubed arrangement to the front right is a pulsation dampener that takes the shocks out of the pressure generated by the diaphragm pumps and creates an even helium flow.
The tank in the back right is a stainless steel expansion vessel. It serves the purpose of absorbing the pressure if an explosion occurs in the reactor tank preventing a rupture of the reactor block.
Helium Pumps is part of the Lost Collective 'ANSTO HIFAR' series.