multiphase fluid for example fluid from a well head is directed to the apparatus by a conduit 50 check valve 51 and conduit 52 the mixture of liquid and gas enters a fluid treatment device 55 the fluid treatment device may be a slug suppressor or a known atomizing device such as one or more atomizing nozzles or a flow mixer it may also be a combination of these elements an example of a combined slug suppressor and atomizing device is shown in fig4 liquid accumulates in inner chamber 107 and gas flows in outer chamber 108 baffles 104 are provided in the walls of inner chamber 107 to allow for sudden increases in liquid to spill over into the gas stream and mix with the gas thus a sudden increase in liquid flow is slowed down by using some of the gas still in the slug suppressor to reduce the liquid volume atomizing nozzles 105 at the lower end of the liquid chamber atomize the liquid and spray it into the gas flow downstream of a tapered portion 109 of the gas flow path the atomized liquid and gas streams continue to flow through conduit portion 106 a typical slug suppressor and atomizing device is available from framo engineering as a flow mixer may include counter swirling vanes or counter rotating vortices referring again to fig2 the mixture leaving the fluid treatment device 55 flows through conduit 56 to compressor 58 compressed fluid leaves compressor 58 through conduit 60 and 61 to check valve 62 and to a distribution conduit 63 which delivers the compressed fluid to a desired.