their heat transfer areas will become ineffective and the ice layers must be removed by defrosting the defrosting cycle time depends on the ambient humidity conditions and the defrosting method condensate water stream 6 removed from the ambient air vaporizers during the defrosting cycle is of condensate quality which can be used as boiler feed water makeup the partially heated and vaporized lng stream 3 is then further heated in exchanger 53 using a heat transfer fluid 33 to about 36 u00b0 f forming natural gas stream 4 to the pipeline most preferably the heat transfer fluid circuit is heated with waste heat from at least two different sources from the bfw recirculating circuit and from the condensing steam turbine discharge for example and as shown in fig1 the heat transfer fluid stream 30 from the trim heater 53 is pumped by pump 65 forming stream 31 which is heated by the hot bfw stream 16 in heat exchanger 58 to about 80 u00b0 f to 100 u00b0 f forming stream 32 which is further heated in exchanger 56 using the steam turbine discharge stream 23 forming the heated stream 33 at 80 u00b0 f to 120 u00b0 f that is recirculated supplying heat to the trim heater 53 gas turbine exhaust stream 7 at about 1000 u00b0 f is used to produce high pressure steam stream 22 at 600 psig and 750 u00b0 f from the waste heat recovery steam generation hrsg 54 the temperature of the high pressure steam is controlled by control valve 61 maintaining an optimum temperature that meets heating requirements by the heat transfer fluid for lng heating and the steam requirement for power generation the high pressure steam.