A gas liquification system comprising: a refrigerant in the form of a liquid refrigerant and a refrigerant gas; a first core tank retaining a portion of the liquid refrigerant and a portion of the refrigerant gas; a second core tank retaining a portion of the liquid refrigerant and a portion of the refrigerant gas; a low pressure tank retaining a portion of the refrigerant gas; a high pressure tank retaining a portion of the refrigerant gas at a pressure higher than the pressure within the low pressure tank; a compressing device in communication with the high pressure tank and the low pressure tank, the compressing device receiving refrigerant gas from the low pressure tank and delivering it to the high pressure tank under increased pressure; a gas source providing a compressed gas to be liquified; a first condensing tube within the first core tank and extending through the liquid refrigerant retained within the first core tank, and a second condensing tube within the second core tank and extending through the liquid refrigerant retained within the second core tank; the first and second condensing tubes (35, 36) receiving the compressed gas to be liquified from the gas source; a first liquid delivery tube positioned within the first core tank and extending into the liquid refrigerant retained within the first core tank and a second expansion device disposed on the second core tank, such that liquid refrigerant from the first core tank is delivered into the second core tank from the first liquid delivery tube to the second expansion device, the second expansion device enabling a portion of the liquid refrigerant delivered from the first core tank to vaporize into refrigerant gas; a second liquid delivery tube positioned within the second core tank and extending into the liquid refrigerant retained within the second core tank and a first expansion device disposed on the first core tank, such that liquid refrigerant from the second core tank is delivered into the first core tank from the second liquid delivery tube to the first expansion device, the first expansion device enabling a portion of the liquid refrigerant delivered from the second core tank to vaporize into refrigerant gas; a routing system wherein in a first operational condition the refrigerant gas from the high pressure tank is routed to the first core tank to increase the pressure within the first core tank and refrigerant gas within the second core tank is routed to the low pressure tank, and wherein in a second operational condition the refrigerant gas from the high pressure tank is routed to the second core tank to increase the pressure within the second core tank and refrigerant gas within the first core tank is routed to the low pressure tank; and a heat exchanger disposed between the compressing device and the high pressure tank. a refrigerant in the form of a liquid refrigerant and a refrigerant gas; a first core tank retaining a portion of the liquid refrigerant and a portion of the refrigerant gas; a second core tank retaining a portion of the liquid refrigerant and a portion of the refrigerant gas; a low pressure tank retaining a portion of the refrigerant gas; a high pressure tank retaining a portion of the refrigerant gas at a pressure higher than the pressure within the low pressure tank; a compressing device in communication with the high pressure tank and the low pressure tank, the compressing device receiving refrigerant gas from the low pressure tank and delivering it to the high pressure tank under increased pressure; a gas source providing a compressed gas to be liquified; a first condensing tube within the first core tank and extending through the liquid refrigerant retained within the first core tank, and a second condensing tube within the second core tank and extending through the liquid refrigerant retained within the second core tank; the first and second condensing tubes (35, 36) receiving the compressed gas to be liquified from the gas source; a first liquid delivery tube positioned within the first core tank and extending into the liquid refrigerant retained within the first core tank and a second expansion device disposed on the second core tank, such that liquid refrigerant from the first core tank is delivered into the second core tank from the first liquid delivery tube to the second expansion device, the second expansion device enabling a portion of the liquid refrigerant delivered from the first core tank to vaporize into refrigerant gas; a second liquid delivery tube positioned within the second core tank and extending into the liquid refrigerant retained within the second core tank and a first expansion device disposed on the first core tank, such that liquid refrigerant from the second core tank is delivered into the first core tank from the second liquid delivery tube to the first expansion device, the first expansion device enabling a portion of the liquid refrigerant delivered from the second core tank to vaporize into refrigerant gas; a routing system wherein in a first operational condition the refrigerant gas from the high pressure tank is routed to the first core tank to increase the pressure within the first core tank and refrigerant gas within the second core tank is routed to the low pressure tank, and wherein in a second operational condition the refrigerant gas from the high pressure tank is routed to the second core tank to increase the pressure within the second core tank and refrigerant gas within the first core tank is routed to the low pressure tank; and