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A heat exchanger for heat exchange between a working fluid and a coolant having an inner casing, an outer casing, and an annular space formed therebetween. A tube bundle including at least one tube formed into a helical coil is located within the annular space. End plates are removably secured and s

A heat exchanger for heat exchange between a working fluid and a coolant having an inner casing, an outer casing, and an annular space formed therebetween. A tube bundle including at least one tube formed into a helical coil is located within the annular space. End plates are removably secured and sealed to the ends of the outer casing. Bulkhead fittings are mounted in openings of the end plates to seal the tube ends which pass through the end plates. The bulkhead fittings are sized to permit the end plates to be moved off of the bulkhead fittings in a direction away from the helical coil. The tube bundle may also include a separating plate extending longitudinally between the coils of two tubes within the tube bundle creating two separate passages through which coolant may flow. External tubes may be connected at the tube ends, outside of the outer casing and the end plates, such that the working fluid flows in a parallel single-pass flow or a series double-pass flow through the annular space. A method for servicing the heat exchanger includes disconnecting the heat exchanger from a fluid delivery tube and a fluid return tube, removing the end plates off of the bulkhead fittings in a direction away from the helical coil, removing the inner and outer casings off of the tube bundle, and servicing the tube bundle.

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[ We claim:] [1.] A method for servicing a heat exchanger that is connected to a fluid delivery tube for receiving working fluid from a working fluid source and connected to a fluid return tube for returning working fluid to the working fluid source, wherein the heat exchanger includes:an inner casi

[ We claim:] [1.] A method for servicing a heat exchanger that is connected to a fluid delivery tube for receiving working fluid from a working fluid source and connected to a fluid return tube for returning working fluid to the working fluid source, wherein the heat exchanger includes:an inner casing;an outer casing around the inner casing forming an annular space therebetween, the outer casing having a first end and a second end;a tube bundle including a first tube through which one of said working fluid and coolant flows, the first tube having a first end, a second end and a helical coil formed between the first and second ends of the first tube, wherein the helical coil is located in the annular space between the inner and outer casings;a first end plate removably secured and sealed to the first end of the outer casing, the first end plate having an opening through which the first end of the first tube passes;a second end plate removably secured and sealed to the second end of the outer casing, the second end plate having an opening through which the second end of the first tube passes;a first bulkhead fitting detachably mounted in the opening of the first end plate, the first bulkhead fitting sealed to the first end of the first tube passing therethrough; anda second bulkhead fitting detachably mounted in the opening of the second end plate, the second bulkhead fitting sealed to the second end of the first tube passing therethrough;wherein the first and second bulkhead fittings are sized to permit the first and second end plates, respectively to be moved off of the respective bulkhead fittings in a direction away from the helical coil,wherein the servicing method comprises:disconnecting the heat exchanger from the fluid delivery tube and the fluid return tube;removing the first and second end plates off of the respective bulkhead fittings in a direction away from the helical coil;removing the inner and outer casings off of the tube bundle.